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cache-assembler

Launching today

Cuts Claude Code and API costs 8.2x by fixing prompt-caching

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Cuts Claude Code and API costs 8.2x by fixing prompt-caching

1 follower

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cache-assembler fixes prompt-cache invalidation for Claude Code and the Anthropic API. The cache only hits on byte-identical requests, but real traffic breaks that: inconsistent tool-schema ordering, session data leaking into prompts, concurrent requests racing to write the same entry. This proxy fixes all three, with a dedicated Claude Code preset. Measured against the real API (not synthetic): 8.2x cost reduction, $1.33 to $0.16 per 100-turn session. MIT licensed, zero dependencies.

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Launch tags:Open Source•Developer Tools•Artificial Intelligence

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Hey PH! Built this after realizing my own agentic Claude setup was burning way more tokens than it needed to - turns out prompt caching only works if your request bytes match exactly, and most real usage never hits that bar without help. cache-assembler sits in front of the API and fixes what normally breaks the match. Measured it properly against the real Anthropic API (not a synthetic benchmark) - 8.2x cost reduction, $1.33 to $0.16 per session. MIT licensed, zero dependencies. Happy to answer anything about the mechanism or the validation methodology - would love feedback from anyone else running heavy agentic workloads.

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17h ago