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yvgude--lean-ctx/rust/eval/accuracy/longqa/determinism.md
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Output determinism

A lean-ctx tool output is a deterministic function of file content, read mode, CRP mode and the active task. Two runs on the same inputs produce byte-identical text, which is what makes the result safe to cache and cheap to re-bill.

To hold that contract the runtime keeps no timestamps or counters in output bodies; artifact filenames are content-addressed via a BLAKE3 hash of the command that produced them. Dedicated regression tests fail the build if any tool starts leaking a non-deterministic byte into its body.