diff --git a/crates/ironclaw_engine/src/runtime/mission.rs b/crates/ironclaw_engine/src/runtime/mission.rs
index 63863a2a..4615a64c 100644
--- a/crates/ironclaw_engine/src/runtime/mission.rs
+++ b/crates/ironclaw_engine/src/runtime/mission.rs
@@ -154,7 +154,9 @@ impl MissionManager {
                     mission.next_fire_at.is_some_and(|next| next <= now)
                 }
                 MissionCadence::Manual => false,
-                MissionCadence::OnEvent { .. } | MissionCadence::OnPush => false,
+                MissionCadence::OnEvent { .. }
+                | MissionCadence::OnSystemEvent { .. }
+                | MissionCadence::Webhook { .. } => false,
             };
 
             if should_fire && let Some(tid) = self.fire_mission(mid, user_id).await? {
@@ -539,6 +541,7 @@ mod tests {
                 "periodic goal",
                 MissionCadence::Cron {
                     expression: "* * * * *".into(),
+                    timezone: None,
                 },
             )
             .await
diff --git a/crates/ironclaw_engine/src/types/mission.rs b/crates/ironclaw_engine/src/types/mission.rs
index 94870e41..3e79fea3 100644
--- a/crates/ironclaw_engine/src/types/mission.rs
+++ b/crates/ironclaw_engine/src/types/mission.rs
@@ -47,15 +47,31 @@ pub enum MissionStatus {
 }
 
 /// How a mission triggers new threads.
+///
+/// The engine defines the trigger *types*. The bridge/host implements the
+/// actual trigger infrastructure (cron tickers, webhook endpoints, event
+/// matchers). The engine just needs to be told "fire this mission now."
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum MissionCadence {
     /// Spawn on a cron schedule (e.g., "0 */6 * * *" for every 6 hours).
-    Cron { expression: String },
-    /// Spawn in response to a named event.
+    Cron {
+        expression: String,
+        timezone: Option<String>,
+    },
+    /// Spawn in response to a channel message matching a pattern.
     OnEvent { event_pattern: String },
-    /// Spawn when code is pushed (webhook-driven).
-    OnPush,
-    /// Only spawn when manually triggered.
+    /// Spawn in response to a structured system event (from tools or external).
+    OnSystemEvent {
+        source: String,
+        event_type: String,
+    },
+    /// Spawn when an external webhook is received at a registered path.
+    /// The bridge registers the webhook endpoint and routes payloads here.
+    Webhook {
+        path: String,
+        secret: Option<String>,
+    },
+    /// Only spawn when manually triggered (via mission_fire tool or API).
     Manual,
 }
 
@@ -68,10 +84,30 @@ pub struct Mission {
     pub goal: String,
     pub status: MissionStatus,
     pub cadence: MissionCadence,
+
+    // ── Evolving strategy ──
+    /// What the next thread should focus on (updated after each thread).
+    pub current_focus: Option<String>,
+    /// What approaches have been tried and what happened.
+    pub approach_history: Vec<String>,
+
+    // ── Progress tracking ──
     /// History of threads spawned by this mission.
     pub thread_history: Vec<ThreadId>,
     /// Optional criteria for declaring the mission complete.
     pub success_criteria: Option<String>,
+
+    // ── Budget ──
+    /// Maximum threads per day (0 = unlimited).
+    pub max_threads_per_day: u32,
+    /// Threads spawned today (reset daily by the cron ticker).
+    pub threads_today: u32,
+
+    // ── Trigger payload ──
+    /// Payload from the most recent trigger (webhook body, event data, etc.).
+    /// Injected into the thread's context so the code can access it.
+    pub last_trigger_payload: Option<serde_json::Value>,
+
     pub metadata: serde_json::Value,
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
@@ -94,8 +130,13 @@ impl Mission {
             goal: goal.into(),
             status: MissionStatus::Active,
             cadence,
+            current_focus: None,
+            approach_history: Vec::new(),
             thread_history: Vec::new(),
             success_criteria: None,
+            max_threads_per_day: 10,
+            threads_today: 0,
+            last_trigger_payload: None,
             metadata: serde_json::Value::Object(serde_json::Map::new()),
             created_at: now,
             updated_at: now,
diff --git a/docs/plans/2026-03-24-missions.md b/docs/plans/2026-03-24-missions.md
index 24ab12c9..44e762e5 100644
--- a/docs/plans/2026-03-24-missions.md
+++ b/docs/plans/2026-03-24-missions.md
@@ -44,6 +44,29 @@ pub struct Mission {
 
 Already defined in `crates/ironclaw_engine/src/types/mission.rs`.
 
+## Trigger Types
+
+The engine defines trigger *types*. The bridge implements the actual infrastructure:
+
+| Trigger | Engine type | Bridge implementation |
+|---|---|---|
+| Cron schedule | `MissionCadence::Cron { expression, timezone }` | Tokio interval task, cron parser |
+| Channel message | `MissionCadence::OnEvent { event_pattern }` | Regex match in `handle_message` before routing |
+| System event | `MissionCadence::OnSystemEvent { source, event_type }` | Match events from `event_emit` tool |
+| Webhook | `MissionCadence::Webhook { path, secret }` | Register HTTP endpoint on webhook server |
+| Manual | `MissionCadence::Manual` | `mission_fire` tool or API call |
+
+**Webhook-based integrations** (GitHub, email, etc.) use the generic `Webhook` cadence. The webhook payload is stored as `mission.last_trigger_payload` and injected into the thread's context:
+
+```python
+# Inside the mission's thread, the trigger payload is accessible:
+payload = state["trigger_payload"]
+# For a GitHub webhook: payload["action"], payload["issue"]["title"], etc.
+# For email: payload["from"], payload["subject"], payload["body"]
+```
+
+This means GitHub issues, PRs, email, Slack events, etc. all work through the same webhook mechanism — no special-casing in the engine.
+
 ## Architecture
 
 ```