context-doctor

# context-doctor — Token Efficiency Diagnosis + Automatic Prescription Diagnoses the main causes of session token waste and prescribes immediate remedies: 1. No `.claudeignore` → unnecessary files loaded wholesale into context 2. Repeated full reads of large files → paying the same cost N times 3. Not using `/clear` after direction changes → continuing work with accumulated noise 4. Verbose CLI output → every `git`/`ls`/build/test call floods context with stdout (a *different* layer from 1–3 — see §Command-Output Reduction) **Two reduction axes — keep them distinct.** Causes 1–3 are the **context-footprint** axis (what gets read *into* context: files, history). Cause 4 is the **command-output** axis (tokens produced *by* the tools you run). `.claudeignore` cannot touch command output, and a command-output proxy cannot touch file reads — they are complementary, not substitutes. (Step 3.5 below adds an optional **third**, orthogonal lever — provider-side cache billing — distinct from both.) **Standalone install** — this skill works normally with plugin install only, without cloning the full meta-harness. **Built-in `/doctor` first (sister anchor, 2026-07-25)**: since the Claude 5 generation, the official `/doctor` command claims skill/CLAUDE.md rightsizing ("The new rules of context engineering for Claude 5 generation models" — https://claude.com/blog/the-new-rules-of-context-engineering-for-claude-5-generation-models). Run the built-in first when available — its scope is s...