diff --git a/src/cli/config-cli.test.ts b/src/cli/config-cli.test.ts
index 6e9cc07bf7e..c5eb8e4e237 100644
--- a/src/cli/config-cli.test.ts
+++ b/src/cli/config-cli.test.ts
@@ -613,6 +613,29 @@ describe("config cli", () => {
       );
     });
 
+    it("rejects invalid hook mapping channels in JSON dry-run mode", async () => {
+      const resolved: OpenClawConfig = {
+        gateway: { port: 18789 },
+      };
+      setSnapshot(resolved, resolved);
+
+      await expect(
+        runConfigCommand([
+          "config",
+          "set",
+          "hooks.mappings[0].channel",
+          '"not-a-real-channel"',
+          "--strict-json",
+          "--dry-run",
+        ]),
+      ).rejects.toThrow("__exit__:1");
+
+      expect(mockWriteConfigFile).not.toHaveBeenCalled();
+      expect(mockError).toHaveBeenCalledWith(
+        expect.stringContaining("unknown hook mapping channel: not-a-real-channel"),
+      );
+    });
+
     it("logs a dry-run note when value mode performs no validation checks", async () => {
       const resolved: OpenClawConfig = {
         gateway: { port: 18789 },
diff --git a/src/cli/config-cli.ts b/src/cli/config-cli.ts
index e7a94ae99ab..349b967ccf8 100644
--- a/src/cli/config-cli.ts
+++ b/src/cli/config-cli.ts
@@ -15,7 +15,7 @@ import {
   type SecretRef,
   type SecretRefSource,
 } from "../config/types.secrets.js";
-import { validateConfigObjectRaw } from "../config/validation.js";
+import { validateConfigObjectRawWithPlugins } from "../config/validation.js";
 import { SecretProviderSchema } from "../config/zod-schema.core.js";
 import { danger, info, success } from "../globals.js";
 import type { RuntimeEnv } from "../runtime.js";
@@ -920,7 +920,7 @@ function selectDryRunRefsForResolution(params: { refs: SecretRef[]; allowExecInD
 }
 
 function collectDryRunSchemaErrors(config: OpenClawConfig): ConfigSetDryRunError[] {
-  const validated = validateConfigObjectRaw(config);
+  const validated = validateConfigObjectRawWithPlugins(config);
   if (validated.ok) {
     return [];
   }
diff --git a/src/config/config.plugin-validation.test.ts b/src/config/config.plugin-validation.test.ts
index 42d473aed4e..05a85228550 100644
--- a/src/config/config.plugin-validation.test.ts
+++ b/src/config/config.plugin-validation.test.ts
@@ -471,6 +471,27 @@ describe("config plugin validation", () => {
     expect(res.ok).toBe(true);
   });
 
+  it("accepts built-in hook mapping channels without local channel config", async () => {
+    const res = validateInSuite({
+      agents: { list: [{ id: "pi" }] },
+      hooks: {
+        mappings: [{ channel: "discord" }],
+      },
+    });
+    expect(res.ok).toBe(true);
+  });
+
+  it("accepts discovered plugin hook mapping channels without channel config", async () => {
+    const res = validateInSuite({
+      agents: { list: [{ id: "pi" }] },
+      hooks: {
+        mappings: [{ channel: "bluebubbles" }],
+      },
+      plugins: { enabled: false, load: { paths: [bluebubblesPluginDir] } },
+    });
+    expect(res.ok).toBe(true);
+  });
+
   it("rejects unknown heartbeat targets", async () => {
     const res = validateInSuite({
       agents: {
diff --git a/src/config/types.hooks.ts b/src/config/types.hooks.ts
index 3c5f7a74f0e..19cd4461798 100644
--- a/src/config/types.hooks.ts
+++ b/src/config/types.hooks.ts
@@ -1,3 +1,6 @@
+import type { ChannelId } from "../channels/plugins/types.js";
+import type { InstallRecordBase } from "./types.installs.js";
+
 export type HookMappingMatch = {
   path?: string;
   source?: string;
@@ -22,17 +25,7 @@ export type HookMappingConfig = {
   deliver?: boolean;
   /** DANGEROUS: Disable external content safety wrapping for this hook. */
   allowUnsafeExternalContent?: boolean;
-  channel?:
-    | "last"
-    | "whatsapp"
-    | "telegram"
-    | "discord"
-    | "irc"
-    | "googlechat"
-    | "slack"
-    | "signal"
-    | "imessage"
-    | "msteams";
+  channel?: ChannelId | "last";
   to?: string;
   /** Override model for this hook (provider/model or alias). */
   model?: string;
@@ -139,4 +132,3 @@ export type HooksConfig = {
   /** Internal agent event hooks */
   internal?: InternalHooksConfig;
 };
-import type { InstallRecordBase } from "./types.installs.js";
diff --git a/src/config/validation.ts b/src/config/validation.ts
index 98a1fd29fc6..8db22418c5f 100644
--- a/src/config/validation.ts
+++ b/src/config/validation.ts
@@ -496,6 +496,54 @@ function validateConfigObjectWithPluginsBase(
     }
   }
 
