fix(validators): cache compiled schemas to prevent memory leak (#2605) - #2608
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fix(validators): cache compiled schemas to prevent memory leak (#2605)#2608elang2 wants to merge 2 commits into
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… leak (#2605) Add content-keyed caches to AjvJsonSchemaValidator and CfWorkerJsonSchemaValidator so that schemas without $id are not recompiled on every getValidator() call. This prevents Ajv's internal scope from growing without bound in long-running MCP clients that periodically refresh their tool catalogue. The cache key is the JSON-serialised schema content. Schemas with $id continue to use Ajv's built-in identity cache. Non-serialisable schemas (cyclic, BigInt) fall back to uncached compilation.
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@modelcontextprotocol/client
@modelcontextprotocol/codemod
@modelcontextprotocol/core
@modelcontextprotocol/server
@modelcontextprotocol/server-legacy
@modelcontextprotocol/express
@modelcontextprotocol/fastify
@modelcontextprotocol/hono
@modelcontextprotocol/node
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Summary
Map<string, AjvValidateFunction>) toAjvSchemaValidatorProviderandCfWorkerSchemaValidatorProvider$idwere recompiled on everygetValidator()call, leaking Ajv instances over timeJSON.stringify(schema)withJSON.parse(key)for compilation (avoids stale identity-cache hits from mutated schemas)Test plan
validatorCaching.test.tscovering: cache hits, content changes,$idpreservation, mutation safety, error isolationFixes #2605