diff --git a/docs/tools/lobster.md b/docs/tools/lobster.md
new file mode 100644
index 000000000..bb3f4d130
--- /dev/null
+++ b/docs/tools/lobster.md
@@ -0,0 +1,109 @@
+---
+title: Lobster
+description: Typed workflow runtime for Clawdbot — composable pipelines with approval gates.
+---
+
+# Lobster
+
+Lobster is a workflow shell that lets Clawdbot run multi-step tool sequences as a single, deterministic operation with explicit approval checkpoints.
+
+## Why
+
+Today, complex workflows require many back-and-forth tool calls. Each call costs tokens, and the LLM has to orchestrate every step. Lobster moves that orchestration into a typed runtime:
+
+- **One call instead of many**: Clawdbot calls `lobster.run(...)` once and gets a structured result.
+- **Approvals built in**: Side effects (send email, post comment) halt the workflow until explicitly approved.
+- **Resumable**: Halted workflows return a token; approve and resume without re-running everything.
+
+## Example: Email triage
+
+Without Lobster:
+```
+User: "Check my email and draft replies"
+→ clawd calls gmail.list
+→ LLM summarizes
+→ User: "draft replies to #2 and #5"
+→ LLM drafts
+→ User: "send #2"
+→ clawd calls gmail.send
+(repeat daily, no memory of what was triaged)
+```
+
+With Lobster:
+```
+clawd calls: lobster.run("email.triage --limit 20")
+
+Returns:
+{
+  "status": "needs_approval",
+  "output": {
+    "summary": "5 need replies, 2 need action",
+    "drafts": [...]
+  },
+  "requiresApproval": {
+    "prompt": "Send 2 draft replies?",
+    "resumeToken": "..."
+  }
+}
+
+User approves → clawd calls: lobster.resume(token, approve: true)
+→ Emails sent
+```
+
+One workflow. Deterministic. Safe.
+
+## Enable
+
+Lobster is an **optional** plugin tool. Enable it in your agent config:
+
+```json
+{
+  "agents": {
+    "list": [{
+      "id": "main",
+      "tools": {
+        "allow": ["lobster"]
+      }
+    }]
+  }
+}
+```
+
+You also need the `lobster` CLI installed locally.
+
+## Actions
+
+### `run`
+
+Execute a Lobster pipeline in tool mode.
+
+```json
+{
+  "action": "run",
+  "pipeline": "gog.gmail.search --query 'newer_than:1d' | email.triage",
+  "timeoutMs": 30000
+}
+```
+
+### `resume`
+
+Continue a halted workflow after approval.
+
+```json
+{
+  "action": "resume",
+  "token": "<resumeToken>",
+  "approve": true
+}
+```
+
+## Security
+
+- **Local subprocess only** — no network calls from the plugin itself.
+- **No secrets** — Lobster doesn't manage OAuth; it calls clawd tools that do.
+- **Sandbox-aware** — disabled when `ctx.sandboxed` is true.
+- **Hardened** — `lobsterPath` must be absolute if specified; timeouts and output caps enforced.
+
+## Learn more
+
+- [Lobster repo](https://github.com/vignesh07/lobster) — runtime, commands, and workflow examples.
diff --git a/extensions/lobster/README.md b/extensions/lobster/README.md
new file mode 100644
index 000000000..13e675b45
--- /dev/null
+++ b/extensions/lobster/README.md
@@ -0,0 +1,38 @@
+# Lobster (plugin)
+
+Adds the `lobster` agent tool as an **optional** plugin tool.
+
+## What this is
+
+- Lobster is a standalone workflow shell (typed JSON-first pipelines + approvals/resume).
+- This plugin integrates Lobster with Clawdbot *without core changes*.
+
+## Enable
+
+Because this tool can trigger side effects (via workflows), it is registered with `optional: true`.
+
+Enable it in an agent allowlist:
+
+```json
+{
+  "agents": {
+    "list": [
+      {
+        "id": "main",
+        "tools": {
+          "allow": [
+            "lobster" // plugin id (enables all tools from this plugin)
+          ]
+        }
+      }
+    ]
+  }
+}
+```
+
+## Security
+
+- Runs the `lobster` executable as a local subprocess.
+- Does not manage OAuth/tokens.
+- Uses timeouts, stdout caps, and strict JSON envelope parsing.