+  const allowedHookChannels = new Set<string>(["last"]);
+  for (const channelId of CHANNEL_IDS) {
+    allowedHookChannels.add(channelId.toLowerCase());
+  }
+  const { registry: hookChannelRegistry } = ensureRegistry();
+  for (const record of hookChannelRegistry.plugins) {
+    for (const channelId of record.channels) {
+      const normalized = channelId.trim().toLowerCase();
+      if (normalized) {
+        allowedHookChannels.add(normalized);
+      }
+    }
+  }
+
+  const validateHookMappingChannel = (channel: unknown, path: string) => {
+    if (channel === undefined) {
+      return;
+    }
+    if (typeof channel !== "string") {
+      issues.push({ path, message: "hooks.mappings[].channel must be a string" });
+      return;
+    }
+    const trimmed = channel.trim();
+    if (!trimmed) {
+      issues.push({ path, message: "hooks.mappings[].channel must not be empty" });
+      return;
+    }
+    const normalized = normalizeChatChannelId(trimmed) ?? trimmed.toLowerCase();
+    if (normalized === "last") {
+      return;
+    }
+    if (!allowedHookChannels.has(normalized)) {
+      issues.push({ path, message: `unknown hook mapping channel: ${trimmed}` });
+    }
+  };
+
+  if (Array.isArray(config.hooks?.mappings)) {
+    for (const [index, mapping] of config.hooks.mappings.entries()) {
+      if (!mapping || typeof mapping !== "object") {
+        continue;
+      }
+      validateHookMappingChannel(
+        (mapping as { channel?: unknown }).channel,
+        `hooks.mappings.${index}.channel`,
+      );
+    }
+  }
+
   if (!hasExplicitPluginsConfig) {
     if (issues.length > 0) {
       return { ok: false, issues, warnings };
diff --git a/src/config/zod-schema.hooks.ts b/src/config/zod-schema.hooks.ts
index 57d617bbd6b..989cc9c8d06 100644
--- a/src/config/zod-schema.hooks.ts
+++ b/src/config/zod-schema.hooks.ts
@@ -49,19 +49,7 @@ export const HookMappingSchema = z
     textTemplate: z.string().optional(),
     deliver: z.boolean().optional(),
     allowUnsafeExternalContent: z.boolean().optional(),
-    channel: z
-      .union([
-        z.literal("last"),
-        z.literal("whatsapp"),
-        z.literal("telegram"),
-        z.literal("discord"),
-        z.literal("irc"),
-        z.literal("slack"),
-        z.literal("signal"),
-        z.literal("imessage"),
-        z.literal("msteams"),
-      ])
-      .optional(),
+    channel: z.string().optional(),
     to: z.string().optional(),
     model: z.string().optional(),
     thinking: z.string().optional(),