diff --git a/docs/channels/matrix-js.md b/docs/channels/matrix-js.md
index c1a4ad262df..eb20345b9b8 100644
--- a/docs/channels/matrix-js.md
+++ b/docs/channels/matrix-js.md
@@ -242,7 +242,7 @@ Matrix-js supports native Matrix threads for both automatic replies and message-
 - Inbound threaded messages include the thread root message as extra agent context.
 - Message-tool sends now auto-inherit the current Matrix thread when the target is the same room, or the same DM user target, unless an explicit `threadId` is provided.
 - Runtime thread bindings are supported for Matrix-js. `/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`, and thread-bound `/acp spawn` now work in Matrix rooms and DMs.
-- Top-level Matrix room/DM `/focus` creates a new Matrix thread and binds it to the target session.
+- Top-level Matrix room/DM `/focus` creates a new Matrix thread and binds it to the target session when `threadBindings.spawnSubagentSessions=true`.
 - Running `/focus` or `/acp spawn --thread here` inside an existing Matrix thread binds that current thread instead.
 
 ### Thread Binding Config
@@ -255,7 +255,10 @@ Matrix-js inherits global defaults from `session.threadBindings`, and also suppo
 - `threadBindings.spawnSubagentSessions`
 - `threadBindings.spawnAcpSessions`
 
-For Matrix-js, spawn flags default to enabled unless you turn them off explicitly.
+Matrix-js thread-bound spawn flags are opt-in:
+
+- Set `threadBindings.spawnSubagentSessions: true` to allow top-level `/focus` to create and bind new Matrix threads.
+- Set `threadBindings.spawnAcpSessions: true` to allow `/acp spawn --thread auto|here` to bind ACP sessions to Matrix threads.
 
 ## Reactions
 
diff --git a/docs/gateway/configuration-reference.md b/docs/gateway/configuration-reference.md
index db5077aebcf..b832a9e062f 100644
--- a/docs/gateway/configuration-reference.md
+++ b/docs/gateway/configuration-reference.md
@@ -651,6 +651,7 @@ Run multiple accounts per channel (each with its own `accountId`):
 ### Other extension channels
 
 Many extension channels are configured as `channels.<id>` and documented in their dedicated channel pages (for example Feishu, Matrix, LINE, Nostr, Zalo, Nextcloud Talk, Synology Chat, and Twitch).
+Matrix-js also supports top-level `bindings[]` entries with `type: "acp"` for persistent ACP bindings. Use the Matrix room id or Matrix thread root event id in `match.peer.id`.
 See the full channel index: [Channels](/channels).
 
 ### Group chat mention gating
@@ -1358,7 +1359,7 @@ Run multiple isolated agents inside one Gateway. See [Multi-Agent](/concepts/mul
 
 Within each tier, the first matching `bindings` entry wins.
 
-For `type: "acp"` entries, OpenClaw resolves by exact conversation identity (`match.channel` + account + `match.peer.id`) and does not use the route binding tier order above.
+For `type: "acp"` entries, OpenClaw resolves by exact conversation identity (`match.channel` + account + `match.peer.id`) and does not use the route binding tier order above. For example, use a Discord channel/thread id, a Matrix room id or thread root event id, or a Telegram canonical topic id.
 
 ### Per-agent access profiles
 
diff --git a/docs/tools/acp-agents.md b/docs/tools/acp-agents.md
index 65a320f1c52..0e80c7a6216 100644
--- a/docs/tools/acp-agents.md
+++ b/docs/tools/acp-agents.md
@@ -79,6 +79,7 @@ Required feature flags for thread-bound ACP:
 - `acp.dispatch.enabled` is on by default (set `false` to pause ACP dispatch)
 - Channel-adapter ACP thread-spawn flag enabled (adapter-specific)
   - Discord: `channels.discord.threadBindings.spawnAcpSessions=true`
+  - Matrix-js: `channels["matrix-js"].threadBindings.spawnAcpSessions=true`
   - Telegram: `channels.telegram.threadBindings.spawnAcpSessions=true`
 
 ### Thread supporting channels
@@ -86,6 +87,7 @@ Required feature flags for thread-bound ACP:
 - Any channel adapter that exposes session/thread binding capability.
 - Current built-in support:
   - Discord threads/channels
+  - Matrix-js room threads and DMs
   - Telegram topics (forum topics in groups/supergroups and DM topics)
 - Plugin channels can add support through the same binding interface.
 
