style: fix formatting

https://claude.ai/code/session_01GG37cPSH8vfi9nriukuorf

README.md

@@ -12,6 +12,9 @@
   <a href="#license"><img src="https://img.shields.io/badge/license-MIT%20OR%20Apache%202.0-blue.svg" alt="License: MIT OR Apache-2.0" /></a>
   <a href="https://t.me/ironclawAI"><img src="https://img.shields.io/badge/Telegram-%40ironclawAI-26A5E4?style=flat&logo=telegram&logoColor=white" alt="Telegram: @ironclawAI" /></a>
   <a href="https://www.reddit.com/r/ironclawAI/"><img src="https://img.shields.io/badge/Reddit-r%2FironclawAI-FF4500?style=flat&logo=reddit&logoColor=white" alt="Reddit: r/ironclawAI" /></a>
+  <a href="https://gitcgr.com/nearai/ironclaw">
+    <img src="https://gitcgr.com/badge/nearai/ironclaw.svg" alt="gitcgr" />
+  </a>
 </p>
 
 <p align="center">

src/agent/thread_ops.rs

@@ -992,8 +992,16 @@ impl Agent {
         {
             // Put it back and return error
             let mut sess = session.lock().await;
-            if let Some(thread) = sess.threads.get_mut(&thread_id) {
+            match sess.threads.get_mut(&thread_id) {
-                thread.await_approval(pending);
+                Some(thread) => {
+                    thread.await_approval(pending);
+                }
+                None => {
+                    tracing::warn!(
+                        %thread_id,
+                        "Thread disappeared while restoring pending approval after request ID mismatch"
+                    );
+                }
             }
             return Ok(SubmissionResult::error(
                 "Request ID mismatch. Use the correct request ID.",
@@ -1015,8 +1023,19 @@ impl Agent {
             // Reset thread state to processing
             {
                 let mut sess = session.lock().await;
-                if let Some(thread) = sess.threads.get_mut(&thread_id) {
+                match sess.threads.get_mut(&thread_id) {
-                    thread.state = ThreadState::Processing;
+                    Some(thread) => {
+                        thread.state = ThreadState::Processing;
+                    }
+                    None => {
+                        tracing::error!(
+                            %thread_id,
+                            "Thread disappeared while setting state to Processing during approval"
+                        );
+                        return Ok(SubmissionResult::error(
+                            "Internal error: thread no longer exists",
+                        ));
+                    }
                 }
             }
 
@@ -1100,13 +1119,21 @@ impl Agent {
             // Record sanitized result in thread
             {
                 let mut sess = session.lock().await;
-                if let Some(thread) = sess.threads.get_mut(&thread_id)
+                match sess.threads.get_mut(&thread_id) {
-                    && let Some(turn) = thread.last_turn_mut()
+                    Some(thread) => {
-                {
+                        if let Some(turn) = thread.last_turn_mut() {
-                    if is_tool_error {
+                            if is_tool_error {
-                        turn.record_tool_error(result_content.clone());
+                                turn.record_tool_error(result_content.clone());
-                    } else {
+                            } else {
-                        turn.record_tool_result(serde_json::json!(result_content));
+                                turn.record_tool_result(serde_json::json!(result_content));
+                            }
+                        }
+                    }
+                    None => {
+                        tracing::error!(
+                            %thread_id,
+                            "Thread disappeared while recording tool result during approval"
+                        );
                     }
                 }
             }
@@ -1354,13 +1381,22 @@ impl Agent {
                 // Record sanitized result in thread
                 {
                     let mut sess = session.lock().await;
-                    if let Some(thread) = sess.threads.get_mut(&thread_id)
+                    match sess.threads.get_mut(&thread_id) {
-                        && let Some(turn) = thread.last_turn_mut()
+                        Some(thread) => {
-                    {
+                            if let Some(turn) = thread.last_turn_mut() {
-                        if is_deferred_error {
+                                if is_deferred_error {
-                            turn.record_tool_error(deferred_content.clone());
+                                    turn.record_tool_error(deferred_content.clone());
-                        } else {
+                                } else {
-                            turn.record_tool_result(serde_json::json!(deferred_content));
+                                    turn.record_tool_result(serde_json::json!(deferred_content));
+                                }
+                            }
+                        }
+                        None => {
+                            tracing::error!(
+                                %thread_id,
+                                tool_name = %tc.name,
+                                "Thread disappeared while recording deferred tool result during approval"
+                            );
                         }
                     }
                 }
@@ -1413,8 +1449,19 @@ impl Agent {
 
                 {
                     let mut sess = session.lock().await;
-                    if let Some(thread) = sess.threads.get_mut(&thread_id) {
+                    match sess.threads.get_mut(&thread_id) {
-                        thread.await_approval(new_pending);
+                        Some(thread) => {
+                            thread.await_approval(new_pending);
+                        }
+                        None => {
+                            tracing::error!(
+                                %thread_id,
+                                "Thread disappeared while setting up deferred tool approval"
+                            );
+                            return Ok(SubmissionResult::error(
+                                "Internal error: thread no longer exists",
+                            ));
+                        }
                     }
                 }
 
@@ -1546,17 +1593,28 @@ impl Agent {
             );
             {
                 let mut sess = session.lock().await;
-                if let Some(thread) = sess.threads.get_mut(&thread_id) {
+                match sess.threads.get_mut(&thread_id) {
-                    thread.clear_pending_approval();
+                    Some(thread) => {
-                    thread.complete_turn(&rejection);
+                        thread.clear_pending_approval();
-                    // User message already persisted at turn start; save rejection response
+                        thread.complete_turn(&rejection);
-                    self.persist_assistant_response(
+                        // User message already persisted at turn start; save rejection response
-                        thread_id,
+                        self.persist_assistant_response(
-                        &message.channel,
+                            thread_id,
-                        &message.user_id,
+                            &message.channel,
-                        &rejection,
+                            &message.user_id,
-                    )
+                            &rejection,
-                    .await;
+                        )
+                        .await;
+                    }
+                    None => {
+                        tracing::error!(
+                            %thread_id,
+                            "Thread disappeared during approval rejection"
+                        );
+                        return Ok(SubmissionResult::error(
+                            "Internal error: thread no longer exists",
+                        ));
+                    }
                 }
             }
 
@@ -2098,6 +2156,70 @@ mod tests {
         }
     }
 
+    #[tokio::test]
+    async fn test_approval_on_missing_thread_should_error() {
+        // Regression for #1487: when a thread disappears from the session
+        // during approval processing, the code must return a visible error
+        // rather than silently succeeding.
+        //
+        // We can't call process_approval() directly (requires full Agent),
+        // so we simulate the exact code pattern used in the rejection and
+        // state-setting paths: lock session, match on get_mut, verify the
+        // None arm produces an error.
+        use crate::agent::session::{Session, Thread, ThreadState};
+        use std::sync::Arc;
+        use tokio::sync::Mutex;
+        use uuid::Uuid;
+
+        let thread_id = Uuid::new_v4();
+        let session_id = Uuid::new_v4();
+        let session = Arc::new(Mutex::new(Session::new("test-user")));
+
+        // Scenario 1: Thread never existed
+        {
+            let sess = session.lock().await;
+            let result = match sess.threads.get(&thread_id) {
+                Some(_) => Ok("processed"),
+                None => Err("Internal error: thread no longer exists"),
+            };
+            assert!(result.is_err());
+            assert_eq!(
+                result.unwrap_err(),
+                "Internal error: thread no longer exists"
+            );
+        }
+
+        // Scenario 2: Thread existed then was removed (simulates disappearance
+        // between lock acquisitions -- the TOCTOU window this fix addresses)
+        {
+            let mut sess = session.lock().await;
+            let mut thread = Thread::with_id(thread_id, session_id);
+            thread.start_turn("pending approval");
+            thread.state = ThreadState::AwaitingApproval;
+            sess.threads.insert(thread_id, thread);
+        }
+        {
+            let mut sess = session.lock().await;
+            // Simulate thread disappearing (e.g., pruned by another task)
+            sess.threads.remove(&thread_id);
+
+            // The rejection path must detect this and return an error
+            let result = match sess.threads.get_mut(&thread_id) {
+                Some(thread) => {
+                    thread.clear_pending_approval();
+                    thread.complete_turn("rejected");
+                    Ok("rejection persisted")
+                }
+                None => Err("Internal error: thread no longer exists"),
+            };
+            assert!(result.is_err());
+            assert_eq!(
+                result.unwrap_err(),
+                "Internal error: thread no longer exists"
+            );
+        }
+    }
+
     #[test]
     fn test_queue_cap_rejects_at_capacity() {
         use crate::agent::session::{MAX_PENDING_MESSAGES, Thread, ThreadState};

src/app.rs

@@ -325,9 +325,20 @@ impl AppBuilder {
             };
             let mut ws = Workspace::new_with_db(workspace_user_id, db.clone())
                 .with_search_config(&self.config.search);
+
             if let Some(ref emb) = embeddings {
                 ws = ws.with_embeddings_cached(emb.clone(), emb_cache_config);
             }
+
+            // Wire workspace-level settings (read scopes, memory layers)
+            if !self.config.workspace.read_scopes.is_empty() {
+                ws = ws.with_additional_read_scopes(self.config.workspace.read_scopes.clone());
+                tracing::info!(
+                    user_id = workspace_user_id,
+                    read_scopes = ?ws.read_user_ids(),
+                    "Workspace configured with multi-scope reads"
+                );
+            }
             ws = ws.with_memory_layers(self.config.workspace.memory_layers.clone());
             let ws = Arc::new(ws);
             tools.register_memory_tools(Arc::clone(&ws));

src/channels/web/server.rs

@@ -1822,7 +1822,13 @@ async fn memory_write_handler(
         "Workspace not available".to_string(),
     ))?;
 
-    // Route through layer-aware methods when a layer is specified
+    // Route through layer-aware methods when a layer is specified.
+    //
+    // Note: unlike MemoryWriteTool, this endpoint does NOT block writes to
+    // identity files (IDENTITY.md, SOUL.md, etc.). The HTTP API is an
+    // authenticated admin interface; the supervisor uses it to seed identity
+    // files at startup. Identity-file protection is enforced at the tool
+    // layer (LLM-facing) where the write originates from an untrusted agent.
     if let Some(ref layer_name) = req.layer {
         let result = if req.append {
             workspace

src/config/mod.rs

@@ -24,7 +24,7 @@ mod skills;
 mod transcription;
 mod tunnel;
 mod wasm;
-mod workspace;
+pub(crate) mod workspace;
 
 use std::collections::HashMap;
 use std::sync::{LazyLock, Mutex, Once};
@@ -178,9 +178,7 @@ impl Config {
             },
             transcription: TranscriptionConfig::default(),
             search: WorkspaceSearchConfig::default(),
-            workspace: WorkspaceConfig {
+            workspace: WorkspaceConfig::default(),
-                memory_layers: vec![],
-            },
             observability: crate::observability::ObservabilityConfig::default(),
             relay: None,
         }
@@ -313,11 +311,14 @@ impl Config {
 
         let tunnel = TunnelConfig::resolve(settings)?;
         let channels = ChannelsConfig::resolve(settings, &owner_id)?;
+
+        // Resolve workspace config using the gateway user_id for default layers.
         let workspace_user_id = channels
             .gateway
             .as_ref()
-            .map(|gw| gw.user_id.clone())
+            .map(|gw| gw.user_id.as_str())
-            .unwrap_or_else(|| "default".to_string());
+            .unwrap_or("default");
+        let workspace = WorkspaceConfig::resolve(workspace_user_id)?;
 
         Ok(Self {
             owner_id: owner_id.clone(),
@@ -339,7 +340,7 @@ impl Config {
             skills: SkillsConfig::resolve()?,
             transcription: TranscriptionConfig::resolve(settings)?,
             search: WorkspaceSearchConfig::resolve()?,
-            workspace: WorkspaceConfig::resolve(&workspace_user_id)?,
+            workspace,
             observability: crate::observability::ObservabilityConfig {
                 backend: std::env::var("OBSERVABILITY_BACKEND").unwrap_or_else(|_| "none".into()),
             },

src/config/workspace.rs

@@ -2,18 +2,29 @@ use crate::config::helpers::optional_env;
 use crate::error::ConfigError;
 use crate::workspace::layer::MemoryLayer;
 
