diff --git a/README.md b/README.md
index 9eb22a24f..9edfeb41b 100644
--- a/README.md
+++ b/README.md
@@ -268,6 +268,10 @@ unread backlog is simply its unread backlog. Receipts and subject history are
 kept in the `mcpl/coalescing` state (retry window 1 h); audit lines are
 `mcpl:coalescing` trace events.
 
+#### Per-channel conversation routing (deprecated)
+
+> **Deprecated: `FrameworkConfig.conversations` (`ConversationRouter`).** Per-channel conversation routing sends each channel's traffic to its own fork agent, spawned from a template agent and closed after an idle TTL. It is being retired ([#235](https://github.com/anima-research/agent-framework/issues/235)). Its `'mention'` bind/trigger rule, the default for channels, reads `metadata.mentioned`, which discord-mcpl does not set, so on Discord channels an @-mention never binds a fork or triggers a bound one. Don't adopt it in new hosts. Existing configurations still route exactly as before, and the framework logs one `[deprecated]` line when it is created with `conversations` set. Removal is a follow-up.
+
 ### Streaming Lifecycle
 
 1. **Start**: Framework calls `agent.startStreamWithInjections()` → `YieldingStream`
diff --git a/changelog.d/deprecate-conversation-routing.changed.md b/changelog.d/deprecate-conversation-routing.changed.md
new file mode 100644
index 000000000..6049fea82
--- /dev/null
+++ b/changelog.d/deprecate-conversation-routing.changed.md
@@ -0,0 +1,11 @@
+- **Per-channel conversation routing is deprecated** (`FrameworkConfig.conversations`,
+  `ConversationRouter`, `ConversationRouterConfig`). Its `'mention'` bind/trigger
+  rule, the default for channels, reads `metadata.mentioned`, which discord-mcpl
+  never sets, so on Discord channels an @-mention neither binds a fork nor
+  triggers a bound one (#235). Behavior is unchanged for now: routing still
+  works, and the framework logs one `[deprecated]` line when it is created with
+  `conversations` set. Removal is a follow-up. The `idleTtlMs` docs now note
+  that expiry is checked at most about once a minute, so the sweep usually
+  notices an expired binding up to ~60s after the TTL; that is not a deadline
+  for closing the fork, whose closure turn can be delayed further (e.g. while
+  the host is quiesced).
diff --git a/src/framework.ts b/src/framework.ts
index 519e30422..92aedcc1a 100644
--- a/src/framework.ts
+++ b/src/framework.ts
@@ -82,7 +82,7 @@ import { ProseStreamRouter } from './mcpl/prose-stream-router.js';
 import { detectKnownToolWrapperProse } from './tool-wrapper-prose-guard.js';
 import { InferenceRouter } from './mcpl/inference-router.js';
 import { ChannelRegistry, type ChannelToolOrigin } from './mcpl/channel-registry.js';
-import { ConversationRouter } from './mcpl/conversation-router.js';
+import { ConversationRouter, CONVERSATION_ROUTING_DEPRECATION_NOTICE } from './mcpl/conversation-router.js';
 import { safeSlice } from './safe-slice.js';
 import type { WorkspaceModule } from './modules/workspace/index.js';
 import {
@@ -1623,6 +1623,9 @@ export class AgentFramework {
         );
       }
       framework.conversationRouter = new ConversationRouter(config.conversations);
+      // Deprecated feature (agent-framework#235): still wired exactly as
+      // before, but named once per framework instance on stderr.
+      console.warn(`[deprecated] ${CONVERSATION_ROUTING_DEPRECATION_NOTICE}`);
 
       // Generation counters persist across restarts — reusing generation 1's
       // agent name after a restart would reopen (and re-seed) the previous
diff --git a/src/index.ts b/src/index.ts
index b198bcee3..bd07d3547 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -107,7 +107,9 @@ export type {
 } from './mcpl/index.js';
 
