debugger

debugger is a skill for Claude Code, Codex from d-o-hub/github-template-ai-agents. It costs 88 tokens per session (609 once invoked), scanned A, original, MIT.

A debugging guide for finding the underlying cause of failed builds, deployment problems, and runtime errors. It recommends reproducing the problem, narrowing its cause, fixing it, and checking the result.

In plain words
What is it for?
It is for investigating crashes, exceptions, hangs, failed builds, failed deployments, and errors in continuous integration systems.
Why use it?
It helps avoid chasing later error messages or applying fixes that only hide the original failure.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

Good fit It is for investigating crashes, exceptions, hangs, failed builds, failed deployments, and errors in continuous integration systems.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/d-o-hub/github-template-ai-agents/debugger
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.

Any agent
npx skills add d-o-hub/github-template-ai-agents --skill debugger
Clone the repo
git clone --depth 1 https://github.com/d-o-hub/github-template-ai-agents

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for debugger

README.md
[![agentmods](https://agentmods.dev/badge/skills/d-o-hub/github-template-ai-agents/debugger/github.svg)](https://agentmods.dev/skills/d-o-hub/github-template-ai-agents/debugger)
Your own site
<a href="https://agentmods.dev/skills/d-o-hub/github-template-ai-agents/debugger"><img src="https://agentmods.dev/badge/skills/d-o-hub/github-template-ai-agents/debugger/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for debugger

Your own site · 80×15
<a href="https://agentmods.dev/skills/d-o-hub/github-template-ai-agents/debugger"><img src="https://agentmods.dev/badge/skills/d-o-hub/github-template-ai-agents/debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 609 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00088 $0.00609
Opus 5.5 $0.00035 $0.00244
Sonnet 5.5 $0.00018 $0.00122
Haiku 4.5 $0.00009 $0.00061

Measured 25d ago against content hash af1b4ddc07e2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

debugger 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 25d 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.

.agents/skills/debugger/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Debugger

Root-cause diagnosis for failing builds and runtime errors. Symptoms first, theories second, fixes last.

When to Use

  • Build, deploy, or CI pipeline fails
  • Runtime crash, panic, exception, or hang
  • Error output that is cryptic or misleading
  • Even if they just say "debug this crash" or "the build is red"

Steps

  1. Read the error first — full output, not the last line. Note exit codes, file:line locations, and the first failure (later ones cascade).
  2. Reproduce minimally — smallest command or input that triggers it. If it only fails in CI, diff the environments (versions, env vars, cwd).
  3. Form one hypothesis — state the suspected cause before changing code.
  4. Bisect — halve the search space (recent commits, config halves, feature flags) until the trigger commit or line is isolated.
  5. Fix at the root — patch the cause, not the symptom; add the minimal reproducer as a regression test.
  6. Verify — rerun the reproducer plus the surrounding suite green.

Common Traps

  • Fixing the second error in the log while the first (causal) one remains.
  • "Works on my machine" without diffing dependency or environment versions.
  • Treating flaky as fixed after one green run — rerun at least 3 times.

Rationalizations

Rationalization Reality
"The error message says what's wrong, just fix that line" Error text reports where it surfaced, not where it started; trace to the cause.
"I'll just retry, it was probably flaky" Uninvestigated flakes become incidents; reproduce or explicitly classify with evidence.

Red Flags

  • Changing code before stating a hypothesis
  • Closing as flaky without rerun evidence or a tracking issue
  • Fix without a regression test

See Also

  • test-runner — Execute tests and diagnose failures inside a test suite
  • iterative-refinement — Repeat-until-pass validation loops once the cause is known
  • security-code-auditor — Vulnerability analysis, not failure diagnosis

Read the full file on GitHub · 62 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 25d ago First seen · 62 lines · 88 tokens per session scan A af1b4ddc07e2

Subscribe to this mod's changes

debugger is a skill published in the GitHub repository d-o-hub/github-template-ai-agents (2 stars, last pushed yesterday), licensed MIT. It adds 88 tokens to every session and 609 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-09-28.

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