@@ -98,6 +100,7 @@ For non-ephemeral workflows, configure persistent ACP bindings in top-level `bin
 - `bindings[].type="acp"` marks a persistent ACP conversation binding.
 - `bindings[].match` identifies the target conversation:
   - Discord channel or thread: `match.channel="discord"` + `match.peer.id="<channelOrThreadId>"`
+  - Matrix room or thread: `match.channel="matrix-js"` + `match.peer.id="<roomIdOrThreadRootEventId>"`
   - Telegram forum topic: `match.channel="telegram"` + `match.peer.id="<chatId>:topic:<topicId>"`
 - `bindings[].agentId` is the owning OpenClaw agent id.
 - Optional ACP overrides live under `bindings[].acp`:
@@ -375,6 +378,7 @@ Notes:
 - On non-thread binding surfaces, default behavior is effectively `off`.
 - Thread-bound spawn requires channel policy support:
   - Discord: `channels.discord.threadBindings.spawnAcpSessions=true`
+  - Matrix-js: `channels["matrix-js"].threadBindings.spawnAcpSessions=true`
   - Telegram: `channels.telegram.threadBindings.spawnAcpSessions=true`
 
 ## ACP controls
@@ -475,7 +479,7 @@ Core ACP baseline:
 }
 ```
 
-Thread binding config is channel-adapter specific. Example for Discord:
+Thread binding config is channel-adapter specific. Example for Discord and Matrix-js:
 