 // Per-channel conversation routing
+/** @deprecated Per-channel conversation routing is deprecated and will be removed (anima-research/agent-framework#235). */
 export { ConversationRouter, DEFAULT_CLOSURE_PROMPT } from './mcpl/index.js';
+/** @deprecated Per-channel conversation routing is deprecated and will be removed (anima-research/agent-framework#235). */
 export type {
   ConversationRouterConfig,
   ConversationBinding,
diff --git a/src/mcpl/conversation-router.ts b/src/mcpl/conversation-router.ts
index 1dba1de96..980dbee00 100644
--- a/src/mcpl/conversation-router.ts
+++ b/src/mcpl/conversation-router.ts
@@ -27,6 +27,11 @@
  * a restarted host must NOT reuse generation 1's agent name, or it would
  * reopen the previous engagement's Chronicle namespace and re-seed the
  * template context on top of the old history.
+ *
+ * DEPRECATED (anima-research/agent-framework#235): per-channel conversation
+ * routing is being retired. Behavior is unchanged for now; the framework
+ * logs one `[deprecated]` line when it is configured. Removal is a
+ * follow-up.
  */
 
 import type { ContextStrategy } from '@animalabs/context-manager';
@@ -49,6 +54,20 @@ export type TriggerRule = 'always' | 'mention';
  * inferring on every message of a four-human group DM is a firehose). */
 export type ChannelKind = 'dm' | 'groupDm' | 'channel';
 
+/** Logged once by the framework when `FrameworkConfig.conversations` is set. */
+export const CONVERSATION_ROUTING_DEPRECATION_NOTICE =
+  'Per-channel conversation routing (FrameworkConfig.conversations) is deprecated and will ' +
+  'be removed in a future release. Its \'mention\' bind/trigger rule reads ' +
+  'metadata.mentioned, which not every channel server sets (discord-mcpl does not), so on ' +
+  'such channels an @-mention neither binds a fork nor triggers a bound one. Routing still ' +
+  'works for now. See anima-research/agent-framework#235.';
+
+/**
+ * @deprecated Per-channel conversation routing is deprecated and will be
+ * removed (anima-research/agent-framework#235). Its 'mention' bind/trigger
+ * rule reads `metadata.mentioned`, which not every channel server sets.
+ * Behavior is unchanged for now.
+ */
 export interface ConversationRouterConfig {
   /** Agent whose context seeds new forks (the "trunk"/warm checkpoint). */
   templateAgent: string;
@@ -61,7 +80,15 @@ export interface ConversationRouterConfig {
    * Defaults: dm 'always', groupDm 'mention', channel 'mention'. */
   trigger?: { dm?: TriggerRule; groupDm?: TriggerRule; channel?: TriggerRule };
 
-  /** Idle time before a binding expires and the fork is closed. Default 12h. */
+  /**
+   * Idle time before a binding expires and the fork is closed. Default 12h.
+   *
+   * Expiry is checked at most about once a minute, so the sweep usually
+   * notices an expired binding up to ~60s after the TTL elapses. That is the
+   * usual extra delay, not a deadline for closing the fork: the closure turn
+   * can be delayed further (e.g. while the host is quiesced, it stays queued
+   * until resume).
+   */
   idleTtlMs?: number;
 
   /** Final system-initiated user message sent to a fork on expiry. */
@@ -116,6 +143,12 @@ export const DEFAULT_CLOSURE_PROMPT =
 // ConversationRouter
 // ============================================================================
 
+/**
+ * @deprecated Per-channel conversation routing is deprecated and will be
+ * removed (anima-research/agent-framework#235). Behavior is unchanged for
+ * now; the framework logs one `[deprecated]` line when it constructs a
+ * router from `FrameworkConfig.conversations`.
+ */
 export class ConversationRouter {
   private config: ConversationRouterConfig;
 
diff --git a/src/mcpl/index.ts b/src/mcpl/index.ts
index cda1d1093..d82790c67 100644
--- a/src/mcpl/index.ts
+++ b/src/mcpl/index.ts
@@ -158,7 +158,9 @@ export { InferenceRouter } from './inference-router.js';
 export { ChannelRegistry } from './channel-registry.js';
 
