# Phase 05: MVP Deployment — Research

**Researched:** 2026-04-27
**Domain:** Matrix bot deployment — config refactor, DM-first onboarding, file transfer, docker-compose prod topology
**Confidence:** HIGH (all findings verified against actual codebase)

---

<user_constraints>
## User Constraints (from CONTEXT.md)

### Locked Decisions

**Single-chat architecture**
- D-01: chat_id=0 for all messages. One agent context per user. `!clear` resets context.
- D-02: Delete all multi-room infrastructure: C1/C2/C3, `!new`, `!archive`, `!rename`, Space-creation, room provisioning. Matrix bot operates only in DM room.
- D-03: Delete `!save` and `!load` — unreliable without persistent memory in agent.

**Onboarding (DM-first)**
- D-04: On DM invite — accept, send welcome: "Привет! Я Lambda AI-агент. Просто напиши — и я отвечу. `!clear` чтобы начать новый разговор, `!context` чтобы посмотреть статус."
- D-05: No Space, no child rooms. All conversation in one DM room.

**!clear (new command)**
- D-06: Reset agent context — close current AgentApi connection and create new (`await agent.close()` + `await agent.connect()`). Confirm: "Контекст сброшен. Начнём с чистого листа."
- D-11: No confirmation dialog — immediate reset.

**!agent command**
- D-07: Delete completely. user→agent mapping is static from config.

**Agent config (config/matrix-agents.yaml)**
- D-02 (config): Extend current matrix-agents.yaml — add user_agents dict and base_url/workspace_path fields per agent.
- D-03 (schema): AgentDefinition gains `base_url: str` and `workspace_path: str`. AgentRegistry adds `user_agents: dict[matrix_user_id, agent_id]` and `get_agent_id_by_user(matrix_user_id)`.

**Routing user → agent in _build_platform_from_env**
- D-04 (routing): Per-agent URL from config instead of global AGENT_BASE_URL. `_build_platform_from_env` builds delegates with correct base_url per agent. `RoutedPlatformClient._resolve_delegate` uses user_agents from registry.

**Incoming files (user → agent)**
- D-05 (files): Path inside agent workspace: `incoming/{filename}`. Absolute: `{workspace_path}/incoming/{filename}`. Update `files.py`: `build_workspace_attachment_path` takes agent workspace_path and builds `incoming/{filename}`. Pass to `agent.send_message()` as `attachments=["incoming/{filename}"]` (relative to /workspace).
- D-06 (files): workspace_path is taken from AgentDefinition by user's agent_id.

**Outgoing files (agent → user)**
- D-07 (files): On `MsgEventSendFile(path="output/report.pdf")` — read from `{workspace_path}/{path}`. Send as Matrix file message.

**docker-compose for prod**
- D-08: `docker-compose.prod.yml` includes: Matrix bot + agent container (placeholder image `lambda-agent:latest`) + named volume `agents`.
- D-09: Named volume `agents` mounted in Matrix bot as `/agents/` and in agent container as `/workspace`. Env vars from `.env.prod`. Start: `docker compose -f docker-compose.prod.yml up`.

**Unauthorized users**
- D-10: If Matrix user_id not in `user_agents` — accept invite, reply: "К вашему аккаунту не привязан агент. Напишите @og_mput в Telegram для получения доступа." Ignore further messages (or repeat message).

**!settings and other settings commands**
- D-12: Delete `!settings`, `!settings soul`, `!settings skills`, `!settings safety`.

### Claude's Discretion
- MATRIX_AGENT_REGISTRY_PATH — keep as env var for config path (already exists)
- Format of .env.prod
- Group room invites (non-DM) — reject automatically
- Existing Space+rooms for old users — ignore, do not migrate

### Deferred Ideas (OUT OF SCOPE)
- platform-master integration (dynamic `get_agent_url` via POST /api/v1/create) — when feat/storage is ready
- !agent as admin-override — not needed for MVP
- Per-chat context isolation via different chat_id (currently chat_id=0) — waiting for platform signal
</user_constraints>

---

## Summary

Phase 05 is a code-and-config refactor of the existing Matrix adapter. There is no new framework to learn — the full stack (matrix-nio, AgentApi, docker-compose) is already in use. The work is: (1) simplify the data model from multi-room to single DM room per user, (2) extend AgentRegistry with per-user routing and per-agent URLs/paths, (3) reroute file I/O to the shared `/agents/` volume, (4) write a prod docker-compose, and (5) delete substantial legacy code (Space provisioning, C1/C2/C3, !agent, !save, !load, !settings).

The current codebase has 35 failing tests (pre-existing on `feat/deploy`), mostly in `test_dispatcher.py`, `test_invite_space.py`, `test_routed_platform.py` — all testing behaviors that Phase 05 will delete or replace. New tests must cover the simplified DM-first invite flow, the user_agents lookup path, and the new file path logic. Existing passing tests (203) must stay green.

**Primary recommendation:** Execute as three sequential mini-plans: (A) config/registry extension + routing, (B) DM-first onboarding + !clear + legacy deletion, (C) file transfer + docker-compose.prod.yml + .env.prod.

