Jason Woltje
d51b1bd749
Implement context compaction to free memory when agents reach 80% context usage. Features: - ContextCompactor class for handling compaction operations - Generates summary prompt asking agent to summarize completed work - Replaces conversation history with concise summary - Measures context reduction before/after compaction - Logs compaction metrics (tokens freed, reduction percentage) - Integration with ContextMonitor via trigger_compaction() method Implementation details: - CompactionResult dataclass tracks before/after metrics - Target: 40-50% context reduction when triggered at 80% - Error handling for API failures - Type-safe with mypy strict mode - 100% test coverage for new code Quality gates passed: ✅ Build (mypy): No type errors ✅ Lint (ruff): All checks passed ✅ Tests: 41/41 tests passing ✅ Coverage: 100% for context_compaction.py, 97% for context_monitor.py Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Mosaic Coordinator
FastAPI webhook receiver for Gitea issue events, enabling autonomous task coordination for AI agents.
Overview
The coordinator receives webhook events from Gitea when issues are assigned, unassigned, or closed. It verifies webhook authenticity via HMAC SHA256 signature and routes events to appropriate handlers.
Features
- HMAC SHA256 signature verification
- Event routing (assigned, unassigned, closed)
- AI-powered issue metadata parsing (using Anthropic Sonnet)
- Context estimation and agent assignment
- Dependency tracking (blocks/blocked_by)
- Comprehensive logging
- Health check endpoint
- Docker containerized
- 95%+ test coverage
Development
Prerequisites
- Python 3.11+
- pip or uv package manager
Setup
# Install dependencies
pip install -e ".[dev]"
# Run tests
pytest
# Run with coverage
pytest --cov=src --cov-report=html
# Type checking
mypy src/
# Linting
ruff check src/
Running locally
# Copy environment template
cp .env.example .env
# Edit .env with your values
# GITEA_WEBHOOK_SECRET, GITEA_URL, ANTHROPIC_API_KEY
# Run server
uvicorn src.main:app --reload --port 8000
API Endpoints
POST /webhook/gitea
Receives Gitea webhook events.
Headers:
X-Gitea-Signature: HMAC SHA256 signature of request body
Response:
200 OK: Event processed successfully401 Unauthorized: Invalid or missing signature422 Unprocessable Entity: Invalid payload
GET /health
Health check endpoint.
Response:
200 OK: Service is healthy
Environment Variables
| Variable | Description | Required | Default |
|---|---|---|---|
GITEA_WEBHOOK_SECRET |
Secret for HMAC signature verification | Yes | - |
GITEA_URL |
Gitea instance URL | Yes | - |
ANTHROPIC_API_KEY |
Anthropic API key for issue parsing | Yes | - |
LOG_LEVEL |
Logging level (debug, info, warning, error) | No | info |
HOST |
Server host | No | 0.0.0.0 |
PORT |
Server port | No | 8000 |
Docker
# Build
docker build -t mosaic-coordinator .
# Run
docker run -p 8000:8000 \
-e GITEA_WEBHOOK_SECRET="your-secret" \
-e GITEA_URL="https://git.mosaicstack.dev" \
-e ANTHROPIC_API_KEY="your-anthropic-key" \
mosaic-coordinator
Testing
# Run all tests
pytest
# Run with coverage (requires 85%+)
pytest --cov=src --cov-report=term-missing
# Run specific test file
pytest tests/test_security.py
# Run with verbose output
pytest -v
Architecture
apps/coordinator/
├── src/
│ ├── main.py # FastAPI application
│ ├── webhook.py # Webhook endpoint handlers
│ ├── parser.py # Issue metadata parser (Anthropic)
│ ├── models.py # Data models
│ ├── security.py # HMAC signature verification
│ ├── config.py # Configuration management
│ └── context_monitor.py # Context usage monitoring
├── tests/
│ ├── test_security.py
│ ├── test_webhook.py
│ ├── test_parser.py
│ ├── test_context_monitor.py
│ └── conftest.py # Pytest fixtures
├── pyproject.toml # Project metadata & dependencies
├── .env.example # Environment variable template
├── Dockerfile
└── README.md
Related Issues
- #156 - Create coordinator bot user
- #157 - Set up webhook receiver endpoint
- #158 - Implement issue parser
- #140 - Coordinator architecture