 ```json5
 {
@@ -493,6 +497,12 @@ Thread binding config is channel-adapter specific. Example for Discord:
         spawnAcpSessions: true,
       },
     },
+    "matrix-js": {
+      threadBindings: {
+        enabled: true,
+        spawnAcpSessions: true,
+      },
+    },
   },
 }
 ```
@@ -500,6 +510,7 @@ Thread binding config is channel-adapter specific. Example for Discord:
 If thread-bound ACP spawn does not work, verify the adapter feature flag first:
 
 - Discord: `channels.discord.threadBindings.spawnAcpSessions=true`
+- Matrix-js: `channels["matrix-js"].threadBindings.spawnAcpSessions=true`
 
 See [Configuration Reference](/gateway/configuration-reference).
 
diff --git a/docs/tools/subagents.md b/docs/tools/subagents.md
index dabfc91dfc2..08a2917b598 100644
--- a/docs/tools/subagents.md
+++ b/docs/tools/subagents.md
@@ -99,7 +99,11 @@ When thread bindings are enabled for a channel, a sub-agent can stay bound to a
 
 ### Thread supporting channels
 
-- Discord (currently the only supported channel): supports persistent thread-bound subagent sessions (`sessions_spawn` with `thread: true`), manual thread controls (`/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`), and adapter keys `channels.discord.threadBindings.enabled`, `channels.discord.threadBindings.idleHours`, `channels.discord.threadBindings.maxAgeHours`, and `channels.discord.threadBindings.spawnSubagentSessions`.
+- `sessions_spawn` with `thread: true`: currently supported on Discord only.
+- Manual thread/conversation controls:
+  - Discord: `/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`
+  - Matrix-js: `/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`
+  - Telegram: `/focus`, `/unfocus`, `/agents`, `/session idle`, `/session max-age`
 
 Quick flow:
 
diff --git a/src/agents/acp-spawn.test.ts b/src/agents/acp-spawn.test.ts
index c53584cdf55..9d651803b6a 100644
--- a/src/agents/acp-spawn.test.ts
+++ b/src/agents/acp-spawn.test.ts
@@ -963,6 +963,18 @@ describe("spawnAcpDirect", () => {
   });
 
   it("keeps inline delivery for thread-bound ACP session mode", async () => {
+    hoisted.state.cfg = {
+      ...hoisted.state.cfg,
+      channels: {
+        ...hoisted.state.cfg.channels,
+        telegram: {
+          threadBindings: {
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    };
+
     const result = await spawnAcpDirect(
       {
         task: "Investigate flaky tests",
diff --git a/src/auto-reply/reply/commands-acp.test.ts b/src/auto-reply/reply/commands-acp.test.ts
index 7447419fd1e..cec949634b5 100644
--- a/src/auto-reply/reply/commands-acp.test.ts
+++ b/src/auto-reply/reply/commands-acp.test.ts
@@ -243,9 +243,10 @@ function createSessionBindingCapabilities() {
 type AcpBindInput = {
   targetSessionKey: string;
   conversation: {
-    channel?: "discord" | "telegram";
+    channel?: "discord" | "matrix-js" | "telegram";
     accountId: string;
     conversationId: string;
+    parentConversationId?: string;
   };
   placement: "current" | "child";
   metadata?: Record<string, unknown>;
@@ -266,11 +267,18 @@ function createAcpThreadBinding(input: AcpBindInput): FakeBinding {
             conversationId: nextConversationId,
             parentConversationId: "parent-1",
           }
-        : {
-            channel: "telegram",
-            accountId: input.conversation.accountId,
-            conversationId: nextConversationId,
-          },
+        : channel === "matrix-js"
+          ? {
+              channel: "matrix-js",
+              accountId: input.conversation.accountId,
+              conversationId: nextConversationId,
+              parentConversationId: input.conversation.parentConversationId ?? "!room:example",
+            }
+          : {
+              channel: "telegram",
+              accountId: input.conversation.accountId,
+              conversationId: nextConversationId,
+            },
     metadata: { boundBy, webhookId: "wh-1" },