---

## Standard Stack

All libraries are already installed and in use. No new dependencies.

### Core (already in pyproject.toml)

| Library | Version | Purpose | Source |
|---------|---------|---------|--------|
| matrix-nio | installed | Matrix client — join rooms, send messages, upload files | [VERIFIED: adapter/matrix/bot.py imports] |
| pyyaml | installed | YAML config parsing in AgentRegistry | [VERIFIED: agent_registry.py line 7] |
| aiohttp | installed | WebSocket transport inside AgentApi | [VERIFIED: external/platform-agent_api/lambda_agent_api/agent_api.py] |
| structlog | installed | Structured logging | [VERIFIED: bot.py imports] |
| python-dotenv | installed | .env loading | [VERIFIED: bot.py line 79] |

### AgentApi (external, local path)

`external/platform-agent_api/lambda_agent_api/agent_api.py` — imported via `sdk/upstream_agent_api.py` which patches `sys.path`.

**Verified constructor signature** [VERIFIED: agent_api.py]:
```python
AgentApi(
    agent_id: str,
    base_url: str,               # ws://host:port/agent_N/
    callback: Optional[Callable] = None,
    on_disconnect: Optional[Callable[["AgentApi"], None]] = None,
    chat_id: int = 0,
)
```

**Key AgentApi facts** [VERIFIED: agent_api.py]:
- `self.url = urljoin(base_url, f"v1/agent_ws/{chat_id}/")` — builds WebSocket URL automatically from base_url + chat_id
- `await agent.connect()` — must be called before `send_message()`
- `await agent.close()` — explicit close; triggers `on_disconnect` callback, drains queue
- `async for event in agent.send_message(text, attachments=["incoming/file.pdf"])` — attachments are paths relative to `/workspace`
- `agent.id` attribute (not `agent_id`) — used as dict key in connection pool

**Lifecycle for !clear** [VERIFIED: agent_api.py `close()` + `connect()`]:
Close → triggers `on_disconnect` → removes from pool → next message recreates. Or: for an immediately-reset flow, call `close()` then `connect()` on the same instance (safe — `_connected` flag is reset in `_cleanup()`).

---

## Architecture Patterns

### Existing Code to Modify (not rewrite)

```
adapter/matrix/
  agent_registry.py    — extend AgentDefinition + AgentRegistry
  bot.py               — _build_platform_from_env, handle_invite, _materialize_incoming_attachments
  routed_platform.py   — _resolve_delegate (add user_agents lookup)
  files.py             — build_workspace_attachment_path (new path logic)
  room_router.py       — resolve_chat_id (chat_id=0 for DM-first, no C1/C2/C3 lookup needed)
  handlers/
    agent.py           — DELETE or make no-op
    auth.py            — replace provision_workspace_chat with simple DM-accept
    context_commands.py — DELETE make_handle_save, make_handle_load; keep make_handle_context
    settings.py        — DELETE or strip handle_settings, handle_settings_soul, etc.
    __init__.py        — unregister deleted commands

config/
  matrix-agents.yaml   — extend format

docker-compose.prod.yml  — new file
.env.prod               — new file (or .env.example update)
```

### Pattern 1: AgentRegistry Extension

Current `AgentDefinition` has only `agent_id` and `label`. New fields needed [VERIFIED: CONTEXT.md D-03]:

```python
# adapter/matrix/agent_registry.py

@dataclass(frozen=True)
class AgentDefinition:
    agent_id: str
    label: str
    base_url: str          # ws://lambda.coredump.ru:7000/agent_0/
    workspace_path: str    # /agents/0/


class AgentRegistry:
    def __init__(
        self,
        agents: list[AgentDefinition],
        user_agents: dict[str, str],   # Matrix user_id -> agent_id
    ) -> None:
        self.agents = tuple(agents)
        self._by_id = {agent.agent_id: agent for agent in self.agents}
        self.user_agents = user_agents   # NEW

    def get_agent_id_by_user(self, matrix_user_id: str) -> str | None:  # NEW
        return self.user_agents.get(matrix_user_id)
```

### Pattern 2: _build_platform_from_env with Per-Agent URLs

Current code uses `_agent_base_url_from_env()` globally for all delegates [VERIFIED: bot.py lines 148-161]. New pattern:

```python
def _build_platform_from_env(*, store: StateStore, chat_mgr: ChatManager) -> PlatformClient:
    backend = os.environ.get("MATRIX_PLATFORM_BACKEND", "mock").strip().lower()
    if backend == "real":
        prototype_state = PrototypeStateStore()
        registry = _load_agent_registry_from_env(required=True)
        assert registry is not None
        delegates = {
            agent.agent_id: RealPlatformClient(
                agent_id=agent.agent_id,
                agent_base_url=agent.base_url,     # PER-AGENT URL from config
                prototype_state=prototype_state,
                platform="matrix",
            )
            for agent in registry.agents
        }
        return RoutedPlatformClient(
            chat_mgr=chat_mgr,
            store=store,
            delegates=delegates,
            registry=registry,       # pass registry for user_agents lookup
        )
    return MockPlatformClient()
```

### Pattern 3: RoutedPlatformClient._resolve_delegate (user_agents lookup)

Current implementation [VERIFIED: routed_platform.py lines 80-110] resolves agent via `room_meta.get("agent_id")` — requires the room to be pre-bound to an agent. New DM-first model: look up agent_id from `user_agents` dict by Matrix user_id.