+- Prefer an absolute `lobsterPath` in production to avoid PATH hijack.
diff --git a/extensions/lobster/SKILL.md b/extensions/lobster/SKILL.md
new file mode 100644
index 000000000..12c4f77ec
--- /dev/null
+++ b/extensions/lobster/SKILL.md
@@ -0,0 +1,90 @@
+# Lobster
+
+Lobster executes multi-step workflows with approval checkpoints. Use it when:
+
+- User wants a repeatable automation (triage, monitor, sync)
+- Actions need human approval before executing (send, post, delete)
+- Multiple tool calls should run as one deterministic operation
+
+## When to use Lobster
+
+| User intent | Use Lobster? |
+|-------------|--------------|
+| "Triage my email" | Yes — multi-step, may send replies |
+| "Send a message" | No — single action, use message tool directly |
+| "Check my email every morning and ask before replying" | Yes — scheduled workflow with approval |
+| "What's the weather?" | No — simple query |
+| "Monitor this PR and notify me of changes" | Yes — stateful, recurring |
+
+## Basic usage
+
+### Run a pipeline
+
+```json
+{
+  "action": "run",
+  "pipeline": "gog.gmail.search --query 'newer_than:1d' --max 20 | email.triage"
+}
+```
+
+Returns structured result:
+```json
+{
+  "protocolVersion": 1,
+  "ok": true,
+  "status": "ok",
+  "output": [{ "summary": {...}, "items": [...] }],
+  "requiresApproval": null
+}
+```
+
+### Handle approval
+
+If the workflow needs approval:
+```json
+{
+  "status": "needs_approval",
+  "output": [],
+  "requiresApproval": {
+    "prompt": "Send 3 draft replies?",
+    "items": [...],
+    "resumeToken": "..."
+  }
+}
+```
+
+Present the prompt to the user. If they approve:
+```json
+{
+  "action": "resume",
+  "token": "<resumeToken>",
+  "approve": true
+}
+```
+
+## Example workflows
+
+### Email triage
+```
+gog.gmail.search --query 'newer_than:1d' --max 20 | email.triage
+```
+Fetches recent emails, classifies into buckets (needs_reply, needs_action, fyi).
+
+### Email triage with approval gate
+```
+gog.gmail.search --query 'newer_than:1d' | email.triage | approve --prompt 'Process these?'
+```
+Same as above, but halts for approval before returning.
+
+## Key behaviors
+
+- **Deterministic**: Same input → same output (no LLM variance in pipeline execution)
+- **Approval gates**: `approve` command halts execution, returns token
+- **Resumable**: Use `resume` action with token to continue
+- **Structured output**: Always returns JSON envelope with `protocolVersion`
+
+## Don't use Lobster for
+
+- Simple single-action requests (just use the tool directly)
+- Queries that need LLM interpretation mid-flow
+- One-off tasks that won't be repeated
diff --git a/extensions/lobster/index.ts b/extensions/lobster/index.ts
new file mode 100644
index 000000000..5f459c939
--- /dev/null
+++ b/extensions/lobster/index.ts
@@ -0,0 +1,13 @@
+import type { ClawdbotPluginApi } from "../../src/plugins/types.js";
+
+import { createLobsterTool } from "./src/lobster-tool.js";
+
+export default function register(api: ClawdbotPluginApi) {
+  api.registerTool(
+    (ctx) => {
+      if (ctx.sandboxed) return null;
+      return createLobsterTool(api);
+    },
+    { optional: true },
+  );
+}
diff --git a/extensions/lobster/package.json b/extensions/lobster/package.json
new file mode 100644
index 000000000..606975434
--- /dev/null
+++ b/extensions/lobster/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@clawdbot/lobster",
+  "version": "2026.1.17-1",
+  "type": "module",
+  "description": "Lobster workflow tool plugin (typed pipelines + resumable approvals)",
+  "clawdbot": {
+    "extensions": ["./index.ts"]
+  }
+}
diff --git a/extensions/lobster/src/lobster-tool.test.ts b/extensions/lobster/src/lobster-tool.test.ts
new file mode 100644
index 000000000..1c69b3280
--- /dev/null
+++ b/extensions/lobster/src/lobster-tool.test.ts
@@ -0,0 +1,112 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+
+import { describe, expect, it } from "vitest";
+
+import type { ClawdbotPluginApi, ClawdbotPluginToolContext } from "../../../src/plugins/types.js";
+import { createLobsterTool } from "./lobster-tool.js";
+
+async function writeFakeLobster(params: {
+  payload: unknown;
+}) {
+  const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-lobster-plugin-"));
+  const binPath = path.join(dir, "lobster");
+
+  const file = `#!/usr/bin/env node\n` +
+    `process.stdout.write(JSON.stringify(${JSON.stringify(params.payload)}));\n`;
