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pi-lens

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Real-time code feedback for pi — LSP, linters, formatters, type-checking, structural analysis & booboo

github.com/apmantza/pi-lens

apmantza/pi-lens

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# ADR 0006: benchmark before a derived-state cache ## Status Accepted — 2026-09-23 ## Context The staleness arc fixed caches whose invalidation keys could not express the truth. For signatures, line counts, hashes, and import graphs, a bounded request-local recompute can remove that invalidation surface. Tool-run caches are a separate class because the expensive operation is the tool run. ## Decision Do not add a cross-request derived-state cache until a fresh-process benchmark shows that request-local recomputation is the cost. A justified cache carries the generation from which it was derived. ## Consequences Cheap derived state has no stale cache to invalidate. Any future cache needs a benchmark with a control row, explicit freshness axes, and a measured reason that the request-local pass is insufficient. ## Links - Catalog shape: `AGENTS.md` shape 51. - Issue: #1644 closure decision, 2026-09-22. - PR: #3253.