Support "teammates"

From 2.1.32 release notes:
- Added research preview agent teams feature for multi-agent collaboration (token-intensive feature, requires setting `CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1`)

## On the content level

The first thing that happens, after hinting that a team should be used, is the creation of the team via the **TeamCreate** tool:

<img width="1135" height="347" alt="Image" src="https://github.com/user-attachments/assets/286dfa97-391f-45cd-b1c5-f94bdeed4ff9" />

<details>
<summary>TeamCreate .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "0b418677-67b1-43c3-8158-c899f9f4f4de",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_014jQHLazWLXU2mP38mW2eW9",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_011b6enRc1S3eiNzuBKnzSNY",
        "name": "TeamCreate",
        "input": {
          "team_name": "test-coverage",
          "description": "Parallel test coverage improvement for clmail",
          "agent_type": "team-lead"
        }
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 1,
      "..."
    }
  },
  "requestId": "req_011CXrdwevH9Gq4Mm1ycbxVB",
  "type": "assistant",
  "uuid": "53231448-ad3f-4601-8a81-8fbbf275a2e3",
  "timestamp": "2026-02-06T10:13:38.336Z"
}
```

```json
{
  "parentUuid": "53231448-ad3f-4601-8a81-8fbbf275a2e3",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_011b6enRc1S3eiNzuBKnzSNY",
        "type": "tool_result",
        "content": [
          {
            "type": "text",
            "text": "{\n  \"team_name\": \"test-coverage\",\n  \"team_file_path\": \"/home/cboos/.claude/teams/test-coverage/config.json\",\n  \"lead_agent_id\": \"team-lead@test-coverage\"\n}"
          }
        ]
      }
    ]
  },
  "uuid": "d2603c25-c6cf-4299-bf4d-8c60071c786e",
  "timestamp": "2026-02-06T10:13:38.342Z",
  "toolUseResult": {
    "team_name": "test-coverage",
    "team_file_path": "/home/cboos/.claude/teams/test-coverage/config.json",
    "lead_agent_id": "team-lead@test-coverage"
  },
  "sourceToolAssistantUUID": "53231448-ad3f-4601-8a81-8fbbf275a2e3"
}
```

</details>


Then, we see a few **TaskCreate** tools:

<img width="1119" height="247" alt="Image" src="https://github.com/user-attachments/assets/d19afb66-e25f-4c30-909d-42f18fa53adc" />

<details>
<summary>TeamCreate .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "d2603c25-c6cf-4299-bf4d-8c60071c786e",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_01Ec5cNXX2bfF8AR1L4vKz7x",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_01Xa8W6RuwYjYGTsXPd7MNnk",
        "name": "TaskCreate",
        "input": {
          "subject": "Add tests for relay.py (HTTP delivery, retry, queue processing)",
          "description": "Add comprehensive tests for ...",
          "activeForm": "Writing relay.py tests"
        }
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 1,
      "..."
    }
  },
  "requestId": "req_011CXrdyAgxftyG68obF2wgb",
  "type": "assistant",
  "uuid": "03d2654d-de71-4da2-a5a0-08db04052893",
  "timestamp": "2026-02-06T10:13:50.778Z"
}
```

```json
{
  "parentUuid": "03d2654d-de71-4da2-a5a0-08db04052893",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_01Xa8W6RuwYjYGTsXPd7MNnk",
        "type": "tool_result",
        "content": "Task #1 created successfully: Add tests for relay.py (HTTP delivery, retry, queue processing)"
      }
    ]
  },
  "uuid": "6b170fd2-6b67-484b-9e12-a8e0c454a1ea",
  "timestamp": "2026-02-06T10:13:50.782Z",
  "toolUseResult": {
    "task": {
      "id": "1",
      "subject": "Add tests for relay.py (HTTP delivery, retry, queue processing)"
    }
  },
  "sourceToolAssistantUUID": "03d2654d-de71-4da2-a5a0-08db04052893"
}
```

</details>

This is followed by **Task** tools to "spawn" the teammates:

<img width="1138" height="646" alt="Image" src="https://github.com/user-attachments/assets/216005c4-f1c8-4a77-a3da-81447af44919" />

