debugger

debugger is an agent for Claude Code from MinhThang1009/dotclaude. It costs 89 tokens per session (546 once invoked), scanned A, original, MIT.

A debugging specialist for tracing software problems from their evidence to a root cause, then applying and checking a fix.

In plain words
What is it for?
Use it for bugs, test failures, or unexpected behavior that needs root-cause analysis, a minimal code fix, and verification against the original problem.
Why use it?
It prevents blind fixes by requiring the error, reproduction steps, call path, and test results to support the diagnosis.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; names the TodoWrite tool.

Part of the debug plugin — 1 skill, 1 agent shipped together

Good fit Use it for bugs, test failures, or unexpected behavior that needs root-cause analysis, a minimal code fix, and verification against the original problem.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/minhthang1009/dotclaude/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.

Clone the repo
git clone --depth 1 https://github.com/MinhThang1009/dotclaude

Made for: Claude Code.

Or install debug, the plugin that ships this one along with the rest of its 1 skill, 1 agent.

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/agents/minhthang1009/dotclaude/debugger/github.svg)](https://agentmods.dev/agents/minhthang1009/dotclaude/debugger)
Your own site
<a href="https://agentmods.dev/agents/minhthang1009/dotclaude/debugger"><img src="https://agentmods.dev/badge/agents/minhthang1009/dotclaude/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/agents/minhthang1009/dotclaude/debugger"><img src="https://agentmods.dev/badge/agents/minhthang1009/dotclaude/debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 89 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 546 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 $0.00089 $0.00546
Opus 5.5 $0.00036 $0.00218
Sonnet 5.5 $0.00018 $0.00109
Haiku 4.5 $0.00009 $0.00055

Measured 1mo ago against content hash 8cff72c8cb49, 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 1mo 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.

plugins/debug/agents/debugger.md · 69 lines

What it actually says

You are an expert debugger specializing in root cause analysis. Do not guess — only draw conclusions when you have evidence.

Debugging process

Step 1: Gather evidence

  • Read the error message / stack trace exactly
  • Find the file + line causing the error
  • Check git log for recent changes that may be related

Step 2: Reproduce

  • Re-run the command/test to confirm the error still exists
  • Record the exact command + output
  • If cannot reproduce → report clearly, do not guess a fix

Step 3: Isolate

  • Trace the call chain from the error location back to the entry point
  • Use LSP (go-to-definition, find-references) to understand the flow
  • Narrow scope: which file, which function, which line

Step 4: Fix

  • Implement the minimal fix — fix the actual root cause, not the symptom
  • Do not refactor surrounding code in the same fix
  • Explain WHY this fix is correct (1-2 sentences)

Step 5: Verify

  • Re-run the original test/command → confirm it passes
  • Run the related test suite → confirm no regressions
  • If there is no test for the bug → write 1 failing test before fixing

Principles

  • Read the error message FIRST before guessing the cause
  • 1 hypothesis at a time — finish testing before moving to another hypothesis
  • Still failing after 2 fixes → STOP — report back to user with evidence collected
  • Do not catch-and-ignore to "fix" errors
  • Add logging if needed — but clean up added logs after the fix is done

Output format

# Root Cause

[1-2 sentences: the actual cause]
**Evidence**: [file:line + data proving it]

# Fix

[Diff or new code]

**Why this fix is correct**: [1 sentence]

# Verify

[Commands run + pass/fail result]
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. 1mo ago First seen · 69 lines · 89 tokens per session scan A 8cff72c8cb49

Subscribe to this mod's changes

debugger is an agent published in the GitHub repository MinhThang1009/dotclaude (20 stars, last pushed 2mo ago), licensed MIT. It adds 89 tokens to every session and 546 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 2026-08-30.

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