   });
 }
@@ -334,6 +342,24 @@ function createTelegramDmParams(commandBody: string, cfg: OpenClawConfig = baseC
   return params;
 }
 
+function createMatrixRoomParams(commandBody: string, cfg: OpenClawConfig = baseCfg) {
+  const params = buildCommandTestParams(commandBody, cfg, {
+    Provider: "matrix-js",
+    Surface: "matrix-js",
+    OriginatingChannel: "matrix-js",
+    OriginatingTo: "room:!room:example",
+    AccountId: "default",
+  });
+  params.command.senderId = "user-1";
+  return params;
+}
+
+function createMatrixThreadParams(commandBody: string, cfg: OpenClawConfig = baseCfg) {
+  const params = createMatrixRoomParams(commandBody, cfg);
+  params.ctx.MessageThreadId = "$thread-42";
+  return params;
+}
+
 async function runDiscordAcpCommand(commandBody: string, cfg: OpenClawConfig = baseCfg) {
   return handleAcpCommand(createDiscordParams(commandBody, cfg), true);
 }
@@ -350,6 +376,14 @@ async function runTelegramDmAcpCommand(commandBody: string, cfg: OpenClawConfig
   return handleAcpCommand(createTelegramDmParams(commandBody, cfg), true);
 }
 
+async function runMatrixRoomAcpCommand(commandBody: string, cfg: OpenClawConfig = baseCfg) {
+  return handleAcpCommand(createMatrixRoomParams(commandBody, cfg), true);
+}
+
+async function runMatrixThreadAcpCommand(commandBody: string, cfg: OpenClawConfig = baseCfg) {
+  return handleAcpCommand(createMatrixThreadParams(commandBody, cfg), true);
+}
+
 describe("/acp command", () => {
   beforeEach(() => {
     acpManagerTesting.resetAcpSessionManagerForTests();
@@ -518,7 +552,18 @@ describe("/acp command", () => {
   });
 
   it("binds Telegram topic ACP spawns to full conversation ids", async () => {
-    const result = await runTelegramAcpCommand("/acp spawn codex --thread here");
+    const cfg = {
+      ...baseCfg,
+      channels: {
+        ...baseCfg.channels,
+        telegram: {
+          threadBindings: {
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+    const result = await runTelegramAcpCommand("/acp spawn codex --thread here", cfg);
 
     expect(result?.reply?.text).toContain("Spawned ACP session agent:codex:acp:");
     expect(result?.reply?.text).toContain("Bound this conversation to");
@@ -536,7 +581,18 @@ describe("/acp command", () => {
   });
 
   it("binds Telegram DM ACP spawns to the DM conversation id", async () => {
-    const result = await runTelegramDmAcpCommand("/acp spawn codex --thread here");
+    const cfg = {
+      ...baseCfg,
+      channels: {
+        ...baseCfg.channels,
+        telegram: {
+          threadBindings: {
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+    const result = await runTelegramDmAcpCommand("/acp spawn codex --thread here", cfg);
 
     expect(result?.reply?.text).toContain("Spawned ACP session agent:codex:acp:");
     expect(result?.reply?.text).toContain("Bound this conversation to");
@@ -592,6 +648,47 @@ describe("/acp command", () => {
     );
   });
 
+  it("rejects Matrix thread-bound ACP spawn when spawnAcpSessions is not enabled", async () => {
+    const result = await runMatrixRoomAcpCommand("/acp spawn codex --thread auto");
+
+    expect(result?.reply?.text).toContain(
+      "channels.matrix-js.threadBindings.spawnAcpSessions=true",
+    );
+    expect(hoisted.closeMock).toHaveBeenCalledTimes(1);
+    expect(hoisted.sessionBindingBindMock).not.toHaveBeenCalled();
+  });
+
+  it("binds Matrix thread-bound ACP spawns when enabled explicitly", async () => {
+    const cfg = {
+      ...baseCfg,
+      channels: {
+        ...baseCfg.channels,
+        "matrix-js": {
+          threadBindings: {
+            enabled: true,
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+
+    const result = await runMatrixThreadAcpCommand("/acp spawn codex --thread here", cfg);
+
+    expect(result?.reply?.text).toContain("Spawned ACP session agent:codex:acp:");
+    expect(result?.reply?.text).toContain("Bound this thread to");
