From 1dffaae822083c813c77f86374d23770142ba2d4 Mon Sep 17 00:00:00 2001
From: vitya <vitya.kuznetsov@gmail.com>
Date: Mon, 4 May 2026 08:50:04 +0300
Subject: [PATCH] =?UTF-8?q?feat:=20Phase=202=20=E2=80=94=20web=20server,?=
 =?UTF-8?q?=20REST=20API,=20WebSocket/SSE,=20UI=20[v0.2.0]?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

AsyncEventBridge bridges sync EventEmitter to asyncio consumers.
FastAPI app with session management, discussion control, roles/providers.
WebSocket for real-time events + inject, SSE for read-only streaming.
Minimal dark-theme HTML/JS UI. `meeting-room serve` CLI subcommand.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 .tasks/STATUS.md               |  39 ++-
 .tasks/v2-p2-async-bridge.md   |  26 ++
 .tasks/v2-p2-fastapi-app.md    |  22 ++
 .tasks/v2-p2-serve-command.md  |  17 ++
 .tasks/v2-p2-web-ui.md         |  18 ++
 .tasks/v2-p2-websocket-sse.md  |  17 ++
 meeting_room/cli.py            |  17 ++
 meeting_room/events.py         | 124 +++++++++-
 meeting_room/server.py         | 423 +++++++++++++++++++++++++++++++++
 meeting_room/static/index.html | 306 ++++++++++++++++++++++++
 pyproject.toml                 |   2 +-
 tests/test_async_bridge.py     | 225 ++++++++++++++++++
 tests/test_server.py           | 163 +++++++++++++
 13 files changed, 1393 insertions(+), 6 deletions(-)
 create mode 100644 .tasks/v2-p2-async-bridge.md
 create mode 100644 .tasks/v2-p2-fastapi-app.md
 create mode 100644 .tasks/v2-p2-serve-command.md
 create mode 100644 .tasks/v2-p2-web-ui.md
 create mode 100644 .tasks/v2-p2-websocket-sse.md
 create mode 100644 meeting_room/server.py
 create mode 100644 meeting_room/static/index.html
 create mode 100644 tests/test_async_bridge.py
 create mode 100644 tests/test_server.py

diff --git a/.tasks/STATUS.md b/.tasks/STATUS.md
index d947a2e..1dba92b 100644
--- a/.tasks/STATUS.md
+++ b/.tasks/STATUS.md
@@ -1,6 +1,41 @@
 # Task Board
 _Updated: 2026-05-04_
 
+## 🟢 v2-p2-async-bridge — AsyncEventBridge: sync EventEmitter → asyncio.Queue
+**Status:** done
+**Where I stopped:** Complete
+**Next action:** N/A
+
+---
+
+## 🟢 v2-p2-fastapi-app — FastAPI app + REST API (sessions, start, inject, roles, providers)
+**Status:** done
+**Where I stopped:** Complete
+**Next action:** N/A
+
+---
+
+## 🟢 v2-p2-websocket-sse — WebSocket + SSE streaming endpoints
+**Status:** done
+**Where I stopped:** Complete
+**Next action:** N/A
+
+---
+
+## 🟢 v2-p2-web-ui — Minimal HTML/CSS/JS frontend
+**Status:** done
+**Where I stopped:** Complete
+**Next action:** N/A
+
+---
+
+## 🟢 v2-p2-serve-command — `meeting-room serve` CLI subcommand
+**Status:** done
+**Where I stopped:** Complete
+**Next action:** N/A
+
+---
+
 ## 🟢 v2-p1-deps — Обновить зависимости (pydantic, pytest, [web])
 **Status:** done
 **Branch:** feat/v2-phase1-core-refactor
@@ -44,8 +79,8 @@ _Updated: 2026-05-04_
 ---
 
 <!--
-  Фаза 1 завершена! Фаза 2 (Web-сервер) задачи будут добавлены.
-
+  Фаза 2 завершена! Все таски выполнены.
+  
   Статусы:
     🔴 Active     — только одна одновременно
     🟡 Paused     — в процессе, возобновима
diff --git a/.tasks/v2-p2-async-bridge.md b/.tasks/v2-p2-async-bridge.md
new file mode 100644
index 0000000..109050e
--- /dev/null
+++ b/.tasks/v2-p2-async-bridge.md
@@ -0,0 +1,26 @@
+# v2-p2-async-bridge
+
+## Goal
+Bridge synchronous EventEmitter to asyncio so DiscussionEngine can run in a thread while WebSocket/SSE consumers receive events asynchronously.
+
+## Key files
+- `meeting_room/events.py` — add AsyncEventBridge class
+- `meeting_room/engine.py` — no changes (runs in thread as-is)
+
+## Decisions log
+- 2026-05-04: AsyncEventBridge + asyncio.to_thread() chosen over async engine rewrite. Minimizes changes, engine stays sync.
+
+## Open questions
+- [ ] None
+
+## Completed steps
+- [x] AsyncEventBridge class in events.py
+- [x] Thread-safe bridge with call_soon_threadsafe
+- [x] subscribe/unsubscribe consumer queues
+- [x] Drop policy on full queues
+- [x] Tests (10/10 passing)
+
+## Notes
+- events.py already has comment: "In Phase 2, an AsyncEventBridge will forward events to WebSocket clients"
+- Bridge subscribes to sync EventEmitter, puts events into asyncio.Queue
+- Consumers (WebSocket handlers, SSE handlers) read from the queue
\ No newline at end of file
diff --git a/.tasks/v2-p2-fastapi-app.md b/.tasks/v2-p2-fastapi-app.md
new file mode 100644
index 0000000..5131e04
--- /dev/null
+++ b/.tasks/v2-p2-fastapi-app.md
@@ -0,0 +1,22 @@
+# v2-p2-fastapi-app
+
+## Goal
+Create FastAPI application with REST API endpoints for session management and discussion control.
+
+## Key files
+- `meeting_room/server.py` — FastAPI app, routes, session store
+
+## Decisions log
+- 2026-05-04: In-memory session store (dict). Persistent storage deferred.