<details>
<summary>Task .json (tool use and result)</summary>

```jsonl
{
  "parentUuid": "b27a3cdb-df16-4d5d-88f3-fb23d8d04f2a",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_013pUkeSbwm9hTyqapjFreth",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_01GQxFKquDovnf18DYJsFisU",
        "name": "Task",
        "input": {
          "description": "Write relay.py tests",
          "prompt": "You are working ...",
          "subagent_type": "general-purpose",
          "team_name": "test-coverage",
          "name": "relay-tester",
          "mode": "bypassPermissions",
          "run_in_background": true
        }
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 1,
      "..."
    }
  },
  "requestId": "req_011CXre1pDjrd6rmwP6a7YKV",
  "type": "assistant",
  "uuid": "f08e2600-e533-42a7-905d-709741a986e6",
  "timestamp": "2026-02-06T10:14:33.232Z"
}
```

```json
{
  "parentUuid": "f08e2600-e533-42a7-905d-709741a986e6",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_01GQxFKquDovnf18DYJsFisU",
        "type": "tool_result",
        "content": [
          {
            "type": "text",
            "text": "Spawned successfully.\nagent_id: relay-tester@test-coverage\nname: relay-tester\nteam_name: test-coverage\nThe agent is now running and will receive instructions via mailbox."
          }
        ]
      }
    ]
  },
  "uuid": "0ae8a043-c326-4ed8-8005-35029e6b9f72",
  "timestamp": "2026-02-06T10:14:33.236Z",
  "toolUseResult": {
    "status": "teammate_spawned",
    "prompt": "You are working on ...",
    "teammate_id": "relay-tester@test-coverage",
    "agent_id": "relay-tester@test-coverage",
    "agent_type": "general-purpose",
    "model": "claude-opus-4-6",
    "name": "relay-tester",
    "color": "blue",
    "tmux_session_name": "in-process",
    "tmux_window_name": "in-process",
    "tmux_pane_id": "in-process",
    "team_name": "test-coverage",
    "is_splitpane": false,
    "plan_mode_required": false
  },
  "sourceToolAssistantUUID": "f08e2600-e533-42a7-905d-709741a986e6"
}
```

</details>

At this point, a connection will be made between the created tasks and the spawned teammates, with the first **TaskUpdate** tool calls (or maybe this just acks that the connection happened). At that point, each task is "owned" by a teammate.

<img width="1138" height="363" alt="Image" src="https://github.com/user-attachments/assets/22470eab-d1bd-4d1c-b4d3-43d46169a493" />

<details>
<summary>TaskUpdate .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "f1d99da5-55c2-4c19-8436-325df4116322",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_01UQYSuYUSkYsbSB6eMLg3Q9",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_01G3gjNUSfmyWWPNvmTtreCN",
        "name": "TaskUpdate",
        "input": {
          "taskId": "1",
          "owner": "relay-tester",
          "status": "in_progress"
        }
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 1,
      "..."
    }
  },
  "requestId": "req_011CXre5cbbvNPihFvab9oMK",
  "type": "assistant",
  "uuid": "4b19054c-40c7-432a-8a16-645ec4591558",
  "timestamp": "2026-02-06T10:15:08.029Z"
}
```

```json
{
  "parentUuid": "4b19054c-40c7-432a-8a16-645ec4591558",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_01G3gjNUSfmyWWPNvmTtreCN",
        "type": "tool_result",
        "content": "Updated task #1 owner, status"
      }
    ]
  },
  "uuid": "ca2a2828-fdb2-4e73-932a-f49659b3d373",
  "timestamp": "2026-02-06T10:15:08.034Z",
  "toolUseResult": {
    "success": true,
    "taskId": "1",
    "updatedFields": [
      "owner",
      "status"
    ],
    "statusChange": {
      "from": "pending",
      "to": "in_progress"
    }
  },
  "sourceToolAssistantUUID": "4b19054c-40c7-432a-8a16-645ec4591558"
}
```

</details>

While the team is working the lead can check the progress with **TaskList**:

<img width="1119" height="363" alt="Image" src="https://github.com/user-attachments/assets/5871881a-ce9f-46ac-836c-0361d6838cc3" />

<details>
<summary>TaskList .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "5eab48aa-755d-4579-8892-a62ec07a2b6e",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_01UPqgbJCEHE2VfVt8jyA7Ac",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_017M6WRNX5VYAc8dNJG43NJk",
        "name": "TaskList",
        "input": {}
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 3,
      "..."
    }
  },
  "requestId": "req_011CXroeZypDWfPZGYMNUefU",
  "type": "assistant",
  "uuid": "6c8c5f3c-46f4-4966-9d7c-20471b2d9986",
  "timestamp": "2026-02-06T12:20:36.312Z"
}
```

```json
{
  "parentUuid": "6c8c5f3c-46f4-4966-9d7c-20471b2d9986",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_017M6WRNX5VYAc8dNJG43NJk",
        "type": "tool_result",
        "content": "#1 [completed] Add tests for relay.py (HTTP delivery, retry, queue processing) (relay-tester)\n#3 [in_progress] Add tests for cli.py and services.py coverage gaps (cli-services-tester)\n#2 [in_progress] Add tests for server.py infrastructure (poller, WebSocket, PID, endpoints) (server-tester)"
      }
    ]
  },
  "uuid": "3811b2fe-0fea-4594-8c8f-e930b4ace17b",
  "timestamp": "2026-02-06T12:20:36.316Z",
  "toolUseResult": {
    "tasks": [
      {
        "id": "1",
        "subject": "Add tests for relay.py (HTTP delivery, retry, queue processing)",
        "status": "completed",
        "owner": "relay-tester",
        "blockedBy": []
      },
      {
        "id": "3",
        "subject": "Add tests for cli.py and services.py coverage gaps",
        "status": "in_progress",
        "owner": "cli-services-tester",
        "blockedBy": []
      },
      {
        "id": "2",
        "subject": "Add tests for server.py infrastructure (poller, WebSocket, PID, endpoints)",
        "status": "in_progress",
        "owner": "server-tester",
        "blockedBy": []
      }
    ]
  },
  "sourceToolAssistantUUID": "6c8c5f3c-46f4-4966-9d7c-20471b2d9986"
}
```