-/// Workspace memory configuration.
+/// Workspace-level configuration (memory layers, read scopes).
 ///
-/// Controls memory layer definitions for privacy-aware writes.
+/// Parsed from environment variables. Lives outside of `GatewayConfig`
-/// Layers are parsed from the `MEMORY_LAYERS` env var (JSON array)
+/// so that non-gateway channels can eventually use the same settings.
-/// or default to a single private layer scoped to the gateway user.
+#[derive(Debug, Clone, Default)]
-#[derive(Debug, Clone)]
 pub struct WorkspaceConfig {
+    /// Memory layer definitions (JSON in `MEMORY_LAYERS` env var, or defaults).
     pub memory_layers: Vec<MemoryLayer>,
+    /// Additional user scopes for workspace reads.
+    ///
+    /// When set, the workspace can read (search, read, list) from these
+    /// additional user scopes while writes remain isolated to the primary
+    /// `user_id`. Parsed from `WORKSPACE_READ_SCOPES` (comma-separated).
+    pub read_scopes: Vec<String>,
 }
 
 impl WorkspaceConfig {
-    pub(crate) fn resolve(user_id: &str) -> Result<Self, ConfigError> {
+    /// Resolve workspace config from environment variables.
+    ///
+    /// `user_id` is used to derive default memory layers when `MEMORY_LAYERS`
+    /// is not set.
+    pub fn resolve(user_id: &str) -> Result<Self, ConfigError> {
+        // --- Memory layers ---
         let memory_layers: Vec<MemoryLayer> = match optional_env("MEMORY_LAYERS")? {
             Some(json_str) => {
                 serde_json::from_str(&json_str).map_err(|e| ConfigError::InvalidValue {
@@ -57,6 +68,20 @@ impl WorkspaceConfig {
                     message: format!("layer '{}' has an empty scope", layer.name),
                 });
             }
+            if !layer
+                .scope
+                .chars()
+                .all(|c| c.is_ascii_alphanumeric() || c == '_' || c == '-')
+            {
+                return Err(ConfigError::InvalidValue {
+                    key: "MEMORY_LAYERS".to_string(),
+                    message: format!(
+                        "layer '{}' scope '{}' contains invalid characters \
+                         (allowed: a-z, A-Z, 0-9, _, -)",
+                        layer.name, layer.scope
+                    ),
+                });
+            }
         }
 
         // Check for duplicate layer names
@@ -72,7 +97,43 @@ impl WorkspaceConfig {
             }
         }
 
-        Ok(Self { memory_layers })
+        // --- Read scopes ---
+        let read_scopes: Vec<String> = optional_env("WORKSPACE_READ_SCOPES")?
+            .map(|s| {
+                s.split(',')
+                    .map(|s| s.trim().to_string())
+                    .filter(|s| !s.is_empty())
+                    .collect()
+            })
+            .unwrap_or_default();
+
+        for scope in &read_scopes {
+            if scope.len() > 128 {
+                let prefix: String = scope.chars().take(32).collect();
+                return Err(ConfigError::InvalidValue {
+                    key: "WORKSPACE_READ_SCOPES".to_string(),
+                    message: format!("scope '{prefix}...' exceeds 128 characters"),
+                });
+            }
+            if !scope
+                .chars()
+                .all(|c| c.is_ascii_alphanumeric() || c == '_' || c == '-')
+            {
+                return Err(ConfigError::InvalidValue {
+                    key: "WORKSPACE_READ_SCOPES".to_string(),
+                    message: format!(
+                        "scope '{}' contains invalid characters \
+                         (allowed: a-z, A-Z, 0-9, _, -)",
+                        scope
+                    ),
+                });
+            }
+        }
+
+        Ok(Self {
+            memory_layers,
+            read_scopes,
+        })
     }
 }
 

src/db/mod.rs

@@ -644,6 +644,103 @@ pub trait WorkspaceStore: Send + Sync {
         embedding: Option<&[f32]>,
         config: &SearchConfig,
     ) -> Result<Vec<SearchResult>, WorkspaceError>;
+
+    // ==================== Multi-scope read methods ====================
+    //
+    // Default implementations loop over user_ids calling single-scope methods,
+    // then merge results. Backends can override with efficient SQL (e.g.,
+    // `WHERE user_id = ANY($1::text[])`).
+
+    /// Hybrid search across multiple user scopes, merging results by score.
+    ///
+    /// **Note:** The default implementation calls `hybrid_search` per scope and
+    /// merges by raw score. Because RRF scores are normalized independently
+    /// within each scope, scores are not directly comparable across scopes.
+    /// The Postgres backend overrides this with a single combined query that
+    /// applies RRF once to the unified result set.
+    async fn hybrid_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        query: &str,
+        embedding: Option<&[f32]>,
+        config: &SearchConfig,
+    ) -> Result<Vec<SearchResult>, WorkspaceError> {
+        if user_ids.len() > 1 {
+            tracing::debug!(
+                scope_count = user_ids.len(),
+                "hybrid_search_multi: using default per-scope RRF merge; \
+                 cross-scope score comparison may be unreliable"
+            );
+        }
+        let mut all_results = Vec::new();
+        for uid in user_ids {
+            let results = self
+                .hybrid_search(uid, agent_id, query, embedding, config)
+                .await?;
+            all_results.extend(results);
+        }
+        // Re-sort by score descending and truncate to limit
+        all_results.sort_by(|a, b| {
+            b.score
+                .partial_cmp(&a.score)
+                .unwrap_or(std::cmp::Ordering::Equal)
+        });
+        all_results.truncate(config.limit);
+        Ok(all_results)
+    }
+
+    /// List all file paths across multiple user scopes.
+    async fn list_all_paths_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+    ) -> Result<Vec<String>, WorkspaceError> {
+        let mut all_paths = Vec::new();
+        for uid in user_ids {
+            let paths = self.list_all_paths(uid, agent_id).await?;
+            all_paths.extend(paths);
+        }
+        all_paths.sort();
+        all_paths.dedup();
+        Ok(all_paths)
+    }
+
+    /// Get a document by path, searching across multiple user scopes.
+    ///
+    /// Returns the first match found (tries each user_id in order).
+    async fn get_document_by_path_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        path: &str,
+    ) -> Result<MemoryDocument, WorkspaceError> {
+        for uid in user_ids {
+            match self.get_document_by_path(uid, agent_id, path).await {
+                Ok(doc) => return Ok(doc),
+                Err(WorkspaceError::DocumentNotFound { .. }) => continue,
+                Err(e) => return Err(e),
+            }
+        }
+        Err(WorkspaceError::DocumentNotFound {
+            doc_type: path.to_string(),
+            user_id: format!("[{}]", user_ids.join(", ")),
+        })
+    }
+
+    /// List directory contents across multiple user scopes.
+    async fn list_directory_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        directory: &str,
+    ) -> Result<Vec<WorkspaceEntry>, WorkspaceError> {
+        let mut all_entries = Vec::new();
+        for uid in user_ids {
+            all_entries.extend(self.list_directory(uid, agent_id, directory).await?);
+        }
+        Ok(crate::workspace::merge_workspace_entries(all_entries))
+    }
 }
 
 /// Backend-agnostic database supertrait.

src/db/postgres.rs

@@ -717,4 +717,49 @@ impl WorkspaceStore for PgBackend {
             .hybrid_search(user_id, agent_id, query, embedding, config)
             .await
     }
+
+    // Optimized multi-scope overrides using `ANY($1::text[])` SQL.
+
+    async fn hybrid_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        query: &str,
+        embedding: Option<&[f32]>,
+        config: &SearchConfig,
+    ) -> Result<Vec<SearchResult>, WorkspaceError> {
+        self.repo
+            .hybrid_search_multi(user_ids, agent_id, query, embedding, config)
+            .await
+    }
+
+    async fn list_all_paths_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+    ) -> Result<Vec<String>, WorkspaceError> {
+        self.repo.list_all_paths_multi(user_ids, agent_id).await
+    }
+
+    async fn get_document_by_path_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        path: &str,
+    ) -> Result<MemoryDocument, WorkspaceError> {
+        self.repo
+            .get_document_by_path_multi(user_ids, agent_id, path)
+            .await
+    }
+
+    async fn list_directory_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        directory: &str,
+    ) -> Result<Vec<WorkspaceEntry>, WorkspaceError> {
+        self.repo
+            .list_directory_multi(user_ids, agent_id, directory)
+            .await
+    }
 }

src/error.rs

@@ -304,9 +304,6 @@ pub enum WorkspaceError {
     #[error("I/O error: {reason}")]
     IoError { reason: String },
 
-    #[error("Not found: {path}")]
-    NotFound { path: String },
-
     #[error("Layer not found: {name}")]
     LayerNotFound { name: String },
 

src/testing/mod.rs

@@ -28,7 +28,7 @@ use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
 
 use async_trait::async_trait;
 use rust_decimal::Decimal;
-use tokio::sync::mpsc;
+use tokio::sync::{Mutex as AsyncMutex, mpsc};
 
 use crate::agent::AgentDeps;
 use crate::channels::{
@@ -361,6 +361,75 @@ impl Channel for StubChannel {
     }
 }
 
+/// Captured broadcast deliveries keyed by the target user or chat identifier.
+pub type BroadcastCapture = Arc<AsyncMutex<Vec<(String, OutgoingResponse)>>>;
+
+/// A lightweight channel double that only records `broadcast()` traffic.
+///
+/// This is useful for unit tests that need to assert message routing without
+/// spinning up a full interactive channel harness.
+pub struct RecordingBroadcastChannel {
+    name: &'static str,
+    captures: BroadcastCapture,
+}
+
+impl RecordingBroadcastChannel {
+    pub fn new(name: &'static str) -> (Self, BroadcastCapture) {
+        let captures = Arc::new(AsyncMutex::new(Vec::new()));
+        (
+            Self {
+                name,
+                captures: Arc::clone(&captures),
+            },
+            captures,
+        )
+    }
+}
+
+#[async_trait]
+impl Channel for RecordingBroadcastChannel {
+    fn name(&self) -> &str {
+        self.name
+    }
+
+    async fn start(&self) -> Result<MessageStream, ChannelError> {
+        let (_tx, rx) = mpsc::channel::<IncomingMessage>(1);
+        Ok(Box::pin(tokio_stream::wrappers::ReceiverStream::new(rx)))
+    }
+
+    async fn respond(
+        &self,
+        _msg: &IncomingMessage,
+        _response: OutgoingResponse,
+    ) -> Result<(), ChannelError> {
+        Ok(())
+    }
+
+    async fn send_status(
+        &self,
+        _status: StatusUpdate,
+        _metadata: &serde_json::Value,
+    ) -> Result<(), ChannelError> {
+        Ok(())
+    }
+
+    async fn broadcast(
+        &self,
+        user_id: &str,
+        response: OutgoingResponse,
+    ) -> Result<(), ChannelError> {
+        self.captures
+            .lock()
+            .await
+            .push((user_id.to_string(), response));
+        Ok(())
+    }
+
+    async fn health_check(&self) -> Result<(), ChannelError> {
+        Ok(())
+    }
+}
+
 /// Assembled test components.
 pub struct TestHarness {
     /// The agent dependencies, ready for use.

src/tools/builtin/memory.rs

@@ -271,12 +271,13 @@ impl Tool for MemoryWriteTool {
             .and_then(|v| v.as_bool())
             .unwrap_or(false);
 
+        // Parse timezone once for targets that need it (daily_log).
+        let tz = crate::timezone::parse_timezone(&ctx.user_timezone).unwrap_or(chrono_tz::Tz::UTC);
+
         // Resolve the target to a workspace path
         let resolved_path = match target {
             "memory" => paths::MEMORY.to_string(),
             "daily_log" => {
-                let tz = crate::timezone::parse_timezone(&ctx.user_timezone)
-                    .unwrap_or(chrono_tz::Tz::UTC);
                 let now = chrono::Utc::now().with_timezone(&tz);
                 format!("daily/{}.md", now.format("%Y-%m-%d"))
             }
@@ -318,8 +319,6 @@ impl Tool for MemoryWriteTool {
                     }
                 }
                 "daily_log" => {
-                    let tz = crate::timezone::parse_timezone(&ctx.user_timezone)
-                        .unwrap_or(chrono_tz::Tz::UTC);
                     self.workspace
                         .append_daily_log_tz(content, tz)
                         .await

src/tools/builtin/message.rs

@@ -80,6 +80,12 @@ fn metadata_notify_user(metadata: &serde_json::Value) -> Option<String> {
     metadata_string(metadata, "notify_user").filter(|value| value != "default")
 }
 
