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feat(app): show session prompt cache hit rate in context stats - #50154
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Automated PR Cleanup Thank you for contributing to opencode. Due to the high volume of PRs from users and AI agents, we periodically close older PRs using automated criteria so maintainers can focus review time on the most active and community-supported contributions. This PR was closed because it matched the following cleanup criteria:
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Issue for this PR
Part of #42295 — the session context panel shows raw cache read/write tokens, but nothing that tells you how well prompt caching is actually working.
Type of change
What does this PR do?
Adds a "Cache Hit Rate (session)" row to the session context stats (desktop/web context panel). It is computed across every assistant message in the session as
cache.read / (cache.read + input)rounded to a percent, and renders "—" when the session has no input-side tokens yet. The math lives in a small pure helper next to the existing session-context formatter so it can be unit tested; the panel just renders it through the existing percent formatter. Other locales fall back to English until translated.How did you verify your code works?
bun test src/session/files/session-context-format.test.tsin packages/app: 5 pass (empty session, full hit, zero hit, rounding, negative totals); the wholesrc/session/filessuite (46 tests) passes.bun run typecheck(tsgo -b) in packages/app is clean.Screenshots / recordings
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