debug

A command for investigating software bugs by collecting symptoms, tracing the code path, testing likely causes, and checking the result. A regression test is an automated check that prevents the same bug from returning.

In plain words
What is it for?
Use it to analyze error reports, inspect recent changes, test data or logic problems, diagnose state and environment issues, implement a fix, and add a regression test.
Why use it?
It replaces guesswork with a repeatable investigation based on evidence, reproduction steps, and targeted tests.

Command

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/rohitg00/awesome-claude-code-toolkit/debug
Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit
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 335 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 $0.00335
Opus 5 $0.00000 $0.00168
Sonnet 5 $0.00000 $0.00067
Haiku 4.5 $0.00000 $0.00034

Measured yesterday against content hash 899155c50712, 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.

plugins/bug-detective/commands/debug.md · 39 lines

What it actually says

Systematically debug an issue by analyzing symptoms, forming hypotheses, and testing them.

Steps

  1. Gather the bug report: error message, stack trace, reproduction steps, expected vs actual behavior.
  2. Identify the entry point where the issue manifests (endpoint, UI action, CLI command).
  3. Trace the execution path from entry to error:
    • Read the code path that handles the triggering action.
    • Check for recent changes in the affected files: git log --oneline -10 -- <file>.
    • Look for related error handling or edge cases.
  4. Form hypotheses ranked by likelihood:
    • Data issue: unexpected null, wrong type, missing field.
    • Logic error: incorrect condition, off-by-one, wrong operator.
    • State issue: race condition, stale cache, missing initialization.
    • Environment: missing config, version mismatch, network failure.
  5. Test each hypothesis:
    • Add targeted logging or breakpoints.
    • Write a minimal reproduction test case.
    • Check edge cases around the failure point.
  6. Implement the fix and verify it resolves the issue.
  7. Add a regression test that would catch the bug if reintroduced.

Format

Bug: <description>
Root Cause: <what actually went wrong>
Fix: <what was changed>
Files: <list of modified files>
Test: <regression test added>

Rules

  • Start with the simplest hypothesis before investigating complex causes.
  • Never fix a bug without understanding the root cause.
  • Always add a regression test for the fix.
  • Check if the same bug pattern exists elsewhere in the codebase.
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 · 39 lines · 0 tokens per session scan A 899155c50712

Subscribe to this mod's changes

debug is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,570 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 335 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 2026-08-30.