@modelcontextprotocol/server-everything

MCP Everything Conformance Server by Model Context Protocol

MCP server that exercises all the features of the MCP protocol

Live Registry Versionv2.0.0Previous: v1.0.0Published 2026-10-19

Stability Grade

B+ (86/100)

90-Day Velocity

4 releases

Stable release cadence

Dependencies

7 direct

NPM manifest

License

SEE LICENSE IN LICENSE

Verified on NPM

Recommended Exact Pin: npx -y @modelcontextprotocol/server-everything@2.0.0

NPM Registry ->GitHub Repo ->

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

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 past 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. Production teams should pin npx -y @modelcontextprotocol/server-everything@2.0.0 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

Major v2.0.0 release aligns test tools, prompts, and resources with MCP 2025-11-25 / 2026 spec features including elicitation and audio blocks.

Watched Exports / MCP Tool Signatures:

echoannotatedMessagegetResourceReferencestartElicitation

Before (Deprecated / Unpinned Pattern)

npx -y @modelcontextprotocol/server-everything sse

After (Verified v2.0.0 Pattern)

npx -y @modelcontextprotocol/server-everything streamableHttp

Frequently Asked Questions: @modelcontextprotocol/server-everything

What is the latest version of @modelcontextprotocol/server-everything on NPM?

As of 2026-10-24, the latest stable version of @modelcontextprotocol/server-everything (MCP Everything Conformance Server by Model Context Protocol) on NPM is v2.0.0, published on 2026-10-19. It has shipped 4 releases in the last 90 days.

Does @modelcontextprotocol/server-everything v2.0.0 have breaking changes or MCP schema drift risk?

@modelcontextprotocol/server-everything currently carries a MEDIUM schema drift risk rating with a Stability Score of 86/100 (Grade B+). Major v2.0.0 release aligns test tools, prompts, and resources with MCP 2025-11-25 / 2026 spec features including elicitation and audio blocks.

How do I safely pin @modelcontextprotocol/server-everything in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y @modelcontextprotocol/server-everything@2.0.0` and monitor echo, annotatedMessage, getResourceReference, startElicitation for parameter or schema changes.

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