@modelcontextprotocol/core

Modelcontextprotocol Core by Model Context Protocol

Model Context Protocol for TypeScript - public Zod schemas (spec + OAuth/OpenID)

Live Registry Versionv2.4.0Previous: v2.3.1Published 2026-10-23

Stability Grade

B+ (86/100)

90-Day Velocity

6 releases

Moderate cadence

Dependencies

1 direct

NPM manifest

License

Apache-2.0

Verified on NPM

Recommended Exact Pin: npx -y @modelcontextprotocol/core@2.4.0

NPM Registry ->GitHub Repo ->

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

Modelcontextprotocol Core (@modelcontextprotocol/core) is currently at v2.4.0 on NPM (published 2026-10-23), with a 90-day stability score of 86/100 (B+) and MEDIUM schema drift risk across 6 releases in the past 90 days. recent release v2.4.0 (up from v2.3.1) updates Developer Tools MCP tool schemas and transport handling (6 releases in last 90d). Pin exact version v2.4.0 in .mcp.json to avoid silent parameter drift. Production teams should pin npx -y @modelcontextprotocol/core@2.4.0 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

recent release v2.4.0 (up from v2.3.1) updates Developer Tools MCP tool schemas and transport handling (6 releases in last 90d). Pin exact version v2.4.0 in .mcp.json to avoid silent parameter drift.

Watched Exports / MCP Tool Signatures:

tools/listtools/callcore

Before (Deprecated / Unpinned Pattern)

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

After (Verified v2.4.0 Pattern)

"modelcontextprotocol-core": {
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/core@2.4.0"]
}

Frequently Asked Questions: @modelcontextprotocol/core

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

As of 2026-10-24, the latest stable version of @modelcontextprotocol/core (Modelcontextprotocol Core by Model Context Protocol) on NPM is v2.4.0, published on 2026-10-23. It has shipped 6 releases in the last 90 days.

Does @modelcontextprotocol/core v2.4.0 have breaking changes or MCP schema drift risk?

@modelcontextprotocol/core currently carries a MEDIUM schema drift risk rating with a Stability Score of 86/100 (Grade B+). recent release v2.4.0 (up from v2.3.1) updates Developer Tools MCP tool schemas and transport handling (6 releases in last 90d). Pin exact version v2.4.0 in .mcp.json to avoid silent parameter drift.

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

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y @modelcontextprotocol/core@2.4.0` and monitor tools/list, tools/call, core for parameter or schema changes.

30-Min Registry & Schema Poller

Get Instant Breaking-Change Alerts for @modelcontextprotocol/core

We poll NPM and modelcontextprotocol/typescript-sdk every 30 minutes. Get an email with the exact diff when @modelcontextprotocol/core ships a breaking release beyond v2.4.0.