Breaking

Claude Code Adds Automated Prompt Audit Tool to Clean Legacy Instructions

October 5, 2026 at 14:16 EDT

Software Dev & Coding
Foundation Models

Claude Code has introduced a new /doctor prompt-audit command designed to help developers automatically identify and repair outdated instructions that can degrade performance on newer models like Opus 5.5. The tool scans project CLAUDE.md files, custom skills, agents, and slash commands to catch stale file paths, renamed CLI commands, contradicting instruction sets, and prompting patterns written for earlier model generations.

Claude Code Automation

Opus 5.5 Demands Leaner Prompts

New prompt-audit tools help teams identify and remove outdated instructions that drain tokens and cost on modern frontier models.

40%

Lower cost vs. Opus 5

30%

Faster output generation

20%+

Typical prompt shrinkage

What the audit finds and fixes

Problems Detected

Dead file paths & stale references
Renamed or removed CLI commands
Contradicting instructions across files
Legacy model-specific patterns

Instructions to Remove

Capitalized emphasis directives
Artificial verification steps
Reasoning scaffolding
Thinking-mode guidance

Comparison: Before & After Audit

Before Audit

Legacy instructions

→

After Audit

Optimized 40%

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