+- 2026-05-04: REST routes under /api prefix, WebSocket/SSE on root
+
+## Open questions
+- [ ] None
+
+## Completed steps
+- [x] FastAPI app with lifespan handler
+- [x] Session + SessionStore models
+- [x] REST endpoints: POST /api/sessions, GET /api/sessions, GET /api/sessions/{id}, POST /api/sessions/{id}/start, POST /api/sessions/{id}/inject, GET /api/sessions/{id}/messages
+- [x] GET /api/roles, GET /api/providers
+- [x] Session start runs engine in asyncio.to_thread
+- [x] Tests (12 passing)
\ No newline at end of file
diff --git a/.tasks/v2-p2-serve-command.md b/.tasks/v2-p2-serve-command.md
new file mode 100644
index 0000000..7e6c397
--- /dev/null
+++ b/.tasks/v2-p2-serve-command.md
@@ -0,0 +1,17 @@
+# v2-p2-serve-command
+
+## Goal
+Add `meeting-room serve` CLI subcommand that starts the FastAPI web server.
+
+## Key files
+- `meeting_room/cli.py` — serve subcommand added
+
+## Decisions log
+- 2026-05-04: Default port 8000, configurable via --port. --host and --reload flags.
+
+## Open questions
+- [ ] None
+
+## Completed steps
+- [x] `meeting-room serve` subcommand with --host, --port, --reload
+- [x] Starts uvicorn with the FastAPI app
\ No newline at end of file
diff --git a/.tasks/v2-p2-web-ui.md b/.tasks/v2-p2-web-ui.md
new file mode 100644
index 0000000..ebc788f
--- /dev/null
+++ b/.tasks/v2-p2-web-ui.md
@@ -0,0 +1,18 @@
+# v2-p2-web-ui
+
+## Goal
+Minimal HTML/CSS/JS frontend for viewing and interacting with discussions.
+
+## Key files
+- `meeting_room/static/index.html` — single-page UI
+
+## Decisions log
+- 2026-05-04: Vanilla JS + WebSocket API. No framework.
+
+## Open questions
+- [ ] None
+
+## Completed steps
+- [x] Dark theme UI with WebSocket event handling
+- [x] Start discussion, view messages, inject messages
+- [x] Served from /static/index.html, / redirects
\ No newline at end of file
diff --git a/.tasks/v2-p2-websocket-sse.md b/.tasks/v2-p2-websocket-sse.md
new file mode 100644
index 0000000..731dad1
--- /dev/null
+++ b/.tasks/v2-p2-websocket-sse.md
@@ -0,0 +1,17 @@
+# v2-p2-websocket-sse
+
+## Goal
+Stream discussion events to browser clients via WebSocket and SSE endpoints.
+
+## Key files
+- `meeting_room/server.py` — WebSocket and SSE route handlers
+
+## Decisions log
+- 2026-05-04: WebSocket for bidirectional (events + inject), SSE for read-only
+
+## Open questions
+- [ ] None
+
+## Completed steps
+- [x] WebSocket endpoint: /ws/{session_id} — bidirectional events + inject
+- [x] SSE endpoint: /events/{session_id} — read-only event stream
\ No newline at end of file
diff --git a/meeting_room/cli.py b/meeting_room/cli.py
index 2896ba7..75132f6 100644
--- a/meeting_room/cli.py
+++ b/meeting_room/cli.py
@@ -426,6 +426,11 @@ def main():
     init_parser = subparsers.add_parser("init", help="Initialize .meeting-room workspace")
     init_parser.add_argument("path", nargs="?", default=".", help="Where to create .meeting-room")
 
+    serve_parser = subparsers.add_parser("serve", help="Start web server")
+    serve_parser.add_argument("--host", default="0.0.0.0", help="Host to bind (default: 0.0.0.0)")
+    serve_parser.add_argument("--port", type=int, default=8000, help="Port to bind (default: 8000)")
+    serve_parser.add_argument("--reload", action="store_true", help="Enable auto-reload for development")
+
     args = parser.parse_args()
 
     # Handle init command
@@ -433,6 +438,18 @@ def main():
         init_workspace(args.path)
         return
 
+    # Handle serve command
+    if args.command == "serve":
+        import uvicorn
+        from meeting_room.server import app
+        uvicorn.run(
+            "meeting_room.server:app" if args.reload else app,
+            host=args.host,
+            port=args.port,
+            reload=args.reload,
+        )
+        return
+
     # Find config: CLI arg > .meeting-room/config.yaml > package default
     if args.config:
         config = load_config(args.config)
diff --git a/meeting_room/events.py b/meeting_room/events.py
index a520261..f5832a6 100644
--- a/meeting_room/events.py
+++ b/meeting_room/events.py
@@ -1,12 +1,14 @@
 """EventEmitter and event types for the Meeting Room discussion engine.
 
-Synchronous event bus. In Phase 2, an AsyncEventBridge will forward
-events to WebSocket clients.
+Synchronous event bus with AsyncEventBridge for forwarding events
+to asyncio consumers (WebSocket / SSE).
 """
 
 from __future__ import annotations
 
+import asyncio
 import logging
+import threading
 from dataclasses import dataclass, field
 from datetime import datetime
 from typing import Any, Callable
@@ -126,4 +128,120 @@ class EventEmitter:
 
     def clear(self) -> None:
         """Remove all subscriptions."""
-        self._handlers.clear()
\ No newline at end of file
+        self._handlers.clear()
+
+
+# ---------------------------------------------------------------------------
+# AsyncEventBridge
+# ---------------------------------------------------------------------------
+
+# All event types the bridge forwards.
+_ALL_EVENT_TYPES = [
+    DISCUSSION_START,
+    ROUND_START,
+    AGENT_TURN_START,
+    AGENT_MESSAGE,
+    TOOL_CALL,
+    TOOL_RESULT,
+    AGENT_ERROR,
+    ROUND_END,
+    DISCUSSION_END,
+    BOSS_TURN,
+]
+
+
+class AsyncEventBridge:
+    """Bridges synchronous EventEmitter events to asyncio consumers.
+
+    Subscribes to all event types on a sync ``EventEmitter`` and forwards
+    each event into ``asyncio.Queue`` objects — one per consumer. Designed
+    for running ``DiscussionEngine`` in a worker thread via
+    ``asyncio.to_thread()`` while WebSocket / SSE handlers await events
+    on the async side.