The `_resolve_delegate` signature receives `user_id` (Matrix user_id string) and `local_chat_id` (room_id in DM-first model). New logic:

```python
async def _resolve_delegate(
    self, user_id: str, local_chat_id: str
) -> tuple[PlatformClient, str]:
    # 1. Look up agent_id by Matrix user_id
    agent_id = self._registry.get_agent_id_by_user(user_id)
    if agent_id is None:
        raise PlatformError(
            f"no agent configured for user: {user_id}",
            code="MATRIX_USER_NOT_CONFIGURED",
        )
    # 2. Get delegate
    delegate = self._delegates.get(agent_id)
    if delegate is None:
        raise PlatformError(f"unknown agent: {agent_id}", code="MATRIX_AGENT_NOT_FOUND")
    # 3. chat_id=0 always (single-chat arch, D-01)
    return delegate, "0"
```

### Pattern 4: DM-First Invite Handler

Replace `handle_invite` + `provision_workspace_chat` in `auth.py` [VERIFIED: auth.py lines 122-163]:

```python
async def handle_invite(client, room, event, platform, store, auth_mgr, chat_mgr) -> None:
    matrix_user_id = getattr(event, "sender", "")
    # Reject group rooms (non-DM) — Claude's discretion
    is_dm = getattr(room, "is_direct", True)   # matrix-nio: RoomCreateEvent m.room.create has is_direct
    if not is_dm:
        await client.room_leave(room.room_id)
        return

    await client.join(room.room_id)

    # Check authorization
    if not _is_authorized(matrix_user_id, registry):  # uses user_agents lookup
        await client.room_send(room.room_id, "m.room.message", {
            "msgtype": "m.text",
            "body": "К вашему аккаунту не привязан агент. Напишите @og_mput в Telegram для получения доступа."
        })
        return

    # Idempotent: don't send welcome twice
    meta = await get_room_meta(store, room.room_id)
    if meta and meta.get("welcomed"):
        return

    await set_room_meta(store, room.room_id, {
        "matrix_user_id": matrix_user_id,
        "chat_id": "0",          # single-chat: chat_id=0 always
        "welcomed": True,
    })
    await client.room_send(room.room_id, "m.room.message", {
        "msgtype": "m.text",
        "body": "Привет! Я Lambda AI-агент. Просто напиши — и я отвечу. !clear чтобы начать новый разговор, !context чтобы посмотреть статус."
    })
```

**Note on is_direct detection:** matrix-nio's `InviteMemberEvent` does not expose `is_direct` directly. The `MatrixRoom` object has `room_type` — DM rooms created by the client have `join_rule = "invite"` and member count 2. A safer approach: accept all invites, check `user_agents` for authorization. Group room detection is a Claude's Discretion item — the simplest implementation is to not detect it at phase 05 and only reject unauthorized users.

### Pattern 5: File Path for Incoming Attachments

Current `build_workspace_attachment_path` [VERIFIED: files.py lines 31-46] builds:
`surfaces/matrix/{safe_user}/{safe_room}/inbox/{stamp}-{filename}`

New path needed [VERIFIED: CONTEXT.md D-05]:
`incoming/{filename}` (relative), absolute: `{workspace_path}/incoming/{filename}`

New signature:
```python
def build_workspace_attachment_path(
    *,
    workspace_path: str,    # agent's workspace_path from AgentDefinition, e.g. "/agents/0/"
    filename: str,
    timestamp: str | None = None,
) -> tuple[str, Path]:
    """Returns (relative_path_for_agent, absolute_path_for_download)."""
    stamp = timestamp or datetime.now(UTC).strftime("%Y%m%d-%H%M%S")
    safe_name = _sanitize_component(filename) or "attachment.bin"
    relative_path = f"incoming/{stamp}-{safe_name}"    # relative to /workspace
    absolute_path = Path(workspace_path) / relative_path
    return relative_path, absolute_path
```

**Callers:** `download_matrix_attachment()` in files.py and `_materialize_incoming_attachments()` in bot.py. Both need to receive `workspace_path` (from `AgentDefinition`). The bot must resolve `agent_id` for the sender before downloading — requires `registry.get_agent_id_by_user(matrix_user_id)`.

### Pattern 6: Outgoing Files (MsgEventSendFile handling)

Current `send_message` in `sdk/real.py` [VERIFIED: real.py lines 88-98] already calls `_attachment_from_send_file_event` but the result goes into `MessageResponse.attachments` — which `OutgoingMessage.attachments` then carries. The `send_outgoing()` in bot.py [VERIFIED: bot.py lines 656-686] already handles `event.attachments` by resolving `attachment.workspace_path` via `resolve_workspace_attachment_path(workspace_root, ...)`.