</details>

All the while, teammates can communicate. Message from teammates to the lead seem to arrive in batches, as XML within a user message:

<img width="1138" height="363" alt="Image" src="https://github.com/user-attachments/assets/40f8eea3-9b1d-4e69-baca-2f937fe9e4c8" />

Similarities with #90 noted.. Though the XML content is quite different.

<details>
<summary>User (teammate-message)</summary>

```json
{
  "parentUuid": "1d88957f-06d9-48cc-9713-6d29900a3b3c",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/Workspace/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": "<teammate-message ..."
  },
  "uuid": "e88aa4b0-47b0-4c2b-8ccb-7c7ee4dc31e1",
  "timestamp": "2026-02-06T12:20:24.561Z"
}
```

Zoom on the XML content:

```xml
<teammate-message teammate_id="relay-tester" color="blue" summary="relay.py tests done: 32 new tests, 15% -> 96% coverage">
Completed comprehensive tests for `src/clmail/relay.py` in `tests/test_remote.py`.

**Results: 55 tests pass, relay.py coverage: 15% -> 96%**

Added 6 test classes with 32 new tests:

1. **TestGetAuthHeaders** (2 tests): Token configured vs not configured.
2. **TestCalculateNextRetry** (4 tests): Attempts 0, 1, 2, and beyond max backoff index (caps at 1440 min).
3. **TestDeliverToRemote** (10 tests): Successful delivery, duplicate detection, HTTP 401, HTTP 500, unknown 200 status, ConnectError, TimeoutException, attachment base64 encoding, missing attachment skipped, auth headers inclusion.
4. **TestSendToRemote** (5 tests): Successful immediate delivery, failed delivery queuing, invalid address, message not found, custom port in target_host.
5. **TestProcessQueue** (7 tests): Successful retry, failed retry rescheduling, max attempts exceeded, deleted message handling, auto-fetch pending entries, multiple mixed results, invalid target address.
6. **TestIsRemoteRecipient** (4 tests): Remote, local, role, and role-prefixed addresses.

Only 4 lines uncovered (96%): the `OSError` handler during attachment reads and the generic `Exception` catch-all in `deliver_to_remote` -- both edge cases that would require filesystem or low-level mocking.
</teammate-message>

<teammate-message teammate_id="relay-tester" color="blue">
{"type":"idle_notification","from":"relay-tester","timestamp":"2026-02-06T10:36:50.559Z","idleReason":"available"}
</teammate-message>

<teammate-message teammate_id="relay-tester" color="blue" summary="Task #1 already completed, nothing more to do">
Task #1 was already completed before this assignment arrived. All 32 new relay.py tests are in tests/test_remote.py, 55 total tests pass, coverage is 96%. No further action needed.
</teammate-message>

<teammate-message teammate_id="relay-tester" color="blue">
{"type":"idle_notification","from":"relay-tester","timestamp":"2026-02-06T10:37:09.802Z","idleReason":"available"}
</teammate-message>

<teammate-message teammate_id="relay-tester" color="blue">
{"type":"idle_notification","from":"relay-tester","timestamp":"2026-02-06T10:37:16.741Z","idleReason":"available"}
</teammate-message>
```

Though these are all coming from "relay-tester", in another example we can see messages from different teammates intermingled.

