diff --git a/contracts b/contracts
index 467240d..d8f4f31 160000
--- a/contracts
+++ b/contracts
@@ -1 +1 @@
-Subproject commit 467240deeba2cf7ff28ba32d12b5a88485be5b3d
+Subproject commit d8f4f31db267873913a0fef094a224ace2a080a6
diff --git a/packages/astrid-sdk/src/contracts.ts b/packages/astrid-sdk/src/contracts.ts
index 3e581a9..576540e 100644
--- a/packages/astrid-sdk/src/contracts.ts
+++ b/packages/astrid-sdk/src/contracts.ts
@@ -225,6 +225,35 @@ export namespace hook {
     data?: string;
   }
 
+  /**
+   * Payload of `hook.v1.event.<hook_name>` envelopes published by the
+   * hook bridge during fan-out to subscriber capsules.
+   * 
+   * Subscribers wishing to influence the outcome (merge strategies
+   * `ToolCallBefore` / `LastNonNull`) reply on the per-request
+   * scoped topic `hook.v1.response.<hook_name>.<correlation_id>`.
+   * When `correlation_id` is absent, the dispatch is fire-and-forget
+   * (merge semantics `None`) and no reply topic exists.
+   */
+  export interface HookEventRequest {
+    /**
+     * Semantic hook name (e.g. `before_tool_call`, `session_start`,
+     * `on_compaction_started`). Matches the mapping table in
+     * `astrid-capsule-hook-bridge`.
+     */
+    hook: string;
+    /**
+     * Original lifecycle event payload, serialized as JSON. Opaque
+     * to the bus — subscribers parse based on the hook name.
+     */
+    payload: string;
+    /**
+     * Per-request correlation id for scoped replies. `none` for
+     * fire-and-forget hooks.
+     */
+    correlation_id?: string;
+  }
+
 }
 
 /** Types generated from the `llm` WIT interface. */
diff --git a/packages/astrid-sdk/wit-contracts/astrid-contracts.wit b/packages/astrid-sdk/wit-contracts/astrid-contracts.wit
index edd5b0e..4765184 100644
--- a/packages/astrid-sdk/wit-contracts/astrid-contracts.wit
+++ b/packages/astrid-sdk/wit-contracts/astrid-contracts.wit
@@ -303,6 +303,27 @@ interface hook {
         /// Merged data from interceptor responses (opaque JSON).
         data: option<string>,
     }
+
+    /// Payload of `hook.v1.event.<hook_name>` envelopes published by the
+    /// hook bridge during fan-out to subscriber capsules.
+    ///
+    /// Subscribers wishing to influence the outcome (merge strategies
+    /// `ToolCallBefore` / `LastNonNull`) reply on the per-request
+    /// scoped topic `hook.v1.response.<hook_name>.<correlation_id>`.
+    /// When `correlation_id` is absent, the dispatch is fire-and-forget
+    /// (merge semantics `None`) and no reply topic exists.
+    record hook-event-request {
+        /// Semantic hook name (e.g. `before_tool_call`, `session_start`,
+        /// `on_compaction_started`). Matches the mapping table in
+        /// `astrid-capsule-hook-bridge`.
+        hook: string,
+        /// Original lifecycle event payload, serialized as JSON. Opaque
+        /// to the bus — subscribers parse based on the hook name.
+        payload: string,
+        /// Per-request correlation id for scoped replies. `none` for
+        /// fire-and-forget hooks.
+        correlation-id: option<string>,
+    }
 }
 
 // ── llm ──────────────────────────────────────────────────────────