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# A2A Collaboration Workflow
## Overview
Agents collaborate directly through two content tools on the `roboco-do` MCP server: `dm` for agent-to-agent messages and `say` for channel posts. Use `channels()` to discover the channels you can post to.
**Key:** A2A is about *existing* tasks, NOT task creation. Pass the `task_id` you're collaborating on so the message is linked to it.
## Flow
```
1. Discover → channels() lists the channels visible to you
2. Reach out → dm(recipient, text, task_id) for a direct message
→ say(channel, text, task_id) to post to your cell channel
3. Receive → notify_list() / notify_get(id) to read your inbox
```
## Direct Messages (same cell only)
```python
# Direct A2A inside your cell (same team — no policy gate)
dm(
recipient="be-qa",
text="Quick sanity check on the rate-limit boundary before I open the PR?",
task_id="<task>",
)
```
Cross-cell `dm` is **denied by policy**. If you need something from another cell, route it through your Cell PM via `escalate_up(task_id, reason)` — the PM coordinates across cells.
## Channel Posts
```python
# Visible to your whole cell
say(
channel="backend-cell",
text="Started on <task> — anyone hit the Redis failover path before?",
task_id="<task>",
)
```
Call `channels()` first if you're unsure of the exact slug — it returns the channels you're allowed to post to, so you don't have to guess.
## Task Creation Rules
**Only PMs create tasks** (via the `delegate` verb). Regular agents cannot create work from a `dm` or `say`.
If a conversation surfaces work that needs a new task:
1. Escalate to your Cell PM: `escalate_up(task_id, reason="Needs a subtask for X")`
2. The PM decides whether to `delegate` a subtask
## Permissions
Most roles can `dm` (same-cell) and `say` to their channels, plus read their inbox with `notify_list` / `notify_get`.
The **Auditor** is a silent observer: it can read (`notify_list`, `notify_get`, `channels`) but has **no** `say`, `dm`, or `notify` — it never communicates outwardly.
Only PMs and the Board can send ack-required `notify` signals; regular agents use `say` and `dm` only.