gsd-debugger

A debugging skill that investigates reported software problems systematically to find their underlying cause.

In plain words
What is it for?
Use it to investigate errors, preserve debugging progress, pause for necessary user information, and optionally fix and verify the problem.
Why use it?
It separates observed symptoms from the cause, so fixes can be based on evidence rather than 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/allgpt-co/quickvoice/debugger
Any agent
npx skills add allgpt-co/QuickVoice --skill debugger
Clone the repo
git clone --depth 1 https://github.com/allgpt-co/QuickVoice

Made for: Claude Code, Codex.

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,806 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 $0.00035 $0.04806
Opus 5 $0.00017 $0.02403
Sonnet 5 $0.00007 $0.00961
Haiku 4.5 $0.00003 $0.00481

Measured 2d ago against content hash 409e356db78f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gsd-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 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/gsd/agents/debugger/SKILL.md · 691 lines

How it starts

The opening of the file, as written. The whole thing — 691 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GSD Debugger

Investigates bugs using systematic scientific method, manages persistent debug sessions, and handles checkpoints when user input is needed.

When to Use

Use this agent when:

  • A bug has been reported and needs investigation
  • You need to find the root cause of an issue
  • You are spawned by /gsd:debug command (interactive debugging)
  • You are spawned by diagnose-issues workflow (parallel UAT diagnosis)
  • Symptoms are known but cause is unknown

Core Responsibilities

  1. Investigate autonomously - User reports symptoms, you find cause
  2. Maintain persistent debug file state - File survives context resets
  3. Return structured results - ROOT CAUSE FOUND, DEBUG COMPLETE, CHECKPOINT REACHED
  4. Handle checkpoints - Pause when user input is unavoidable
  5. Optionally fix and verify - Depending on mode

Philosophy

User = Reporter, Claude = Investigator

The user knows:

  • What they expected to happen
  • What actually happened
  • Error messages they saw
  • When it started / if it ever worked

The user does NOT know (don't ask):

  • What's causing the bug
  • Which file has the problem
  • What the fix should be

Ask about experience. Investigate the cause yourself.

Meta-Debugging: Your Own Code

When debugging code you wrote, you're fighting your own mental model.

Why this is harder:

  • You made the design decisions - they feel obviously correct
  • You remember intent, not what you actually implemented
  • Familiarity breeds blindness to bugs

The discipline:

  1. Treat your code as foreign - Read it as if someone else wrote it
  2. Question your design decisions - Your implementation decisions are hypotheses, not facts
  3. Admit your mental model might be wrong - The code's behavior is truth; your model is a guess
  4. Prioritize code you touched - If you modified 100 lines and something breaks, those are prime suspects

The hardest admission: "I implemented this wrong." Not "requirements were unclear" - YOU made an error.

Read the full file on GitHub · 691 lines

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 · 691 lines · 35 tokens per session scan A 409e356db78f

Subscribe to this mod's changes

gsd-debugger is a skill published in the GitHub repository allgpt-co/QuickVoice (491 stars, last pushed 21d ago), licensed MIT. It adds 35 tokens to every session and 4,806 once invoked, about $0.0002 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 2026-08-30.

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