# Claude Code CLI & MCP Server (@anthropic-ai/claude-code) - AgentBreakWatch Reference

> TL;DR Verdict: Claude Code CLI & MCP Server (`@anthropic-ai/claude-code`) is currently at v2.1.310 on NPM (published 2026-10-23), with a 90-day Stability Score of 70/100 (C+) and HIGH schema drift risk across 78 releases in the last 90 days. v2.1.x updates `claude mcp serve` tool schemas and `.mcp.json` project-scoped server approval rules.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/claude-code-cli
- Category Hub: https://agentbreakwatch.vercel.app/c/mcp-bridges-devtools (MCP Bridges, Transports, Inspectors & Developer Tools)
- Package Name: `@anthropic-ai/claude-code`
- Registry: NPM (https://www.npmjs.com/package/@anthropic-ai/claude-code)
- GitHub Repository: https://github.com/anthropics/claude-code
- Vendor: Anthropic
- Latest Live Version: v2.1.310
- Published Date: 2026-10-23T21:20:46.540Z
- 90-Day Release Count: 78
- Direct Dependencies: 0
- License: SEE LICENSE IN README.md
- Stability Score: 70/100 (Grade C+)
- Schema Drift Risk: HIGH
- Recommended Exact Pin Command: `npx -y @anthropic-ai/claude-code@2.1.310`
- Watched Symbols / MCP Tools: claude mcp add, claude mcp serve, Bash, Edit
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
v2.1.x updates `claude mcp serve` tool schemas and `.mcp.json` project-scoped server approval rules.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
claude mcp add my-server -e KEY=val -- npx server
```

## Migration Diff: After (Verified v2.1.310 Pattern)
```
claude mcp add --transport stdio my-server -e KEY=val -- npx server
```

## Recent Verified Releases
- v2.1.310 (published 2026-10-23) [LATEST]
- v2.1.309 (published 2026-10-22)
- v2.1.308 (published 2026-10-22)
- v2.1.307 (published 2026-10-21)
- v2.1.306 (published 2026-10-21)
- v2.1.305 (published 2026-10-20)