debug

A debugging assistant for investigating errors and unexpected behavior in a software project.

In plain words
What is it for?
Use it to inspect code flow, find type or syntax errors, investigate runtime and network issues, check dependencies, and test proposed changes.
Why use it?
It helps narrow a problem from symptoms such as error messages, logs, or incorrect output to likely causes and a verified fix.

Command for Claude Code

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 commands/justdvp/claude-code-templates/debug
Clone the repo
git clone --depth 1 https://github.com/Justdvp/claude-code-templates

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 318 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 $0.00000 $0.00318
Opus 5 $0.00000 $0.00159
Sonnet 5 $0.00000 $0.00064
Haiku 4.5 $0.00000 $0.00032

Measured yesterday against content hash 1ebf63ad8347, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 yesterday.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

  • debug — 100% identical, 0 lines differ
cli-tool/templates/javascript-typescript/.claude/commands/debug.md · 52 lines

What it actually says

Debug Assistant

Help me debug the issue with $ARGUMENTS in this project.

Task

I'll help you identify and fix the problem by:

  1. Understanding the issue description
  2. Analyzing relevant code
  3. Identifying potential causes
  4. Suggesting and implementing fixes
  5. Verifying the solution works

Process

I'll follow these steps:

  1. Examine error messages, logs, or unexpected behaviors
  2. Locate relevant files and code sections
  3. Analyze the code flow and potential failure points
  4. Identify common JavaScript/TypeScript pitfalls that might apply
  5. Suggest specific fixes with explanations
  6. Help implement and test the solution

Debugging Techniques

I'll apply appropriate debugging techniques such as:

  • Static code analysis to find syntax or type errors
  • Runtime error analysis from logs or stack traces
  • Control flow tracing to understand execution paths
  • State inspection to identify incorrect values
  • Dependency analysis to find version conflicts
  • Network request inspection for API issues
  • Browser console analysis for frontend problems
  • Database query inspection for data issues

Common Issues I Can Help With

  • Type errors and null/undefined issues
  • Asynchronous code problems (Promises, async/await)
  • React/Vue/Angular component lifecycle issues
  • API integration problems
  • State management bugs
  • Performance bottlenecks
  • Memory leaks
  • Build/compilation errors
  • Testing failures
  • Environment configuration issues

I'll adapt my approach based on your specific project structure, frameworks, and the nature of the problem.

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. yesterday First seen · 52 lines · 0 tokens per session scan A 1ebf63ad8347

Subscribe to this mod's changes

debug is a command published in the GitHub repository Justdvp/claude-code-templates (7 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 318 tokens. 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.