The in-session /doctor command now runs a structured audit across eight categories and proposes concrete fixes, replacing the old passive diagnostics screen.
Check 1 — Unused skills, MCP servers, and plugins: compares lifetime usage counters and scan-window transcript hits against always-resident context cost; recommends disabling dead weight
Check 2 — Local CLAUDE.md dedup: finds guidance in ~/.claude/CLAUDE.md / CLAUDE.local.md already covered by checked-in files; proposes removing the duplicates from local files only
Check 3 — Lazy-loading migration: identifies always-loaded CLAUDE.md content that belongs in a subdirectory CLAUDE.md or a lazy skill
Check 4 — Slow hooks: aggregates durationMs per hook from transcripts, warns on hooks that block every tool call above 2 s
Check 5 — Context-heavy extensions: estimates always-resident tokens per component
Check 6 — Version currency: compares installed version against the latest on the configured release channel
Check 7 — Auto mode as default: proposes setting "defaultMode": "auto" in ~/.claude/settings.json when not already set
Check 8 — Pre-approve denied read-only commands: aggregates transcript denials and proposes exact Bash(...) or mcp__server__tool allow rules for genuinely read-only operations
Confirms in at most two AskUserQuestion calls (cleanup + permissions), never one question per check
Also available as /checkup (alias)
Evidence
8-check doctor skill prompt (search for "Check 0 — setup health") — qnb() at line ~828108; new menu description (search for "Health-check your setup and fix issues")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agree/doctor is now a full setup checkup that can diagnose and fix issues; /checkup is its alias
