@modelcontextprotocol/server-everything
Anthropic's official 'everything' MCP server — a comprehensive test server that implements every MCP feature (tools, prompts, resources, sampling) for testing MCP clients and agent integrations.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
For testing only — local stdio transport. No network exposure, no real data.
⚡ Reliability
Best When
You're building an MCP client, agent framework, or testing harness and need a comprehensive reference implementation to test against. The canonical correctness check.
Avoid When
You need actual functionality — this server only returns test/synthetic data.
Use Cases
- • Testing that an MCP client correctly handles all protocol features
- • Debugging agent frameworks to verify tool call, prompt, and resource handling
- • Learning the MCP protocol by seeing all features in one server
- • Integration testing before connecting to production MCP servers
- • Benchmarking MCP client performance under various tool/resource loads
Not For
- • Production use — this is a test/reference server only
- • Real data operations — all responses are synthetic test data
- • End users (developer/framework authors only)
Interface
Authentication
No authentication required. Local stdio transport only.
Pricing
MIT licensed, free. Requires Node.js runtime.
Agent Metadata
Known Gotchas
- ⚠ All data is synthetic — do not use for real operations
- ⚠ Server deliberately exercises edge cases — behavior may be surprising to agents not designed for them
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for @modelcontextprotocol/server-everything.
Scores are editorial opinions as of 2026-03-06.