I lint-scanned 36 popular MCP servers. A third of them are failing your agent. · Teng Li
- 2026-07-21AgentsMCPEngineering Your MCP server can be 100% spec-compliant and still be unusable by an agent.
- The Model Context Protocol spec tells you how to transport tools: JSON-RPC framing, capability negotiation, schema shapes.
- It says nothing about whether a model can actually use what you serve — whether it picks the right tool out of your catalog, fills the arguments correctly, or burns 8k tokens parsing your schemas on every single request.
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- 2026-07-21AgentsMCPEngineering Your MCP server can be 100% spec-compliant and still be unusable by an agent.
- The Model Context Protocol spec tells you how to transport tools: JSON-RPC framing, capability negotiation, schema shapes.
- It says nothing about whether a model can actually use what you serve — whether it picks the right tool out of your catalog, fills the arguments correctly, or burns 8k tokens parsing your schemas on every single request.
Sources: Tengli