+// Autonomous runs include `owner_id` when the job is executing on behalf of a
+// durable owner scope instead of an interactive channel actor.
+fn metadata_owner_id(metadata: &serde_json::Value) -> Option<String> {
+    metadata_string(metadata, "owner_id")
+}
+
 fn channel_matches_source(resolved_channel: Option<&str>, source_channel: Option<&str>) -> bool {
     match (resolved_channel, source_channel) {
         (None, _) => true,
@@ -91,11 +97,13 @@ fn channel_matches_source(resolved_channel: Option<&str>, source_channel: Option
 async fn resolve_channel_fallback_target(
     extension_manager: Option<&Arc<ExtensionManager>>,
     channel: Option<&str>,
+    owner_scope_target: Option<&str>,
     ctx_user_id: &str,
 ) -> Option<String> {
-    let channel_name = channel?;
+    // Prefer an explicit channel binding when the extension manager knows the
-
+    // durable delivery target (for example, a bound Telegram chat ID).
-    if let Some(extension_manager) = extension_manager
+    if let Some(channel_name) = channel
+        && let Some(extension_manager) = extension_manager
         && let Some(target) = extension_manager
             .notification_target_for_channel(channel_name)
             .await
@@ -103,13 +111,19 @@ async fn resolve_channel_fallback_target(
         return Some(target);
     }
 
-    Some(ctx_user_id.to_string())
+    // `owner_id` is only present for autonomous owner-scoped executions.
+    // Interactive chat turns intentionally fall back to `ctx.user_id`, which is
+    // already the active conversation target for the current channel.
+    owner_scope_target
+        .map(ToOwned::to_owned)
+        .or_else(|| Some(ctx_user_id.to_string()))
 }
 
 struct MessageTargetResolution<'a> {
     extension_manager: Option<&'a Arc<ExtensionManager>>,
     explicit_target: Option<String>,
     metadata_target: Option<String>,
+    owner_scope_target: Option<String>,
     default_target: Option<String>,
     channel: Option<&'a str>,
     metadata_channel: Option<&'a str>,
@@ -133,6 +147,7 @@ async fn resolve_message_target(inputs: MessageTargetResolution<'_>) -> Option<S
         return resolve_channel_fallback_target(
             inputs.extension_manager,
             inputs.channel,
+            inputs.owner_scope_target.as_deref(),
             inputs.ctx_user_id,
         )
         .await;
@@ -145,9 +160,12 @@ async fn resolve_message_target(inputs: MessageTargetResolution<'_>) -> Option<S
     }
 
     if inputs.channel.is_some() {
+        // Shared per-turn conversation defaults are already scoped to the
+        // active interactive target, so owner scope metadata is irrelevant.
         return resolve_channel_fallback_target(
             inputs.extension_manager,
             inputs.channel,
+            None,
             inputs.ctx_user_id,
         )
         .await;
@@ -224,8 +242,9 @@ impl Tool for MessageTool {
             .unwrap_or_else(|e| e.into_inner())
             .clone();
         let metadata_target = metadata_notify_user(&ctx.metadata);
+        let owner_scope_target = metadata_owner_id(&ctx.metadata);
         let has_execution_routing_metadata =
-            metadata_channel.is_some() || metadata_target.is_some();
+            metadata_channel.is_some() || metadata_target.is_some() || owner_scope_target.is_some();
 
         // Job metadata is authoritative for autonomous executions. The shared
         // conversation defaults are only a legacy fallback when no execution-local
@@ -250,6 +269,7 @@ impl Tool for MessageTool {
             extension_manager: self.extension_manager.as_ref(),
             explicit_target,
             metadata_target,
+            owner_scope_target,
             default_target,
             channel: channel.as_deref(),
             metadata_channel: metadata_channel.as_deref(),
@@ -405,83 +425,13 @@ impl Tool for MessageTool {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use async_trait::async_trait;
+    use crate::testing::{BroadcastCapture, RecordingBroadcastChannel};
-    use tokio::sync::{Mutex, mpsc};
-
-    use crate::channels::{
-        Channel, IncomingMessage, MessageStream, OutgoingResponse, StatusUpdate,
-    };
-    use crate::error::ChannelError;
-
-    type BroadcastCapture = Arc<Mutex<Vec<(String, OutgoingResponse)>>>;
-
-    struct RecordingChannel {
-        name: &'static str,
-        captures: BroadcastCapture,
-    }
-
-    impl RecordingChannel {
-        fn new(name: &'static str) -> (Self, BroadcastCapture) {
-            let captures = Arc::new(Mutex::new(Vec::new()));
-            (
-                Self {
-                    name,
-                    captures: Arc::clone(&captures),
-                },
-                captures,
-            )
-        }
-    }
-
-    #[async_trait]
-    impl Channel for RecordingChannel {
-        fn name(&self) -> &str {
-            self.name
-        }
-
-        async fn start(&self) -> Result<MessageStream, ChannelError> {
-            let (_tx, rx) = mpsc::channel::<IncomingMessage>(1);
-            Ok(Box::pin(tokio_stream::wrappers::ReceiverStream::new(rx)))
-        }
-
-        async fn respond(
-            &self,
-            _msg: &IncomingMessage,
-            _response: OutgoingResponse,
-        ) -> Result<(), ChannelError> {
-            Ok(())
-        }
-
-        async fn send_status(
-            &self,
-            _status: StatusUpdate,
-            _metadata: &serde_json::Value,
-        ) -> Result<(), ChannelError> {
-            Ok(())
-        }
-
-        async fn broadcast(
-            &self,
-            user_id: &str,
-            response: OutgoingResponse,
-        ) -> Result<(), ChannelError> {
-            self.captures
-                .lock()
-                .await
-                .push((user_id.to_string(), response));
-            Ok(())
-        }
-
-        async fn health_check(&self) -> Result<(), ChannelError> {
-            Ok(())
-        }
-    }
 
     async fn message_tool_with_recording_channels()
     -> (MessageTool, BroadcastCapture, BroadcastCapture) {
         let channel_manager = ChannelManager::new();
-        let (gateway, gateway_captures) = RecordingChannel::new("gateway");
+        let (gateway, gateway_captures) = RecordingBroadcastChannel::new("gateway");
-        let (telegram, telegram_captures) = RecordingChannel::new("telegram");
+        let (telegram, telegram_captures) = RecordingBroadcastChannel::new("telegram");
         channel_manager.add(Box::new(gateway)).await;
         channel_manager.add(Box::new(telegram)).await;
 
@@ -870,28 +820,63 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn message_tool_falls_back_to_ctx_user_when_channel_known() {
+    async fn message_tool_falls_back_to_owner_scope_when_channel_known() {
-        // Regression for owner-scoped notifications: a channel can be known
+        let (tool, gateway_captures, telegram_captures) =
-        // even when the concrete delivery target is omitted, so the message
+            message_tool_with_recording_channels().await;
-        // tool should pass ctx.user_id through to the channel layer.
-        let tool = MessageTool::new(Arc::new(ChannelManager::new()));
 
         let mut ctx =
-            crate::context::JobContext::with_user("owner-scope", "routine-job", "price alert");
+            crate::context::JobContext::with_user("telegram", "routine-job", "price alert");
+        ctx.metadata = serde_json::json!({
+            "notify_channel": "telegram",
+            "owner_id": "owner-scope",
+        });
+
+        let result = tool
+            .execute(serde_json::json!({"content": "NEAR price is $5"}), &ctx)
+            .await
+            .expect("message tool should use owner scope before ctx.user_id");
+
+        assert_eq!(
+            result.result.as_str(),
+            Some("Sent message to telegram:owner-scope")
+        );
+        assert!(gateway_captures.lock().await.is_empty());
+        let telegram = telegram_captures.lock().await.clone();
+        assert_eq!(telegram.len(), 1);
+        assert_eq!(telegram[0].0, "owner-scope");
+        assert_eq!(telegram[0].1.content, "NEAR price is $5");
+    }
+
+    #[tokio::test]
+    async fn message_tool_falls_back_to_ctx_user_when_owner_scope_absent() {
+        let (tool, gateway_captures, telegram_captures) =
+            message_tool_with_recording_channels().await;
+
+        let mut ctx = crate::context::JobContext::with_user(
+            "interactive-chat-user",
+            "routine-job",
+            "price alert",
+        );
         ctx.metadata = serde_json::json!({
             "notify_channel": "telegram",
         });
 
         let result = tool
             .execute(serde_json::json!({"content": "NEAR price is $5"}), &ctx)
-            .await;
+            .await
+            .expect(
+                "message tool should fall back to ctx.user_id when owner scope metadata is absent",
+            );
 
-        assert!(result.is_err()); // safety: test-only assertion
+        assert_eq!(
-        let err = result.unwrap_err().to_string();
+            result.result.as_str(),
-        let mentions_missing_target = err.contains("No target specified");
+            Some("Sent message to telegram:interactive-chat-user")
-        assert!(!mentions_missing_target); // safety: test-only assertion
+        );
-        let mentions_missing_channel = err.contains("No channel specified");
+        assert!(gateway_captures.lock().await.is_empty());
-        assert!(!mentions_missing_channel); // safety: test-only assertion
+        let telegram = telegram_captures.lock().await.clone();
+        assert_eq!(telegram.len(), 1);
+        assert_eq!(telegram[0].0, "interactive-chat-user");
+        assert_eq!(telegram[0].1.content, "NEAR price is $5");
     }
 
     #[tokio::test]

src/worker/job.rs

@@ -1438,6 +1438,9 @@ impl From<TaskOutput> for Result<String, Error> {
 
 #[cfg(test)]
 mod tests {
+    use std::sync::Arc;
+
+    use crate::channels::ChannelManager;
     use crate::llm::ToolSelection;
 
     use super::*;
@@ -1448,6 +1451,8 @@ mod tests {
         ToolCompletionResponse,
     };
     use crate::safety::SafetyLayer;
+    use crate::testing::{BroadcastCapture, RecordingBroadcastChannel};
+    use crate::tools::builtin::MessageTool;
     use crate::tools::{Tool, ToolError as ToolExecError, ToolOutput};
 
     /// A test tool that sleeps for a configurable duration before returning.
@@ -1539,6 +1544,20 @@ mod tests {
         Worker::new(job_id, deps)
     }
 
+    async fn make_worker_with_message_tool()
+    -> (Worker, Arc<MessageTool>, BroadcastCapture, BroadcastCapture) {
+        let channel_manager = ChannelManager::new();
+        let (gateway, gateway_captures) = RecordingBroadcastChannel::new("gateway");
+        let (telegram, telegram_captures) = RecordingBroadcastChannel::new("telegram");
+        channel_manager.add(Box::new(gateway)).await;
+        channel_manager.add(Box::new(telegram)).await;
+
+        let message_tool = Arc::new(MessageTool::new(Arc::new(channel_manager)));
+        let worker = make_worker(vec![message_tool.clone()]).await;
+
+        (worker, message_tool, gateway_captures, telegram_captures)
+    }
+
     #[test]
     fn test_tool_selection_preserves_call_id() {
         let selection = ToolSelection {
@@ -2147,4 +2166,50 @@ mod tests {
 
         assert_eq!(ctx.metadata, original); // safety: test
     }
+
+    #[tokio::test]
+    async fn autonomous_message_tool_ignores_stale_gateway_context_when_routine_metadata_targets_telegram()
+     {
+        let (worker, message_tool, gateway_captures, telegram_captures) =
+            make_worker_with_message_tool().await;
+
+        message_tool
+            .set_context(
+                Some("gateway".to_string()),
+                Some("stale-gateway-target".to_string()),
+            )
+            .await;
+
+        worker
+            .context_manager()
+            .update_context(worker.job_id, |ctx| {
+                ctx.user_id = "telegram".to_string();
+                ctx.metadata = serde_json::json!({
+                    "notify_channel": "telegram",
+                    "owner_id": "owner-scope",
+                });
+                Ok::<(), String>(())
+            })
+            .await
+            .unwrap() // safety: test
+            .unwrap(); // safety: test
+
+        let result = worker
+            .execute_tool(
+                "message",
+                &serde_json::json!({"content": "hello from routine"}),
+            )
+            .await
+            .unwrap(); // safety: test
+        assert!(
+            result.contains("telegram:owner-scope"),
+            "expected telegram owner-scope routing, got: {result}"
+        );
+
+        assert!(gateway_captures.lock().await.is_empty());
+        let telegram = telegram_captures.lock().await.clone();
+        assert_eq!(telegram.len(), 1);
+        assert_eq!(telegram[0].0, "owner-scope");
+        assert_eq!(telegram[0].1.content, "hello from routine");
+    }
 }

src/workspace/README.md

@@ -91,6 +91,27 @@ Default k=60. Results from both methods are combined, with documents appearing i
 - **PostgreSQL:** `ts_rank_cd` for FTS, pgvector cosine distance for vectors, full RRF
 - **libSQL:** FTS5 for keyword search + vector search via `libsql_vector_idx` (dimension set dynamically by `ensure_vector_index()` during startup)
 
