What do I need to use Prompt Debugging?

The prompt; What it's doing wrong; What you want; The pattern.

Is Prompt Debugging free to use?

Yes — run it free in the browser playground (no API key needed for the sponsored trial, or bring any provider key), or install it into Claude Code, Cursor, ChatGPT and more via npx pm-claude-skills. MIT-licensed and open source.

Prompt Debugging

Q: How do I know the Prompt Debugging output is good?

The skill verifies itself against its own quality checks: Diagnoses a specific failure mode before rewriting; Applies the fix that matches the cause; Uses an example where the problem is format/quality; Checks the fix generalizes beyond one case.

🔵 Stable🕐 updated 2026-08-18 🔷 SkillSpec L3 pm-ai-native

Figure out why a prompt isn't working and fix it — diagnose the actual failure (ambiguity, missing context, wrong format, conflicting instructions) instead of randomly rewording. Use when asked why isn't my prompt working, the AI keeps ignoring my instructions, my prompt gives inconsistent results, or how do I fix this prompt. Produces a diagnosis of the specific failure mode, the targeted fix for it (not a vibes rewrite), a corrected prompt, a check that it generalizes rather than fixing one case, and the principle behind the fix so you stop hitting it — turning prompt frustration into a debuggable, repeatable process.

▶ Run it free — no key needed 📝 Grade your existing draft View SKILL.md ↗

🗣 Say this to your agent

“Why isn't my prompt working?”“The AI keeps ignoring one of my instructions — why?”“My prompt gives me different results every time.”“Help me fix this prompt, it's not doing what I want.”“How do I get consistent output from this prompt?”

What to give it

▸The prompt — the actual text that's misbehaving

▸What it's doing wrong — ignoring an instruction, wrong format, inconsistent, off-topic

▸What you want — the correct output, ideally with an example

▸The pattern — does it fail always or sometimes (points at ambiguity vs. a hard miss)

✅ The bar it holds itself to

Every skill in this library self-verifies — these are this skill's own quality checks, straight from its definition.

✓Diagnoses a specific failure mode before rewriting

✓Applies the fix that matches the cause

✓Uses an example where the problem is format/quality

✓Checks the fix generalizes beyond one case

✓Names the principle; flags when it's a model limit, not a prompt one

⚠️ What it refuses to do

**Randomly rewording** until something works, learning nothing.

**Fixing to one example** and overfitting.

**Adding more words** when the issue is a conflict or buried instruction.

**Describing the format** instead of showing it.

**Blaming the model** when the prompt is fixable — or the reverse.

Install

npx pm-claude-skills add --agent claude   # or codex · cursor · gemini · hermes
# or one-line MCP (every skill, any client):
claude mcp add pm-skills -- npx -y pm-claude-skills-mcp

Related skills

🔌 Embed this skill

Drop this on your blog, docs, or site — it renders a "Run this skill" card:

<div data-pm-skill="prompt-debugging"></div>
<script src="https://mohitagw15856.github.io/pm-claude-skills/embed.js" async></script>

💬 Discussion

Prompt Debugging is one of 1153 open-source professional AI agent skills — all SkillSpec L3. Try them all in the browser · ⭐ Star on GitHub · Browse the full catalog