+
+    Usage::
+
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        bridge.start(asyncio.get_event_loop())
+
+        # In an async handler:
+        queue = bridge.subscribe()
+        try:
+            while True:
+                event = await queue.get()
+                await websocket.send_json(event)
+        finally:
+            bridge.unsubscribe(queue)
+
+        # Run engine in a thread:
+        await asyncio.to_thread(engine.run, scenario)
+
+        # Cleanup:
+        bridge.stop()
+    """
+
+    def __init__(self, event_bus: EventEmitter) -> None:
+        self._bus = event_bus
+        self._loop: asyncio.AbstractEventLoop | None = None
+        self._queues: list[asyncio.Queue[dict]] = []
+        self._lock = threading.Lock()
+        self._handler = self._on_sync_event
+
+    # -- lifecycle -----------------------------------------------------------
+
+    def start(self, loop: asyncio.AbstractEventLoop) -> None:
+        """Subscribe to all event types on the bus."""
+        self._loop = loop
+        for event_type in _ALL_EVENT_TYPES:
+            self._bus.on(event_type, self._handler)
+
+    def stop(self) -> None:
+        """Unsubscribe from all event types."""
+        for event_type in _ALL_EVENT_TYPES:
+            self._bus.off(event_type, self._handler)
+
+    # -- consumer management ------------------------------------------------
+
+    def subscribe(self) -> asyncio.Queue[dict]:
+        """Create a consumer queue that receives all events.
+
+        Call from async context. The caller owns the queue and must
+        call ``unsubscribe()`` when done.
+        """
+        q: asyncio.Queue[dict] = asyncio.Queue(maxsize=1000)
+        with self._lock:
+            self._queues.append(q)
+        return q
+
+    def unsubscribe(self, q: asyncio.Queue[dict]) -> None:
+        """Remove a consumer queue. Safe to call multiple times."""
+        with self._lock:
+            try:
+                self._queues.remove(q)
+            except ValueError:
+                pass
+
+    # -- internal ------------------------------------------------------------
+
+    def _on_sync_event(self, event: Event) -> None:
+        """Sync handler called by EventEmitter on any thread."""
+        payload = {
+            "type": event.type,
+            "data": event.data,
+            "timestamp": event.timestamp.isoformat(),
+        }
+        if self._loop is None or not self._loop.is_running():
+            return
+        with self._lock:
+            queues = list(self._queues)
+        for q in queues:
+            self._loop.call_soon_threadsafe(self._safe_put, q, payload)
+
+    @staticmethod
+    def _safe_put(q: asyncio.Queue[dict], payload: dict) -> None:
+        """Put payload into queue, dropping if full."""
+        try:
+            q.put_nowait(payload)
+        except asyncio.QueueFull:
+            logger.warning("AsyncEventBridge: dropping event, queue full")
\ No newline at end of file
diff --git a/meeting_room/server.py b/meeting_room/server.py
new file mode 100644
index 0000000..210cfef
--- /dev/null
+++ b/meeting_room/server.py
@@ -0,0 +1,423 @@
+"""FastAPI web server for Meeting Room — REST API, WebSocket, and SSE endpoints."""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+import uuid
+from contextlib import asynccontextmanager
+from typing import Any
+
+from fastapi import APIRouter, FastAPI, HTTPException, WebSocket, WebSocketDisconnect
+from fastapi.responses import RedirectResponse, StreamingResponse
+from fastapi.staticfiles import StaticFiles
+from pydantic import BaseModel
+
+from meeting_room.api_client import APIClient
+from meeting_room.config import load_config, load_discussion_config, find_workspace_config
+from meeting_room.engine import DiscussionEngine
+from meeting_room.events import AsyncEventBridge, EventEmitter
+from meeting_room.models import DiscussionConfig, ProviderConfig
+from meeting_room.scenario_loader import load_scenario
+from meeting_room.tools import ToolRegistry
+
+logger = logging.getLogger(__name__)
+
+# ---------------------------------------------------------------------------
+# Pydantic models for API request/response
+# ---------------------------------------------------------------------------
+
+
+class StartDiscussionRequest(BaseModel):
+    """Request body for starting a discussion."""
+
+    scenario: str  # scenario file path or name
+    config: str | None = None  # optional config path override
+    save: bool = False
+
+
+class InjectMessageRequest(BaseModel):
+    """Request body for injecting a message."""
+
+    role_id: str
+    content: str
+
+
+class SessionResponse(BaseModel):
+    """Response for session creation."""
+
+    id: str
+    status: str
+
+
+class SessionDetailResponse(BaseModel):
+    """Response for session detail."""
+
+    id: str
+    status: str
+    scenario_name: str | None = None
+    message_count: int = 0
+
+
+# ---------------------------------------------------------------------------
+# Session store
+# ---------------------------------------------------------------------------
+
+
+class Session:
+    """Holds state for a single discussion session."""
+
+    def __init__(
+        self,
+        session_id: str,
+        config: dict,
+        discussion_config: DiscussionConfig,
+    ) -> None:
+        self.id = session_id
+        self.config = config
+        self.discussion_config = discussion_config
+        self.status: str = "created"  # created | running | completed | error
+        self.scenario_name: str | None = None
+        self.messages: list[dict] = []
+        self.event_bus = EventEmitter()
+        self.bridge = AsyncEventBridge(self.event_bus)
+        self._engine_task: asyncio.Task | None = None
+
+    def build_engine(self) -> DiscussionEngine:
+        providers = {
+            name: ProviderConfig(**vals)
+            for name, vals in self.config.get("providers", {}).items()
+        }
+        api_client = APIClient(providers=providers)
+        tool_registry = ToolRegistry(workdir=self.discussion_config.defaults.workdir)
+        return DiscussionEngine(
+            config=self.discussion_config,
+            api_client=api_client,
+            tool_registry=tool_registry,
+            events=self.event_bus,
+        )
+
+
+class SessionStore:
+    """In-memory session store."""