+    expect(hoisted.sessionBindingBindMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        placement: "current",
+        conversation: expect.objectContaining({
+          channel: "matrix-js",
+          accountId: "default",
+          conversationId: "$thread-42",
+          parentConversationId: "!room:example",
+        }),
+      }),
+    );
+  });
+
   it("forbids /acp spawn from sandboxed requester sessions", async () => {
     const cfg = {
       ...baseCfg,
diff --git a/src/auto-reply/reply/commands-acp/lifecycle.ts b/src/auto-reply/reply/commands-acp/lifecycle.ts
index 564788f78d7..8cb880381b9 100644
--- a/src/auto-reply/reply/commands-acp/lifecycle.ts
+++ b/src/auto-reply/reply/commands-acp/lifecycle.ts
@@ -157,6 +157,9 @@ async function bindSpawnedAcpSessionToThread(params: {
       channel: spawnPolicy.channel,
       accountId: spawnPolicy.accountId,
       conversationId: currentConversationId,
+      ...(bindingContext.parentConversationId
+        ? { parentConversationId: bindingContext.parentConversationId }
+        : {}),
     });
     const boundBy =
       typeof existingBinding?.metadata?.boundBy === "string"
@@ -181,6 +184,9 @@ async function bindSpawnedAcpSessionToThread(params: {
         channel: spawnPolicy.channel,
         accountId: spawnPolicy.accountId,
         conversationId,
+        ...(bindingContext.parentConversationId
+          ? { parentConversationId: bindingContext.parentConversationId }
+          : {}),
       },
       placement,
       metadata: {
diff --git a/src/auto-reply/reply/commands-subagents-focus.test.ts b/src/auto-reply/reply/commands-subagents-focus.test.ts
index b118bf99793..13b904bfec6 100644
--- a/src/auto-reply/reply/commands-subagents-focus.test.ts
+++ b/src/auto-reply/reply/commands-subagents-focus.test.ts
@@ -105,8 +105,8 @@ function createTelegramTopicCommandParams(commandBody: string) {
   return params;
 }
 
-function createMatrixCommandParams(commandBody: string) {
-  const params = buildCommandTestParams(commandBody, baseCfg, {
+function createMatrixCommandParams(commandBody: string, cfg: OpenClawConfig = baseCfg) {
+  const params = buildCommandTestParams(commandBody, cfg, {
     Provider: "matrix-js",
     Surface: "matrix-js",
     OriginatingChannel: "matrix-js",
@@ -236,7 +236,17 @@ describe("/focus, /unfocus, /agents", () => {
   });
 
   it("/focus creates Matrix child thread bindings from top-level rooms", async () => {
-    const result = await focusCodexAcp(createMatrixCommandParams("/focus codex-acp"));
+    const cfg = {
+      ...baseCfg,
+      channels: {
+        "matrix-js": {
+          threadBindings: {
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+    const result = await focusCodexAcp(createMatrixCommandParams("/focus codex-acp", cfg));
 
     expect(result?.reply?.text).toContain("created thread");
     expect(hoisted.sessionBindingBindMock).toHaveBeenCalledWith(
@@ -251,6 +261,15 @@ describe("/focus, /unfocus, /agents", () => {
     );
   });
 
+  it("/focus rejects Matrix child thread creation when spawn config is not enabled", async () => {
+    const result = await focusCodexAcp(createMatrixCommandParams("/focus codex-acp"));
+
+    expect(result?.reply?.text).toContain(
+      "channels.matrix-js.threadBindings.spawnAcpSessions=true",
+    );
+    expect(hoisted.sessionBindingBindMock).not.toHaveBeenCalled();
+  });
+
   it("/focus includes ACP session identifiers in intro text when available", async () => {
     hoisted.readAcpSessionEntryMock.mockReturnValue({
       sessionKey: "agent:codex-acp:session-1",
diff --git a/src/auto-reply/reply/commands-subagents/action-focus.ts b/src/auto-reply/reply/commands-subagents/action-focus.ts
index 79da5ca5dc9..425ba7bca49 100644
--- a/src/auto-reply/reply/commands-subagents/action-focus.ts
+++ b/src/auto-reply/reply/commands-subagents/action-focus.ts
@@ -8,8 +8,10 @@ import {
