# Observability MCP Server - Implementation Progress
## Current Status
**Phase:** 4 - Server Assembly ✓ COMPLETE
**Last Completed:** FINAL CHECKPOINT (ALL TESTS PASSING - 127/127)
**Status:** ✓ PROJECT COMPLETE AND READY FOR DELIVERY
**Blocked:** none
---
## Checklist
### Phase 1: Foundation ✓ COMPLETE
**Unit 1a: Project scaffold + models**
- [x] `pyproject.toml` — dependencies, project metadata
- [x] `src/overwatch_mcp/__init__.py` — package init (NOTE: using overwatch_mcp not observability_mcp_server)
- [x] `src/overwatch_mcp/models/__init__.py`
- [x] `src/overwatch_mcp/models/errors.py` — error types
- [x] `src/overwatch_mcp/models/config.py` — config models
- [x] `src/overwatch_mcp/models/responses.py` — response schemas
- [x] `tests/__init__.py`, `tests/unit/__init__.py`
- [x] `tests/conftest.py` — shared fixtures
- [x] `tests/unit/test_config.py` ✓ PASS
**Unit 1b: Config loader + cache**
- [x] `src/overwatch_mcp/config.py` — YAML loader
- [x] `src/overwatch_mcp/cache.py` — TTL cache
- [x] `tests/unit/test_cache.py` ✓ PASS
**CHECKPOINT:** `pytest tests/unit/ -v`
- [x] **✓ CHECKPOINT PASSED** (37/37 tests passed in 1.44s)
- [ ] **→ NEW CHAT** after checkpoint passes
---
### Phase 2: HTTP Clients ✓ COMPLETE
**Unit 2a: Base client + Graylog**
- [x] `src/overwatch_mcp/clients/__init__.py`
- [x] `src/overwatch_mcp/clients/base.py` — base HTTP client with retry & timeout
- [x] `src/overwatch_mcp/clients/graylog.py` — Graylog client
- [x] `tests/unit/test_graylog_client.py` ✓ PASS (16 tests)
**Unit 2b: Prometheus client**
- [x] `src/overwatch_mcp/clients/prometheus.py` — Prometheus client
- [x] `tests/unit/test_prometheus_client.py` ✓ PASS (20 tests)
**Unit 2c: InfluxDB client**
- [x] `src/overwatch_mcp/clients/influxdb.py` — InfluxDB client with CSV parsing
- [x] `tests/unit/test_influxdb_client.py` ✓ PASS (15 tests)
**CHECKPOINT:** `pytest tests/unit/ -v`
- [x] **✓ CHECKPOINT PASSED** (89/89 tests passed in 44.26s)
- [ ] **→ NEW CHAT** after checkpoint passes
---
### Phase 3: MCP Tools
**Unit 3a: Graylog tools** ✓ COMPLETE
- [x] `src/overwatch_mcp/tools/__init__.py`
- [x] `src/overwatch_mcp/tools/graylog.py` — graylog_search, graylog_fields
- [x] `tests/integration/__init__.py`
- [x] `tests/integration/test_graylog_tool.py` ✓ PASS (13 tests)
**Unit 3b: Prometheus tools** ✓ COMPLETE
- [x] `src/overwatch_mcp/tools/prometheus.py` — prometheus_query, prometheus_query_range, prometheus_metrics
- [x] `tests/integration/test_prometheus_tool.py` ✓ PASS (17 tests)
**Unit 3c: InfluxDB tools** ✓ COMPLETE
- [x] `src/overwatch_mcp/tools/influxdb.py` — influxdb_query
- [x] `tests/integration/test_influxdb_tool.py` ✓ PASS (8 tests)
**CHECKPOINT:** `pytest tests/ -v`
- [x] **✓ CHECKPOINT PASSED** (127/127 tests passed in 50.09s)
- [ ] **→ NEW CHAT** after checkpoint passes
---
### Phase 4: Server Assembly ✓ COMPLETE
**Unit 4a: Server + entry point** ✓ COMPLETE
- [x] `src/overwatch_mcp/server.py` — MCP server with tool registration, health checks
- [x] `src/overwatch_mcp/__main__.py` — entry point with CLI argument parsing
- [x] `config/config.example.yaml` — example configuration with all settings
- [x] `.env.example` — environment variable template
- [x] `README.md` — comprehensive setup and usage documentation
**FINAL:** `pytest tests/ -v && python -m overwatch_mcp --help`
- [x] **✓ FINAL PASSED** (127/127 tests passed in 53.58s, --help works correctly)
- [x] **✓ PROJECT COMPLETE** - Ready for delivery
---
## Decisions & Notes
| Date | Decision/Note |
|------|---------------|
| 2026-01-27 | Initial spec complete. 6 tools: graylog_search, graylog_fields, prometheus_query, prometheus_query_range, prometheus_metrics, influxdb_query |
| 2026-01-27 | Package name changed from `observability_mcp_server` to `overwatch_mcp` to match folder name (user preference) |
| 2026-01-27 | User has real Graylog/Prometheus/InfluxDB instances - will implement integration testing support |