</details>

Communication the other way round is performed by the **SendMessage** tool:

<img width="1177" height="682" alt="Image" src="https://github.com/user-attachments/assets/230eb646-1b35-47a8-8e88-f21b5f97d719" />

<details>
<summary>SendMessage .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "a2a11b2a-5854-409a-97aa-9575aa9a5752",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_019bXKeWKvRukCnBrghhC5ri",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_013e3pGxRhe7KobuyG5Tee5x",
        "name": "SendMessage",
        "input": {
          "type": "shutdown_request",
          "recipient": "relay-tester",
          "content": "Great work! Shutting down - task #1 is complete."
        }
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 3,
      "..."
    }
  },
  "requestId": "req_011CXrodrg8JV3WggAdBF6pP",
  "type": "assistant",
  "uuid": "3863f51b-24fa-4a88-923d-e1f47e435ad2",
  "timestamp": "2026-02-06T12:20:29.385Z"
}
```

```json
{
  "parentUuid": "3863f51b-24fa-4a88-923d-e1f47e435ad2",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_013e3pGxRhe7KobuyG5Tee5x",
        "type": "tool_result",
        "content": [
          {
            "type": "text",
            "text": "{\n  \"success\": true,\n  \"message\": \"Shutdown request sent to relay-tester. Request ID: shutdown-1770380429389@relay-tester\",\n  \"request_id\": \"shutdown-1770380429389@relay-tester\",\n  \"target\": \"relay-tester\"\n}"
          }
        ]
      }
    ]
  },
  "uuid": "e994eb7b-4974-4ba7-af0b-538f0c267716",
  "timestamp": "2026-02-06T12:20:29.390Z",
  "toolUseResult": {
    "success": true,
    "message": "Shutdown request sent to relay-tester. Request ID: shutdown-1770380429389@relay-tester",
    "request_id": "shutdown-1770380429389@relay-tester",
    "target": "relay-tester"
  },
  "sourceToolAssistantUUID": "3863f51b-24fa-4a88-923d-e1f47e435ad2"
}
```

</details>

Then, the teammate winds down... communicates about it (same way).

<img width="1254" height="782" alt="Image" src="https://github.com/user-attachments/assets/a536da47-3808-4dca-8bd9-12490adc23ad" />

```xml
<teammate-message teammate_id="relay-tester" color="blue">
{"type":"shutdown_approved","requestId":"shutdown-1770380429389@relay-tester","from":"relay-tester","timestamp":"2026-02-06T12:20:33.237Z","paneId":"in-process","backendType":"in-process"}
</teammate-message>
```

and:

```xml
<teammate-message teammate_id="system">
{"type":"teammate_terminated","message":"relay-tester has shut down."}
</teammate-message>
```

Then it's the whole team that winds down via **TeamDelete** (synchronization is not yet perfect, as noted in the [limitations](https://code.claude.com/docs/en/agent-teams#limitations) "slow shutdown").

<img width="1212" height="617" alt="Image" src="https://github.com/user-attachments/assets/78672d54-376f-4267-97c2-e282406313a9" />

<details>
<summary>TeamDelete .json (tool use and tool result)</summary>

```json
{
  "parentUuid": "57fd2820-f784-4be8-a72b-74be6b0db7d2",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "message": {
    "model": "claude-opus-4-6",
    "id": "msg_01D6cuc2vmhGqzu34aLChC4N",
    "type": "message",
    "role": "assistant",
    "content": [
      {
        "type": "tool_use",
        "id": "toolu_01MdH81H26Sta1NNUQJZ5B1a",
        "name": "TeamDelete",
        "input": {}
      }
    ],
    "stop_reason": null,
    "stop_sequence": null,
    "usage": {
      "input_tokens": 1,
      "..."
    }
  },
  "requestId": "req_011CXrojYMivbZMnUK1fWiEG",
  "type": "assistant",
  "uuid": "01f0b17b-cdf6-44fa-93d9-aac16b1ae4e3",
  "timestamp": "2026-02-06T12:21:43.845Z"
}
```