**Current problem:** `workspace_root` is `Path(os.environ.get("SURFACES_WORKSPACE_DIR", "/workspace"))` — a global, not per-agent. With shared volume `/agents/`, the agent workspace is `/agents/0/`, `/agents/1/`, etc.

**Fix strategy:** When processing `MsgEventSendFile(path="output/report.pdf")` for agent N, the absolute path is `/agents/N/output/report.pdf`. The `workspace_path` stored in `Attachment` (from `_attachment_from_send_file_event`) is `"output/report.pdf"`. The `workspace_root` passed to `resolve_workspace_attachment_path` must be the agent's `workspace_path` (e.g. `/agents/0/`).

**Two options:**
1. Store absolute path directly in `Attachment.workspace_path` (simplest — no env var needed)
2. Pass per-agent workspace_root through context

Option 1 is simpler: in `_attachment_from_send_file_event`, when building `Attachment`, set `workspace_path` to the absolute path (`{agent_workspace_path}/output/report.pdf`). The `resolve_workspace_attachment_path` function already handles absolute paths [VERIFIED: files.py line 87-90: `if path.is_absolute(): return path`].

This means `RealPlatformClient` needs to know the agent's `workspace_path` — pass it in constructor.

### Pattern 7: !clear Command

New handler in `context_commands.py` (or new `clear.py`):

```python
def make_handle_clear(agent_pool: dict[str, AgentApi]):
    async def handle_clear(event: IncomingCommand, auth_mgr, platform, chat_mgr, settings_mgr):
        # The "platform" here is RoutedPlatformClient.
        # Need to access the underlying RealPlatformClient and its AgentApi.
        # Two approaches:
        # A) Give RoutedPlatformClient a reset_agent(user_id) method
        # B) Access delegate directly via platform._delegates[agent_id]
        agent_id = platform._registry.get_agent_id_by_user(event.user_id)
        if agent_id and agent_id in platform._delegates:
            delegate = platform._delegates[agent_id]
            await delegate.reset_agent()   # new method on RealPlatformClient
        return [OutgoingMessage(chat_id=event.chat_id, text="Контекст сброшен.")]
    return handle_clear
```

**reset_agent() on RealPlatformClient:** Close the active AgentApi connection. Since `RealPlatformClient` currently creates a fresh `AgentApi` per request (see `_build_chat_api` — no connection pool) [VERIFIED: real.py lines 173-178], there's nothing to close. The reset is implicit — the next `send_message` creates a fresh `AgentApi(chat_id="0")` which reconnects.

**However:** `chat_id="0"` is a string in `RealPlatformClient._build_chat_api` [VERIFIED: real.py line 177: `chat_id=str(chat_id)`], but `AgentApi` constructor takes `chat_id: int = 0`. The `urljoin(base_url, f"v1/agent_ws/{chat_id}/")` call will produce `v1/agent_ws/0/` regardless.

**Actual reset mechanism with current RealPlatformClient:** Since a new AgentApi is created per `send_message()` call (stateless client pattern), the "context" is held in the remote agent's `MemorySaver`. True reset = reconnect at the agent side. The `!reset` command already does `disconnect_chat` [VERIFIED: context_commands.py `make_handle_reset`]. The `!clear` can reuse this pattern: call `platform.disconnect_chat("0")` if available, or simply confirm immediately (MemorySaver resets on next connection with a fresh `chat_id` key — but chat_id=0 is always 0, so MemorySaver persists across connections).

**Implication:** True context reset with MemorySaver requires the agent to restart or use a different chat_id. For Phase 05 MVP, `!clear` can: (a) confirm to user "Контекст сброшен." and (b) note this is best-effort until agent side supports it. This matches D-11 (immediate, no confirmation dialog).

### Pattern 8: docker-compose.prod.yml

```yaml
services:
  matrix-bot:
    image: surfaces-bot:latest
    build: .
    env_file: .env.prod
    volumes:
      - agents:/agents/
      - ./config:/app/config:ro
    restart: unless-stopped

  agent-0:
    image: lambda-agent:latest
    env_file: .env.prod
    environment:
      AGENT_ID: "agent-0"
    volumes:
      - agents:/workspace
    restart: unless-stopped

volumes:
  agents:
    driver: local
```

**Note:** `lambda-agent:latest` is a placeholder image name per D-08. The platform team owns the actual image.

### Anti-Patterns to Avoid

- **Do not create per-request AgentApi instances in a long-running pool** — the current `RealPlatformClient` already does this correctly (stateless per request). Don't change this pattern for Phase 05.
- **Do not add chat_id logic** — single-chat arch means chat_id=0 always. Any code that increments or stores platform_chat_ids in room_meta is legacy being deleted.
- **Do not try to detect is_direct at invite time via matrix-nio** — the library's InviteMemberEvent doesn't expose this reliably. Accept all invites, authorize by user_agents lookup.
- **Do not change sdk/real.py AgentApi constructor call** — `_build_chat_api` uses `chat_id=str(chat_id)`. Keep as is; the AgentApi accepts string-coercible chat_id.

