fix(cache): auto-generate .deepseek/instructions.md to stabilize KV prefix cache#1080
Merged
Hmbown merged 1 commit intoHmbown:mainfrom May 7, 2026
Merged
fix(cache): auto-generate .deepseek/instructions.md to stabilize KV prefix cache#1080Hmbown merged 1 commit intoHmbown:mainfrom
Hmbown merged 1 commit intoHmbown:mainfrom
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…refix cache When no context file (AGENTS.md, CLAUDE.md, etc.) exists in the workspace, the previous fallback called summarize_project() and project_tree() on every turn via refresh_system_prompt(). These functions scan the filesystem in real-time, so any file change during a session alters the system prompt bytes and invalidates the entire KV prefix cache from that layer onward. Now load_project_context_with_parents() auto-generates .deepseek/instructions.md once when no context file is found. Subsequent turns load the file from disk — bytes are stable for the entire session. Users can edit or delete the file at any time.
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Summary
When a workspace has no context file (
AGENTS.md,CLAUDE.md,.deepseek/instructions.md, etc.), the system prompt assembly falls back to callingsummarize_project()+project_tree()on every turn viarefresh_system_prompt(). Both functions useWalkBuilderto scan the filesystem in real-time. Any file change during a session alters the system prompt bytes, invalidating the entire KV prefix cache — effectively zero cache hits for workspaces without context files.Fix:
load_project_context_with_parents()now auto-generates.deepseek/instructions.mdonce when no context file is found. Subsequent turns load the file from disk, keeping system prompt bytes stable for the entire session. The generated file is marked as auto-generated; users can freely edit or delete it.Closes #979
Testing
cargo test --all-featurescargo fmt --all -- --checkcargo clippy --all-targets --all-featuresChecklist