```json
{
  "parentUuid": "01f0b17b-cdf6-44fa-93d9-aac16b1ae4e3",
  "isSidechain": false,
  "teamName": "test-coverage",
  "userType": "external",
  "cwd": "/home/cboos/...",
  "sessionId": "d602eb5f-0f14-4a11-b0dd-b6f3af48833c",
  "version": "2.1.34",
  "gitBranch": "review/master",
  "slug": "deep-launching-nest",
  "type": "user",
  "message": {
    "role": "user",
    "content": [
      {
        "tool_use_id": "toolu_01MdH81H26Sta1NNUQJZ5B1a",
        "type": "tool_result",
        "content": [
          {
            "type": "text",
            "text": "{\n  \"success\": false,\n  \"message\": \"Cannot cleanup team with 2 active member(s): server-tester, cli-services-tester. Use requestShutdown to gracefully terminate teammates first.\",\n  \"team_name\": \"test-coverage\"\n}"
          }
        ]
      }
    ]
  },
  "uuid": "0f3ebdf9-3a66-40aa-87bd-9b507631220a",
  "timestamp": "2026-02-06T12:21:43.848Z",
  "toolUseResult": {
    "success": false,
    "message": "Cannot cleanup team with 2 active member(s): server-tester, cli-services-tester. Use requestShutdown to gracefully terminate teammates first.",
    "team_name": "test-coverage"
  },
  "sourceToolAssistantUUID": "01f0b17b-cdf6-44fa-93d9-aac16b1ae4e3"
}
```

</details>

Even after that TeamDelete, more messages will come...

```xml
<teammate-message teammate_id="cli-services-tester" color="yellow" summary="3 more tests added, 205 total pass">
Added 3 more tests from the updated task description. All 205 tests pass now (35 new total).

Additional tests added:
...
```

(but this changes nothing I believe for our rendering)

So, in summary, we have to support:
- TeamCreate
- TaskCreate
- Task (for teammate creation, slightly different than regular sub-agent or even async task, but should also be used as a "container" for the activity of the teammate); **However...**
- TaskUpdate
- User as container for `<teammate-message>` elements
- SendMessage
- TeamDelete

**However...**, what is totally absent in our current rendering is the **whole transaction** perform by a teammate! That's of course something we have to fix, as making visible that "under the hood" activity would definitely be a great feature of claude-code-log.

Looks like we have to gobble the `~/.claude/projects/<project-path>/<session-id>/subagents/agent-*.jsonl` transcripts for that... These indeed contain the "typical" tools (Bash, Read, Grep, Edit, etc.), plus, noted, the SendMessage (here, the recipient is "team-lead"!) and TaskUpdate ones. But wait, we should *already* have this, thanks to #80... Looks like that  one only works for traditional "sync" tasks for now, as we don't really use the agentId to make the connection, so if it looks OK, it's simply due to the timestamp ordering of the messages. Some rework along the lines of #85 is really in order, I think (reopening #79). 

Back to teammates: as everything is happening in parallel, we can't count on (and shouldn't use) the timestamps. And while the different subagents/agent-*.jsonl can be chained via uuid/parentUuid, I don't see the connection between any Task message from the main session .jsonl and any messages in the side chains. The first message of the initial agent-*.jsonl file has `"parentUuid": null`. This was already the case in the example of #80, but there at least the main session .jsonl contained a reference to the `agentId`. Async agents (#90) share a similar concern: they don't contain an explicit `"agentId": "..."` but at least they have that within their XML (`<task-notification><task-id>a8b740b</task-id>`). And for teammates... nothing! Free for all, when it comes about designing the message data model, it seems ;-)

We could have an heuristic using the taskId to make the correspondence, not ideal though. Alternatively, the first message of the first teammate agent session is a User message with a `<teammate-message>` content, and it contains the Task prompt *verbatim*... As long as this property holds (or until they add a more explicit link between the two sides), we could use a hash of that prompt to make the correspondence:

i.e., the Task tool result:

```
"message":{"type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01N3pEqHvxg2fM7LE7ovvcrJ","name":"Task","input":{"description":"Write server.py tests","prompt":"You are working ...", "subagent_type":"general-purpose","team_name":"test-coverage","name":"server-tester","mode":"bypassPermissions","run_in_background":true}}]
```

can be linked to agent-*.jsonl's first message via the exact same `"You are working ..."` content:

```
"message":{"role":"user","content":"<teammate-message teammate_id=\"team-lead\" summary=\"Write server.py tests\">\nYou are working ...\n</teammate-message>"
```

## On the presentation level

One thing we ought to do: associate the color with the agent name (hoping that stays in case of agent name reuse during a long session?) and also use that in the TaskUpdate. We could render it as a claude code icon with that bg color, somewhere in the header or at the left of the message.

Note: speaking about left/right... My conversation-like alignment (WhatsApp or Teams style, with the sender message aligned to the right side, and the received message aligned on the left side), this made somehow sense when the user messages were clearly from the user, but here, these "pseudo-user" messages should really be aligned to the left, I think, even if they are level 1 ones, with assistants messages below.

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