diff --git a/.changeset/blocked-reason-not-returned.md b/.changeset/blocked-reason-not-returned.md
new file mode 100644
index 0000000..74f801b
--- /dev/null
+++ b/.changeset/blocked-reason-not-returned.md
@@ -0,0 +1,20 @@
+---
+"@senderkit/sdk": patch
+"@senderkit/cli": patch
+---
+
+Correct the `blocked` message documentation: the detailed block reason is operator-only and is not returned by the API.
+
+A prior release documented an optional `Message.blockedReason` field, but the
+app's message read endpoints (`GET /api/v1/messages` and
+`GET /api/v1/messages/:id`) never project that column — the detailed
+anti-phishing/abuse signal breakdown is deliberately operator-only (senderkit-app
+#211), so a sender can't learn how detection works. The field was therefore never
+populated on any SDK/MCP/CLI response.
+
+- **`Message`** — remove the `blockedReason` field (it was never returned) and
+  reword the `status` doc accordingly. The `[key: string]: unknown` index
+  signature is unchanged, so this is not a runtime change for any caller.
+- The `blocked` lifecycle status is unaffected: it is still a real, returned
+  `status` value and remains in `MESSAGE_STATUSES` and the
+  `senderkit_messages_list.status` filter.
diff --git a/packages/sdk/src/mcp-schemas.ts b/packages/sdk/src/mcp-schemas.ts
index 0dec5e3..7bab4dc 100644
--- a/packages/sdk/src/mcp-schemas.ts
+++ b/packages/sdk/src/mcp-schemas.ts
@@ -122,7 +122,8 @@ const emailEnvelope = {
  * The ten message lifecycle statuses (mirrors the app's `messageStatusEnum`).
  * Bounces normalize to `failed` with the reason on the message timeline.
  * `blocked` is a terminal state set when the outbound abuse scanner halts a
- * send (the human-readable trigger is on the message's `blockedReason`).
+ * send. The detailed block reason is operator-only and is not returned by the
+ * message read endpoints.
  */
 export const MESSAGE_STATUSES = [
   "scheduled",
diff --git a/packages/sdk/src/types.ts b/packages/sdk/src/types.ts
index a3345e7..0e4ae0f 100644
--- a/packages/sdk/src/types.ts
+++ b/packages/sdk/src/types.ts
@@ -195,15 +195,14 @@ export interface Message {
   publicId: string;
   /**
    * Lifecycle status (one of `MESSAGE_STATUSES`). A `blocked` message was
-   * halted by the outbound abuse scanner; `blockedReason` carries the trigger.
+   * halted by the outbound abuse scanner. The detailed block reason is
+   * operator-only and is not returned by the message read endpoints.
    */
   status: string;
   channel: Channel;
   templateSlug: string | null;
   recipient: string;
   createdAt: string;
-  /** Human-readable reason a `blocked` message was halted. Absent otherwise. */
-  blockedReason?: string | null;
   [key: string]: unknown;
 }