debug

debug is a skill for Claude Code from swt-labs/vibe-better-with-claude-code-vbw. It costs 34 tokens per session (522 once invoked), scanned A, original, MIT.

A bug-investigation command that examines a problem by reproducing it, tracing the code, and checking recent changes. It reports the likely root cause, supporting evidence, and a proposed fix.

In plain words
What is it for?
Use it when software behaves unexpectedly and you need to understand what caused the problem before deciding whether to apply a fix.
Why use it?
It replaces guesswork with several lines of investigation before code is changed.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the vbw plugin — 34 skills, 7 agents, 4 hooks shipped together

Good fit Use it when software behaves unexpectedly and you need to understand what caused the problem before deciding whether to apply a fix.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add swt-labs/vibe-better-with-claude-code-vbw
Claude Code
/plugin install vbw

Made for: Claude Code.

Or install vbw, the plugin that ships this one along with the rest of its 34 skills, 7 agents, 4 hooks.

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 debug

README.md
[![agentmods](https://agentmods.dev/badge/skills/swt-labs/vibe-better-with-claude-code-vbw/debug/github.svg)](https://agentmods.dev/skills/swt-labs/vibe-better-with-claude-code-vbw/debug)
Your own site
<a href="https://agentmods.dev/skills/swt-labs/vibe-better-with-claude-code-vbw/debug"><img src="https://agentmods.dev/badge/skills/swt-labs/vibe-better-with-claude-code-vbw/debug/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 debug

Your own site · 80×15
<a href="https://agentmods.dev/skills/swt-labs/vibe-better-with-claude-code-vbw/debug"><img src="https://agentmods.dev/badge/skills/swt-labs/vibe-better-with-claude-code-vbw/debug.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 522 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 $0.00034 $0.00522
Opus 5.5 $0.00014 $0.00209
Sonnet 5.5 $0.00007 $0.00104
Haiku 4.5 $0.00003 $0.00052

Measured today against content hash 888d397b9c21, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 today.

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.

plugin/skills/debug/SKILL.md · 33 lines

What it actually says

"${CLAUDE_PLUGIN_ROOT}/bin/vbw" config models 2>&1 || true
"${CLAUDE_PLUGIN_ROOT}/bin/vbw" config effort 2>&1 || true
"${CLAUDE_PLUGIN_ROOT}/bin/vbw" workflows on 2>&1 || true
"${CLAUDE_PLUGIN_ROOT}/bin/vbw" interview 2>&1 || true

Write to the user's level, explanation depth and involvement (above; "-": plain words), and pass them to the workflow as "profile": {"level", "depth", "involvement"} (none for "-").

The problem, in the user's words: $ARGUMENTS

If that is empty, ask what is wrong (what they did, what happened, what they expected). VBW needs the Workflow tool: the workflows line above turns it on (say so in one line when it did); without it, say why and stop. (Outside a VBW project the models line shows an error; omit models.)

Start the Workflow vbw:investigating with args {"problem": "<the problem>", "models": <the JSON above>, "effort": <the effort JSON above>, "profile": ...}. When it returns, tell the user the root cause, its evidence, rejected hypotheses, confidence and the proposed fix, then ask whether to fix it now. If yes, start the Workflow again with args {"problem": "<the problem>", "fix": <the diagnosis it returned>, "models": ..., "effort": ..., "profile": ...}: one Debugger fixes the root cause, adds a regression test, commits and verifies (vbw prove in a VBW project). In a VBW project, then record that the user asked for the fix, naming each file it returned by its path: vbw decide "Debug fix: <root cause>, in <file>, <file>" "the user asked for the fix (/vbw:debug)", so QA takes the change as the user's, not as a deviation from a plan. Report what changed.

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. today First seen · 33 lines · 34 tokens per session scan A 888d397b9c21

Subscribe to this mod's changes

debug is a skill published in the GitHub repository swt-labs/vibe-better-with-claude-code-vbw (85 stars, last pushed today), licensed MIT. It adds 34 tokens to every session and 522 once invoked, about $0.0001 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 2026-10-22.

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