Scope tool preview compile to referenced definitions

[RhysSullivan]

describe.tool compiled the TypeScript preview against every definition in the connection's spec, not the subgraph the tool references. The compiler scans the whole definitions map per node, so one describe of a large spec (PostHog: 4k schemas) cost 10+ s of CPU on the shared session Durable Object isolate. The vendored compiler also memoized on a module-level Map with strong keys, retaining ~17 MB per call for the isolate's lifetime. Together these reset the isolate mid-execute and dropped in-flight results for every co-resident session.

• Pass the already-computed referenced subgraph to the compiler. Output is identical; the referenced set was only used for a side field before.
• Memoize on a WeakMap so compiled graphs are collectable.
• Add a node-count guard before the synchronous compile; over the cap the preview degrades to unknown instead of pinning the isolate.

Bench on the real PostHog spec: persons.personsList 410 ms → 1 ms, all 2,142 tools average 2 ms, no retained heap after repeated compiles.

🤖 Generated with Claude Code

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