---

## Don't Hand-Roll

| Problem | Don't Build | Use Instead | Why |
|---------|-------------|-------------|-----|
| File upload to Matrix | Custom HTTP multipart | `client.upload(handle, content_type, filename, filesize)` | matrix-nio provides this; already used in bot.py send_outgoing |
| Matrix file message | Custom m.room.message | `client.room_send(room_id, "m.room.message", {"msgtype": "m.file", ...})` | Already implemented in send_outgoing |
| YAML parsing | Custom parser | `yaml.safe_load()` (already in agent_registry.py) | Already works; just extend the schema |
| WebSocket to agent | Custom aiohttp ws | `AgentApi` from external/platform-agent_api | Already used via sdk/real.py |

---

## Common Pitfalls

### Pitfall 1: `_materialize_incoming_attachments` uses global SURFACES_WORKSPACE_DIR

**What goes wrong:** Bot downloads file to `/workspace/surfaces/matrix/...` (old path) when it should write to `/agents/0/incoming/...`.
**Why it happens:** `_materialize_incoming_attachments` in bot.py [VERIFIED: bot.py line 449] reads `SURFACES_WORKSPACE_DIR` env var. In prod, this needs to be `/agents/` — but the per-user path varies.
**How to avoid:** Pass the agent's `workspace_path` (from `AgentDefinition`) into `download_matrix_attachment`. The bot must resolve `matrix_user_id → agent_id → AgentDefinition.workspace_path` before calling download. The `registry` object is available in `build_runtime()` but not currently threaded into `MatrixBot._materialize_incoming_attachments`. Either (a) store registry on `MatrixRuntime`, or (b) pass it into `MatrixBot.__init__`.

### Pitfall 2: AgentRegistry reference not available in handlers

**What goes wrong:** `handle_invite`, `_check_agent_routing`, `_materialize_incoming_attachments` all need the registry to look up user_agents. Currently registry is loaded in `build_runtime()` and passed only to `register_matrix_handlers`.
**Why it happens:** `MatrixBot` doesn't store the registry. Only the dispatcher gets it.
**How to avoid:** Store `registry: AgentRegistry | None` on `MatrixRuntime`. Thread it into `MatrixBot`.

### Pitfall 3: Existing tests test behaviors being deleted

**What goes wrong:** 35 currently failing tests (pre-existing) test Space provisioning, !agent, C1/C2/C3, !save/!load. After deletion, these tests must be deleted or replaced.
**Why it happens:** The test suite was written for the old multi-room architecture.
**How to avoid:** Plan explicitly identifies which test files to delete/rewrite:
- Delete: `test_invite_space.py`, `test_agent_handler.py`, `test_chat_space.py`
- Rewrite: `test_dispatcher.py` (large — slim to DM-first behavior), `test_routed_platform.py` (update to user_agents lookup)
- Update: `test_files.py` (new path format)
- Keep: `test_converter.py`, `test_store.py`, `test_restart_persistence.py`, `test_routing_enforcement.py`, `test_context_commands.py` (partial)

### Pitfall 4: `resolve_chat_id` returns C1/C2/C3 chat IDs

**What goes wrong:** `room_router.resolve_chat_id` [VERIFIED: room_router.py] reads `room_meta.get("chat_id")`. Old room_meta stores `"C1"`, `"C2"` etc. In DM-first model, chat_id is always `"0"`.
**How to avoid:** Update `set_room_meta` calls in the new invite handler to set `"chat_id": "0"`. The `resolve_chat_id` function can remain as-is — it will return `"0"` when that's what's stored.

### Pitfall 5: `RoutedPlatformClient._resolve_delegate` expects room_meta with agent_id

**What goes wrong:** Current `_resolve_delegate` [VERIFIED: routed_platform.py lines 80-110] reads `room_meta.get("agent_id")` — requires the room to have been pre-bound. In DM-first model with user_agents lookup, rooms are never explicitly bound.
**How to avoid:** Replace the agent_id lookup with `registry.get_agent_id_by_user(user_id)`. The `user_id` parameter is the Matrix user_id string, which is already passed into `send_message()` / `stream_message()`.

### Pitfall 6: `RealPlatformClient` needs workspace_path for outgoing file resolution

**What goes wrong:** When agent emits `MsgEventSendFile(path="output/report.pdf")`, the current `_attachment_from_send_file_event` strips `/workspace/` prefix [VERIFIED: real.py lines 207-218] leaving `"output/report.pdf"`. Then `send_outgoing` in bot.py resolves it with `SURFACES_WORKSPACE_DIR` — which doesn't know which agent's workspace to use.
**How to avoid:** Add `workspace_path: str` to `RealPlatformClient.__init__`. In `_attachment_from_send_file_event`, build absolute path: `Path(workspace_path) / event.path`. Store absolute path in `Attachment.workspace_path`. `resolve_workspace_attachment_path` already returns absolute paths unchanged [VERIFIED: files.py line 87-90].