+
+    def __init__(self) -> None:
+        self._sessions: dict[str, Session] = {}
+
+    def create(self, config: dict, discussion_config: DiscussionConfig) -> Session:
+        session_id = uuid.uuid4().hex[:12]
+        session = Session(session_id, config, discussion_config)
+        self._sessions[session_id] = session
+        return session
+
+    def get(self, session_id: str) -> Session | None:
+        return self._sessions.get(session_id)
+
+    def list_sessions(self) -> list[Session]:
+        return list(self._sessions.values())
+
+
+# ---------------------------------------------------------------------------
+# Application factory
+# ---------------------------------------------------------------------------
+
+store = SessionStore()
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Startup/shutdown lifecycle."""
+    logger.info("Meeting Room server started")
+    yield
+    # Cleanup: cancel any running engine tasks
+    for session in store.list_sessions():
+        if session._engine_task and not session._engine_task.done():
+            session._engine_task.cancel()
+    logger.info("Meeting Room server stopped")
+
+
+app = FastAPI(
+    title="Meeting Room",
+    version="0.2.0",
+    description="Multi-agent discussion framework — REST API and WebSocket",
+    lifespan=lifespan,
+)
+
+# Serve static files (web UI)
+import os
+_static_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)), "static")
+app.mount("/static", StaticFiles(directory=_static_dir), name="static")
+
+
+@app.get("/")
+async def index():
+    """Redirect to the web UI."""
+    from fastapi.responses import RedirectResponse
+    return RedirectResponse(url="/static/index.html")
+
+
+# ---------------------------------------------------------------------------
+# Helper
+# ---------------------------------------------------------------------------
+
+
+def _load_config_or_default(config_path: str | None) -> dict:
+    """Load config from path, workspace, or package default."""
+    if config_path:
+        return load_config(config_path)
+    ws_config = find_workspace_config()
+    if ws_config:
+        return load_config(ws_config)
+    return load_config()
+
+
+# ---------------------------------------------------------------------------
+# REST API (mounted at /api)
+# ---------------------------------------------------------------------------
+
+api = APIRouter(prefix="/api")
+
+
+@api.post("/sessions", response_model=SessionResponse)
+async def create_session(config: str | None = None):
+    """Create a new discussion session."""
+    raw_config = _load_config_or_default(config)
+    discussion_config = load_discussion_config()
+    session = store.create(raw_config, discussion_config)
+    return SessionResponse(id=session.id, status=session.status)
+
+
+@api.get("/sessions", response_model=list[SessionDetailResponse])
+async def list_sessions():
+    """List all sessions."""
+    sessions = store.list_sessions()
+    return [
+        SessionDetailResponse(
+            id=s.id,
+            status=s.status,
+            scenario_name=s.scenario_name,
+            message_count=len(s.messages),
+        )
+        for s in sessions
+    ]
+
+
+@api.get("/sessions/{session_id}", response_model=SessionDetailResponse)
+async def get_session(session_id: str):
+    """Get session details."""
+    session = store.get(session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    return SessionDetailResponse(
+        id=session.id,
+        status=session.status,
+        scenario_name=session.scenario_name,
+        message_count=len(session.messages),
+    )
+
+
+@api.post("/sessions/{session_id}/start", response_model=SessionDetailResponse)
+async def start_discussion(session_id: str, body: StartDiscussionRequest):
+    """Start a discussion in a session."""
+    session = store.get(session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    if session.status == "running":
+        raise HTTPException(status_code=409, detail="Discussion already running")
+
+    # Load scenario
+    import os
+    scenario_path = body.scenario
+    if not os.path.isabs(scenario_path):
+        scenario_path = os.path.join(os.getcwd(), scenario_path)
+    if not os.path.exists(scenario_path):
+        scenario_path = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)), "scenarios", body.scenario
+        )
+    if not os.path.exists(scenario_path):
+        raise HTTPException(status_code=404, detail=f"Scenario not found: {body.scenario}")
+
+    scenario_data = load_scenario(scenario_path)
+    session.scenario_name = scenario_data.get("name", "Untitled")
+
+    # Rebuild config if overridden
+    if body.config:
+        raw_config = _load_config_or_default(body.config)
+        discussion_config = load_discussion_config()
+        session.config = raw_config
+        session.discussion_config = discussion_config
+
+    # Start the bridge
+    loop = asyncio.get_event_loop()
+    session.bridge.start(loop)
+
+    # Subscribe a handler to collect messages
+    from meeting_room.events import AGENT_MESSAGE, BOSS_TURN, AGENT_ERROR
+
+    def collect_message(event):
+        session.messages.append({
+            "role_id": event.data.get("role_id", ""),
+            "name": event.data.get("name", ""),
+            "content": event.data.get("content", event.data.get("error", "")),
+        })
+
+    session.event_bus.on(AGENT_MESSAGE, collect_message)
+    session.event_bus.on(BOSS_TURN, collect_message)
+    session.event_bus.on(AGENT_ERROR, collect_message)
+
+    # Run engine in a thread
+    engine = session.build_engine()
+    session.status = "running"
+
+    async def run_engine():
+        try:
+            await asyncio.to_thread(engine.run, scenario_data)
+            session.status = "completed"
+        except Exception as exc:
+            logger.exception("Engine error in session %s", session.id)
+            session.status = "error"
+        finally:
+            session.bridge.stop()
+
+    session._engine_task = asyncio.create_task(run_engine())
+
+    return SessionDetailResponse(
+        id=session.id,
+        status=session.status,
+        scenario_name=session.scenario_name,
+        message_count=0,
+    )
+
+
+@api.post("/sessions/{session_id}/inject", response_model=dict)
+async def inject_message(session_id: str, body: InjectMessageRequest):
+    """Inject a message from a Boss/CSO role."""
+    session = store.get(session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    if session.status != "running":
+        raise HTTPException(status_code=409, detail="Session is not running")
+
+    engine = session.build_engine()
+    msg = engine.inject_message(body.role_id, body.content)
+    session.messages.append({
+        "role_id": msg.role_id,
+        "name": msg.name,
+        "content": msg.content,
+    })
+
+    return {"role_id": msg.role_id, "name": msg.name, "content": msg.content}
+
+
+@api.get("/sessions/{session_id}/messages")
+async def get_messages(session_id: str):
+    """Get all messages in a session."""
