debugger

debugger is a skill for Claude Code, Codex from yunseo-kim/agent-toolbox. It costs 27 tokens per session (1,368 once invoked), scanned A, original, no licence file.

A structured approach to finding the underlying cause of software problems. It uses techniques such as binary search, code-history bisecting, and testing possible explanations.

In plain words
What is it for?
Use it to investigate failing tests, unexpected behaviour, regressions, and other software issues before applying a fix.
Why use it?
It replaces guesswork with a repeatable way to narrow down where and why a bug occurs.

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/yunseo-kim/agent-toolbox/debugger
Any agent
npx skills add yunseo-kim/agent-toolbox --skill debugger
Clone the repo
git clone --depth 1 https://github.com/yunseo-kim/agent-toolbox

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/yunseo-kim/agent-toolbox/debugger.svg)](https://agentmods.dev/skills/yunseo-kim/agent-toolbox/debugger)
Your own site
<a href="https://agentmods.dev/skills/yunseo-kim/agent-toolbox/debugger"><img src="https://agentmods.dev/badge/skills/yunseo-kim/agent-toolbox/debugger.svg" alt="Measured on agentmods" height="20"></a>
Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,368 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00027 $0.01368
Opus 5 $0.00014 $0.00684
Sonnet 5 $0.00005 $0.00274
Haiku 4.5 $0.00003 $0.00137

Measured 4d ago against content hash 11672194b918, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 4d 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.

catalog/skills/debugger/SKILL.md · 233 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 4d ago First seen · 233 lines · 27 tokens per session scan A 11672194b918

Subscribe to this mod's changes

debugger is a skill published in the GitHub repository yunseo-kim/agent-toolbox (1 stars, last pushed yesterday), with no licence file. It adds 27 tokens to every session and 1,368 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.