   resolveThreadBindingThreadName,
 } from "../../../channels/thread-bindings-messages.js";
 import {
+  formatThreadBindingSpawnDisabledError,
   resolveThreadBindingIdleTimeoutMsForChannel,
   resolveThreadBindingMaxAgeMsForChannel,
+  resolveThreadBindingSpawnPolicy,
 } from "../../../channels/thread-bindings-policy.js";
 import { getSessionBindingService } from "../../../infra/outbound/session-binding-service.js";
 import type { CommandHandlerResult } from "../commands-types.js";
@@ -183,6 +185,23 @@ export async function handleSubagentsFocusAction(
   if (!capabilities.placements.includes(bindingContext.placement)) {
     return stopWithText(`⚠️ ${channel} bindings are unavailable for this account.`);
   }
+  if (bindingContext.channel === "matrix-js" && bindingContext.placement === "child") {
+    const spawnPolicy = resolveThreadBindingSpawnPolicy({
+      cfg: params.cfg,
+      channel: bindingContext.channel,
+      accountId,
+      kind: focusTarget.targetKind === "acp" ? "acp" : "subagent",
+    });
+    if (!spawnPolicy.spawnEnabled) {
+      return stopWithText(
+        `⚠️ ${formatThreadBindingSpawnDisabledError({
+          channel: spawnPolicy.channel,
+          accountId: spawnPolicy.accountId,
+          kind: focusTarget.targetKind === "acp" ? "acp" : "subagent",
+        })}`,
+      );
+    }
+  }
 
   let binding;
   try {
diff --git a/src/channels/thread-bindings-policy.test.ts b/src/channels/thread-bindings-policy.test.ts
new file mode 100644
index 00000000000..890fb22d393
--- /dev/null
+++ b/src/channels/thread-bindings-policy.test.ts
@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../config/config.js";
+import { resolveThreadBindingSpawnPolicy } from "./thread-bindings-policy.js";
+
+const baseCfg = {
+  session: { mainKey: "main", scope: "per-sender" },
+} satisfies OpenClawConfig;
+
+describe("resolveThreadBindingSpawnPolicy", () => {
+  it("defaults thread-bound spawns to opt-in across supported channels", () => {
+    expect(
+      resolveThreadBindingSpawnPolicy({
+        cfg: baseCfg,
+        channel: "discord",
+        kind: "subagent",
+      }).spawnEnabled,
+    ).toBe(false);
+    expect(
+      resolveThreadBindingSpawnPolicy({
+        cfg: baseCfg,
+        channel: "matrix-js",
+        kind: "subagent",
+      }).spawnEnabled,
+    ).toBe(false);
+    expect(
+      resolveThreadBindingSpawnPolicy({
+        cfg: baseCfg,
+        channel: "telegram",
+        kind: "acp",
+      }).spawnEnabled,
+    ).toBe(false);
+  });
+
+  it("honors explicit per-channel spawn flags", () => {
+    const cfg = {
+      ...baseCfg,
+      channels: {
+        "matrix-js": {
+          threadBindings: {
+            spawnSubagentSessions: true,
+            spawnAcpSessions: true,
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+
+    expect(
+      resolveThreadBindingSpawnPolicy({
+        cfg,
+        channel: "matrix-js",
+        kind: "subagent",
+      }).spawnEnabled,
+    ).toBe(true);
+    expect(
+      resolveThreadBindingSpawnPolicy({
+        cfg,
+        channel: "matrix-js",
+        kind: "acp",
+      }).spawnEnabled,
+    ).toBe(true);
+  });
+});
diff --git a/src/channels/thread-bindings-policy.ts b/src/channels/thread-bindings-policy.ts
index 15f3f5557fe..3334ecaea03 100644
--- a/src/channels/thread-bindings-policy.ts
+++ b/src/channels/thread-bindings-policy.ts
@@ -2,6 +2,8 @@ import type { OpenClawConfig } from "../config/config.js";
 import { normalizeAccountId } from "../routing/session-key.js";
 
 export const DISCORD_THREAD_BINDING_CHANNEL = "discord";
+export const MATRIX_JS_THREAD_BINDING_CHANNEL = "matrix-js";
+export const TELEGRAM_THREAD_BINDING_CHANNEL = "telegram";
 const DEFAULT_THREAD_BINDING_IDLE_HOURS = 24;
 const DEFAULT_THREAD_BINDING_MAX_AGE_HOURS = 0;
 
@@ -106,6 +108,22 @@ function resolveSpawnFlagKey(
   return kind === "subagent" ? "spawnSubagentSessions" : "spawnAcpSessions";