---
## Session Log
| Date | Phase | Work Done | Result | Notes |
|------|-------|-----------|--------|-------|
| 2026-01-27 | Phase 1 | Created project scaffold, models (errors, config, responses), config loader, cache, and unit tests | ✓ PASS (37/37) | Foundation complete |
| 2026-01-27 | Phase 2 | Created base HTTP client, Graylog/Prometheus/InfluxDB clients with full test coverage | ✓ PASS (89/89) | All clients working with retry, timeout, CSV parsing |
| 2026-01-27 | Phase 3 Unit 3a | Created Graylog MCP tools (graylog_search, graylog_fields) with integration tests | ✓ PASS (102/102) | Implements time range validation, pattern filtering, caching |
| 2026-01-27 | Phase 3 Unit 3b | Created Prometheus MCP tools (prometheus_query, prometheus_query_range, prometheus_metrics) with integration tests | ✓ PASS (119/119) | Implements time range validation, auto-step calculation, caching for completed ranges |
| 2026-01-27 | Phase 3 Unit 3c | Created InfluxDB MCP tools (influxdb_query) with integration tests | ✓ PASS (127/127) | Implements bucket validation, CSV parsing, query execution |
| 2026-01-27 | Phase 3 CHECKPOINT | All MCP tools complete with 38 integration tests (13 Graylog + 17 Prometheus + 8 InfluxDB) | ✓ PASS (127/127) | All 6 tools working: graylog_search, graylog_fields, prometheus_query, prometheus_query_range, prometheus_metrics, influxdb_query |
| 2026-01-27 | Phase 4 | Created MCP server with stdio transport, tool registration, health checks, CLI entry point, configuration files, and comprehensive documentation | ✓ PASS (127/127) | Server assembly complete with degraded mode support |
| 2026-01-27 | FINAL CHECKPOINT | Complete implementation tested end-to-end | ✓ PASS (127/127) | All 4 phases complete. Project ready for delivery. |
---
## Error Recovery Log
Track failed approaches to prevent retry loops:
| Date | What Failed | Why | Next Approach |
|------|-------------|-----|---------------|
| | | | |
**Protocol:**
- Attempt 1: Diagnose, targeted fix
- Attempt 2: Different approach (same error = wrong strategy)
- Attempt 3: Question assumptions, check docs
- Attempt 4+: **STOP** — escalate to user with this log
---
## Context Management
### New Chat Startup Protocol
Before writing any code in a new chat, verify you can answer these from PROGRESS.md + spec:
| Question | Answer Source |
|----------|---------------|
| Where am I? | Current Status → Phase |
| Where am I going? | Checklist → remaining items |
| What's the goal? | spec.md → Intent |
| What have I tried? | Session Log |
| What failed? | Error Recovery Log |
**If you can't answer all 5 → re-read spec.md and PROGRESS.md before proceeding.**
### New Chat Policy
**Start a fresh chat after each CHECKPOINT passes.**
Why: Context compression and drift after 30+ tool calls degrades output quality. Checkpoints are natural isolation boundaries where state is fully externalized.
| Trigger | Action |
|---------|--------|
| CHECKPOINT passes | Commit, update PROGRESS.md, **start new chat** |
| FINAL passes | Deliver to user |
| Context feels stale | Update PROGRESS.md, start new chat |
---
## Markers Reference
| Marker | Meaning |
|--------|---------|
| `[ ]` | Not started |
| `[x]` | Implemented |
| `✓ PASS` | Tests passing |
| `✗ FAIL` | Tests failing (add note) |
| `⚠ SKIP` | Skipped (add reason) |
---
## Environment Notes
- **OS:** Windows
- **Python version:** 3.13.9 (meets >=3.11 requirement)
- **Container runtime:** none
- **Test command prefix:** `python -m pytest`
- **Known limitations:** None identified yet
---
## Discovery Notes Location
Sample API responses should be captured in `Docs/samples/`:
- `graylog_search.json`
- `graylog_fields.json`
- `prometheus_instant.json`
- `prometheus_range.json`
- `prometheus_metrics.json`
- `influxdb_flux.csv`
Document any surprises in `Docs/discovery-notes.md`.
