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Anandanandanandh8x
1c5c6e78a8
Compute a seven-field SHA-256 fingerprint of the cacheable prompt prefix (base instructions, confirmation policy, project context, skills, tools, tool schemas, complete) and emit one prefix_hash event per turn through the trace recorder. The complete hash is the SHA-256 of the canonical join of the other six, so any sub-component drift is observable both individually and in aggregate. The decomposition exists so a downstream observer can detect which sub-component of the prefix broke cache stability across turns: a stable complete_prefix hash means the cacheable prefix is byte- identical, and the sub-hash that changed names the culprit. No behavior change for untraced runs. For OpenAI, the existing prompt_cache_key (session ID) is unchanged; the fingerprint is purely additive observability. The Anthropic cache_control breakpoint work already in main is not touched. Co-authored-by: anandh8x <[email protected]>