 }
 
+function resolveSpawnConfigPath(params: {
+  channel: string;
+  kind: ThreadBindingSpawnKind;
+}): string | undefined {
+  const suffix =
+    params.kind === "subagent" ? "spawnSubagentSessions=true" : "spawnAcpSessions=true";
+  if (
+    params.channel === DISCORD_THREAD_BINDING_CHANNEL ||
+    params.channel === MATRIX_JS_THREAD_BINDING_CHANNEL ||
+    params.channel === TELEGRAM_THREAD_BINDING_CHANNEL
+  ) {
+    return `channels.${params.channel}.threadBindings.${suffix}`;
+  }
+  return undefined;
+}
+
 export function resolveThreadBindingSpawnPolicy(params: {
   cfg: OpenClawConfig;
   channel: string;
@@ -127,8 +145,7 @@ export function resolveThreadBindingSpawnPolicy(params: {
   const spawnFlagKey = resolveSpawnFlagKey(params.kind);
   const spawnEnabledRaw =
     normalizeBoolean(account?.[spawnFlagKey]) ?? normalizeBoolean(root?.[spawnFlagKey]);
-  // Non-Discord channels currently have no dedicated spawn gate config keys.
-  const spawnEnabled = spawnEnabledRaw ?? channel !== DISCORD_THREAD_BINDING_CHANNEL;
+  const spawnEnabled = spawnEnabledRaw ?? false;
   return {
     channel,
     accountId,
@@ -191,11 +208,21 @@ export function formatThreadBindingSpawnDisabledError(params: {
   accountId: string;
   kind: ThreadBindingSpawnKind;
 }): string {
-  if (params.channel === DISCORD_THREAD_BINDING_CHANNEL && params.kind === "acp") {
-    return "Discord thread-bound ACP spawns are disabled for this account (set channels.discord.threadBindings.spawnAcpSessions=true to enable).";
-  }
-  if (params.channel === DISCORD_THREAD_BINDING_CHANNEL && params.kind === "subagent") {
-    return "Discord thread-bound subagent spawns are disabled for this account (set channels.discord.threadBindings.spawnSubagentSessions=true to enable).";
+  const configPath = resolveSpawnConfigPath({
+    channel: params.channel,
+    kind: params.kind,
+  });
+  const label =
+    params.channel === DISCORD_THREAD_BINDING_CHANNEL
+      ? "Discord"
+      : params.channel === MATRIX_JS_THREAD_BINDING_CHANNEL
+        ? "Matrix-js"
+        : params.channel === TELEGRAM_THREAD_BINDING_CHANNEL
+          ? "Telegram"
+          : params.channel;
+  if (configPath) {
+    const noun = params.kind === "acp" ? "ACP" : "subagent";
+    return `${label} thread-bound ${noun} spawns are disabled for this account (set ${configPath} to enable).`;
   }
   return `Thread-bound ${params.kind} spawns are disabled for ${params.channel}.`;
 }
diff --git a/src/config/schema.help.ts b/src/config/schema.help.ts
index 085c5b407d9..d711ee7c382 100644
--- a/src/config/schema.help.ts
+++ b/src/config/schema.help.ts
@@ -1550,9 +1550,9 @@ export const FIELD_HELP: Record<string, string> = {
   "channels.matrix-js.threadBindings.maxAgeHours":
     "Optional hard max age in hours for Matrix-js thread-bound sessions. Set 0 to disable hard cap (default: 0). Overrides session.threadBindings.maxAgeHours when set.",
   "channels.matrix-js.threadBindings.spawnSubagentSessions":
-    "Allow subagent spawns/focus flows to auto-create and bind Matrix threads when starting from a top-level Matrix room or DM.",
+    "Allow top-level /focus flows to auto-create and bind Matrix threads for subagent/session targets (default: false; opt-in). Set true to enable Matrix thread creation/binding from room or DM contexts.",
   "channels.matrix-js.threadBindings.spawnAcpSessions":
-    "Allow /acp spawn to auto-create and bind Matrix threads for ACP sessions when starting from a top-level Matrix room or DM.",
+    "Allow /acp spawn to create or bind Matrix threads for ACP sessions (default: false; opt-in). Set true to enable thread-bound ACP spawns for this account/channel.",
   "channels.discord.ui.components.accentColor":
     "Accent color for Discord component containers (hex). Set per account via channels.discord.accounts.<id>.ui.components.accentColor.",
   "channels.discord.voice.enabled":