+
+  await fs.writeFile(binPath, file, { encoding: "utf8", mode: 0o755 });
+  return { dir, binPath };
+}
+
+function fakeApi(): ClawdbotPluginApi {
+  return {
+    id: "lobster",
+    name: "lobster",
+    source: "test",
+    config: {} as any,
+    runtime: { version: "test" } as any,
+    logger: { info() {}, warn() {}, error() {}, debug() {} },
+    registerTool() {},
+    registerHttpHandler() {},
+    registerChannel() {},
+    registerGatewayMethod() {},
+    registerCli() {},
+    registerService() {},
+    registerProvider() {},
+    resolvePath: (p) => p,
+  };
+}
+
+function fakeCtx(overrides: Partial<ClawdbotPluginToolContext> = {}): ClawdbotPluginToolContext {
+  return {
+    config: {} as any,
+    workspaceDir: "/tmp",
+    agentDir: "/tmp",
+    agentId: "main",
+    sessionKey: "main",
+    messageChannel: undefined,
+    agentAccountId: undefined,
+    sandboxed: false,
+    ...overrides,
+  };
+}
+
+describe("lobster plugin tool", () => {
+  it("runs lobster and returns parsed envelope in details", async () => {
+    const fake = await writeFakeLobster({
+      payload: { ok: true, status: "ok", output: [{ hello: "world" }], requiresApproval: null },
+    });
+
+    const tool = createLobsterTool(fakeApi());
+    const res = await tool.execute("call1", {
+      action: "run",
+      pipeline: "noop",
+      lobsterPath: fake.binPath,
+      timeoutMs: 1000,
+    });
+
+    expect(res.details).toMatchObject({ ok: true, status: "ok" });
+  });
+
+  it("requires absolute lobsterPath when provided", async () => {
+    const tool = createLobsterTool(fakeApi());
+    await expect(
+      tool.execute("call2", {
+        action: "run",
+        pipeline: "noop",
+        lobsterPath: "./lobster",
+      }),
+    ).rejects.toThrow(/absolute path/);
+  });
+
+  it("rejects invalid JSON from lobster", async () => {
+    const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-lobster-plugin-bad-"));
+    const binPath = path.join(dir, "lobster");
+    await fs.writeFile(binPath, `#!/usr/bin/env node\nprocess.stdout.write('nope');\n`, {
+      encoding: "utf8",
+      mode: 0o755,
+    });
+
+    const tool = createLobsterTool(fakeApi());
+    await expect(
+      tool.execute("call3", {
+        action: "run",
+        pipeline: "noop",
+        lobsterPath: binPath,
+      }),
+    ).rejects.toThrow(/invalid JSON/);
+  });
+
+  it("can be gated off in sandboxed contexts", async () => {
+    const api = fakeApi();
+    const factoryTool = (ctx: ClawdbotPluginToolContext) => {
+      if (ctx.sandboxed) return null;
+      return createLobsterTool(api);
+    };
+
+    expect(factoryTool(fakeCtx({ sandboxed: true }))).toBeNull();
+    expect(factoryTool(fakeCtx({ sandboxed: false }))?.name).toBe("lobster");
+  });
+});
diff --git a/extensions/lobster/src/lobster-tool.ts b/extensions/lobster/src/lobster-tool.ts
new file mode 100644
index 000000000..2d76e0821
--- /dev/null
+++ b/extensions/lobster/src/lobster-tool.ts
@@ -0,0 +1,185 @@
+import { Type } from "@sinclair/typebox";
+import { spawn } from "node:child_process";
+import path from "node:path";
+
+import type { ClawdbotPluginApi } from "../../../src/plugins/types.js";
+
+type LobsterEnvelope =
+  | {
+      ok: true;
+      status: "ok" | "needs_approval" | "cancelled";
+      output: unknown[];
+      requiresApproval: null | {
+        type: "approval_request";
+        prompt: string;
+        items: unknown[];
+        resumeToken?: string;
+      };
+    }
+  | {
+      ok: false;
+      error: { type?: string; message: string };
+    };
+
+function resolveExecutablePath(lobsterPathRaw: string | undefined) {
+  const lobsterPath = lobsterPathRaw?.trim() || "lobster";
+  if (lobsterPath !== "lobster" && !path.isAbsolute(lobsterPath)) {
+    throw new Error("lobsterPath must be an absolute path (or omit to use PATH)");
+  }
+  return lobsterPath;
+}
+
+async function runLobsterSubprocess(params: {
+  execPath: string;
+  argv: string[];
+  cwd: string;
+  timeoutMs: number;
+  maxStdoutBytes: number;
+}) {
+  const { execPath, argv, cwd } = params;
+  const timeoutMs = Math.max(200, params.timeoutMs);
+  const maxStdoutBytes = Math.max(1024, params.maxStdoutBytes);
+
+  return await new Promise<{ stdout: string }>((resolve, reject) => {
+    const child = spawn(execPath, argv, {
+      cwd,
+      stdio: ["ignore", "pipe", "pipe"],
+      env: {
+        ...process.env,
