# Primer MCP (@primer/mcp) - AgentBreakWatch Reference

> TL;DR Verdict: 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 last 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.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/primer-mcp
- Category Hub: https://agentbreakwatch.vercel.app/c/design-ui (Design, Figma, Storybook & UI Component MCP Servers)
- Package Name: `@primer/mcp`
- Registry: NPM (https://www.npmjs.com/package/@primer/mcp)
- GitHub Repository: https://github.com/primer/react
- Vendor: Primer
- Latest Live Version: v1.1.2
- Published Date: 2026-10-23T15:50:14.824Z
- 90-Day Release Count: 13
- Direct Dependencies: 8
- License: MIT
- Stability Score: 82/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `npx -y @primer/mcp@1.1.2`
- Watched Symbols / MCP Tools: mcp, tools/list, tools/call
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
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.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
"primer-mcp": {
  "command": "npx",
  "args": ["-y", "@primer/mcp@latest"]
}
```

## Migration Diff: After (Verified v1.1.2 Pattern)
```
"primer-mcp": {
  "command": "npx",
  "args": ["-y", "@primer/mcp@1.1.2"]
}
```

## Recent Verified Releases
- v1.1.2 (published 2026-10-23) [LATEST]
- v1.1.1 (published 2026-10-16)
- v1.1.0 (published 2026-09-03)
- v0.0.0-20260831205533 (published 2026-08-31)
- v0.0.0-20260814130501 (published 2026-08-14)
- v0.0.0-20260805190128 (published 2026-08-05)