Official Reference MCP Servers Stability & Migration Index
Track breaking changes, v2.0.0 roots protocol updates, and archived-server replacements across official @modelcontextprotocol/server-* packages and Python reference MCP servers.
Several early @modelcontextprotocol/server-* packages (github, postgres, puppeteer, slack) are archived on npm and superseded by vendor-maintained MCP servers, while active servers (filesystem, memory, sequential-thinking) shipped major v2.0.0 schema updates. Across 17 tracked packages in Official Reference MCPs, the average 90-day stability score is 83/100 with 6 high-drift packages. Most recent release: @modelcontextprotocol/server-sequential-thinking v2.0.0 (2026-10-19).
Complete Official Reference MCPs Comparison & Version Pin Matrix
Click any package to view `tools/list` schema diffs, watched symbols, and before/after migration code.
| Package | Registry | Live Version | Published | 90d Releases | Drift Risk | Stability | Recommended Exact Pin |
|---|---|---|---|---|---|---|---|
| @modelcontextprotocol/server-filesystem MCP Filesystem Server | npm | v2.0.0 | 2026-10-19 | 3 | high | B (78) | npx -y @modelcontextprotocol/server-filesystem@2.0.0 |
| @modelcontextprotocol/server-memory MCP Knowledge Graph Memory Server | npm | v2.0.0 | 2026-10-19 | 3 | high | B (78) | npx -y @modelcontextprotocol/server-memory@2.0.0 |
| @modelcontextprotocol/server-sequential-thinking MCP Sequential Thinking Server | npm | v2.0.0 | 2026-10-19 | 3 | medium | B+ (86) | npx -y @modelcontextprotocol/server-sequential-thinking@2.0.0 |
| @modelcontextprotocol/server-everything MCP Everything Conformance Server | npm | v2.0.0 | 2026-10-19 | 4 | medium | B+ (86) | npx -y @modelcontextprotocol/server-everything@2.0.0 |
| @modelcontextprotocol/server-github MCP GitHub Server (Legacy NPM) | npm | v2025.4.8 | 2025-04-08 | 0 | high | B (78) | npx -y @modelcontextprotocol/server-github@2025.4.8 |
| @modelcontextprotocol/server-postgres MCP PostgreSQL Server | npm | v0.6.2 | 2024-12-04 | 0 | high | C+ (73) | npx -y @modelcontextprotocol/server-postgres@0.6.2 |
| @modelcontextprotocol/server-slack MCP Slack Server | npm | v2025.4.25 | 2025-04-25 | 0 | medium | B+ (86) | npx -y @modelcontextprotocol/server-slack@2025.4.25 |
| @modelcontextprotocol/server-brave-search MCP Brave Search Server | npm | v0.6.2 | 2024-12-04 | 0 | medium | B (81) | npx -y @modelcontextprotocol/server-brave-search@0.6.2 |
| @modelcontextprotocol/server-puppeteer MCP Puppeteer Server | npm | v2025.5.12 | 2025-05-12 | 0 | high | B (78) | npx -y @modelcontextprotocol/server-puppeteer@2025.5.12 |
| @modelcontextprotocol/server-gdrive MCP Google Drive Server | npm | v2025.1.14 | 2025-01-14 | 0 | medium | B+ (86) | npx -y @modelcontextprotocol/server-gdrive@2025.1.14 |
| @modelcontextprotocol/server-google-maps MCP Google Maps Server | npm | v0.6.2 | 2024-12-04 | 0 | low | B+ (87) | npx -y @modelcontextprotocol/server-google-maps@0.6.2 |
| @modelcontextprotocol/server-redis MCP Redis Server | npm | v2025.4.25 | 2025-04-25 | 0 | medium | B+ (86) | npx -y @modelcontextprotocol/server-redis@2025.4.25 |
| @modelcontextprotocol/server-aws-kb-retrieval MCP AWS KB Retrieval Server | npm | v0.6.2 | 2025-01-14 | 0 | medium | B (81) | npx -y @modelcontextprotocol/server-aws-kb-retrieval@0.6.2 |
| mcp-server-git MCP Git Server (Python) | pypi | v2026.10.19 | 2026-10-19 | 3 | high | B (78) | uvx mcp-server-git@2026.10.19 |
| mcp-server-fetch MCP Fetch Server (Python) | pypi | v2026.10.19 | 2026-10-19 | 3 | low | A (92) | uvx mcp-server-fetch@2026.10.19 |
| mcp-server-time MCP Time & Timezone Server (Python) | pypi | v2026.10.19 | 2026-10-19 | 3 | low | A (92) | uvx mcp-server-time@2026.10.19 |
| mcp-server-sqlite MCP SQLite Server (Python) | pypi | v2025.4.25 | 2025-04-25 | 0 | low | A (92) | uvx mcp-server-sqlite@2025.4.25 |
Frequently Asked Questions: Official Reference MCPs
Which Official Reference MCPs packages have the highest schema drift risk?
Among the 17 tracked Official Reference MCPs packages, 6 carry a HIGH schema drift risk rating, led by @modelcontextprotocol/server-filesystem (v2.0.0), @modelcontextprotocol/server-memory (v2.0.0), @modelcontextprotocol/server-github (v2025.4.8), @modelcontextprotocol/server-postgres (v0.6.2), @modelcontextprotocol/server-puppeteer (v2025.5.12). Always pin exact versions in production.
What is the fastest-moving package in Official Reference MCPs?
@modelcontextprotocol/server-everything (MCP Everything Conformance Server) has shipped 4 releases in the last 90 days, with latest version v2.0.0 published on 2026-10-19.
How should engineering teams pin Official Reference MCPs dependencies?
Several early @modelcontextprotocol/server-* packages (github, postgres, puppeteer, slack) are archived on npm and superseded by vendor-maintained MCP servers, while active servers (filesystem, memory, sequential-thinking) shipped major v2.0.0 schema updates.
Get Breaking-Change Alerts for Official Reference MCPs
Monitor all 17 Official Reference MCPs packages and receive instant migration snippets when tool schemas or exports shift.