+    session = store.get(session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+    return session.messages
+
+
+@api.get("/roles")
+async def list_roles(config: str | None = None):
+    """List available roles and model bindings."""
+    raw_config = _load_config_or_default(config)
+    return raw_config.get("roles", {})
+
+
+@api.get("/providers")
+async def list_providers(config: str | None = None):
+    """List configured providers."""
+    raw_config = _load_config_or_default(config)
+    return raw_config.get("providers", {})
+
+
+# Mount API router
+app.include_router(api)
+
+
+# ---------------------------------------------------------------------------
+# WebSocket
+# ---------------------------------------------------------------------------
+
+
+@app.websocket("/ws/{session_id}")
+async def websocket_endpoint(websocket: WebSocket, session_id: str):
+    """WebSocket endpoint for real-time event streaming and message injection."""
+    session = store.get(session_id)
+    if not session:
+        await websocket.close(code=4004, reason="Session not found")
+        return
+
+    await websocket.accept()
+    queue = session.bridge.subscribe()
+
+    try:
+        # Task: forward events from queue to WebSocket
+        async def send_events():
+            try:
+                while True:
+                    event = await queue.get()
+                    await websocket.send_json(event)
+            except asyncio.CancelledError:
+                pass
+
+        send_task = asyncio.create_task(send_events())
+
+        # Listen for incoming messages (inject)
+        try:
+            while True:
+                data = await websocket.receive_json()
+                if data.get("type") == "inject":
+                    role_id = data.get("role_id", "boss")
+                    content = data.get("content", "")
+                    engine = session.build_engine()
+                    msg = engine.inject_message(role_id, content)
+                    session.messages.append({
+                        "role_id": msg.role_id,
+                        "name": msg.name,
+                        "content": msg.content,
+                    })
+        except WebSocketDisconnect:
+            pass
+        finally:
+            send_task.cancel()
+            session.bridge.unsubscribe(queue)
+    except Exception:
+        session.bridge.unsubscribe(queue)
+
+
+# ---------------------------------------------------------------------------
+# SSE
+# ---------------------------------------------------------------------------
+
+
+@app.get("/events/{session_id}")
+async def sse_endpoint(session_id: str):
+    """SSE endpoint for read-only event streaming."""
+    session = store.get(session_id)
+    if not session:
+        raise HTTPException(status_code=404, detail="Session not found")
+
+    async def event_generator():
+        queue = session.bridge.subscribe()
+        try:
+            while True:
+                event = await queue.get()
+                # SSE format
+                import json
+                yield f"data: {json.dumps(event)}\n\n"
+        except asyncio.CancelledError:
+            pass
+        finally:
+            session.bridge.unsubscribe(queue)
+
+    return StreamingResponse(
+        event_generator(),
+        media_type="text/event-stream",
+        headers={
+            "Cache-Control": "no-cache",
+            "Connection": "keep-alive",
+            "X-Accel-Buffering": "no",
+        },
+    )
\ No newline at end of file
diff --git a/meeting_room/static/index.html b/meeting_room/static/index.html
new file mode 100644
index 0000000..bc82388
--- /dev/null
+++ b/meeting_room/static/index.html
@@ -0,0 +1,306 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Meeting Room</title>
+    <style>
+        :root {
+            --bg: #1a1a2e;
+            --surface: #16213e;
+            --card: #0f3460;
+            --border: #533483;
+            --accent: #e94560;
+            --text: #eee;
+            --muted: #999;
+        }
+        * { margin: 0; padding: 0; box-sizing: border-box; }
+        body {
+            font-family: 'Segoe UI', system-ui, sans-serif;
+            background: var(--bg);
+            color: var(--text);
+            min-height: 100vh;
+        }
+        header {
+            background: var(--surface);
+            padding: 1rem 2rem;
+            border-bottom: 2px solid var(--border);
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+        }
+        header h1 { font-size: 1.4rem; }
+        header .status {
+            font-size: 0.85rem;
+            color: var(--muted);
+        }
+        .status .dot {
+            display: inline-block;
+            width: 8px; height: 8px;
+            border-radius: 50%;
+            margin-right: 4px;
+        }
+        .dot.connected { background: #4caf50; }
+        .dot.disconnected { background: var(--accent); }
+        main {
+            max-width: 900px;
+            margin: 2rem auto;
+            padding: 0 1rem;
+        }
+        .panel {
+            background: var(--surface);
+            border: 1px solid var(--border);
+            border-radius: 8px;
+            padding: 1.5rem;
+            margin-bottom: 1.5rem;
+        }
+        .panel h2 {
+            font-size: 1.1rem;
+            margin-bottom: 1rem;
+            color: var(--accent);
+        }
+        .controls {
+            display: flex;
+            gap: 0.5rem;
+            flex-wrap: wrap;
+            align-items: center;
+        }
+        select, input, button {
+            font-size: 0.9rem;
+            padding: 0.5rem 0.75rem;
+            border: 1px solid var(--border);
+            border-radius: 4px;
+            background: var(--card);
+            color: var(--text);
+        }
+        button {
+            cursor: pointer;
+            border-color: var(--accent);
+            transition: background 0.2s;
+        }
+        button:hover { background: var(--accent); }
+        button:disabled { opacity: 0.5; cursor: not-allowed; }
+        #messages {
+            max-height: 60vh;
+            overflow-y: auto;
+            padding: 0.5rem 0;
+        }
+        .msg {
+            padding: 0.75rem 1rem;
+            margin: 0.5rem 0;
+            border-radius: 6px;
+            background: var(--card);
+            border-left: 3px solid var(--border);
+            animation: fadeIn 0.3s;
+        }
+        .msg .name {
+            font-weight: 600;
+            color: var(--accent);
+            font-size: 0.85rem;
+        }
+        .msg .content {
+            margin-top: 0.3rem;
+            white-space: pre-wrap;
+            font-size: 0.9rem;
+            line-height: 1.5;
+        }
+        .msg.tool-call {
+            border-left-color: #ff9800;
+            font-size: 0.8rem;
+            color: var(--muted);
+        }
+        .msg.error {
+            border-left-color: #f44336;
+        }
+        .inject-bar {
+            display: flex;
+            gap: 0.5rem;
+            margin-top: 1rem;
+        }
+        .inject-bar input { flex: 1; }
+        @keyframes fadeIn {
+            from { opacity: 0; transform: translateY(4px); }
+            to { opacity: 1; transform: translateY(0); }
+        }
+        .round-marker {
+            text-align: center;
+            color: var(--muted);
+            font-size: 0.8rem;
+            padding: 0.5rem;
+            border-bottom: 1px solid var(--border);
+        }
+    </style>
+</head>
+<body>
