Claude Prompt Debugger

It analyzes prompts for Claude-specific bugs that generic tools miss: XML tag mismatches, instruction overflow past the 150-limit, subagent context leaks, hallucination risks, lost-in-the-middle placement issues, and more.

CLAUDE.md files should contain fewer than 150 instructions (for Sonnet) or 80 (for Haiku). Beyond that, Claude silently ignores rules in unpredictable order. The debugger counts and warns you automatically.

Claude subagents have zero memory of parent conversations. Phrases like 'as discussed' or 'as mentioned earlier' will cause hallucinations in subagent prompts. The debugger flags these references.

All analysis happens 100% in your browser. No data is sent to any server. Your prompts never leave your device.

LLMs including Claude recall the beginning and end of prompts much better than the middle. Output format instructions placed in the middle zone (20-75% in) get ignored frequently. The debugger detects and flags this.