@modelcontextprotocol/fastify

Modelcontextprotocol Fastify by Model Context Protocol

Fastify adapters for the Model Context Protocol TypeScript server SDK - Fastify middleware

Live Registry Versionv2.0.1Previous: v2.0.0Published 2026-10-02

Stability Grade

B+ (86/100)

90-Day Velocity

2 releases

Stable release cadence

Dependencies

0 direct

NPM manifest

License

Apache-2.0

Verified on NPM

Recommended Exact Pin: npx -y @modelcontextprotocol/fastify@2.0.1

NPM Registry ->GitHub Repo ->

TL;DR Verdict & Quick Citation Summary (2026-10-24)Source: AgentBreakWatch Live NPM Index

Modelcontextprotocol Fastify (@modelcontextprotocol/fastify) is currently at v2.0.1 on NPM (published 2026-10-02), with a 90-day stability score of 86/100 (B+) and MEDIUM schema drift risk across 2 releases in the past 90 days. recent release v2.0.1 (up from v2.0.0) updates MCP Bridge & Transport tool schemas and transport handling (2 releases in last 90d). Pin exact version v2.0.1 in .mcp.json to avoid silent parameter drift. Production teams should pin npx -y @modelcontextprotocol/fastify@2.0.1 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

recent release v2.0.1 (up from v2.0.0) updates MCP Bridge & Transport tool schemas and transport handling (2 releases in last 90d). Pin exact version v2.0.1 in .mcp.json to avoid silent parameter drift.

Watched Exports / MCP Tool Signatures:

tools/listtools/callfastify

Before (Deprecated / Unpinned Pattern)

"modelcontextprotocol-fastify": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/fastify@latest"]
}

After (Verified v2.0.1 Pattern)

"modelcontextprotocol-fastify": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/fastify@2.0.1"]
}

Frequently Asked Questions: @modelcontextprotocol/fastify

What is the latest version of @modelcontextprotocol/fastify on NPM?

As of 2026-10-24, the latest stable version of @modelcontextprotocol/fastify (Modelcontextprotocol Fastify by Model Context Protocol) on NPM is v2.0.1, published on 2026-10-02. It has shipped 2 releases in the last 90 days.

Does @modelcontextprotocol/fastify v2.0.1 have breaking changes or MCP schema drift risk?

@modelcontextprotocol/fastify currently carries a MEDIUM schema drift risk rating with a Stability Score of 86/100 (Grade B+). recent release v2.0.1 (up from v2.0.0) updates MCP Bridge & Transport tool schemas and transport handling (2 releases in last 90d). Pin exact version v2.0.1 in .mcp.json to avoid silent parameter drift.

How do I safely pin @modelcontextprotocol/fastify in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y @modelcontextprotocol/fastify@2.0.1` and monitor tools/list, tools/call, fastify for parameter or schema changes.

30-Min Registry & Schema Poller

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