+## Multi-Scope Reads & Identity Isolation
+
+When a workspace has additional read scopes (via `with_additional_read_scopes`), read operations can span multiple user scopes — a user with scopes `["alice", "shared"]` can read documents from both.
+
+**Identity files are exempt from multi-scope reads.** The system prompt reads identity and configuration files from the **primary scope only** (`read_primary()`), never from secondary scopes:
+
+| File | Read method | Rationale |
+|------|------------|-----------|
+| AGENTS.md | `read_primary()` | Agent instructions are per-user |
+| SOUL.md | `read_primary()` | Core values are per-user |
+| USER.md | `read_primary()` | User context is per-user |
+| IDENTITY.md | `read_primary()` | Identity is per-user |
+| TOOLS.md | `read_primary()` | Tool config is per-user |
+| BOOTSTRAP.md | `read_primary()` | Onboarding is per-user |
+| MEMORY.md | `read()` | Shared memory is a feature |
+| daily/*.md | `read()` | Shared daily logs are a feature |
+
+**Why:** Without this, a user with read access to another scope could silently inherit that scope's identity if their own copy is missing. The agent would present itself as the wrong user — a correctness and security issue.
+
+**Design rule:** If you want shared identity across users, seed the same content into each user's scope at setup time. Don't rely on multi-scope fallback for identity files.
+
 ## Heartbeat System
 
 Proactive periodic execution (default: 30 minutes):

src/workspace/document.rs

@@ -37,6 +37,25 @@ pub mod paths {
     pub const ASSISTANT_DIRECTIVES: &str = "context/assistant-directives.md";
 }
 
+/// Paths treated as identity documents for multi-scope isolation.
+///
+/// These files are always read from the primary scope only — never from
+/// secondary read scopes. This prevents silent identity inheritance
+/// (e.g., user A accidentally presenting as user B).
+pub const IDENTITY_PATHS: &[&str] = &[
+    paths::IDENTITY,
+    paths::SOUL,
+    paths::AGENTS,
+    paths::USER,
+    paths::TOOLS,
+    paths::BOOTSTRAP,
+];
+
+/// Check if a path is an identity document that must be isolated to primary scope.
+pub fn is_identity_path(path: &str) -> bool {
+    IDENTITY_PATHS.contains(&path)
+}
+
 /// A memory document stored in the database.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct MemoryDocument {
@@ -101,10 +120,7 @@ impl MemoryDocument {
 
     /// Check if this is a well-known identity document.
     pub fn is_identity_document(&self) -> bool {
-        matches!(
+        is_identity_path(&self.path)
-            self.path.as_str(),
-            paths::IDENTITY | paths::SOUL | paths::AGENTS | paths::USER
-        )
     }
 }
 
@@ -128,6 +144,42 @@ impl WorkspaceEntry {
     }
 }
 
+/// Merge workspace entries from multiple scopes into a deduplicated, sorted list.
+///
+/// When the same path appears in multiple scopes:
+/// - Keeps the most recent `updated_at`
+/// - If any scope marks it as a directory, the merged entry is a directory
+pub fn merge_workspace_entries(
+    entries: impl IntoIterator<Item = WorkspaceEntry>,
+) -> Vec<WorkspaceEntry> {
+    let mut seen = std::collections::HashMap::new();
+    for entry in entries {
+        seen.entry(entry.path.clone())
+            .and_modify(|existing: &mut WorkspaceEntry| {
+                // Keep the most recent updated_at (and its content_preview)
+                if let (Some(existing_ts), Some(new_ts)) = (&existing.updated_at, &entry.updated_at)
+                {
+                    if new_ts > existing_ts {
+                        existing.updated_at = Some(*new_ts);
+                        existing.content_preview = entry.content_preview.clone();
+                    }
+                } else if existing.updated_at.is_none() {
+                    existing.updated_at = entry.updated_at;
+                    existing.content_preview = entry.content_preview.clone();
+                }
+                // If either is a directory, mark as directory
+                if entry.is_directory {
+                    existing.is_directory = true;
+                    existing.content_preview = None;
+                }
+            })
+            .or_insert(entry);
+    }
+    let mut result: Vec<WorkspaceEntry> = seen.into_values().collect();
+    result.sort_by(|a, b| a.path.cmp(&b.path));
+    result
+}
+
 /// A chunk of a memory document for search indexing.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct MemoryChunk {
@@ -226,4 +278,115 @@ mod tests {
         };
         assert_eq!(entry.name(), "alpha");
     }
+
+    #[test]
+    fn test_merge_workspace_entries_empty() {
+        let result = merge_workspace_entries(vec![]);
+        assert!(result.is_empty());
+    }
+
+    #[test]
+    fn test_merge_workspace_entries_keeps_newer_timestamp_and_preview() {
+        use chrono::TimeZone;
+        let old_ts = chrono::Utc.with_ymd_and_hms(2025, 1, 1, 0, 0, 0).unwrap();
+        let new_ts = chrono::Utc.with_ymd_and_hms(2025, 6, 1, 0, 0, 0).unwrap();
+
+        let entries = vec![
+            WorkspaceEntry {
+                path: "notes.md".to_string(),
+                is_directory: false,
+                updated_at: Some(old_ts),
+                content_preview: Some("old".to_string()),
+            },
+            WorkspaceEntry {
+                path: "notes.md".to_string(),
+                is_directory: false,
+                updated_at: Some(new_ts),
+                content_preview: Some("new".to_string()),
+            },
+        ];
+
+        let result = merge_workspace_entries(entries);
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].updated_at, Some(new_ts));
+        assert_eq!(result[0].content_preview, Some("new".to_string()));
+    }
+
+    #[test]
+    fn test_merge_workspace_entries_directory_wins() {
+        let entries = vec![
+            WorkspaceEntry {
+                path: "projects".to_string(),
+                is_directory: false,
+                updated_at: None,
+                content_preview: Some("file content".to_string()),
+            },
+            WorkspaceEntry {
+                path: "projects".to_string(),
+                is_directory: true,
+                updated_at: None,
+                content_preview: None,
+            },
+        ];
+
+        let result = merge_workspace_entries(entries);
+        assert_eq!(result.len(), 1);
+        assert!(result[0].is_directory);
+        assert!(result[0].content_preview.is_none());
+    }
+
+    #[test]
+    fn test_merge_workspace_entries_fills_missing_timestamp() {
+        use chrono::TimeZone;
+        let ts = chrono::Utc.with_ymd_and_hms(2025, 3, 1, 0, 0, 0).unwrap();
+
+        let entries = vec![
+            WorkspaceEntry {
+                path: "a.md".to_string(),
+                is_directory: false,
+                updated_at: None,
+                content_preview: None,
+            },
+            WorkspaceEntry {
+                path: "a.md".to_string(),
+                is_directory: false,
+                updated_at: Some(ts),
+                content_preview: None,
+            },
+        ];
+
+        let result = merge_workspace_entries(entries);
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].updated_at, Some(ts));
+    }
+
+    #[test]
+    fn test_merge_workspace_entries_sorted_by_path() {
+        let entries = vec![
+            WorkspaceEntry {
+                path: "z.md".to_string(),
+                is_directory: false,
+                updated_at: None,
+                content_preview: None,
+            },
+            WorkspaceEntry {
+                path: "a.md".to_string(),
+                is_directory: false,
+                updated_at: None,
+                content_preview: None,
+            },
+            WorkspaceEntry {
+                path: "m.md".to_string(),
+                is_directory: false,
+                updated_at: None,
+                content_preview: None,
+            },
+        ];
+
+        let result = merge_workspace_entries(entries);
+        assert_eq!(result.len(), 3);
+        assert_eq!(result[0].path, "a.md");
+        assert_eq!(result[1].path, "m.md");
+        assert_eq!(result[2].path, "z.md");
+    }
 }

src/workspace/mod.rs

@@ -52,7 +52,10 @@ mod repository;
 mod search;
 
 pub use chunker::{ChunkConfig, chunk_document};
-pub use document::{MemoryChunk, MemoryDocument, WorkspaceEntry, paths};
+pub use document::{
+    IDENTITY_PATHS, MemoryChunk, MemoryDocument, WorkspaceEntry, is_identity_path,
+    merge_workspace_entries, paths,
+};
 pub use embedding_cache::{CachedEmbeddingProvider, EmbeddingCacheConfig};
 pub use embeddings::{
     EmbeddingProvider, MockEmbeddings, NearAiEmbeddings, OllamaEmbeddings, OpenAiEmbeddings,
@@ -320,6 +323,48 @@ impl WorkspaceStorage {
             }
         }
     }
+
+    // ==================== Multi-scope read methods ====================
+
+    async fn hybrid_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        query: &str,
+        embedding: Option<&[f32]>,
+        config: &SearchConfig,
+    ) -> Result<Vec<SearchResult>, WorkspaceError> {
+        match self {
+            #[cfg(feature = "postgres")]
+            Self::Repo(repo) => {
+                repo.hybrid_search_multi(user_ids, agent_id, query, embedding, config)
+                    .await
+            }
+            Self::Db(db) => {
+                db.hybrid_search_multi(user_ids, agent_id, query, embedding, config)
+                    .await
+            }
+        }
+    }
+
+    async fn get_document_by_path_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        path: &str,
+    ) -> Result<MemoryDocument, WorkspaceError> {
+        match self {
+            #[cfg(feature = "postgres")]
+            Self::Repo(repo) => {
+                repo.get_document_by_path_multi(user_ids, agent_id, path)
+                    .await
+            }
+            Self::Db(db) => {
+                db.get_document_by_path_multi(user_ids, agent_id, path)
+                    .await
+            }
+        }
+    }
 }
 
 /// Default template seeded into HEARTBEAT.md on first access.
@@ -340,9 +385,20 @@ const BOOTSTRAP_SEED: &str = include_str!("seeds/BOOTSTRAP.md");
 /// Each workspace is scoped to a user (and optionally an agent).
 /// Documents are persisted to the database and indexed for search.
 /// Supports both PostgreSQL (via Repository) and libSQL (via Database trait).
+///
+/// ## Multi-scope reads
+///
+/// By default, a workspace reads from and writes to a single `user_id`.
+/// With `with_additional_read_scopes`, read operations (search, read, list)
+/// can span multiple user scopes while writes remain isolated to the primary
+/// `user_id`. This enables cross-tenant read access (e.g., a user reading
+/// from both their own workspace and a "shared" workspace).
 pub struct Workspace {
-    /// User identifier (from channel).
+    /// User identifier (from channel). All writes go to this scope.
     user_id: String,
+    /// User identifiers for read operations. Includes `user_id` as the first
+    /// element, plus any additional scopes added via `with_additional_read_scopes`.
+    read_user_ids: Vec<String>,
     /// Optional agent ID for multi-agent isolation.
     agent_id: Option<Uuid>,
     /// Database storage backend.
@@ -371,6 +427,7 @@ impl Workspace {
         let user_id_str = user_id.into();
         let memory_layers = crate::workspace::layer::MemoryLayer::default_for_user(&user_id_str);
         Self {
+            read_user_ids: vec![user_id_str.clone()],
             user_id: user_id_str,
             agent_id: None,
             storage: WorkspaceStorage::Repo(Repository::new(pool)),
@@ -390,6 +447,7 @@ impl Workspace {
         let user_id_str = user_id.into();
         let memory_layers = crate::workspace::layer::MemoryLayer::default_for_user(&user_id_str);
         Self {
+            read_user_ids: vec![user_id_str.clone()],
             user_id: user_id_str,
             agent_id: None,
             storage: WorkspaceStorage::Db(db),
@@ -474,6 +532,12 @@ impl Workspace {
     ///
     /// Also updates read_user_ids to include all layer scopes.
     pub fn with_memory_layers(mut self, layers: Vec<crate::workspace::layer::MemoryLayer>) -> Self {
+        // Add layer scopes to read_user_ids (same dedup logic as with_additional_read_scopes)
+        for layer in &layers {
+            if !self.read_user_ids.contains(&layer.scope) {
+                self.read_user_ids.push(layer.scope.clone());
+            }
+        }
         self.memory_layers = layers;
         self
     }
@@ -496,11 +560,37 @@ impl Workspace {
         &self.memory_layers
     }
 
-    /// Get the user ID.
+    /// Add additional user scopes for read operations.
+    ///
+    /// The primary `user_id` is always included. Additional scopes allow
+    /// read operations (search, read, list) to span multiple tenants while
+    /// writes remain isolated to the primary scope.
+    ///
+    /// Duplicate scopes are ignored.
+    pub fn with_additional_read_scopes(mut self, scopes: Vec<String>) -> Self {
+        for scope in scopes {
+            if !self.read_user_ids.contains(&scope) {
+                self.read_user_ids.push(scope);
+            }
+        }
+        self
+    }
+
+    /// Get the user ID (primary scope for writes).
     pub fn user_id(&self) -> &str {
         &self.user_id
     }
 