 // Per-channel conversation routing (fork-per-channel agents)
+/** @deprecated Per-channel conversation routing is deprecated and will be removed (anima-research/agent-framework#235). */
 export { ConversationRouter, DEFAULT_CLOSURE_PROMPT } from './conversation-router.js';
+/** @deprecated Per-channel conversation routing is deprecated and will be removed (anima-research/agent-framework#235). */
 export type {
   ConversationRouterConfig,
   ConversationBinding,
diff --git a/src/types/framework.ts b/src/types/framework.ts
index a0312561a..92d70fe99 100644
--- a/src/types/framework.ts
+++ b/src/types/framework.ts
@@ -274,6 +274,13 @@ export interface FrameworkConfig {
    * messages route to per-channel fork agents spawned from the template
    * agent instead of the primary conversation. If omitted, behavior is
    * unchanged (all messages go to the primary agent).
+   *
+   * @deprecated Per-channel conversation routing is deprecated and will be
+   * removed (anima-research/agent-framework#235). Its 'mention' bind/trigger
+   * rule reads `metadata.mentioned`, which not every channel server sets
+   * (discord-mcpl does not), so on those channels an @-mention neither binds
+   * a fork nor triggers a bound one. Routing still works for now; the
+   * framework logs one `[deprecated]` line at creation when this is set.
    */
   conversations?: ConversationRouterConfig;
 }
diff --git a/test/conversation-routing.test.ts b/test/conversation-routing.test.ts
index db3239b06..cd55d3c4d 100644
--- a/test/conversation-routing.test.ts
+++ b/test/conversation-routing.test.ts
@@ -4,7 +4,7 @@
  * conversation when FrameworkConfig.conversations is set.
  */
 
-import { describe, it, beforeEach, afterEach } from 'node:test';
+import { describe, it, beforeEach, afterEach, mock } from 'node:test';
 import assert from 'node:assert/strict';
 import { tmpdir } from 'node:os';
 import { mkdtempSync, rmSync } from 'node:fs';
@@ -86,6 +86,63 @@ describe('Conversation routing', () => {
     );
   });
 
+  // Deprecation (agent-framework#235): behavior unchanged, one stderr line.
+  function deprecationWarnings(warn: { mock: { calls: Array<{ arguments: unknown[] }> } }): string[] {
+    return warn.mock.calls
+      .map((c) => String(c.arguments[0]))
+      .filter((line) => line.startsWith('[deprecated]') && line.includes('conversation routing'));
+  }
+
+  it('configured: logs one [deprecated] line per framework and still routes', async () => {
+    const warn = mock.method(console, 'warn', () => {});
+    let framework: AgentFramework | undefined;
+    try {
+      framework = await makeFramework();
+      assert.equal(deprecationWarnings(warn).length, 1, 'warned once at creation');
+      assert.match(deprecationWarnings(warn)[0]!, /agent-framework#235/);
+
+      // Routing is unchanged: a DM and a channel mention each spawn a fork.
+      // (One queued response per stream: MockMembrane hands a stream every
+      // response still queued.)
+      membrane.pushResponse(createMockResponse([{ type: 'text', text: 'Hi alice!' }]));
+      framework.pushEvent(incomingEvent({ channelId: 'slack:D1', text: 'hello there', channelType: 'im' }));
+      await framework.runUntilIdle();
+      membrane.pushResponse(createMockResponse([{ type: 'text', text: 'On it.' }]));
+      framework.pushEvent(incomingEvent({ channelId: 'slack:C1', text: 'bot, help', mentioned: true }));
+      await framework.runUntilIdle();
+      assert.ok(framework.getAgent('conversation-slack-D1-g1'), 'DM fork spawned');
+      assert.ok(framework.getAgent('conversation-slack-C1-g1'), 'channel-mention fork spawned');
+      assert.equal(membrane.calls.length, 2, 'both forks ran inference');
+
+      assert.equal(deprecationWarnings(warn).length, 1, 'spawning forks does not warn again');
+    } finally {
+      warn.mock.restore();
+      await framework?.stop();
+    }
+  });
+
+  it('not configured: no [deprecated] line', async () => {
+    const warn = mock.method(console, 'warn', () => {});
+    let framework: AgentFramework | undefined;
+    try {
+      membrane.pushResponse(createMockResponse([{ type: 'text', text: 'Hi alice!' }]));
+      framework = await AgentFramework.create({
+        storePath: join(tempDir, 'test.chronicle'),
+        membrane: membrane.asMembrane(),
+        agents: [{ name: 'trunk', model: 'test-model', systemPrompt: 'You are the trunk.' }],
+        modules: [],
+      });
+      framework.pushEvent(incomingEvent({ channelId: 'slack:D1', text: 'hello there', channelType: 'im' }));
+      await framework.runUntilIdle();
+
+      assert.equal(framework.getConversationRouter(), null);
+      assert.deepEqual(deprecationWarnings(warn), []);
+    } finally {
+      warn.mock.restore();
+      await framework?.stop();
+    }
+  });
+
   it('DM message spawns a fork, routes the message there, and triggers inference', async () => {
     membrane.pushResponse(createMockResponse([{ type: 'text', text: 'Hi alice!' }]));
     const framework = await makeFramework();