diff --git a/README.md b/README.md
index 492cb8f..e73ae45 100644
--- a/README.md
+++ b/README.md
@@ -96,6 +96,9 @@ Then `openclaw gateway restart`.
   (create/replace; caller becomes sharer) · `update` (edit in place;
   sharer-only) · `close` (remove; sharer-only). `share` needs
   `title`/`format`(`md`|`html`|`text`)/`source`.
+- `fabric-channel` — channel membership; one tool, three `action`s:
+  `members` (list the channel's member userIds) · `join` (this agent
+  joins) · `leave` (this agent leaves).
 
 ## Install / build
 
diff --git a/dist/fabric/src/fabric-client.js b/dist/fabric/src/fabric-client.js
index 99a30af..46c74a2 100644
--- a/dist/fabric/src/fabric-client.js
+++ b/dist/fabric/src/fabric-client.js
@@ -68,6 +68,13 @@ export class FabricClient {
     joinChannel(guildEndpoint, guildToken, channelId) {
         return this.post(`${guildEndpoint}/api/channels/${channelId}/join`, {}, guildToken);
     }
+    leaveChannel(guildEndpoint, guildToken, channelId) {
+        return this.post(`${guildEndpoint}/api/channels/${channelId}/leave`, {}, guildToken);
+    }
+    // [{ userId, bypass }] — bypass is true only for discuss/work bypass-list
+    channelMembers(guildEndpoint, guildToken, channelId) {
+        return this.req('GET', `${guildEndpoint}/api/channels/${channelId}/members`, guildToken);
+    }
     // ---- channel canvas (one pinned doc per channel) ----
     canvasUrl(endpoint, channelId) {
         return `${endpoint}/api/channels/${channelId}/canvas`;
diff --git a/dist/fabric/src/tools.js b/dist/fabric/src/tools.js
index 80b1c52..04b03df 100644
--- a/dist/fabric/src/tools.js
+++ b/dist/fabric/src/tools.js
@@ -163,4 +163,43 @@ export function registerFabricTools(api, client, identity) {
             }
         },
     }));
+    // fabric-channel: channel membership (one tool, three actions).
+    api.registerTool((ctx) => ({
+        name: 'fabric-channel',
+        description: 'Channel membership. action: members (list channel member userIds) | ' +
+            'join (this agent joins the channel) | leave (this agent leaves).',
+        parameters: {
+            type: 'object',
+            additionalProperties: false,
+            required: ['action', 'guildNodeId', 'channelId'],
+            properties: {
+                action: { type: 'string', enum: ['members', 'join', 'leave'] },
+                guildNodeId: { type: 'string' },
+                channelId: { type: 'string' },
+            },
+        },
+        execute: async (p) => {
+            const agentId = ctx.agentId;
+            if (!agentId)
+                return { ok: false, error: 'no agent context' };
+            const { guild, token } = await ctxGuild(agentId, p.guildNodeId);
+            const ep = guild.endpoint;
+            switch (p.action) {
+                case 'members': {
+                    const members = await client.channelMembers(ep, token, p.channelId);
+                    return { ok: true, members };
+                }
+                case 'join': {
+                    await client.joinChannel(ep, token, p.channelId);
+                    return { ok: true, joined: true };
+                }
+                case 'leave': {
+                    await client.leaveChannel(ep, token, p.channelId);
+                    return { ok: true, left: true };
+                }
+                default:
+                    return { ok: false, error: `unknown action ${String(p.action)}` };
+            }
+        },
+    }));
 }
diff --git a/src/fabric-client.ts b/src/fabric-client.ts
index 6bae623..0a92bff 100644
--- a/src/fabric-client.ts
+++ b/src/fabric-client.ts
@@ -111,6 +111,23 @@ export class FabricClient {
     return this.post(`${guildEndpoint}/api/channels/${channelId}/join`, {}, guildToken);
   }
 
+  leaveChannel(guildEndpoint: string, guildToken: string, channelId: string): Promise<unknown> {
+    return this.post(`${guildEndpoint}/api/channels/${channelId}/leave`, {}, guildToken);
+  }
+
+  // [{ userId, bypass }] — bypass is true only for discuss/work bypass-list
+  channelMembers(
+    guildEndpoint: string,
+    guildToken: string,
+    channelId: string,
+  ): Promise<Array<{ userId: string; bypass?: boolean }>> {
+    return this.req(
+      'GET',
+      `${guildEndpoint}/api/channels/${channelId}/members`,
+      guildToken,
+    );
+  }
+
   // ---- channel canvas (one pinned doc per channel) ----
 
   private canvasUrl(endpoint: string, channelId: string): string {
diff --git a/src/tools.ts b/src/tools.ts
index 217db53..a69df24 100644
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -199,4 +199,48 @@ export function registerFabricTools(
       }
     },
   }));
+
+  // fabric-channel: channel membership (one tool, three actions).
+  api.registerTool((ctx: Ctx) => ({
+    name: 'fabric-channel',
+    description:
+      'Channel membership. action: members (list channel member userIds) | ' +
+      'join (this agent joins the channel) | leave (this agent leaves).',
+    parameters: {
+      type: 'object',
+      additionalProperties: false,
+      required: ['action', 'guildNodeId', 'channelId'],
+      properties: {
+        action: { type: 'string', enum: ['members', 'join', 'leave'] },
+        guildNodeId: { type: 'string' },
+        channelId: { type: 'string' },
+      },
+    },
+    execute: async (p: {
+      action: 'members' | 'join' | 'leave';
+      guildNodeId: string;
+      channelId: string;
+    }) => {
+      const agentId = ctx.agentId;
+      if (!agentId) return { ok: false, error: 'no agent context' };
+      const { guild, token } = await ctxGuild(agentId, p.guildNodeId);
+      const ep = guild.endpoint;
+      switch (p.action) {
+        case 'members': {
+          const members = await client.channelMembers(ep, token, p.channelId);
+          return { ok: true, members };
+        }
+        case 'join': {
+          await client.joinChannel(ep, token, p.channelId);
+          return { ok: true, joined: true };
+        }
+        case 'leave': {
+          await client.leaveChannel(ep, token, p.channelId);
+          return { ok: true, left: true };
+        }
+        default:
+          return { ok: false, error: `unknown action ${String(p.action)}` };
+      }
+    },
+  }));
 }