# MCP Everything Conformance Server (@modelcontextprotocol/server-everything) - AgentBreakWatch Reference

> TL;DR Verdict: MCP Everything Conformance Server (`@modelcontextprotocol/server-everything`) is currently at v2.0.0 on NPM (published 2026-10-19), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 4 releases in the last 90 days. Major v2.0.0 release aligns test tools, prompts, and resources with MCP 2025-11-25 / 2026 spec features including elicitation and audio blocks.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/mcp-server-everything
- Category Hub: https://agentbreakwatch.vercel.app/c/official-reference (Official Reference MCP Servers Stability & Migration Index)
- Package Name: `@modelcontextprotocol/server-everything`
- Registry: NPM (https://www.npmjs.com/package/@modelcontextprotocol/server-everything)
- GitHub Repository: https://github.com/modelcontextprotocol/servers
- Vendor: Model Context Protocol
- Latest Live Version: v2.0.0
- Published Date: 2026-10-19T06:50:03.188Z
- 90-Day Release Count: 4
- Direct Dependencies: 7
- License: SEE LICENSE IN LICENSE
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `npx -y @modelcontextprotocol/server-everything@2.0.0`
- Watched Symbols / MCP Tools: echo, annotatedMessage, getResourceReference, startElicitation
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Major v2.0.0 release aligns test tools, prompts, and resources with MCP 2025-11-25 / 2026 spec features including elicitation and audio blocks.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
npx -y @modelcontextprotocol/server-everything sse
```

## Migration Diff: After (Verified v2.0.0 Pattern)
```
npx -y @modelcontextprotocol/server-everything streamableHttp
```

## Recent Verified Releases
- v2.0.0 (published 2026-10-19) [LATEST]
- v1.0.0 (published 2026-10-11)
- v2026.8.31 (published 2026-08-31)
- v2026.8.18 (published 2026-08-18)
- v2026.7.4 (published 2026-07-04)
- v2026.1.26 (published 2026-01-27)