diff --git a/docs/plugins/sdk-subpaths.md b/docs/plugins/sdk-subpaths.md
index 9580cfe58a9..26dd0c5ab1d 100644
--- a/docs/plugins/sdk-subpaths.md
+++ b/docs/plugins/sdk-subpaths.md
@@ -175,6 +175,8 @@ For the plugin authoring guide, see [Plugin SDK overview](/plugins/sdk-overview)
     | `plugin-sdk/runtime-env` | Narrow runtime env, logger, timeout, retry, and backoff helpers |
     | `plugin-sdk/browser-config` | Supported browser config facade for normalized profile/defaults, CDP URL parsing, and browser-control auth helpers |
     | `plugin-sdk/channel-runtime-context` | Generic channel runtime-context registration and lookup helpers |
+    | `plugin-sdk/matrix` | Deprecated Matrix compatibility facade for older third-party channel packages; new plugins should import `plugin-sdk/run-command` directly |
+    | `plugin-sdk/mattermost` | Deprecated Mattermost compatibility facade for older third-party channel packages; new plugins should import generic SDK subpaths directly |
     | `plugin-sdk/runtime-store` | `createPluginRuntimeStore` |
     | `plugin-sdk/plugin-runtime` | Shared plugin command/hook/http/interactive helpers |
     | `plugin-sdk/hook-runtime` | Shared webhook/internal hook pipeline helpers |
diff --git a/src/plugin-sdk/entrypoints.ts b/src/plugin-sdk/entrypoints.ts
index 41691005854..b63e85b1091 100644
--- a/src/plugin-sdk/entrypoints.ts
+++ b/src/plugin-sdk/entrypoints.ts
@@ -14,6 +14,8 @@ export const supportedBundledFacadeSdkEntrypoints = [
   "discord",
   "lmstudio",
   "lmstudio-runtime",
+  "matrix",
+  "mattermost",
   "memory-core-engine-runtime",
   "qa-runner-runtime",
   "telegram-account",