+    /// Get the user IDs used for read operations.
+    pub fn read_user_ids(&self) -> &[String] {
+        &self.read_user_ids
+    }
+
+    /// Whether this workspace has multiple read scopes.
+    fn is_multi_scope(&self) -> bool {
+        self.read_user_ids.len() > 1
+    }
+
     /// Get the agent ID.
     pub fn agent_id(&self) -> Option<Uuid> {
         self.agent_id
@@ -518,6 +608,33 @@ impl Workspace {
     /// println!("{}", doc.content);
     /// ```
     pub async fn read(&self, path: &str) -> Result<MemoryDocument, WorkspaceError> {
+        let path = normalize_path(path);
+        if self.is_multi_scope() && is_identity_path(&path) {
+            // Identity files must only come from the primary scope.
+            self.storage
+                .get_document_by_path(&self.user_id, self.agent_id, &path)
+                .await
+        } else if self.is_multi_scope() {
+            self.storage
+                .get_document_by_path_multi(&self.read_user_ids, self.agent_id, &path)
+                .await
+        } else {
+            self.storage
+                .get_document_by_path(&self.user_id, self.agent_id, &path)
+                .await
+        }
+    }
+
+    /// Read a file from the **primary scope only**, ignoring additional read scopes.
+    ///
+    /// Use this for identity and configuration files (AGENTS.md, SOUL.md, USER.md,
+    /// IDENTITY.md, TOOLS.md, BOOTSTRAP.md) where inheriting content from another
+    /// scope would be a correctness/security issue — the agent must never silently
+    /// present itself as the wrong user.
+    ///
+    /// For memory files that should span scopes (MEMORY.md, daily logs), use
+    /// [`read`] instead.
+    pub async fn read_primary(&self, path: &str) -> Result<MemoryDocument, WorkspaceError> {
         let path = normalize_path(path);
         self.storage
             .get_document_by_path(&self.user_id, self.agent_id, &path)
@@ -556,6 +673,9 @@ impl Workspace {
     /// Uses a single `\n` separator (suitable for log-style entries).
     /// For semantic separation (e.g., memory entries), use `append_memory()`
     /// which uses `\n\n`.
+    ///
+    /// Uses a read-modify-write pattern that is not concurrency-safe:
+    /// concurrent appends to the same path may lose writes.
     pub async fn append(&self, path: &str, content: &str) -> Result<(), WorkspaceError> {
         let path = normalize_path(path);
         // Scan system-prompt-injected files for prompt injection.
@@ -676,6 +796,20 @@ impl Workspace {
     }
 
     /// Write to a layer, with append semantics.
+    ///
+    /// Note: privacy classification only examines the new `content`, not the
+    /// full document after concatenation. See [`PatternPrivacyClassifier`]
+    /// limitations for details.
+    ///
+    /// When a privacy redirect occurs, the append targets a **separate
+    /// document** in the private scope at the same path — the shared-scope
+    /// document is left unmodified. Subsequent multi-scope reads will return
+    /// the private copy (primary scope wins), effectively shadowing the
+    /// shared document at that path. The `WriteResult::redirected` flag
+    /// indicates when this has happened.
+    ///
+    /// Uses a read-modify-write pattern that is not concurrency-safe:
+    /// concurrent appends to the same path may lose writes.
     pub async fn append_to_layer(
         &self,
         layer_name: &str,
@@ -706,13 +840,25 @@ impl Workspace {
     }
 
     /// Check if a file exists.
+    ///
+    /// When multi-scope reads are configured, checks across all read scopes.
     pub async fn exists(&self, path: &str) -> Result<bool, WorkspaceError> {
         let path = normalize_path(path);
-        match self
+        let result = if self.is_multi_scope() && is_identity_path(&path) {
-            .storage
+            // Identity files only checked in primary scope.
-            .get_document_by_path(&self.user_id, self.agent_id, &path)
+            self.storage
-            .await
+                .get_document_by_path(&self.user_id, self.agent_id, &path)
-        {
+                .await
+        } else if self.is_multi_scope() {
+            self.storage
+                .get_document_by_path_multi(&self.read_user_ids, self.agent_id, &path)
+                .await
+        } else {
+            self.storage
+                .get_document_by_path(&self.user_id, self.agent_id, &path)
+                .await
+        };
+        match result {
             Ok(_) => Ok(true),
             Err(WorkspaceError::DocumentNotFound { .. }) => Ok(false),
             Err(e) => Err(e),
@@ -747,16 +893,55 @@ impl Workspace {
     /// ```
     pub async fn list(&self, directory: &str) -> Result<Vec<WorkspaceEntry>, WorkspaceError> {
         let directory = normalize_directory(directory);
-        self.storage
+        if self.is_multi_scope() {
-            .list_directory(&self.user_id, self.agent_id, &directory)
+            // Iterate per-scope rather than using list_directory_multi because
-            .await
+            // we need to filter identity paths from secondary scopes only — the
+            // merged _multi result loses scope attribution.
+            let primary = self
+                .storage
+                .list_directory(&self.user_id, self.agent_id, &directory)
+                .await?;
+            let mut all_entries = primary;
+            for scope in &self.read_user_ids[1..] {
+                let entries = self
+                    .storage
+                    .list_directory(scope, self.agent_id, &directory)
+                    .await?;
+                all_entries.extend(entries.into_iter().filter(|e| !is_identity_path(&e.path)));
+            }
+            Ok(merge_workspace_entries(all_entries))
+        } else {
+            self.storage
+                .list_directory(&self.user_id, self.agent_id, &directory)
+                .await
+        }
     }
 
     /// List all files recursively (flat list of all paths).
+    ///
+    /// When multi-scope reads are configured, lists across all read scopes.
     pub async fn list_all(&self) -> Result<Vec<String>, WorkspaceError> {
-        self.storage
+        if self.is_multi_scope() {
-            .list_all_paths(&self.user_id, self.agent_id)
+            // Iterate per-scope rather than using list_all_paths_multi because
-            .await
+            // we need to filter identity paths from secondary scopes only.
+            // Primary scope: all paths. Secondary scopes: filter identity paths.
+            let mut all_paths = self
+                .storage
+                .list_all_paths(&self.user_id, self.agent_id)
+                .await?;
+            for scope in &self.read_user_ids[1..] {
+                let paths = self.storage.list_all_paths(scope, self.agent_id).await?;
+                all_paths.extend(paths.into_iter().filter(|p| !is_identity_path(p)));
+            }
+            // Deduplicate and sort
+            all_paths.sort();
+            all_paths.dedup();
+            Ok(all_paths)
+        } else {
+            self.storage
+                .list_all_paths(&self.user_id, self.agent_id)
+                .await
+        }
     }
 
     // ==================== Convenience Methods ====================
@@ -791,7 +976,7 @@ impl Workspace {
     /// comments, which the heartbeat runner treats as "effectively empty"
     /// and skips the LLM call.
     pub async fn heartbeat_checklist(&self) -> Result<Option<String>, WorkspaceError> {
-        match self.read(paths::HEARTBEAT).await {
+        match self.read_primary(paths::HEARTBEAT).await {
             Ok(doc) => Ok(Some(doc.content)),
             Err(WorkspaceError::DocumentNotFound { .. }) => Ok(Some(HEARTBEAT_SEED.to_string())),
             Err(e) => Err(e),
@@ -799,7 +984,29 @@ impl Workspace {
     }
 
     /// Helper to read or create a file.
+    ///
+    /// When multi-scope reads are configured, checks all read scopes before
+    /// creating. If the file exists in any scope, returns it. If not found in
+    /// any scope, creates it in the primary (write) scope.
+    ///
+    /// **Important:** In multi-scope mode, the returned document may belong to
+    /// a secondary scope. Callers that intend to **write** to the document
+    /// (via `update_document(doc.id, ...)`) must NOT use this method — use
+    /// `storage.get_or_create_document_by_path(&self.user_id, ...)` instead
+    /// to guarantee writes target the primary scope. See `append_memory` for
+    /// the correct pattern.
     async fn read_or_create(&self, path: &str) -> Result<MemoryDocument, WorkspaceError> {
+        if self.is_multi_scope() {
+            match self
+                .storage
+                .get_document_by_path_multi(&self.read_user_ids, self.agent_id, path)
+                .await
+            {
+                Ok(doc) => return Ok(doc),
+                Err(WorkspaceError::DocumentNotFound { .. }) => {}
+                Err(e) => return Err(e),
+            }
+        }
         self.storage
             .get_or_create_document_by_path(&self.user_id, self.agent_id, path)
             .await
@@ -811,9 +1018,18 @@ impl Workspace {
     ///
     /// This is for important facts, decisions, and preferences worth
     /// remembering long-term.
+    ///
+    /// Uses `get_or_create_document_by_path` with the primary `user_id`
+    /// instead of `self.memory()` to guarantee writes always target the
+    /// primary (write) scope.  `self.memory()` delegates to `read_or_create`,
+    /// which in multi-scope mode may return a document owned by a secondary
+    /// scope; writing to that document by UUID would violate write isolation.
     pub async fn append_memory(&self, entry: &str) -> Result<(), WorkspaceError> {
-        // Use double newline for memory entries (semantic separation)
+        // Always get/create in the primary scope to preserve write isolation.
-        let doc = self.memory().await?;
+        let doc = self
+            .storage
+            .get_or_create_document_by_path(&self.user_id, self.agent_id, paths::MEMORY)
+            .await?;
         let new_content = if doc.content.is_empty() {
             entry.to_string()
         } else {
@@ -905,9 +1121,16 @@ impl Workspace {
         // Safety net: if `profile_onboarding_completed` was already set (the
         // LLM completed onboarding but forgot to delete BOOTSTRAP.md), skip
         // injection to avoid repeating the first-run ritual.
+        //
+        // Identity and config files use read_primary() to prevent cross-scope
+        // bleed in multi-scope workspaces. Without this, a user with read access
+        // to other scopes could silently inherit another user's identity if their
+        // own copy is missing — the agent would present as the wrong person.
+        // Memory files (MEMORY.md, daily logs) intentionally use multi-scope
+        // read() since sharing memory across scopes is a feature.
         let bootstrap_injected = if self.is_bootstrap_completed() {
             if self
-                .read(paths::BOOTSTRAP)
+                .read_primary(paths::BOOTSTRAP)
                 .await
                 .is_ok_and(|d| !d.content.is_empty())
             {
@@ -917,7 +1140,7 @@ impl Workspace {
                 );
             }
             false
-        } else if let Ok(doc) = self.read(paths::BOOTSTRAP).await
+        } else if let Ok(doc) = self.read_primary(paths::BOOTSTRAP).await
             && !doc.content.is_empty()
         {
             parts.push(format!("## First-Run Bootstrap\n\n{}", doc.content));
@@ -926,7 +1149,8 @@ impl Workspace {
             false
         };
 
-        // Load identity files in order of importance
+        // Load identity files in order of importance.
+        // These MUST use read_primary() — see comment above.
         let identity_files = [
             (paths::AGENTS, "## Agent Instructions"),
             (paths::SOUL, "## Core Values"),
@@ -935,7 +1159,7 @@ impl Workspace {
         ];
 
         for (path, header) in identity_files {
-            if let Ok(doc) = self.read(path).await
+            if let Ok(doc) = self.read_primary(path).await
                 && !doc.content.is_empty()
             {
                 parts.push(format!("{}\n\n{}", header, doc.content));
@@ -944,7 +1168,8 @@ impl Workspace {
 
         // Tool notes: environment-specific guidance the agent or user has written.
         // TOOLS.md does not control tool availability; it is guidance only.
-        if let Ok(doc) = self.read(paths::TOOLS).await
+        // Uses read_primary() — tool config is per-user, not inherited.
+        if let Ok(doc) = self.read_primary(paths::TOOLS).await
             && !doc.content.is_empty()
         {
             parts.push(format!("## Tool Notes\n\n{}", doc.content));
@@ -1235,6 +1460,8 @@ impl Workspace {
     }
 
     /// Search with custom configuration.
+    ///
+    /// When multi-scope reads are configured, searches across all read scopes.
     pub async fn search_with_config(
         &self,
         query: &str,
@@ -1254,15 +1481,46 @@ impl Workspace {
             None
         };
 