+    <header>
+        <h1>Meeting Room</h1>
+        <div class="status">
+            <span class="dot disconnected" id="statusDot"></span>
+            <span id="statusText">Disconnected</span>
+        </div>
+    </header>
+    <main>
+        <div class="panel">
+            <h2>Start Discussion</h2>
+            <div class="controls">
+                <select id="scenarioSelect">
+                    <option value="">Loading scenarios...</option>
+                </select>
+                <button id="startBtn" onclick="startSession()">Start</button>
+            </div>
+        </div>
+
+        <div class="panel" id="chatPanel" style="display:none">
+            <h2 id="sessionTitle">Discussion</h2>
+            <div id="messages"></div>
+            <div class="inject-bar">
+                <input id="injectRole" placeholder="Role (boss)" value="boss" style="width:120px">
+                <input id="injectText" placeholder="Inject message..." onkeydown="if(event.key==='Enter')injectMessage()">
+                <button onclick="injectMessage()">Send</button>
+            </div>
+        </div>
+    </main>
+
+    <script>
+        let ws = null;
+        let sessionId = null;
+
+        // --- API helpers ---
+        async function api(path, opts = {}) {
+            const res = await fetch(`/api${path}`, {
+                headers: { 'Content-Type': 'application/json' },
+                ...opts,
+            });
+            if (!res.ok) throw new Error(`${res.status}: ${await res.text()}`);
+            return res.json();
+        }
+
+        // --- Load scenarios (placeholder) ---
+        // In a full implementation, we'd load from /api/scenarios
+        // For now, scenarios are provided by path
+
+        // --- Create and start session ---
+        async function startSession() {
+            const scenario = document.getElementById('scenarioSelect').value;
+            if (!scenario) return alert('Select a scenario first');
+
+            try {
+                // Create session
+                const sess = await api('/sessions', { method: 'POST' });
+                sessionId = sess.id;
+
+                // Start discussion
+                await api(`/sessions/${sessionId}/start`, {
+                    method: 'POST',
+                    body: JSON.stringify({ scenario }),
+                });
+
+                // Connect WebSocket
+                connectWS(sessionId);
+
+                document.getElementById('chatPanel').style.display = 'block';
+                document.getElementById('startBtn').disabled = true;
+            } catch (e) {
+                alert('Error: ' + e.message);
+            }
+        }
+
+        // --- WebSocket ---
+        function connectWS(sid) {
+            const proto = location.protocol === 'https:' ? 'wss' : 'ws';
+            ws = new WebSocket(`${proto}://${location.host}/ws/${sid}`);
+
+            ws.onopen = () => {
+                document.getElementById('statusDot').className = 'dot connected';
+                document.getElementById('statusText').textContent = 'Connected';
+            };
+
+            ws.onclose = () => {
+                document.getElementById('statusDot').className = 'dot disconnected';
+                document.getElementById('statusText').textContent = 'Disconnected';
+            };
+
+            ws.onmessage = (event) => {
+                const data = JSON.parse(event.data);
+                handleEvent(data);
+            };
+        }
+
+        // --- Handle events ---
+        const ROLE_COLORS = {
+            moderator: '#4fc3f7',
+            skeptic: '#ef5350',
+            idea_generator: '#66bb6a',
+            analyst: '#ffa726',
+            boss: '#ab47bc',
+            defender: '#42a5f5',
+            attacker: '#ff7043',
+            security: '#78909c',
+        };
+
+        function handleEvent(data) {
+            const container = document.getElementById('messages');
+            const type = data.type;
+            const d = data.data || {};
+
+            if (type === 'discussion_start') {
+                document.getElementById('sessionTitle').textContent = d.name || 'Discussion';
+                container.innerHTML = '';
+            } else if (type === 'round_start') {
+                const el = document.createElement('div');
+                el.className = 'round-marker';
+                el.textContent = `— Round ${d.round_num}/${d.total_rounds} —`;
+                container.appendChild(el);
+            } else if (type === 'agent_message' || type === 'boss_turn') {
+                const el = document.createElement('div');
+                el.className = 'msg';
+                const color = ROLE_COLORS[d.role_id] || '#999';
+                el.innerHTML = `<div class="name" style="color:${color}">${d.name}</div><div class="content">${escapeHtml(d.content || '')}</div>`;
+                container.appendChild(el);
+            } else if (type === 'agent_error') {
+                const el = document.createElement('div');
+                el.className = 'msg error';
+                el.innerHTML = `<div class="name">${d.name}</div><div class="content">Error: ${escapeHtml(d.error || '')}</div>`;
+                container.appendChild(el);
+            } else if (type === 'tool_call') {
+                const el = document.createElement('div');
+                el.className = 'msg tool-call';
+                el.textContent = `🔧 ${d.tool_name}(${d.arguments || ''})`;
+                container.appendChild(el);
+            } else if (type === 'discussion_end') {
+                const el = document.createElement('div');
+                el.className = 'round-marker';
+                el.textContent = `— Discussion complete (${d.total_messages} messages) —`;
+                container.appendChild(el);
+            }
+
+            container.scrollTop = container.scrollHeight;
+        }
+
+        function escapeHtml(text) {
+            const div = document.createElement('div');
+            div.textContent = text;
+            return div.innerHTML;
+        }
+
+        // --- Inject message ---
+        function injectMessage() {
+            if (!ws || ws.readyState !== WebSocket.OPEN) {
+                alert('Not connected');
+                return;
+            }
+            const role = document.getElementById('injectRole').value || 'boss';
+            const content = document.getElementById('injectText').value;
+            if (!content) return;
+
+            ws.send(JSON.stringify({ type: 'inject', role_id: role, content }));
+            document.getElementById('injectText').value = '';
+        }
+
+        // --- Init: fetch scenarios (todo: add API endpoint) ---
+        // For now, just show a text input
+        document.getElementById('scenarioSelect').outerHTML =
+            '<input id="scenarioSelect" placeholder="Scenario path (e.g. scenarios/example.md)" style="flex:1">';
+    </script>
+</body>
+</html>
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 6b871e0..55943ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-dev = ["pytest>=7.0", "pytest-mock>=3.0"]
+dev = ["pytest>=7.0", "pytest-mock>=3.0", "pytest-asyncio>=0.23"]
 web = ["fastapi>=0.100", "uvicorn>=0.20", "websockets>=11.0"]
 
 
diff --git a/tests/test_async_bridge.py b/tests/test_async_bridge.py
new file mode 100644
index 0000000..ad38f6b
--- /dev/null
+++ b/tests/test_async_bridge.py
@@ -0,0 +1,225 @@
+"""Tests for AsyncEventBridge — sync EventEmitter → asyncio.Queue bridge."""
