mcp-handler

MCP Handler by vercel-labs

Framework-agnostic HTTP adapter for Model Context Protocol servers

Live Registry Versionv2.3.0Previous: v2.2.0Published 2026-10-07

Stability Grade

B+ (86/100)

90-Day Velocity

8 releases

Moderate cadence

Dependencies

2 direct

NPM manifest

License

Apache-2.0

Verified on NPM

Recommended Exact Pin: npx -y mcp-handler@2.3.0

NPM Registry ->GitHub Repo ->

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

MCP Handler (mcp-handler) is currently at v2.3.0 on NPM (published 2026-10-07), with a 90-day stability score of 86/100 (B+) and MEDIUM schema drift risk across 8 releases in the past 90 days. recent release v2.3.0 (up from v2.2.0) updates MCP Bridge & Transport tool schemas and transport handling (8 releases in last 90d). Pin exact version v2.3.0 in .mcp.json to avoid silent parameter drift. Production teams should pin npx -y mcp-handler@2.3.0 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

recent release v2.3.0 (up from v2.2.0) updates MCP Bridge & Transport tool schemas and transport handling (8 releases in last 90d). Pin exact version v2.3.0 in .mcp.json to avoid silent parameter drift.

Watched Exports / MCP Tool Signatures:

mcp-adaptermcp-handlertools/listtools/call

Before (Deprecated / Unpinned Pattern)

"mcp-handler": {
  "command": "npx",
  "args": ["-y", "mcp-handler@latest"]
}

After (Verified v2.3.0 Pattern)

"mcp-handler": {
  "command": "npx",
  "args": ["-y", "mcp-handler@2.3.0"]
}

Frequently Asked Questions: mcp-handler

What is the latest version of mcp-handler on NPM?

As of 2026-10-24, the latest stable version of mcp-handler (MCP Handler by vercel-labs) on NPM is v2.3.0, published on 2026-10-07. It has shipped 8 releases in the last 90 days.

Does mcp-handler v2.3.0 have breaking changes or MCP schema drift risk?

mcp-handler currently carries a MEDIUM schema drift risk rating with a Stability Score of 86/100 (Grade B+). recent release v2.3.0 (up from v2.2.0) updates MCP Bridge & Transport tool schemas and transport handling (8 releases in last 90d). Pin exact version v2.3.0 in .mcp.json to avoid silent parameter drift.

How do I safely pin mcp-handler in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y mcp-handler@2.3.0` and monitor mcp-adapter, mcp-handler, tools/list, tools/call for parameter or schema changes.

30-Min Registry & Schema Poller