-        self.storage
+        if self.is_multi_scope() {
-            .hybrid_search(
+            let results = self
-                &self.user_id,
+                .storage
-                self.agent_id,
+                .hybrid_search_multi(
-                query,
+                    &self.read_user_ids,
-                embedding.as_deref(),
+                    self.agent_id,
-                &config,
+                    query,
-            )
+                    embedding.as_deref(),
-            .await
+                    &config,
+                )
+                .await?;
+            // Post-filter: exclude identity documents from secondary scopes.
+            // Collect document IDs that are identity paths in secondary scopes.
+            let mut excluded_doc_ids = std::collections::HashSet::new();
+            for result in &results {
+                if is_identity_path(&result.document_path) {
+                    // Check if this document belongs to a secondary scope
+                    match self.storage.get_document_by_id(result.document_id).await {
+                        Ok(doc) if doc.user_id != self.user_id => {
+                            excluded_doc_ids.insert(result.document_id);
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            Ok(results
+                .into_iter()
+                .filter(|r| !excluded_doc_ids.contains(&r.document_id))
+                .collect())
+        } else {
+            self.storage
+                .hybrid_search(
+                    &self.user_id,
+                    self.agent_id,
+                    query,
+                    embedding.as_deref(),
+                    &config,
+                )
+                .await
+        }
     }
 
     // ==================== Indexing ====================
@@ -1323,13 +1581,13 @@ impl Workspace {
         // Check freshness BEFORE seeding identity files, otherwise the
         // seeded files make the workspace look non-fresh and BOOTSTRAP.md
         // never gets created.
-        let is_fresh_workspace = if self.read(paths::BOOTSTRAP).await.is_ok() {
+        let is_fresh_workspace = if self.read_primary(paths::BOOTSTRAP).await.is_ok() {
             false // BOOTSTRAP already exists
         } else {
             let (agents_res, soul_res, user_res) = tokio::join!(
-                self.read(paths::AGENTS),
+                self.read_primary(paths::AGENTS),
-                self.read(paths::SOUL),
+                self.read_primary(paths::SOUL),
-                self.read(paths::USER),
+                self.read_primary(paths::USER),
             );
             matches!(agents_res, Err(WorkspaceError::DocumentNotFound { .. }))
                 && matches!(soul_res, Err(WorkspaceError::DocumentNotFound { .. }))
@@ -1338,8 +1596,10 @@ impl Workspace {
 
         let mut count = 0;
         for (path, content) in seed_files {
-            // Skip files that already exist (never overwrite user edits)
+            // Skip files that already exist in the primary scope (never overwrite user edits).
-            match self.read(path).await {
+            // Uses read_primary to avoid false positives from secondary scopes —
+            // a file in another scope should not suppress seeding in this scope.
+            match self.read_primary(path).await {
                 Ok(_) => continue,
                 Err(WorkspaceError::DocumentNotFound { .. }) => {}
                 Err(e) => {
@@ -1360,7 +1620,8 @@ impl Workspace {
         // may already have a profile from a previous install and doesn't need
         // onboarding). This prevents existing users from getting a spurious
         // first-run ritual after upgrading.
-        let has_profile = self.read(paths::PROFILE).await.is_ok_and(|d| {
+        // Uses read_primary() to avoid false positives from secondary scopes.
+        let has_profile = self.read_primary(paths::PROFILE).await.is_ok_and(|d| {
             !d.content.trim().is_empty()
                 && serde_json::from_str::<crate::profile::PsychographicProfile>(&d.content).is_ok()
         });
@@ -1791,4 +2052,67 @@ mod seed_tests {
             "BOOTSTRAP.md should NOT have been seeded with existing profile"
         );
     }
+
+    #[test]
+    fn test_default_single_scope() {
+        // Verify backward compatibility: default workspace has single read scope
+        // matching user_id.
+        let user_id = "alice";
+        let read_user_ids = [user_id.to_string()];
+        assert_eq!(read_user_ids.len(), 1);
+        assert_eq!(read_user_ids[0], user_id);
+    }
+
+    #[test]
+    fn test_additional_read_scopes() {
+        // Verify that additional read scopes are added correctly.
+        let user_id = "alice".to_string();
+        let mut read_user_ids = Vec::from([user_id.clone()]);
+
+        // Simulate with_additional_read_scopes logic
+        let scopes = ["shared", "team"];
+        for scope in scopes {
+            let s = scope.to_string();
+            if !read_user_ids.contains(&s) {
+                read_user_ids.push(s);
+            }
+        }
+
+        assert_eq!(read_user_ids.len(), 3);
+        assert_eq!(read_user_ids[0], "alice");
+        assert_eq!(read_user_ids[1], "shared");
+        assert_eq!(read_user_ids[2], "team");
+    }
+
+    #[test]
+    fn test_additional_read_scopes_dedup() {
+        // Verify that duplicate scopes are ignored.
+        let user_id = "alice".to_string();
+        let mut read_user_ids = Vec::from([user_id.clone()]);
+
+        let scopes = ["shared", "alice", "shared"];
+        for scope in scopes {
+            let s = scope.to_string();
+            if !read_user_ids.contains(&s) {
+                read_user_ids.push(s);
+            }
+        }
+
+        assert_eq!(read_user_ids.len(), 2);
+        assert_eq!(read_user_ids[0], "alice");
+        assert_eq!(read_user_ids[1], "shared");
+    }
+
+    #[test]
+    fn test_is_multi_scope_logic() {
+        // Test the multi-scope detection logic: > 1 means multi-scope
+        let single_count = 1_usize;
+        let multi_count = 2_usize;
+
+        // Single scope: not multi
+        assert!(single_count <= 1);
+
+        // Multi scope: is multi
+        assert!(multi_count > 1);
+    }
 }

src/workspace/repository.rs

@@ -502,4 +502,203 @@ impl Repository {
             })
             .collect())
     }
+
+    // ==================== Multi-scope search (optimized SQL) ====================
+
+    /// Hybrid search across multiple user scopes with efficient SQL.
+    ///
+    /// Uses `user_id = ANY($1::text[])` instead of N separate queries.
+    pub async fn hybrid_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        query: &str,
+        embedding: Option<&[f32]>,
+        config: &SearchConfig,
+    ) -> Result<Vec<SearchResult>, WorkspaceError> {
+        let fts_results = if config.use_fts {
+            self.fts_search_multi(user_ids, agent_id, query, config.pre_fusion_limit)
+                .await?
+        } else {
+            Vec::new()
+        };
+
+        let vector_results = if config.use_vector {
+            if let Some(embedding) = embedding {
+                self.vector_search_multi(user_ids, agent_id, embedding, config.pre_fusion_limit)
+                    .await?
+            } else {
+                Vec::new()
+            }
+        } else {
+            Vec::new()
+        };
+
+        Ok(fuse_results(fts_results, vector_results, config))
+    }
+
+    /// FTS search across multiple user scopes.
+    async fn fts_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        query: &str,
+        limit: usize,
+    ) -> Result<Vec<RankedResult>, WorkspaceError> {
+        let conn = self.conn().await?;
+
+        let rows = conn
+            .query(
+                r#"
+                SELECT c.id as chunk_id, c.document_id, d.path as document_path,
+                       c.content,
+                       ts_rank_cd(c.content_tsv, plainto_tsquery('english', $3)) as rank
+                FROM memory_chunks c
+                JOIN memory_documents d ON d.id = c.document_id
+                WHERE d.user_id = ANY($1::text[]) AND d.agent_id IS NOT DISTINCT FROM $2
+                  AND c.content_tsv @@ plainto_tsquery('english', $3)
+                ORDER BY rank DESC
+                LIMIT $4
+                "#,
+                &[&user_ids, &agent_id, &query, &(limit as i64)],
+            )
+            .await
+            .map_err(|e| WorkspaceError::SearchFailed {
+                reason: format!("FTS multi-scope query failed: {}", e),
+            })?;
+
+        Ok(rows
+            .iter()
+            .enumerate()
+            .map(|(i, row)| RankedResult {
+                chunk_id: row.get("chunk_id"),
+                document_id: row.get("document_id"),
+                document_path: row.get("document_path"),
+                content: row.get("content"),
+                rank: (i + 1) as u32,
+            })
+            .collect())
+    }
+
+    /// Vector search across multiple user scopes.
+    async fn vector_search_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        embedding: &[f32],
+        limit: usize,
+    ) -> Result<Vec<RankedResult>, WorkspaceError> {
+        let conn = self.conn().await?;
+        let embedding_vec = Vector::from(embedding.to_vec());
+
+        let rows = conn
+            .query(
+                r#"
+                SELECT c.id as chunk_id, c.document_id, d.path as document_path,
+                       c.content, 1 - (c.embedding <=> $3) as similarity
+                FROM memory_chunks c
+                JOIN memory_documents d ON d.id = c.document_id
+                WHERE d.user_id = ANY($1::text[]) AND d.agent_id IS NOT DISTINCT FROM $2
+                  AND c.embedding IS NOT NULL
+                ORDER BY c.embedding <=> $3
+                LIMIT $4
+                "#,
+                &[&user_ids, &agent_id, &embedding_vec, &(limit as i64)],
+            )
+            .await
+            .map_err(|e| WorkspaceError::SearchFailed {
+                reason: format!("Vector multi-scope query failed: {}", e),
+            })?;
+
+        Ok(rows
+            .iter()
+            .enumerate()
+            .map(|(i, row)| RankedResult {
+                chunk_id: row.get("chunk_id"),
+                document_id: row.get("document_id"),
+                document_path: row.get("document_path"),
+                content: row.get("content"),
+                rank: (i + 1) as u32,
+            })
+            .collect())
+    }
+
+    /// List all file paths across multiple user scopes with a single query.
+    pub async fn list_all_paths_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+    ) -> Result<Vec<String>, WorkspaceError> {
+        let conn = self.conn().await?;
+
+        let rows = conn
+            .query(
+                r#"
+                SELECT DISTINCT path FROM memory_documents
+                WHERE user_id = ANY($1::text[]) AND agent_id IS NOT DISTINCT FROM $2
+                ORDER BY path
+                "#,
+                &[&user_ids, &agent_id],
+            )
+            .await
+            .map_err(|e| WorkspaceError::SearchFailed {
+                reason: format!("List paths multi-scope failed: {}", e),
+            })?;
+
+        Ok(rows.iter().map(|row| row.get("path")).collect())
+    }
+
+    /// Get a document by path across multiple user scopes.
+    ///
+    /// Returns the first match (ordered by the input user_ids priority).
+    pub async fn get_document_by_path_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        path: &str,
+    ) -> Result<MemoryDocument, WorkspaceError> {
+        let conn = self.conn().await?;
+
+        let row = conn
+            .query_opt(
+                r#"
+                SELECT id, user_id, agent_id, path, content,
+                       created_at, updated_at, metadata
+                FROM memory_documents
+                WHERE user_id = ANY($1::text[]) AND agent_id IS NOT DISTINCT FROM $2 AND path = $3
+                ORDER BY array_position($1::text[], user_id)
+                LIMIT 1
+                "#,
+                &[&user_ids, &agent_id, &path],
+            )
+            .await
+            .map_err(|e| WorkspaceError::SearchFailed {
+                reason: format!("get_document_by_path_multi failed: {}", e),
+            })?;
+
+        match row {
+            Some(row) => Ok(self.row_to_document(&row)),
+            None => Err(WorkspaceError::DocumentNotFound {
+                doc_type: path.to_string(),
+                user_id: format!("[{}]", user_ids.join(", ")),
+            }),
+        }
+    }
+
+    /// List directory contents across multiple user scopes.
+    ///
+    /// Iterates per scope and merges results. A future migration could add an
+    /// optimised SQL function, at which point this method can call it directly.
+    pub async fn list_directory_multi(
+        &self,
+        user_ids: &[String],
+        agent_id: Option<Uuid>,
+        directory: &str,
+    ) -> Result<Vec<WorkspaceEntry>, WorkspaceError> {
+        let mut all_entries = Vec::new();
+        for uid in user_ids {
+            all_entries.extend(self.list_directory(uid, agent_id, directory).await?);
+        }
+        Ok(crate::workspace::merge_workspace_entries(all_entries))
+    }
 }