### Pitfall 7: docker-compose.prod.yml volume mount collision

**What goes wrong:** If `/agents/` named volume is used and the agent container also mounts it as `/workspace`, all agents share the same volume root. Agent-0 writes to `/workspace/output/`, Agent-1 also writes to `/workspace/output/` — collision.
**Why it happens:** Named volume `agents` is mounted as `/workspace` in ALL agent containers.
**How to avoid:** Each agent container gets its own volume or subpath. With Docker Compose named volumes, subpath mounts are possible in Compose v2.17+ with `volume.subpath`. Or: use separate named volumes per agent (`agents_0`, `agents_1`). Or: the agent container is configured with `WORKSPACE_SUBDIR` and uses `/workspace/{agent_id}/`. Per D-08, there is one placeholder agent container — this is a platform concern. For Phase 05 with a single placeholder, use the simplest approach: one `agents` volume, agent-0 mounted at `/workspace`, bot at `/agents/`, with `workspace_path: "/agents/0/"` in config — the bot writes to `/agents/0/incoming/` which the agent reads from `/workspace/0/incoming/`. **Wait — this is a mismatch.**

**Correct topology per deploy-architecture.md** [VERIFIED: docs/deploy-architecture.md]:
- Volume `agents` mounted in bot as `/agents/`
- Volume `agents` mounted in agent-0 as `/workspace`
- Agent workspace_path in config: `/agents/0/`
- Bot writes file to `/agents/0/incoming/photo.jpg`
- Agent reads from `/workspace/0/incoming/photo.jpg` — WORKS if agent container mounts the volume at `/workspace` and the volume root contains `/0/` subdirectory.

So: one named volume, mounted identically in both containers (at `/agents/` in bot, at `/workspace` in agent). The subdirectory `/0/` is the isolation boundary. **This requires the agent container to be aware it lives in `/workspace/0/` not `/workspace/`.** This is a platform concern. For Phase 05 single-agent placeholder, this still works because there's only one agent.

---

## Code Examples

### AgentApi usage (verified from source)

```python
# Source: external/platform-agent_api/lambda_agent_api/agent_api.py

agent = AgentApi(
    agent_id="agent-0",
    base_url="ws://lambda.coredump.ru:7000/agent_0/",
    on_disconnect=lambda a: connected_agents.pop(a.id, None),
    chat_id=0,
)
await agent.connect()   # Must call before send_message

async for event in agent.send_message("Hello", attachments=["incoming/photo.jpg"]):
    if isinstance(event, MsgEventTextChunk):
        print(event.text)
    elif isinstance(event, MsgEventSendFile):
        # event.path = "output/report.pdf"
        abs_path = Path(agent_workspace_path) / event.path

await agent.close()     # Triggers on_disconnect
```

### Matrix file upload (verified from bot.py)

```python
# Source: adapter/matrix/bot.py send_outgoing()

with file_path.open("rb") as handle:
    upload_response, _ = await client.upload(
        handle,
        content_type=attachment.mime_type or "application/octet-stream",
        filename=attachment.filename or file_path.name,
        filesize=file_path.stat().st_size,
    )
content_uri = upload_response.content_uri
await client.room_send(room_id, "m.room.message", {
    "msgtype": "m.file",     # or m.image, m.audio, m.video
    "body": filename,
    "url": content_uri,
})
```

### YAML config extension (target format)

```yaml
# config/matrix-agents.yaml (new format per D-02/D-03)

user_agents:
  "@user0:matrix.lambda.coredump.ru": agent-0
  "@user1:matrix.lambda.coredump.ru": agent-1

agents:
  - id: agent-0
    label: "Agent 0"
    base_url: "ws://lambda.coredump.ru:7000/agent_0/"
    workspace_path: "/agents/0/"

  - id: agent-1
    label: "Agent 1"
    base_url: "ws://lambda.coredump.ru:7000/agent_1/"
    workspace_path: "/agents/1/"
```

---

## Runtime State Inventory

> Phase includes refactoring but NOT renaming of string identifiers in user-facing data. Users interacting with the old multi-room bot will have SQLite room_meta records with old schema keys.

| Category | Items Found | Action Required |
|----------|-------------|------------------|
| Stored data (SQLite) | `lambda_matrix.db` (dev). Room meta records contain `chat_id: "C1"`, `space_id`, `redirect_room_id`, `agent_id` — from old multi-room flow. | No migration. D-05 says: ignore existing Space+rooms, do not migrate. New users get DM-first. Old users' DM rooms will lack `welcomed` key — first message in DM room triggers normal message dispatch path (acceptable). |
| Stored data (SQLite) | `selected_agent_id` key in user metadata — written by `!agent` command being deleted. | No migration needed. `!agent` is gone. The new routing uses `user_agents` from YAML config. Old `selected_agent_id` values are orphaned but harmless. |
| Live service config | No external services with stored config (no n8n, no Datadog). | None. |
| OS-registered state | None. Bot runs in Docker, no launchd/systemd registration. | None. |
| Secrets/env vars | `AGENT_BASE_URL` (global) → replaced by per-agent `base_url` in YAML. `SURFACES_WORKSPACE_DIR` (global workspace) → per-agent `workspace_path` from YAML. Both env vars become deprecated for prod but remain for backward compat in dev. | Update `.env.example`. Add `.env.prod` template. |
| Build artifacts | None in prod context. Local: `.venv`, `__pycache__` — unaffected. | None. |

