@primer/mcp

Primer MCP by Primer

An MCP server that connects AI tools to the Primer Design System

Live Registry Versionv1.1.2Previous: v1.1.1Published 2026-10-23

Stability Grade

B+ (82/100)

90-Day Velocity

13 releases

Moderate cadence

Dependencies

8 direct

NPM manifest

License

MIT

Verified on NPM

Recommended Exact Pin: npx -y @primer/mcp@1.1.2

NPM Registry ->GitHub Repo ->

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

Primer MCP (@primer/mcp) is currently at v1.1.2 on NPM (published 2026-10-23), with a 90-day stability score of 82/100 (B+) and MEDIUM schema drift risk across 13 releases in the past 90 days. recent release v1.1.2 (up from v1.1.1) updates Design & UI MCP tool schemas and transport handling (13 releases in last 90d). Pin exact version v1.1.2 in .mcp.json to avoid silent parameter drift. Production teams should pin npx -y @primer/mcp@1.1.2 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

recent release v1.1.2 (up from v1.1.1) updates Design & UI MCP tool schemas and transport handling (13 releases in last 90d). Pin exact version v1.1.2 in .mcp.json to avoid silent parameter drift.

Watched Exports / MCP Tool Signatures:

mcptools/listtools/call

Before (Deprecated / Unpinned Pattern)

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

After (Verified v1.1.2 Pattern)

"primer-mcp": {
  "command": "npx",
  "args": ["-y", "@primer/mcp@1.1.2"]
}

Frequently Asked Questions: @primer/mcp

What is the latest version of @primer/mcp on NPM?

As of 2026-10-24, the latest stable version of @primer/mcp (Primer MCP by Primer) on NPM is v1.1.2, published on 2026-10-23. It has shipped 13 releases in the last 90 days.

Does @primer/mcp v1.1.2 have breaking changes or MCP schema drift risk?

@primer/mcp currently carries a MEDIUM schema drift risk rating with a Stability Score of 82/100 (Grade B+). recent release v1.1.2 (up from v1.1.1) updates Design & UI MCP tool schemas and transport handling (13 releases in last 90d). Pin exact version v1.1.2 in .mcp.json to avoid silent parameter drift.

How do I safely pin @primer/mcp in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y @primer/mcp@1.1.2` and monitor mcp, tools/list, tools/call for parameter or schema changes.

30-Min Registry & Schema Poller