tests/identity_scope_isolation.rs

@@ -0,0 +1,195 @@
+//! Tests for identity file scope isolation in multi-scope workspaces.
+//!
+//! When a workspace has multiple read scopes (e.g., Andrew can read from
+//! "andrew", "grace", "household"), identity files (SOUL.md, USER.md,
+//! IDENTITY.md, AGENTS.md) must ONLY come from the primary scope.
+//!
+//! Multi-scope reads are designed for memory sharing (MEMORY.md, daily logs),
+//! not identity inheritance. Silently inheriting identity from another scope
+//! is a correctness and security issue — the agent would present itself as
+//! the wrong user.
+//!
+//! These tests verify that:
+//! 1. Identity files are read from primary scope only
+//! 2. If the primary scope's identity file is missing, it's absent from the
+//!    system prompt — never falls back to another scope
+//! 3. Memory files (MEMORY.md) still benefit from multi-scope reads
+#![cfg(feature = "libsql")]
+
+use std::sync::Arc;
+
+use ironclaw::db::Database;
+use ironclaw::db::libsql::LibSqlBackend;
+use ironclaw::workspace::{Workspace, paths};
+
+async fn setup() -> (Arc<dyn Database>, tempfile::TempDir) {
+    let dir = tempfile::tempdir().expect("create temp dir");
+    let db_path = dir.path().join("test.db");
+    let backend = LibSqlBackend::new_local(&db_path).await.expect("create db");
+    backend.run_migrations().await.expect("run migrations");
+    let db: Arc<dyn Database> = Arc::new(backend);
+    (db, dir)
+}
+
+/// Seed a document into a specific user's workspace scope.
+async fn seed(db: &Arc<dyn Database>, user_id: &str, path: &str, content: &str) {
+    let ws = Workspace::new_with_db(user_id, db.clone());
+    ws.write(path, content)
+        .await
+        .unwrap_or_else(|e| panic!("Failed to seed {path} for {user_id}: {e}"));
+}
+
+// ─── Test 1: Primary scope identity appears in system prompt ───────────
+
+#[tokio::test]
+async fn system_prompt_uses_primary_scope_identity() {
+    let (db, _dir) = setup().await;
+
+    // Seed Alice's identity files in her own scope
+    seed(&db, "alice", paths::SOUL, "Alice is kind and curious.").await;
+    seed(
+        &db,
+        "alice",
+        paths::USER,
+        "You are talking to Alice, a software engineer.",
+    )
+    .await;
+
+    // Seed Bob's identity files in his scope
+    seed(&db, "bob", paths::SOUL, "Bob is analytical and precise.").await;
+    seed(
+        &db,
+        "bob",
+        paths::USER,
+        "You are talking to Bob, a marine biologist.",
+    )
+    .await;
+
+    // Create Alice's workspace WITH multi-scope reads including Bob
+    let ws = Workspace::new_with_db("alice", db.clone())
+        .with_additional_read_scopes(vec!["bob".to_string()]);
+
+    let prompt = ws
+        .system_prompt_for_context(false)
+        .await
+        .expect("system_prompt_for_context failed");
+
+    // Alice's identity must appear
+    assert!(
+        prompt.contains("Alice is kind and curious"),
+        "Primary scope SOUL.md should appear in system prompt.\nPrompt:\n{prompt}"
+    );
+    assert!(
+        prompt.contains("Alice, a software engineer"),
+        "Primary scope USER.md should appear in system prompt.\nPrompt:\n{prompt}"
+    );
+
+    // Bob's identity must NOT appear
+    assert!(
+        !prompt.contains("Bob is analytical"),
+        "Secondary scope SOUL.md must NOT appear in system prompt.\nPrompt:\n{prompt}"
+    );
+    assert!(
+        !prompt.contains("Bob, a marine biologist"),
+        "Secondary scope USER.md must NOT appear in system prompt.\nPrompt:\n{prompt}"
+    );
+}
+
+// ─── Test 2: Missing primary identity does NOT fall back to other scope ─
+
+#[tokio::test]
+async fn missing_primary_identity_does_not_fallback_to_other_scope() {
+    let (db, _dir) = setup().await;
+
+    // Only seed Bob's identity — Alice has no identity files
+    seed(&db, "bob", paths::SOUL, "Bob is analytical and precise.").await;
+    seed(
+        &db,
+        "bob",
+        paths::USER,
+        "You are talking to Bob, a marine biologist.",
+    )
+    .await;
+
+    // Create Alice's workspace with multi-scope reads including Bob
+    let ws = Workspace::new_with_db("alice", db.clone())
+        .with_additional_read_scopes(vec!["bob".to_string()]);
+
+    let prompt = ws
+        .system_prompt_for_context(false)
+        .await
+        .expect("system_prompt_for_context failed");
+
+    // Bob's identity must NOT appear — Alice's missing identity should stay missing,
+    // not silently inherit from Bob's scope
+    assert!(
+        !prompt.contains("Bob"),
+        "When primary scope identity is missing, must NOT fall back to secondary scope.\n\
+         This would cause the agent to present itself as the wrong user.\nPrompt:\n{prompt}"
+    );
+}
+
+// ─── Test 3: MEMORY.md still benefits from multi-scope reads ────────────
+
+#[tokio::test]
+async fn memory_files_still_use_multi_scope_reads() {
+    let (db, _dir) = setup().await;
+
+    // Seed shared memory in the "shared" scope (not Alice's primary)
+    seed(
+        &db,
+        "shared",
+        paths::MEMORY,
+        "Shared grocery list: milk, eggs, bread.",
+    )
+    .await;
+
+    // Create Alice's workspace with read access to shared scope
+    let ws = Workspace::new_with_db("alice", db.clone())
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    let prompt = ws
+        .system_prompt_for_context(false)
+        .await
+        .expect("system_prompt_for_context failed");
+
+    // Shared memory SHOULD appear — multi-scope reads are correct for memory
+    assert!(
+        prompt.contains("grocery list"),
+        "MEMORY.md should still use multi-scope reads.\nPrompt:\n{prompt}"
+    );
+}
+
+// ─── Test 4: All identity files are scope-isolated ──────────────────────
+
+#[tokio::test]
+async fn all_identity_files_are_scope_isolated() {
+    let (db, _dir) = setup().await;
+
+    // Seed identity files ONLY in the "other" scope, not in Alice's
+    seed(&db, "other", paths::AGENTS, "You are Other's agent.").await;
+    seed(&db, "other", paths::SOUL, "Other's soul values.").await;
+    seed(&db, "other", paths::USER, "You are talking to Other.").await;
+    seed(&db, "other", paths::IDENTITY, "Other's identity.").await;
+
+    // Also seed BOOTSTRAP.md and TOOLS.md in other scope
+    seed(&db, "other", "BOOTSTRAP.md", "Other's bootstrap.").await;
+    seed(&db, "other", "TOOLS.md", "Other's tool notes.").await;
+
+    // Create Alice's workspace with read access to "other"
+    let ws = Workspace::new_with_db("alice", db.clone())
+        .with_additional_read_scopes(vec!["other".to_string()]);
+
+    let prompt = ws
+        .system_prompt_for_context(false)
+        .await
+        .expect("system_prompt_for_context failed");
+
+    // None of Other's identity/config files should appear
+    assert!(
+        !prompt.contains("Other"),
+        "No identity or config files from secondary scope should appear.\n\
+         Every identity file (AGENTS.md, SOUL.md, USER.md, IDENTITY.md, \
+         BOOTSTRAP.md, TOOLS.md) must read from primary scope only.\nPrompt:\n{prompt}"
+    );
+}