+
+from __future__ import annotations
+
+import asyncio
+
+import pytest
+
+from meeting_room.events import (
+    AGENT_MESSAGE,
+    AGENT_TURN_START,
+    DISCUSSION_END,
+    DISCUSSION_START,
+    ROUND_END,
+    ROUND_START,
+    TOOL_CALL,
+    AsyncEventBridge,
+    EventEmitter,
+)
+
+
+class TestAsyncEventBridgeSubscribe:
+    """subscribe() creates a queue that receives events."""
+
+    @pytest.mark.asyncio
+    async def test_subscribe_returns_queue(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        q = bridge.subscribe()
+        assert isinstance(q, asyncio.Queue)
+
+    @pytest.mark.asyncio
+    async def test_multiple_subscribers(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        q1 = bridge.subscribe()
+        q2 = bridge.subscribe()
+        assert q1 is not q2
+
+
+class TestAsyncEventBridgeStartStop:
+    """start()/stop() wire the bridge to the sync bus."""
+
+    @pytest.mark.asyncio
+    async def test_start_subscribes_to_all_event_types(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        for event_type in [
+            DISCUSSION_START, ROUND_START, AGENT_TURN_START,
+            AGENT_MESSAGE, TOOL_CALL, ROUND_END, DISCUSSION_END,
+        ]:
+            assert len(bus.handlers(event_type)) == 1
+
+        bridge.stop()
+
+    @pytest.mark.asyncio
+    async def test_stop_unsubscribes(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+        bridge.stop()
+
+        for event_type in [
+            DISCUSSION_START, ROUND_START, AGENT_TURN_START,
+            AGENT_MESSAGE, TOOL_CALL, ROUND_END, DISCUSSION_END,
+        ]:
+            assert len(bus.handlers(event_type)) == 0
+
+
+class TestAsyncEventBridgeForwarding:
+    """Events emitted on the sync bus arrive in async queues."""
+
+    @pytest.mark.asyncio
+    async def test_forward_event_to_queue(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        q = bridge.subscribe()
+
+        # Emit a sync event
+        bus.emit(AGENT_MESSAGE, role_id="moderator", name="Moderator", content="Hello")
+
+        # Give the event loop a chance to process call_soon_threadsafe
+        await asyncio.sleep(0.05)
+
+        payload = q.get_nowait()
+        assert payload["type"] == AGENT_MESSAGE
+        assert payload["data"]["role_id"] == "moderator"
+        assert payload["data"]["content"] == "Hello"
+        assert "timestamp" in payload
+
+        bridge.stop()
+
+    @pytest.mark.asyncio
+    async def test_multiple_queues_receive_same_event(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        q1 = bridge.subscribe()
+        q2 = bridge.subscribe()
+
+        bus.emit(DISCUSSION_START, name="test")
+        await asyncio.sleep(0.05)
+
+        p1 = q1.get_nowait()
+        p2 = q2.get_nowait()
+        assert p1["type"] == DISCUSSION_START
+        assert p2["type"] == DISCUSSION_START
+        assert p1["data"]["name"] == "test"
+        assert p2["data"]["name"] == "test"
+
+        bridge.stop()
+
+    @pytest.mark.asyncio
+    async def test_unsubscribe_stops_delivery(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        q = bridge.subscribe()
+        bridge.unsubscribe(q)
+
+        bus.emit(AGENT_MESSAGE, role_id="x", name="X", content="Y")
+        await asyncio.sleep(0.05)
+
+        assert q.empty()
+
+        bridge.stop()
+
+
+class TestAsyncEventBridgeThreadedForwarding:
+    """Events from a worker thread reach async consumers."""
+
+    @pytest.mark.asyncio
+    async def test_forward_from_thread(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        q = bridge.subscribe()
+
+        # Run engine in a thread (simplified)
+        def sync_work() -> None:
+            bus.emit(DISCUSSION_START, name="threaded")
+            bus.emit(AGENT_MESSAGE, role_id="bot", name="Bot", content="Hi")
+            bus.emit(DISCUSSION_END, total_messages=1)
+
+        await asyncio.to_thread(sync_work)
+        await asyncio.sleep(0.1)
+
+        events = []
+        while not q.empty():
+            events.append(q.get_nowait())
+
+        types = [e["type"] for e in events]
+        assert "discussion_start" in types
+        assert "agent_message" in types
+        assert "discussion_end" in types
+
+        bridge.stop()
+
+
+class TestAsyncEventBridgePayloadFormat:
+    """Serialized events contain type, data, and ISO timestamp."""
+
+    @pytest.mark.asyncio
+    async def test_payload_structure(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        q = bridge.subscribe()
+        bus.emit(TOOL_CALL, role_id="analyst", tool_name="search", arguments='{"q":"test"}')
+        await asyncio.sleep(0.05)
+
+        payload = q.get_nowait()
+        assert "type" in payload
+        assert "data" in payload
+        assert "timestamp" in payload
+        # timestamp is ISO format string
+        assert isinstance(payload["timestamp"], str)
+        assert payload["data"]["tool_name"] == "search"
+
+        bridge.stop()
+
+
+class TestAsyncEventBridgeDropPolicy:
+    """When a queue is full, events are dropped without crashing."""
