# s11: Autonomous Agents

> An idle cycle with task board polling lets teammates find and claim work themselves, with identity re-injection after context compression.

## The Problem

In s09-s10, teammates only work when explicitly told to. The lead must
spawn each teammate with a specific prompt. If the task board has 10
unclaimed tasks, the lead must manually assign each one. This does not
scale.

True autonomy means teammates find work themselves. When a teammate
finishes its current task, it should scan the task board for unclaimed
work, claim a task, and start working -- without any instruction from
the lead.

But autonomous agents face a subtlety: after context compression, the
agent might forget who it is. If the messages are summarized, the
original system prompt identity ("you are alice, role: coder") fades.
Identity re-injection solves this by inserting an identity block at the
start of compressed contexts.

Teaching simplification: the token estimation used here is rough
(characters / 4). Production systems use proper tokenizer libraries.
The nag threshold of 3 rounds (from s03) is set low for teaching
visibility; production agents typically use a higher threshold around 10.

## The Solution

```
Teammate lifecycle with idle cycle:

+-------+
| spawn |
+---+---+
    |
    v
+-------+   tool_use     +-------+
| WORK  | <------------- |  LLM  |
+---+---+                +-------+
    |
    | stop_reason != tool_use
    | (or idle tool called)
    v
+--------+
|  IDLE  |  poll every 5s for up to 60s
+---+----+
    |
    +---> check inbox --> message? ----------> WORK
    |
    +---> scan .tasks/ --> unclaimed? -------> claim -> WORK
    |
    +---> 60s timeout ----------------------> SHUTDOWN

Identity re-injection after compression:
  if len(messages) <= 3:
    messages.insert(0, identity_block)
    "You are 'alice', role: coder, team: my-team"
```

## How It Works

1. The teammate loop has two phases: WORK and IDLE. WORK runs the
   standard agent loop. When the LLM stops calling tools (or calls
   the `idle` tool), the teammate enters the IDLE phase.

```python
def _loop(self, name, role, prompt):
    while True:
        # -- WORK PHASE --
        messages = [{"role": "user", "content": prompt}]
        for _ in range(50):
            inbox = BUS.read_inbox(name)
            for msg in inbox:
                if msg.get("type") == "shutdown_request":
                    self._set_status(name, "shutdown")
                    return
                messages.append(...)
            response = client.messages.create(...)
            if response.stop_reason != "tool_use":
                break
            # execute tools...
            if idle_requested:
                break

        # -- IDLE PHASE --
        self._set_status(name, "idle")
        resume = self._idle_poll(name, messages)
        if not resume:
            self._set_status(name, "shutdown")
            return
        self._set_status(name, "working")
```

2. The idle phase polls the inbox and task board in a loop.

```python
def _idle_poll(self, name, messages):
    polls = IDLE_TIMEOUT // POLL_INTERVAL  # 60s / 5s = 12
    for _ in range(polls):
        time.sleep(POLL_INTERVAL)
        # Check inbox for new messages
        inbox = BUS.read_inbox(name)
        if inbox:
            messages.append({"role": "user",
                "content": f"<inbox>{inbox}</inbox>"})
            return True
        # Scan task board for unclaimed tasks
        unclaimed = scan_unclaimed_tasks()
        if unclaimed:
            task = unclaimed[0]
            claim_task(task["id"], name)
            messages.append({"role": "user",
                "content": f"<auto-claimed>Task #{task['id']}: "
                           f"{task['subject']}</auto-claimed>"})
            return True
    return False  # timeout -> shutdown
```

3. Task board scanning looks for pending, unowned, unblocked tasks.

```python
def scan_unclaimed_tasks() -> list:
    TASKS_DIR.mkdir(exist_ok=True)
    unclaimed = []
    for f in sorted(TASKS_DIR.glob("task_*.json")):
        task = json.loads(f.read_text())
        if (task.get("status") == "pending"
                and not task.get("owner")
                and not task.get("blockedBy")):
            unclaimed.append(task)
    return unclaimed

def claim_task(task_id: int, owner: str):
    path = TASKS_DIR / f"task_{task_id}.json"
    task = json.loads(path.read_text())
    task["status"] = "in_progress"
    task["owner"] = owner
    path.write_text(json.dumps(task, indent=2))
```

4. Identity re-injection inserts an identity block when the context
   is too short, indicating compression has occurred.

```python
def make_identity_block(name, role, team_name):
    return {"role": "user",
            "content": f"<identity>You are '{name}', "
                       f"role: {role}, team: {team_name}. "
                       f"Continue your work.</identity>"}

# Before resuming work after idle:
if len(messages) <= 3:
    messages.insert(0, make_identity_block(
        name, role, team_name))
    messages.insert(1, {"role": "assistant",
        "content": f"I am {name}. Continuing."})
```

5. The `idle` tool lets the teammate explicitly signal it has no more
   work, entering the idle polling phase early.

```python
{"name": "idle",
 "description": "Signal that you have no more work. "
                "Enters idle polling phase.",
 "input_schema": {"type": "object", "properties": {}}},
```

## Key Code

The autonomous loop (from `agents/s11_autonomous_agents.py`):

```python
def _loop(self, name, role, prompt):
    while True:
        # WORK PHASE
        for _ in range(50):
            response = client.messages.create(...)
            if response.stop_reason != "tool_use":
                break
            for block in response.content:
                if block.name == "idle":
                    idle_requested = True
            if idle_requested:
                break

        # IDLE PHASE
        self._set_status(name, "idle")
        for _ in range(IDLE_TIMEOUT // POLL_INTERVAL):
            time.sleep(POLL_INTERVAL)
            inbox = BUS.read_inbox(name)
            if inbox: resume = True; break
            unclaimed = scan_unclaimed_tasks()
            if unclaimed:
                claim_task(unclaimed[0]["id"], name)
                resume = True; break
        if not resume:
            self._set_status(name, "shutdown")
            return
        self._set_status(name, "working")
```

## What Changed From s10

| Component      | Before (s10)     | After (s11)                |
|----------------|------------------|----------------------------|
| Tools          | 12               | 14 (+idle, +claim_task)    |
| Autonomy       | Lead-directed    | Self-organizing            |
| Idle phase     | None             | Poll inbox + task board    |
| Task claiming  | Manual only      | Auto-claim unclaimed tasks |
| Identity       | System prompt    | + re-injection after compress|
| Timeout        | None             | 60s idle -> auto shutdown  |

## Design Rationale

Polling + timeout makes agents self-organizing without a central coordinator. Each agent independently polls the task board, claims unclaimed work, and returns to idle when done. The timeout triggers the poll cycle, and if no work appears within the window, the agent shuts itself down. This is the same pattern as work-stealing thread pools -- distributed, no single point of failure. Identity re-injection after compression ensures agents maintain their role even when conversation history is summarized away.

## Try It

```sh
cd learn-claude-code
python agents/s11_autonomous_agents.py
```

Example prompts to try:

1. `Create 3 tasks on the board, then spawn alice and bob. Watch them auto-claim.`
2. `Spawn a coder teammate and let it find work from the task board itself`
3. `Create tasks with dependencies. Watch teammates respect the blocked order.`
4. Type `/tasks` to see the task board with owners
5. Type `/team` to monitor who is working vs idle