diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52698c9a182..ffd0b8e3cc3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -141,6 +141,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Gateway/sessions: clear cached skills snapshots during `/new` and `sessions.reset` so long-lived channel sessions rebuild the visible skill list after skills change. (#78873) Thanks @Evizero.
 - fix(auto-reply): gate inline skill tool dispatch [AI]. (#78517) Thanks @pgondhi987.
 - Canvas plugin: keep legacy root `canvasHost` configs valid until `openclaw doctor --fix` migrates them into `plugins.entries.canvas.config.host`, move Canvas/A2UI clients to gateway protocol v4 plugin surfaces, and refresh the generated A2UI bundle hash so normal builds stay clean.
 - feishu: honor config write policy for dynamic agents [AI]. (#78520) Thanks @pgondhi987.
diff --git a/src/auto-reply/reply/session.test.ts b/src/auto-reply/reply/session.test.ts
index 461ebef2f58..d044335915c 100644
--- a/src/auto-reply/reply/session.test.ts
+++ b/src/auto-reply/reply/session.test.ts
@@ -729,6 +729,54 @@ describe("initSessionState RawBody", () => {
     expect(result.triggerBodyNormalized).toBe("/NEW KeepThisCase");
   });
 
+  it("drops cached skills snapshot when /new rotates an existing session", async () => {
+    const root = await makeCaseDir("openclaw-rawbody-reset-skills-");
+    const storePath = path.join(root, "sessions.json");
+    const sessionKey = "agent:main:signal:direct:uuid:reset-skills";
+    const existingSessionId = "session-with-stale-skills";
+
+    await writeSessionStoreFast(storePath, {
+      [sessionKey]: {
+        sessionId: existingSessionId,
+        updatedAt: Date.now(),
+        systemSent: true,
+        skillsSnapshot: {
+          prompt: "<available_skills><skill><name>stale</name></skill></available_skills>",
+          skills: [{ name: "stale" }],
+          version: 0,
+        },
+      },
+    });
+
+    const cfg = {
+      session: {
+        store: storePath,
+        resetTriggers: ["/new"],
+      },
+    } as OpenClawConfig;
+
+    const result = await initSessionState({
+      ctx: {
+        RawBody: "/new continue",
+        ChatType: "direct",
+        SessionKey: sessionKey,
+      },
+      cfg,
+      commandAuthorized: true,
+    });
+
+    expect(result.isNewSession).toBe(true);
+    expect(result.resetTriggered).toBe(true);
+    expect(result.sessionId).not.toBe(existingSessionId);
+    expect(result.sessionEntry.skillsSnapshot).toBeUndefined();
+
+    const store = JSON.parse(await fs.readFile(storePath, "utf-8")) as Record<
+      string,
+      { skillsSnapshot?: unknown }
+    >;
+    expect(store[sessionKey]?.skillsSnapshot).toBeUndefined();
+  });
+
   it("drains stale system events when /new rotates an existing session", async () => {
     const root = await makeCaseDir("openclaw-rawbody-reset-system-events-");
     const storePath = path.join(root, "sessions.json");
diff --git a/src/auto-reply/reply/session.ts b/src/auto-reply/reply/session.ts
index cc2e31af08d..78b82029196 100644
--- a/src/auto-reply/reply/session.ts
+++ b/src/auto-reply/reply/session.ts
@@ -768,6 +768,9 @@ export async function initSessionState(params: {
     sessionEntry.outputTokens = undefined;
     sessionEntry.estimatedCostUsd = undefined;
     sessionEntry.contextTokens = undefined;
+    // Skills snapshots are prompt/runtime caches. Do not preserve a stale
+    // snapshot through /new; the next turn must rebuild the visible skill list.
+    sessionEntry.skillsSnapshot = undefined;
   }
   // Preserve per-session overrides while resetting compaction state on /new.
   sessionStore[sessionKey] = { ...sessionStore[sessionKey], ...sessionEntry };
diff --git a/src/gateway/server.sessions.reset-models.test.ts b/src/gateway/server.sessions.reset-models.test.ts
index bec49f0bb8c..5095540865f 100644
--- a/src/gateway/server.sessions.reset-models.test.ts
+++ b/src/gateway/server.sessions.reset-models.test.ts
@@ -50,6 +50,46 @@ test("sessions.reset recomputes model from defaults instead of stale runtime mod
   await expect(fs.stat(reset.payload?.entry.sessionFile as string)).resolves.toBeTruthy();
 });
 
+test("sessions.reset drops cached skills snapshot so /new rebuilds visible skills", async () => {
+  const { storePath } = await createSessionStoreDir();
+  testState.agentConfig = {
+    model: {
+      primary: "openai/gpt-test-a",
+    },
+  };
+
+  await writeSessionStore({
+    entries: {
+      main: sessionStoreEntry("sess-stale-skills", {
+        skillsSnapshot: {
+          prompt: "<available_skills><skill><name>stale</name></skill></available_skills>",
+          skills: [{ name: "stale" }],
+          version: 0,
+        },
+      }),
+    },
+  });
+
+  const reset = await directSessionReq<{
+    ok: true;
+    key: string;
+    entry: {
+      sessionId: string;
+      skillsSnapshot?: unknown;
+    };
+  }>("sessions.reset", { key: "main" });
+
+  expect(reset.ok).toBe(true);
+  expect(reset.payload?.entry.sessionId).not.toBe("sess-stale-skills");
+  expect(reset.payload?.entry.skillsSnapshot).toBeUndefined();
+
+  const store = JSON.parse(await fs.readFile(storePath, "utf-8")) as Record<
+    string,
+    { skillsSnapshot?: unknown }
+  >;
+  expect(store["agent:main:main"]?.skillsSnapshot).toBeUndefined();
+});
+
 test("sessions.reset preserves legacy explicit model overrides without modelOverrideSource", async () => {
   const { storePath } = await createSessionStoreDir();
   testState.agentConfig = {
diff --git a/src/gateway/session-reset-service.ts b/src/gateway/session-reset-service.ts
index d53b31491ba..69e7e7f7522 100644
--- a/src/gateway/session-reset-service.ts
+++ b/src/gateway/session-reset-service.ts
@@ -623,7 +623,10 @@ export async function performGatewaySessionReset(params: {
       lastTo: currentEntry?.lastTo,
       lastAccountId: currentEntry?.lastAccountId,
       lastThreadId: currentEntry?.lastThreadId,
-      skillsSnapshot: currentEntry?.skillsSnapshot,
+      // Do not carry the cached skills catalog across /new. Long-lived channel
+      // sessions (Signal DMs/groups in particular) otherwise keep advertising a
+      // stale <available_skills> block even after reset/restart, because the
+      // skills snapshot version is runtime-local and may reset to 0.
       acp: currentEntry?.acp,
       inputTokens: 0,
       outputTokens: 0,