tests/multi_scope_functional.rs

@@ -0,0 +1,451 @@
+#![cfg(feature = "libsql")]
+//! Integration tests for multi-scope workspace reads using file-backed libSQL.
+//!
+//! Guards the PR2 contract: workspaces can read from multiple user scopes
+//! while writes remain isolated to the primary scope.
+
+use std::sync::Arc;
+
+use ironclaw::db::Database;
+use ironclaw::db::libsql::LibSqlBackend;
+use ironclaw::workspace::Workspace;
+
+async fn setup() -> (Arc<dyn Database>, tempfile::TempDir) {
+    let dir = tempfile::tempdir().expect("create temp dir");
+    let db_path = dir.path().join("test.db");
+    let backend = LibSqlBackend::new_local(&db_path).await.expect("create db");
+    backend.run_migrations().await.expect("run migrations");
+    let db: Arc<dyn Database> = Arc::new(backend);
+    (db, dir)
+}
+
+#[tokio::test]
+async fn read_across_scopes() {
+    let (db, _dir) = setup().await;
+
+    // Write docs as the "shared" user
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/team-standup.md", "Team standup notes from Monday")
+        .await
+        .expect("shared write failed");
+
+    // Alice's workspace with "shared" as an additional read scope
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    // Alice can read shared docs
+    let doc = ws_alice
+        .read("docs/team-standup.md")
+        .await
+        .expect("cross-scope read failed");
+    assert_eq!(doc.content, "Team standup notes from Monday");
+}
+
+#[tokio::test]
+async fn write_stays_in_primary_scope() {
+    let (db, _dir) = setup().await;
+
+    // Alice has "shared" as a read scope
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    // Alice writes a personal note
+    ws_alice
+        .write("notes/personal.md", "Alice's private note")
+        .await
+        .expect("alice write failed");
+
+    // The "shared" workspace should NOT see Alice's note
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    let result = ws_shared.read("notes/personal.md").await;
+    assert!(result.is_err(), "Shared scope should not see Alice's note");
+}
+
+#[tokio::test]
+async fn list_paths_merges_across_scopes() {
+    let (db, _dir) = setup().await;
+
+    // Write as alice
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    ws_alice_plain
+        .write("notes/personal.md", "My notes")
+        .await
+        .expect("alice write failed");
+
+    // Write as shared
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/shared-doc.md", "Shared document")
+        .await
+        .expect("shared write failed");
+
+    // Alice with multi-scope should see both
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    let all_paths = ws_alice.list_all().await.expect("list_all failed");
+    assert!(
+        all_paths.contains(&"notes/personal.md".to_string()),
+        "Should contain alice's note: {:?}",
+        all_paths
+    );
+    assert!(
+        all_paths.contains(&"docs/shared-doc.md".to_string()),
+        "Should contain shared doc: {:?}",
+        all_paths
+    );
+}
+
+#[tokio::test]
+async fn list_directory_merges_across_scopes() {
+    let (db, _dir) = setup().await;
+
+    // Alice writes to docs/
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    ws_alice_plain
+        .write("docs/alice-doc.md", "Alice's doc")
+        .await
+        .expect("alice write failed");
+
+    // Shared writes to docs/
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/shared-doc.md", "Shared doc")
+        .await
+        .expect("shared write failed");
+
+    // Alice with multi-scope lists docs/
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    let entries = ws_alice.list("docs").await.expect("list failed");
+    let paths: Vec<&str> = entries.iter().map(|e| e.path.as_str()).collect();
+    assert!(
+        paths.contains(&"docs/alice-doc.md"),
+        "Should contain alice's doc: {:?}",
+        paths
+    );
+    assert!(
+        paths.contains(&"docs/shared-doc.md"),
+        "Should contain shared doc: {:?}",
+        paths
+    );
+}
+
+#[tokio::test]
+async fn search_spans_scopes() {
+    let (db, _dir) = setup().await;
+
+    // Write searchable content in shared scope
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write(
+            "docs/architecture.md",
+            "The microservice architecture uses gRPC for inter-service communication",
+        )
+        .await
+        .expect("shared write failed");
+
+    // Write searchable content in alice scope
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    ws_alice_plain
+        .write("notes/ideas.md", "Consider switching to GraphQL federation")
+        .await
+        .expect("alice write failed");
+
+    // Alice with multi-scope searches
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    // Search for content in the shared scope
+    let results = ws_alice
+        .search("microservice architecture gRPC", 10)
+        .await
+        .expect("search failed");
+    assert!(!results.is_empty(), "Should find results from shared scope");
+}
+
+#[tokio::test]
+async fn read_priority_primary_first() {
+    let (db, _dir) = setup().await;
+
+    // Write same path in both scopes
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("config/settings.md", "Shared settings v1")
+        .await
+        .expect("shared write failed");
+
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    ws_alice_plain
+        .write("config/settings.md", "Alice's settings override")
+        .await
+        .expect("alice write failed");
+
+    // Alice with multi-scope should get her own version (primary scope wins)
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+
+    let doc = ws_alice
+        .read("config/settings.md")
+        .await
+        .expect("read failed");
+    assert_eq!(
+        doc.content, "Alice's settings override",
+        "Primary scope should take priority"
+    );
+}
+
+#[tokio::test]
+async fn exists_spans_scopes() {
+    let (db, _dir) = setup().await;
+
+    // Write a doc as "shared"
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/shared-only.md", "Shared content")
+        .await
+        .expect("shared write failed");
+
+    // Alice without multi-scope should NOT see it
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    assert!(
+        !ws_alice_plain
+            .exists("docs/shared-only.md")
+            .await
+            .expect("exists failed"),
+        "Alice without multi-scope should not see shared doc"
+    );
+
+    // Alice with multi-scope should see it
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+    assert!(
+        ws_alice
+            .exists("docs/shared-only.md")
+            .await
+            .expect("exists failed"),
+        "Alice with multi-scope should see shared doc"
+    );
+}
+
+#[tokio::test]
+async fn append_stays_in_primary_scope() {
+    let (db, _dir) = setup().await;
+
+    // Write a document as "shared"
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("notes/log.md", "shared original content")
+        .await
+        .expect("shared write failed");
+
+    // Alice has "shared" as a read scope and appends to the same path
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+    ws_alice
+        .append("notes/log.md", "alice appended line")
+        .await
+        .expect("alice append failed");
+
+    // Shared document must be unchanged (write isolation)
+    let shared_doc = ws_shared
+        .read("notes/log.md")
+        .await
+        .expect("shared read failed");
+    assert_eq!(
+        shared_doc.content, "shared original content",
+        "Append must not modify the secondary scope's document"
+    );
+
+    // Alice should have her own copy with the appended content
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    let alice_doc = ws_alice_plain
+        .read("notes/log.md")
+        .await
+        .expect("alice read failed");
+    assert_eq!(
+        alice_doc.content, "alice appended line",
+        "Append should create a new document in alice's scope"
+    );
+}
+
+#[tokio::test]
+async fn append_memory_stays_in_primary_scope() {
+    let (db, _dir) = setup().await;
+
+    // Write MEMORY.md as "shared"
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("MEMORY.md", "shared memory baseline")
+        .await
+        .expect("shared write failed");
+
+    // Alice has "shared" as a read scope and appends a memory entry
+    let ws_alice = Workspace::new_with_db("alice", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string()]);
+    ws_alice
+        .append_memory("alice remembers this")
+        .await
+        .expect("alice append_memory failed");
+
+    // Shared MEMORY.md must be unchanged
+    let shared_doc = ws_shared
+        .read("MEMORY.md")
+        .await
+        .expect("shared read failed");
+    assert_eq!(
+        shared_doc.content, "shared memory baseline",
+        "append_memory must not modify the secondary scope's document"
+    );
+
+    // Alice should have her own MEMORY.md
+    let ws_alice_plain = Workspace::new_with_db("alice", Arc::clone(&db));
+    let alice_doc = ws_alice_plain
+        .read("MEMORY.md")
+        .await
+        .expect("alice read failed");
+    assert_eq!(
+        alice_doc.content, "alice remembers this",
+        "append_memory should create in alice's scope"
+    );
+}
+
+// ==================== Identity isolation tests ====================
+
+#[tokio::test]
+async fn identity_files_not_readable_from_secondary_scope() {
+    let (db, _dir) = setup().await;
+
+    let ws_other = Workspace::new_with_db("other-user", Arc::clone(&db));
+    ws_other
+        .write("IDENTITY.md", "I am the other user")
+        .await
+        .expect("write failed");
+    ws_other
+        .write("SOUL.md", "Other user soul overlay")
+        .await
+        .expect("write failed");
+    ws_other
+        .write("USER.md", "Other user profile")
+        .await
+        .expect("write failed");
+    ws_other
+        .write("AGENTS.md", "Other user agent config")
+        .await
+        .expect("write failed");
+
+    let ws_primary = Workspace::new_with_db("primary", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["other-user".to_string()]);
+
+    for path in &["IDENTITY.md", "SOUL.md", "USER.md", "AGENTS.md"] {
+        let result = ws_primary.read(path).await;
+        assert!(
+            result.is_err(),
+            "Primary should NOT read other user's {} via secondary scope",
+            path
+        );
+    }
+}
+
+#[tokio::test]
+async fn identity_files_not_in_search_from_secondary_scope() {
+    let (db, _dir) = setup().await;
+
+    let ws_other = Workspace::new_with_db("other-user", Arc::clone(&db));
+    ws_other
+        .write("SOUL.md", "Other user loves xylophone music passionately")
+        .await
+        .expect("write failed");
+    ws_other
+        .write(
+            "notes/music.md",
+            "Other user played xylophone at the concert",
+        )
+        .await
+        .expect("write failed");
+
+    let ws_primary = Workspace::new_with_db("primary", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["other-user".to_string()]);
+
+    let results = ws_primary
+        .search("xylophone", 10)
+        .await
+        .expect("search failed");
+    let has_concert = results.iter().any(|r| r.content.contains("concert"));
+    assert!(
+        has_concert,
+        "Should find non-identity content from secondary scope"
+    );
+    let has_soul = results.iter().any(|r| r.content.contains("passionately"));
+    assert!(
+        !has_soul,
+        "SOUL.md content from secondary scope should not appear in search results"
+    );
+}
+
+#[tokio::test]
+async fn identity_files_not_in_list_from_secondary_scope() {
+    let (db, _dir) = setup().await;
+
+    let ws_other = Workspace::new_with_db("other-user", Arc::clone(&db));
+    ws_other
+        .write("IDENTITY.md", "I am the other user")
+        .await
+        .expect("write failed");
+    ws_other
+        .write("notes/shared-note.md", "A shared note")
+        .await
+        .expect("write failed");
+
+    let ws_primary = Workspace::new_with_db("primary", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["other-user".to_string()]);
+
+    let paths = ws_primary.list_all().await.expect("list failed");
+    assert!(
+        !paths.contains(&"IDENTITY.md".to_string()),
+        "IDENTITY.md from secondary scope should not appear"
+    );
+    assert!(
+        paths.contains(&"notes/shared-note.md".to_string()),
+        "Non-identity files should be listed"
+    );
+}
+
+#[tokio::test]
+async fn empty_read_scopes_reads_primary_only() {
+    let (db, _dir) = setup().await;
+
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/note.md", "Shared note")
+        .await
+        .expect("write failed");
+
+    let ws_primary =
+        Workspace::new_with_db("primary", Arc::clone(&db)).with_additional_read_scopes(vec![]);
+
+    let result = ws_primary.read("docs/note.md").await;
+    assert!(
+        result.is_err(),
+        "Empty read scopes should not grant cross-scope access"
+    );
+}
+
+#[tokio::test]
+async fn duplicate_read_scopes_handled() {
+    let (db, _dir) = setup().await;
+
+    let ws_shared = Workspace::new_with_db("shared", Arc::clone(&db));
+    ws_shared
+        .write("docs/note.md", "One note")
+        .await
+        .expect("write failed");
+
+    let ws_primary = Workspace::new_with_db("primary", Arc::clone(&db))
+        .with_additional_read_scopes(vec!["shared".to_string(), "shared".to_string()]);
+
+    let doc = ws_primary.read("docs/note.md").await.expect("read failed");
+    assert_eq!(doc.content, "One note");
+}

tests/workspace_integration.rs

@@ -407,3 +407,333 @@ async fn test_workspace_system_prompt() {
 
     cleanup_user(&pool, user_id).await;
 }
+
+// ── Multi-scope workspace read tests ──────────────────────────────────
+//
+// These exercise the PostgreSQL-optimized `_multi` query paths
+// (repository.rs) that the libSQL backend covers via default trait impls.
+
+#[tokio::test]
+async fn test_multi_scope_read_across_scopes() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_read";
+    let alice_id = "ms_alice_read";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    // Write a doc as "shared"
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("docs/team-standup.md", "Team standup notes from Monday")
+        .await
+        .expect("shared write failed");
+
+    // Alice with "shared" as an additional read scope
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    let doc = ws_alice
+        .read("docs/team-standup.md")
+        .await
+        .expect("cross-scope read failed");
+    assert_eq!(doc.content, "Team standup notes from Monday");
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_write_stays_in_primary() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_write";
+    let alice_id = "ms_alice_write";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    ws_alice
+        .write("notes/personal.md", "Alice's private note")
+        .await
+        .expect("alice write failed");
+
+    // Shared workspace should NOT see Alice's note
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    let result = ws_shared.read("notes/personal.md").await;
+    assert!(result.is_err(), "Shared scope should not see Alice's note");
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_list_all_merges() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_list";
+    let alice_id = "ms_alice_list";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    // Write as alice (plain, no multi-scope)
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    ws_alice_plain
+        .write("notes/personal.md", "My notes")
+        .await
+        .expect("alice write failed");
+
+    // Write as shared
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("docs/shared-doc.md", "Shared document")
+        .await
+        .expect("shared write failed");
+
+    // Alice with multi-scope should see both
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    let all_paths = ws_alice.list_all().await.expect("list_all failed");
+    assert!(
+        all_paths.contains(&"notes/personal.md".to_string()),
+        "Should contain alice's note: {:?}",
+        all_paths
+    );
+    assert!(
+        all_paths.contains(&"docs/shared-doc.md".to_string()),
+        "Should contain shared doc: {:?}",
+        all_paths
+    );
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_list_directory_merges() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_dir";
+    let alice_id = "ms_alice_dir";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    ws_alice_plain
+        .write("docs/alice-doc.md", "Alice's doc")
+        .await
+        .expect("alice write failed");
+
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("docs/shared-doc.md", "Shared doc")
+        .await
+        .expect("shared write failed");
+
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    let entries = ws_alice.list("docs").await.expect("list failed");
+    let paths: Vec<&str> = entries.iter().map(|e| e.path.as_str()).collect();
+    assert!(
+        paths.contains(&"docs/alice-doc.md"),
+        "Should contain alice's doc: {:?}",
+        paths
+    );
+    assert!(
+        paths.contains(&"docs/shared-doc.md"),
+        "Should contain shared doc: {:?}",
+        paths
+    );
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_read_priority_primary_first() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_prio";
+    let alice_id = "ms_alice_prio";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    // Write same path in both scopes
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("config/settings.md", "Shared settings v1")
+        .await
+        .expect("shared write failed");
+
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    ws_alice_plain
+        .write("config/settings.md", "Alice's settings override")
+        .await
+        .expect("alice write failed");
+
+    // Alice with multi-scope should get her own version (primary scope wins)
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    let doc = ws_alice
+        .read("config/settings.md")
+        .await
+        .expect("read failed");
+    assert_eq!(
+        doc.content, "Alice's settings override",
+        "Primary scope should take priority"
+    );
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_exists_spans_scopes() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_exists";
+    let alice_id = "ms_alice_exists";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("docs/shared-only.md", "Shared content")
+        .await
+        .expect("shared write failed");
+
+    // Alice without multi-scope should NOT see it
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    assert!(
+        !ws_alice_plain
+            .exists("docs/shared-only.md")
+            .await
+            .expect("exists failed"),
+        "Alice without multi-scope should not see shared doc"
+    );
+
+    // Alice with multi-scope should see it
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+    assert!(
+        ws_alice
+            .exists("docs/shared-only.md")
+            .await
+            .expect("exists failed"),
+        "Alice with multi-scope should see shared doc"
+    );
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_search_spans_scopes() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_search";
+    let alice_id = "ms_alice_search";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write(
+            "docs/architecture.md",
+            "The microservice architecture uses gRPC for inter-service communication",
+        )
+        .await
+        .expect("shared write failed");
+
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    ws_alice_plain
+        .write("notes/ideas.md", "Consider switching to GraphQL federation")
+        .await
+        .expect("alice write failed");
+
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+
+    // Search for content in the shared scope
+    let results = ws_alice
+        .search_with_config(
+            "microservice gRPC architecture",
+            SearchConfig::default().fts_only(),
+        )
+        .await
+        .expect("search failed");
+    assert!(!results.is_empty(), "Should find results from shared scope");
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}
+
+#[tokio::test]
+async fn test_multi_scope_append_stays_in_primary() {
+    let pool = get_pool();
+    if try_connect(&pool).await.is_none() {
+        return;
+    }
+    let shared_id = "ms_shared_append";
+    let alice_id = "ms_alice_append";
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+
+    // Write a document as "shared"
+    let ws_shared = Workspace::new(shared_id, pool.clone());
+    ws_shared
+        .write("notes/log.md", "shared original content")
+        .await
+        .expect("shared write failed");
+
+    // Alice has "shared" as a read scope and appends to the same path
+    let ws_alice = Workspace::new(alice_id, pool.clone())
+        .with_additional_read_scopes(vec![shared_id.to_string()]);
+    ws_alice
+        .append("notes/log.md", "alice appended line")
+        .await
+        .expect("alice append failed");
+
+    // Shared document must be unchanged (write isolation)
+    let shared_doc = ws_shared
+        .read("notes/log.md")
+        .await
+        .expect("shared read failed");
+    assert_eq!(
+        shared_doc.content, "shared original content",
+        "Append must not modify the secondary scope's document"
+    );
+
+    // Alice should have her own copy with the appended content
+    let ws_alice_plain = Workspace::new(alice_id, pool.clone());
+    let alice_doc = ws_alice_plain
+        .read("notes/log.md")
+        .await
+        .expect("alice read failed");
+    assert_eq!(
+        alice_doc.content, "alice appended line",
+        "Append should create a new document in alice's scope"
+    );
+
+    cleanup_user(&pool, shared_id).await;
+    cleanup_user(&pool, alice_id).await;
+}