diff --git a/src/agent/dispatcher.rs b/src/agent/dispatcher.rs
index cba84c35..fe208c1b 100644
--- a/src/agent/dispatcher.rs
+++ b/src/agent/dispatcher.rs
@@ -63,7 +63,12 @@ impl Agent {
         );
 
         let system_prompt = if let Some(ws) = self.workspace() {
-            match ws
+            let scoped_workspace = if ws.user_id() == message.user_id {
+                Arc::clone(ws)
+            } else {
+                Arc::new(ws.scoped_to_user(&message.user_id))
+            };
+            match scoped_workspace
                 .system_prompt_for_context_tz(is_group_chat, user_tz)
                 .await
             {
diff --git a/src/workspace/mod.rs b/src/workspace/mod.rs
index 0242047f..51d7d2fc 100644
--- a/src/workspace/mod.rs
+++ b/src/workspace/mod.rs
@@ -149,6 +149,7 @@ fn reject_if_injected(path: &str, content: &str) -> Result<(), WorkspaceError> {
 ///
 /// Allows Workspace to work with either a PostgreSQL `Repository` (the original
 /// path) or any `Database` trait implementation (e.g. libSQL backend).
+#[derive(Clone)]
 enum WorkspaceStorage {
     /// PostgreSQL-backed repository (uses connection pool directly).
     #[cfg(feature = "postgres")]
@@ -576,6 +577,60 @@ impl Workspace {
         self
     }
 
+    /// Clone the workspace configuration for a different primary user scope.
+    ///
+    /// This preserves search config, embeddings, shared read scopes, memory
+    /// layers, and privacy classifier while switching the primary read/write
+    /// scope to `user_id`.
+    pub fn scoped_to_user(&self, user_id: impl Into<String>) -> Self {
+        let user_id = user_id.into();
+
+        let mut memory_layers = self.memory_layers.clone();
+        for layer in &mut memory_layers {
+            if layer.sensitivity == crate::workspace::layer::LayerSensitivity::Private
+                && layer.scope == self.user_id
+            {
+                layer.scope = user_id.clone();
+            }
+        }
+
+        let mut read_user_ids = vec![user_id.clone()];
+        for scope in &self.read_user_ids {
+            if scope != &self.user_id && !read_user_ids.contains(scope) {
+                read_user_ids.push(scope.clone());
+            }
+        }
+        for scope in crate::workspace::layer::MemoryLayer::read_scopes(&memory_layers) {
+            if !read_user_ids.contains(&scope) {
+                read_user_ids.push(scope);
+            }
+        }
+
+        let preserve_flags = user_id == self.user_id;
+        Self {
+            user_id,
+            read_user_ids,
+            agent_id: self.agent_id,
+            storage: self.storage.clone(),
+            embeddings: self.embeddings.clone(),
+            bootstrap_pending: std::sync::atomic::AtomicBool::new(if preserve_flags {
+                self.bootstrap_pending
+                    .load(std::sync::atomic::Ordering::Acquire)
+            } else {
+                false
+            }),
+            bootstrap_completed: std::sync::atomic::AtomicBool::new(if preserve_flags {
+                self.bootstrap_completed
+                    .load(std::sync::atomic::Ordering::Acquire)
+            } else {
+                false
+            }),
+            search_defaults: self.search_defaults.clone(),
+            memory_layers,
+            privacy_classifier: self.privacy_classifier.clone(),
+        }
+    }
+
     /// Get the user ID (primary scope for writes).
     pub fn user_id(&self) -> &str {
         &self.user_id
diff --git a/src/workspace/repository.rs b/src/workspace/repository.rs
index 78ddfec5..13f6816b 100644
--- a/src/workspace/repository.rs
+++ b/src/workspace/repository.rs
@@ -15,6 +15,7 @@ use crate::workspace::document::{MemoryChunk, MemoryDocument, WorkspaceEntry};
 use crate::workspace::search::{RankedResult, SearchConfig, SearchResult, fuse_results};
 
 /// Database repository for workspace operations.
+#[derive(Clone)]
 pub struct Repository {
     pool: Pool,
 }
diff --git a/tests/e2e_workspace_coverage.rs b/tests/e2e_workspace_coverage.rs
index 396b676e..68956d30 100644
--- a/tests/e2e_workspace_coverage.rs
+++ b/tests/e2e_workspace_coverage.rs
@@ -12,6 +12,7 @@ mod tests {
 
     use crate::support::test_rig::TestRigBuilder;
     use crate::support::trace_llm::LlmTrace;
+    use ironclaw::workspace::Workspace;
 
     // -----------------------------------------------------------------------
     // Test 1: write_chunk_search
@@ -268,6 +269,7 @@ mod tests {
 
     #[tokio::test]
     async fn identity_in_system_prompt() {
+        const TEST_USER_ID: &str = "test-user";
         let trace = LlmTrace::from_file(concat!(
             env!("CARGO_MANIFEST_DIR"),
             "/tests/fixtures/llm_traces/workspace/identity_prompt.json"
@@ -280,7 +282,7 @@ mod tests {
             .await;
 
         // Seed an IDENTITY.md so the system prompt has real content to inject.
-        let ws = rig.workspace().expect("workspace must be available");
+        let ws = Workspace::new_with_db(TEST_USER_ID, rig.database().clone());
         ws.write(
             "IDENTITY.md",
             "I am TestBot, a helpful testing assistant created for E2E verification.",
diff --git a/tests/multi_tenant_system_prompt.rs b/tests/multi_tenant_system_prompt.rs
index ece794bf..b89e6cb5 100644
--- a/tests/multi_tenant_system_prompt.rs
+++ b/tests/multi_tenant_system_prompt.rs
@@ -1,10 +1,10 @@
-//! Tests proving that multi-tenant system prompts are broken.
+//! Regression tests for multi-tenant system prompts.
 //!
-//! Bug: In multi-tenant mode, the agent loop uses `self.workspace()` which
-//! returns a single shared workspace (user_id="default"). Identity files
-//! (IDENTITY.md, SOUL.md, USER.md) seeded under per-user IDs ("alice",
-//! "bob") are invisible to this workspace, so the system prompt is
-//! empty/wrong.
+//! The agent must build the conversational system prompt from a workspace
+//! scoped to the incoming message's user, not from the shared owner-scope
+//! workspace created at startup. Otherwise per-user identity files
+//! (IDENTITY.md, SOUL.md, USER.md) become invisible and different users can
+//! see the same owner-scoped prompt.
 //!
 //! These tests:
 //! 1. Seed identity files for two users (alice, bob) in the database
@@ -13,7 +13,7 @@
 //!    correct user's identity
 //! 4. Verify user A's identity doesn't leak into user B's prompt
 //!
-//! All tests are expected to FAIL until the bug is fixed.
+//! These tests ensure each user's identity is isolated correctly.
 
 #[cfg(feature = "libsql")]
 mod support;