Versioning MCP Tool Schemas Without Breaking Agents (ANSWERED)
Tool schema drift breaks agents silently — models call old argument shapes and get 400s. Interviewers want a semver-minded process.
TL;DR — Quick Answer
Use explicit server and tool version fields, additive schema changes by default, deprecate with dual-registration periods, contract tests in CI, and coordinate host pinning so models never see conflicting tool definitions mid-session.
The Interview Question
Your team needs to evolve MCP tool JSON Schemas as APIs change. How do you version tools, maintain backward compatibility, and coordinate host/server rollouts?
Deep Explanation
Tool schema drift breaks agents silently — models call old argument shapes and get 400s. Interviewers want a semver-minded process.
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