debug-error

A troubleshooting workflow for finding the cause of an error, bug, failing test, or unexpected program behavior.

In plain words
What is it for?
Use it to inspect stack traces, trace calls backward, check likely causes, apply a fix, run related tests, and look for similar problems elsewhere.
Why use it?
It connects the reported error to the responsible code and recent changes instead of treating only the visible symptom.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/huzaifa525/claude-code-optimizer/debug-error
Any agent
npx skills add huzaifa525/claude-code-optimizer --skill debug-error
Clone the repo
git clone --depth 1 https://github.com/huzaifa525/claude-code-optimizer

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 406 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00025 $0.00406
Opus 5 $0.00013 $0.00203
Sonnet 5 $0.00005 $0.00081
Haiku 4.5 $0.00003 $0.00041

Measured 2d ago against content hash 5bc744edd8e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-error scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

templates/.claude/skills/debug-error/SKILL.md · 65 lines

What it actually says

Debug and fix: $ARGUMENTS

Steps

  1. Parse the error

    • Identify error type (runtime, compile, type, network, etc.)
    • Extract file paths and line numbers from stack trace
    • Identify the error message
  2. Find the source

    • Read the file(s) mentioned in the stack trace
    • If no stack trace, Grep for the error message in codebase
    • Read surrounding code to understand context
  3. Trace the root cause

    • Follow the call chain backwards
    • Check recent git changes that might have caused it:
      git log --oneline -10
      git diff HEAD~3
      
    • Look for common causes: null/undefined, wrong types, missing imports, race conditions
  4. Implement the fix

    • Fix the root cause, not just the symptom
    • Handle edge cases that led to the error
  5. Verify

    • Run the failing scenario
    • Run related tests
    • Check for similar patterns elsewhere:
      grep -r "similar_pattern" src/
      
  6. Report

    ## Bug Fix Report
    
    ### Error
    [original error]
    
    ### Root Cause
    [why it happened]
    
    ### Fix
    [what was changed and why]
    
    ### Files Modified
    - [file] — [change]
    
    ### Verified
    - [how it was tested]
    
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 65 lines · 25 tokens per session scan A 5bc744edd8e9

Subscribe to this mod's changes

debug-error is a skill published in the GitHub repository huzaifa525/claude-code-optimizer (9 stars, last pushed 5mo ago), licensed MIT. It adds 25 tokens to every session and 406 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.