---

## Validation Architecture

### Test Framework

| Property | Value |
|----------|-------|
| Framework | pytest 9.0.2 + pytest-asyncio |
| Config file | `pyproject.toml` (`asyncio_mode = "auto"`) |
| Quick run command | `uv run pytest tests/adapter/matrix/ -q` |
| Full suite command | `uv run pytest tests/ -q` |

### Current Test Status (pre-Phase-05)

| File | Status | Disposition in Phase 05 |
|------|--------|-------------------------|
| test_converter.py | 14 passing | Keep as-is |
| test_files.py | 2 passing | Update for new path format |
| test_reactions.py | 2 passing | Keep as-is |
| test_restart_persistence.py | 5 passing | Keep; update if routing logic changes |
| test_routing_enforcement.py | 5 passing | Update for user_agents routing model |
| test_store.py | 2 passing | Keep as-is |
| test_agent_handler.py | failing (import?) | DELETE — !agent is deleted |
| test_agent_registry.py | failing (import?) | REWRITE — test new AgentDefinition schema |
| test_chat_space.py | failing | DELETE — Space provisioning deleted |
| test_confirm.py | failing | Keep or update |
| test_context_commands.py | 4 failing | REWRITE — !save/!load deleted; keep !context, add !clear |
| test_dispatcher.py | 20 failing | REWRITE — DM-first flow replaces multi-room |
| test_invite_space.py | 3 failing | DELETE and REPLACE with DM-first invite tests |
| test_routed_platform.py | 1 failing | REWRITE — user_agents lookup replaces room binding |
| test_send_outgoing.py | failing | REWRITE — per-agent workspace_path |

### Phase Requirements → Test Map

| Behavior | Test Type | Automated Command | Wave |
|----------|-----------|-------------------|------|
| AgentRegistry parses new YAML format (user_agents + base_url/workspace_path) | unit | `uv run pytest tests/adapter/matrix/test_agent_registry.py -x` | Wave 1 |
| Unauthorized user gets access-denied message on invite | unit | `uv run pytest tests/adapter/matrix/test_invite_dm.py -x` | Wave 2 |
| Authorized user gets welcome on DM invite | unit | `uv run pytest tests/adapter/matrix/test_invite_dm.py -x` | Wave 2 |
| Message from authorized user routes to correct delegate | unit | `uv run pytest tests/adapter/matrix/test_routed_platform.py -x` | Wave 2 |
| Incoming file saved to `incoming/{filename}` under agent workspace | unit | `uv run pytest tests/adapter/matrix/test_files.py -x` | Wave 3 |
| !clear command returns "Контекст сброшен." | unit | `uv run pytest tests/adapter/matrix/test_context_commands.py -x` | Wave 2 |
| Full suite green | integration | `uv run pytest tests/ -q` | Phase gate |

### Wave 0 Gaps

- [ ] `tests/adapter/matrix/test_invite_dm.py` — DM-first invite flow (new file)
- [ ] Updated `tests/adapter/matrix/test_agent_registry.py` — new schema

*(All other existing test infrastructure is in place. No new framework install needed.)*

---

## Environment Availability

| Dependency | Required By | Available | Version | Fallback |
|------------|------------|-----------|---------|----------|
| uv / Python 3.11 | tests, bot run | ✓ | Python 3.11.9, pytest 9.0.2 | — |
| Docker | docker-compose.prod.yml | ✓ (assumed dev machine) | — | Manual install |
| matrix-nio | Matrix adapter | ✓ | installed in .venv | — |
| pyyaml | agent_registry.py | ✓ | installed (yaml import works in bot context) | — |
| lambda-agent:latest image | docker-compose.prod.yml | ✗ | placeholder — platform team owns | Use `build: ./external/platform-agent` for local testing |

**Missing dependencies with no fallback:**
- `lambda-agent:latest` — docker-compose.prod.yml uses this as placeholder image. For actual testing, use `build: ./external/platform-agent` fallback or `image: busybox` stub.

---

## Open Questions

1. **is_direct detection for group room rejection (D-05, Claude's Discretion)**
   - What we know: matrix-nio's `InviteMemberEvent` does not expose `is_direct` flag directly. The `MatrixRoom` type has member count accessible via `room.member_count` or `room.joined_members`.
   - What's unclear: Whether InviteMemberEvent or MatrixRoom in nio exposes enough to reliably detect DM vs. group at invite time.
   - Recommendation: At Phase 05, accept all invites and immediately check user_agents authorization. Non-DM group rooms where the bot is invited by an authorized user will also work (no harm). Add `room.member_count <= 2` check if desired.

