fix: apply Discord voice channel prompts

CHANGELOG.md

@@ -18,6 +18,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Discord/voice: apply per-channel Discord `systemPrompt` overrides to voice transcript turns by forwarding the trusted channel prompt through the voice agent run. Fixes #47095. Thanks @qearlyao.
 - Discord/voice: run voice-channel turns under a voice-output policy that hides the agent `tts` tool and asks for spoken reply text, so `/vc join` sessions synthesize and play agent replies instead of ending with `NO_REPLY`. Fixes #61536. Thanks @aounakram.
 - Plugins/runtime-deps: prune inactive same-package versioned runtime-deps roots after bundled dependency repair, so upgrades do not leave old `openclaw-<version>-<hash>` package caches behind after doctor runs. Thanks @vincentkoc.
 - Plugins/runtime-deps: prune legacy version-scoped plugin runtime-deps roots during bundled dependency repair and cover the path in Package Acceptance's upgrade-survivor matrix, so upgrades from 2026.4.x no longer leave stale per-plugin runtime trees after doctor runs. Thanks @vincentkoc.

docs/channels/discord.md

@@ -1063,6 +1063,7 @@ Notes:
 - `voice.tts` overrides `messages.tts` for voice playback only.
 - `voice.model` overrides the LLM used for Discord voice channel responses only. Leave it unset to inherit the routed agent model.
 - STT uses `tools.media.audio`; `voice.model` does not affect transcription.
+- Per-channel Discord `systemPrompt` overrides apply to voice transcript turns for that voice channel.
 - Voice transcript turns derive owner status from Discord `allowFrom` (or `dm.allowFrom`); non-owner speakers cannot access owner-only tools (for example `gateway` and `cron`).
 - Voice is enabled by default; set `channels.discord.voice.enabled=false` to disable voice runtime and the `GuildVoiceStates` gateway intent.
 - `channels.discord.intents.voiceStates` can explicitly override voice-state intent subscription. Leave it unset for the intent to follow `voice.enabled`.

extensions/discord/src/voice/access.test.ts

@@ -62,7 +62,8 @@ describe("authorizeDiscordVoiceIngress", () => {
       },
     });
 
-    expect(access).toEqual({ ok: true });
+    expect(access).toMatchObject({ ok: true });
+    expect(access.ok && access.channelConfig?.users).toEqual(["discord:u-owner"]);
   });
 
   it("allows slug-keyed guild configs when manager context only has guild name", async () => {
@@ -91,7 +92,7 @@ describe("authorizeDiscordVoiceIngress", () => {
       },
     });
 
-    expect(access).toEqual({ ok: true });
+    expect(access).toMatchObject({ ok: true });
   });
 
   it("allows wildcard guild configs when only the guild id is available", async () => {
@@ -119,7 +120,7 @@ describe("authorizeDiscordVoiceIngress", () => {
       },
     });
 
-    expect(access).toEqual({ ok: true });
+    expect(access).toMatchObject({ ok: true });
   });
 
   it("blocks commands when channel id is unavailable for an allowlisted channel", async () => {
@@ -211,6 +212,6 @@ describe("authorizeDiscordVoiceIngress", () => {
       },
     });
 
-    expect(access).toEqual({ ok: true });
+    expect(access).toMatchObject({ ok: true });
   });
 });

extensions/discord/src/voice/access.ts

@@ -6,6 +6,7 @@ import type { Guild } from "../internal/discord.js";
 import {
   isDiscordGroupAllowedByPolicy,
   resolveDiscordChannelConfigWithFallback,
+  type DiscordChannelConfigResolved,
   resolveDiscordGuildEntry,
   resolveDiscordMemberAccessState,
   resolveDiscordOwnerAccess,
@@ -30,7 +31,9 @@ export async function authorizeDiscordVoiceIngress(params: {
   memberRoleIds: string[];
   ownerAllowFrom?: string[];
   sender: { id: string; name?: string; tag?: string };
-}): Promise<{ ok: true } | { ok: false; message: string }> {
+}): Promise<
+  { ok: true; channelConfig?: DiscordChannelConfigResolved | null } | { ok: false; message: string }
+> {
   const groupPolicy =
     params.groupPolicy ??
     resolveOpenProviderRuntimeGroupPolicy({
@@ -116,6 +119,6 @@ export async function authorizeDiscordVoiceIngress(params: {
     authorizers,
     modeWhenAccessGroupsOff: "configured",
   })
-    ? { ok: true }
+    ? { ok: true, channelConfig }
     : { ok: false, message: "You are not authorized to use this command." };
 }

extensions/discord/src/voice/manager.e2e.test.ts

@@ -574,6 +574,44 @@ describe("DiscordVoiceManager", () => {
     );
   });
 
+  it("passes per-channel system prompt overrides to voice agent runs", async () => {
+    const client = createClient();
+    client.fetchMember.mockResolvedValue({
+      nickname: "Guest Nick",
+      user: {
+        id: "u-guest",
+        username: "guest",
+        globalName: "Guest",
+        discriminator: "4321",
+      },
+    });
+    const manager = createManager(
+      {
+        groupPolicy: "open",
+        guilds: {
+          g1: {
+            channels: {
+              "1001": {
+                systemPrompt: "  Use short voice replies.  ",
+              },
+            },
+          },
+        },
+      },
+      client,
+      {
+        commands: { useAccessGroups: false },
+      },
+    );
+    await processVoiceSegment(manager, "u-guest");
+
+    const commandArgs = agentCommandMock.mock.calls.at(-1)?.[0] as
+      | { extraSystemPrompt?: string }
+      | undefined;
+
+    expect(commandArgs?.extraSystemPrompt).toBe("Use short voice replies.");
+  });
+
   it("reuses speaker context cache for repeated segments from the same speaker", async () => {
     const client = createClient();
     client.fetchMember.mockResolvedValue({

extensions/discord/src/voice/segment.ts

@@ -6,6 +6,7 @@ import { createSubsystemLogger } from "openclaw/plugin-sdk/runtime-env";
 import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
 import { formatMention } from "../mentions.js";
 import { normalizeDiscordSlug } from "../monitor/allow-list.js";
+import { buildDiscordGroupSystemPrompt } from "../monitor/inbound-context.js";
 import { authorizeDiscordVoiceIngress } from "./access.js";
 import { formatVoiceIngressPrompt } from "./prompt.js";
 import { loadDiscordVoiceSdk } from "./sdk-runtime.js";
@@ -82,6 +83,7 @@ export async function processDiscordVoiceSegment(params: {
   );
 
   const prompt = formatVoiceIngressPrompt(transcript, speaker.label);
+  const extraSystemPrompt = buildDiscordGroupSystemPrompt(access.channelConfig);
   const modelOverride = normalizeOptionalString(params.discordConfig.voice?.model);
 
   const result = await agentCommandFromIngress(
@@ -91,6 +93,7 @@ export async function processDiscordVoiceSegment(params: {
       agentId: entry.route.agentId,
       messageChannel: "discord",
       messageProvider: DISCORD_VOICE_MESSAGE_PROVIDER,
+      extraSystemPrompt,
       senderIsOwner: speaker.senderIsOwner,
       allowModelOverride: Boolean(modelOverride),
       model: modelOverride,