debug

A workflow for finding the cause of a failing test, type check, build step, or running program, then applying a small fix.

In plain words
What is it for?
Use it with an error message, test name, or file path, or let it inspect the project's verification steps to find the first failure.
Why use it?
It focuses investigation on the reported failure and avoids unrelated code changes or guesses.

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/dixus/claudeframework/debug
Any agent
npx skills add dixus/claudeframework --skill debug
Clone the repo
git clone --depth 1 https://github.com/dixus/claudeframework

Made for: Claude Code, Codex.

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 476 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 $0.00028 $0.00476
Opus 5 $0.00014 $0.00238
Sonnet 5 $0.00006 $0.00095
Haiku 4.5 $0.00003 $0.00048

Measured 2d ago against content hash a0a9504bf4ec, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug 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.

.claude/skills/debug/SKILL.md · 37 lines

What it actually says

Diagnose and fix a specific failure. $ARGUMENTS is optional — pass an error message, test name, or file path to focus the investigation.

Goal

Identify the root cause and apply a minimal fix. Do not refactor surrounding code.

Steps

  1. Read CLAUDE.md — note the verify commands (typecheck, lint, test, build)
  2. Identify the failure:
    • If $ARGUMENTS contains an error message or test name, use it as the starting point
    • Otherwise run the full verify suite (typecheck → lint → tests) and capture the first failure
  3. Read the failing file(s) in full — understand the surrounding context before touching anything
  4. Form a hypothesis: one sentence describing the suspected root cause
  5. Validate the hypothesis before changing code:
    • Check if the problem is in the implementation, the test, or the type definitions
    • Look for similar patterns elsewhere in the codebase that work correctly — use Grep to find them
    • If the hypothesis is wrong, revise it; do not apply fixes based on an unvalidated guess
  6. Apply the minimal fix — change only what the root cause demands
    • Do not add defensive code, logging, or error handling unless directly required by the bug
    • If the fix requires touching more than 3 files, pause and describe the situation to the user — the bug may be systemic
  7. Re-run the specific failing command to confirm the fix works
  8. Run the full verify suite to confirm no regressions were introduced
  9. If the verify suite still fails, return to step 4 with the new failure — do not apply a second fix on top of an incomplete first fix
  10. Report:
    • Root cause (one sentence)
    • Files changed and what changed
    • Verify status before and after
    • If the bug suggests a missing rule in CLAUDE.md or a context file, flag it — do not add it unilaterally
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 · 37 lines · 28 tokens per session scan A a0a9504bf4ec

Subscribe to this mod's changes

debug is a skill published in the GitHub repository dixus/claudeframework (10 stars, last pushed 4mo ago), licensed MIT. It adds 28 tokens to every session and 476 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.

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