+        LOBSTER_MODE: "tool",
+      },
+    });
+
+    let stdout = "";
+    let stdoutBytes = 0;
+    let stderr = "";
+
+    child.stdout?.setEncoding("utf8");
+    child.stderr?.setEncoding("utf8");
+
+    child.stdout?.on("data", (chunk) => {
+      const str = String(chunk);
+      stdoutBytes += Buffer.byteLength(str, "utf8");
+      if (stdoutBytes > maxStdoutBytes) {
+        try {
+          child.kill("SIGKILL");
+        } finally {
+          reject(new Error("lobster output exceeded maxStdoutBytes"));
+        }
+        return;
+      }
+      stdout += str;
+    });
+
+    child.stderr?.on("data", (chunk) => {
+      stderr += String(chunk);
+    });
+
+    const timer = setTimeout(() => {
+      try {
+        child.kill("SIGKILL");
+      } finally {
+        reject(new Error("lobster subprocess timed out"));
+      }
+    }, timeoutMs);
+
+    child.once("error", (err) => {
+      clearTimeout(timer);
+      reject(err);
+    });
+
+    child.once("exit", (code) => {
+      clearTimeout(timer);
+      if (code !== 0) {
+        reject(new Error(`lobster failed (${code ?? "?"}): ${stderr.trim() || stdout.trim()}`));
+        return;
+      }
+      resolve({ stdout });
+    });
+  });
+}
+
+function parseEnvelope(stdout: string): LobsterEnvelope {
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(stdout);
+  } catch {
+    throw new Error("lobster returned invalid JSON");
+  }
+
+  if (!parsed || typeof parsed !== "object") {
+    throw new Error("lobster returned invalid JSON envelope");
+  }
+
+  const ok = (parsed as { ok?: unknown }).ok;
+  if (ok === true || ok === false) {
+    return parsed as LobsterEnvelope;
+  }
+
+  throw new Error("lobster returned invalid JSON envelope");
+}
+
+export function createLobsterTool(api: ClawdbotPluginApi) {
+  return {
+    name: "lobster",
+    description:
+      "Run Lobster pipelines as a local-first workflow runtime (typed JSON envelope + resumable approvals).",
+    parameters: Type.Object({
+      // NOTE: Prefer string enums in tool schemas; some providers reject unions/anyOf.
+      action: Type.Unsafe<"run" | "resume">({ type: "string", enum: ["run", "resume"] }),
+      pipeline: Type.Optional(Type.String()),
+      token: Type.Optional(Type.String()),
+      approve: Type.Optional(Type.Boolean()),
+      lobsterPath: Type.Optional(Type.String()),
+      cwd: Type.Optional(Type.String()),
+      timeoutMs: Type.Optional(Type.Number()),
+      maxStdoutBytes: Type.Optional(Type.Number()),
+    }),
+    async execute(_id: string, params: Record<string, unknown>) {
+      const action = String(params.action || "").trim();
+      if (!action) throw new Error("action required");
+
+      const execPath = resolveExecutablePath(
+        typeof params.lobsterPath === "string" ? params.lobsterPath : undefined,
+      );
+      const cwd = typeof params.cwd === "string" && params.cwd.trim() ? params.cwd.trim() : process.cwd();
+      const timeoutMs = typeof params.timeoutMs === "number" ? params.timeoutMs : 20_000;
+      const maxStdoutBytes = typeof params.maxStdoutBytes === "number" ? params.maxStdoutBytes : 512_000;
+
+      const argv = (() => {
+        if (action === "run") {
+          const pipeline = typeof params.pipeline === "string" ? params.pipeline : "";
+          if (!pipeline.trim()) throw new Error("pipeline required");
+          return ["run", "--mode", "tool", pipeline];
+        }
+        if (action === "resume") {
+          const token = typeof params.token === "string" ? params.token : "";
+          if (!token.trim()) throw new Error("token required");
+          const approve = params.approve;
+          if (typeof approve !== "boolean") throw new Error("approve required");
+          return ["resume", "--token", token, "--approve", approve ? "yes" : "no"];
+        }
+        throw new Error(`Unknown action: ${action}`);
+      })();
+
+      if (api.runtime?.version && api.logger?.debug) {
+        api.logger.debug(`lobster plugin runtime=${api.runtime.version}`);
+      }
+
+      const { stdout } = await runLobsterSubprocess({
+        execPath,
+        argv,
+        cwd,
+        timeoutMs,
+        maxStdoutBytes,
+      });
+
+      const envelope = parseEnvelope(stdout);
+
+      return {
+        content: [{ type: "text", text: JSON.stringify(envelope, null, 2) }],
+        details: envelope,
+      };
+    },
+  };
+}