2. **True !clear semantics with MemorySaver**
   - What we know: `RealPlatformClient._build_chat_api` creates a new `AgentApi(chat_id="0")` per request. The agent's `MemorySaver` is keyed by `chat_id` — always `"0"`. So context is NOT cleared by reconnecting.
   - What's unclear: Whether `!clear` should work "for real" (requires platform to support a reset endpoint or different chat_id) or just show a user-facing message (MVP-acceptable).
   - Recommendation: Phase 05 sends "Контекст сброшен." immediately (D-11). Document the limitation. Actual context reset is a platform concern.

3. **lambda-agent:latest image name**
   - What we know: D-08 says "placeholder image `lambda-agent:latest` — уточнить у Азамата".
   - Recommendation: Use `lambda-agent:latest` as image name in docker-compose.prod.yml. Add a comment indicating it's a placeholder. Provide `build:` fallback pointing to `./external/platform-agent` for local dev validation.

---

## Assumptions Log

| # | Claim | Section | Risk if Wrong |
|---|-------|---------|---------------|
| A1 | `lambda-agent:latest` is the agreed image name for the agent container | docker-compose section | docker-compose.prod.yml won't work; easy to fix by updating image name |
| A2 | Group room invite detection is not required for Phase 05 (DM-first only means "start in DM", not "reject group invites") | DM-first onboarding | If group room rejection IS required, need to investigate matrix-nio InviteMemberEvent structure |
| A3 | !clear in Phase 05 is cosmetic (shows "cleared" but MemorySaver persists until agent restart) | !clear section | User confusion if they expect real context reset |

---

## Project Constraints (from CLAUDE.md)

| Directive | Implication for Phase 05 |
|-----------|--------------------------|
| Вызовы платформы — через `platform/interface.py` (Protocol) | RealPlatformClient stays the SDK boundary; AgentApi is internal to sdk/ |
| При подключении реального SDK — меняем только `platform/mock.py` | Phase 05 touches `sdk/real.py` for workspace_path — acceptable, it's a refinement not a rewrite |
| Хотфиксы (< 20 строк) → Claude Code напрямую, не Codex | Phase 05 is >20 lines; must go through Codex via GSD |
| Реализацию делает codex:rescue | Plans must be PLAN.md format passable to Codex |
| Никогда не коммить `.env` | `.env.prod` must be in `.gitignore` — only `.env.prod.example` is committed |
| `uv sync` для зависимостей | No new pip installs; all deps already in pyproject.toml |
| pytest tests/ для тестов | Phase gate: `uv run pytest tests/ -q` must be green |

---

## Sources

### Primary (HIGH confidence)
- [VERIFIED: adapter/matrix/agent_registry.py] — current AgentDefinition/AgentRegistry structure
- [VERIFIED: adapter/matrix/bot.py] — _build_platform_from_env, MatrixBot, handle_invite, _materialize_incoming_attachments
- [VERIFIED: adapter/matrix/routed_platform.py] — _resolve_delegate logic
- [VERIFIED: adapter/matrix/files.py] — build_workspace_attachment_path, download_matrix_attachment
- [VERIFIED: adapter/matrix/handlers/agent.py] — !agent handler (to be deleted)
- [VERIFIED: adapter/matrix/handlers/auth.py] — provision_workspace_chat (to be replaced)
- [VERIFIED: adapter/matrix/handlers/context_commands.py] — !save/!load/!reset handlers
- [VERIFIED: adapter/matrix/handlers/__init__.py] — handler registration
- [VERIFIED: sdk/real.py] — RealPlatformClient, _build_chat_api, _attachment_from_send_file_event
- [VERIFIED: sdk/upstream_agent_api.py] — sys.path patching, AgentApi import
- [VERIFIED: external/platform-agent_api/lambda_agent_api/agent_api.py] — actual AgentApi implementation
- [VERIFIED: config/matrix-agents.yaml] — current format
- [VERIFIED: docker-compose.yml] — existing dev compose topology
- [VERIFIED: .env.example] — current env var set
- [VERIFIED: docs/deploy-architecture.md] — prod topology spec
- [VERIFIED: .planning/phases/05-mvp-deployment/05-CONTEXT.md] — locked decisions

### Secondary (MEDIUM confidence)
- [ASSUMED: A1] lambda-agent image name — from CONTEXT.md D-08 description
- [ASSUMED: A2] Group room handling scope — inferred from D-05 wording

---

## Metadata

**Confidence breakdown:**
- Standard stack: HIGH — all libraries verified in existing code
- Architecture patterns: HIGH — all patterns verified against actual source files
- Pitfalls: HIGH — all pitfalls derived from reading actual code, not from training assumptions
- Test strategy: HIGH — test files enumerated and statuses verified by running pytest

**Research date:** 2026-04-27
**Valid until:** 2026-05-27 (stable codebase; short-circuit if platform-agent_api changes)