CLAUDE_CODEX_SKILL.md

codex_skill.md

name	description	disable-model-invocation
codex	Use OpenAI Codex CLI for complex debugging, code analysis, or when stuck on difficult problems. Invokes Codex with a file-based question/answer pattern.	true

Using Codex for Complex Debugging

When you encounter a difficult problem that would benefit from a second perspective or deep analysis, use Codex via the file-based pattern.

When to Use

• Debugging subtle bugs (bitstream alignment, off-by-one errors)
• Analyzing complex algorithms against specifications
• Getting detailed code review with specific bug identification
• Understanding obscure file formats or protocols
• When you've tried multiple approaches and are stuck

The Pattern

Step 1: Create a Question File

Write to /tmp/question.txt with:

• Clear problem statement
• The specific error or symptom
• The relevant code (full functions, not snippets)
• What you've already tried
• Specific questions you want answered
• Request: "Please write a detailed analysis to /tmp/reply.txt"

Example structure:

I have a [component] that fails with [specific error].

Here is the full function:
[paste complete code]

Key observations:
1. [What works]
2. [What fails]
3. [When it fails]

Can you identify:
1. [Specific question 1]
2. [Specific question 2]

Please write a detailed analysis to /tmp/reply.txt

Step 2: Invoke Codex

cat /tmp/question.txt | codex exec --full-auto

Flags:

• exec: Non-interactive execution mode (required for CLI use)
• --full-auto: Run autonomously without prompts

Do NOT use the -o flag. The prompt already instructs Codex to write its analysis to /tmp/reply.txt via its own shell commands. Using -o /tmp/reply.txt would overwrite the actual analysis with Codex's conversational stdout (e.g. "Wrote the analysis...").

Step 3: Read the Reply

Read /tmp/reply.txt and evaluate suggestions critically. Codex may identify real bugs but can occasionally misinterpret specifications.

Tips

1. Provide complete code: Don't truncate functions. Codex needs full context.
2. Be specific: "Why does Huffman decoding fail after 1477 blocks?" > "Why does this fail?"
3. Include the spec: Mention relevant spec sections if debugging against a standard.
4. Verify suggestions: Codex is helpful but not infallible. Always verify against authoritative sources.
5. Iterate if needed: Create a new question.txt with additional context if first response doesn't solve the problem.

Common Issues

• "stdin is not a terminal": Use codex exec not bare codex
• No output: Check that -o flag has a valid path
• Timeout: Complex questions take time; --full-auto avoids blocking prompts

Quick Alternative

For shorter questions:

echo "Explain the JPEG progressive AC refinement algorithm" | codex exec --full-auto

But for debugging, the file-based pattern is better for refining questions and keeping records.

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