+
+    @pytest.mark.asyncio
+    async def test_full_queue_drops_events(self) -> None:
+        bus = EventEmitter()
+        bridge = AsyncEventBridge(bus)
+        loop = asyncio.get_event_loop()
+        bridge.start(loop)
+
+        # maxsize=2 to make it fill quickly
+        q: asyncio.Queue[dict] = asyncio.Queue(maxsize=2)
+        with bridge._lock:
+            bridge._queues.append(q)
+
+        # Emit 5 events — queue can hold 2
+        for i in range(5):
+            bus.emit(AGENT_MESSAGE, role_id="x", name="X", content=f"msg{i}")
+        await asyncio.sleep(0.1)
+
+        # Queue should have at most 2 items (rest dropped)
+        received = []
+        while not q.empty():
+            received.append(q.get_nowait())
+
+        assert len(received) <= 2
+
+        bridge.stop()
\ No newline at end of file
diff --git a/tests/test_server.py b/tests/test_server.py
new file mode 100644
index 0000000..83b5f0e
--- /dev/null
+++ b/tests/test_server.py
@@ -0,0 +1,163 @@
+"""Tests for meeting_room.server — FastAPI app, REST API, WebSocket/SSE."""
+
+from __future__ import annotations
+
+import asyncio
+
+import pytest
+from fastapi.testclient import TestClient
+
+from meeting_room.events import AsyncEventBridge, EventEmitter
+from meeting_room.server import Session, SessionStore, app, store
+
+
+@pytest.fixture(autouse=True)
+def _reset_store():
+    """Clear the global session store before each test."""
+    store._sessions.clear()
+    yield
+
+
+@pytest.fixture
+def client():
+    """FastAPI test client."""
+    return TestClient(app)
+
+
+# ---------------------------------------------------------------------------
+# SessionStore
+# ---------------------------------------------------------------------------
+
+
+class TestSessionStore:
+    def test_create_session(self) -> None:
+        store = SessionStore()
+        session = store.create({"providers": {}, "roles": {}, "defaults": {}}, _minimal_discussion_config())
+        assert session.id
+        assert session.status == "created"
+
+    def test_get_session(self) -> None:
+        store = SessionStore()
+        session = store.create({"providers": {}, "roles": {}, "defaults": {}}, _minimal_discussion_config())
+        found = store.get(session.id)
+        assert found is session
+
+    def test_get_nonexistent_session(self) -> None:
+        store = SessionStore()
+        assert store.get("nonexistent") is None
+
+    def test_list_sessions(self) -> None:
+        store = SessionStore()
+        store.create({"providers": {}, "roles": {}, "defaults": {}}, _minimal_discussion_config())
+        store.create({"providers": {}, "roles": {}, "defaults": {}}, _minimal_discussion_config())
+        assert len(store.list_sessions()) == 2
+
+
+# ---------------------------------------------------------------------------
+# REST API endpoints
+# ---------------------------------------------------------------------------
+
+
+class TestCreateSession:
+    def test_create_session_returns_id_and_status(self, client) -> None:
+        response = client.post("/api/sessions")
+        assert response.status_code == 200
+        data = response.json()
+        assert "id" in data
+        assert data["status"] == "created"
+
+
+class TestListSessions:
+    def test_list_empty(self, client) -> None:
+        response = client.get("/api/sessions")
+        assert response.status_code == 200
+        assert response.json() == []
+
+    def test_list_after_create(self, client) -> None:
+        client.post("/api/sessions")
+        client.post("/api/sessions")
+        response = client.get("/api/sessions")
+        assert response.status_code == 200
+        assert len(response.json()) == 2
+
+
+class TestGetSession:
+    def test_get_existing_session(self, client) -> None:
+        create_resp = client.post("/api/sessions")
+        session_id = create_resp.json()["id"]
+        response = client.get(f"/api/sessions/{session_id}")
+        assert response.status_code == 200
+        assert response.json()["id"] == session_id
+
+    def test_get_nonexistent_session(self, client) -> None:
+        response = client.get("/api/sessions/nonexistent")
+        assert response.status_code == 404
+
+
+class TestRolesAndProviders:
+    def test_list_roles(self, client) -> None:
+        response = client.get("/api/roles")
+        assert response.status_code == 200
+        data = response.json()
+        assert "moderator" in data or isinstance(data, dict)
+
+    def test_list_providers(self, client) -> None:
+        response = client.get("/api/providers")
+        assert response.status_code == 200
+        data = response.json()
+        assert isinstance(data, dict)
+
+
+# ---------------------------------------------------------------------------
+# Session model
+# ---------------------------------------------------------------------------
+
+
+class TestSession:
+    def test_build_engine(self) -> None:
+        config = _minimal_config()
+        session = Session("test-id", config, _minimal_discussion_config())
+        engine = session.build_engine()
+        assert engine is not None
+
+
+# ---------------------------------------------------------------------------
+# Helper
+# ---------------------------------------------------------------------------
+
+
+def _minimal_config() -> dict:
+    return {
+        "providers": {
+            "test_provider": {
+                "base_url": "https://api.example.com/v1",
+                "api_key": "test-key",
+            }
+        },
+        "roles": {
+            "moderator": {
+                "name": "Moderator",
+                "provider": "test_provider",
+                "model": "gpt-4o-mini",
+                "temperature": 0.7,
+                "tools": "none",
+                "system_prompt": "You are a moderator.",
+            }
+        },
+        "defaults": {
+            "max_rounds": 3,
+            "language": "en",
+            "framework": "custom",
+            "workdir": ".",
+        },
+    }
+
+
+def _minimal_discussion_config():
+    from meeting_room.models import DefaultsConfig, DiscussionConfig
+
+    return DiscussionConfig(
+        providers={"test_provider": {"base_url": "https://api.example.com/v1", "api_key": "test-key"}},
+        roles={"moderator": {"name": "Moderator", "provider": "test_provider", "model": "gpt-4o-mini"}},
+        defaults=DefaultsConfig(max_rounds=3),
+    )
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