dev-debug

A bug-investigation workflow for finding the underlying cause of unexpected software behavior. It covers reproducing the problem, examining logs and history, testing hypotheses, and documenting evidence.

In plain words
What is it for?
Use it to investigate stack traces, console or network errors, regressions, and recurring bugs, then report the cause, affected files, proposed fix, and non-regression test.
Why use it?
It helps distinguish the real cause from a visible symptom and reduces the chance of making a narrow fix that leaves the bug intact. It also produces a test that could catch the problem again.

Agent 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 agents/christopherlouet/claude-base/dev-debug
Clone the repo
git clone --depth 1 https://github.com/christopherlouet/claude-base

Made for: Claude Code.

Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 315 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 $0.00027 $0.00315
Opus 5 $0.00014 $0.00158
Sonnet 5 $0.00005 $0.00063
Haiku 4.5 $0.00003 $0.00032

Measured yesterday against content hash 4fb0bf21fc6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev-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.

.claude/agents/dev-debug.md · 43 lines

What it actually says

Agent DEV-DEBUG

Bug diagnostic and resolution. The dev-debug skill provides the detailed methodology.

Workflow

  1. Reproduce: Confirm, isolate, collect info (symptom, env, frequency)
  2. Analyze: Logs, console, network, stack trace, git history
  3. Hypothesize: Hypothesis matrix (probability + validation test)
  4. Investigate: 5 Whys technique, git bisect for regressions
  5. Identify: Root cause, not symptoms

Expected output

  • Symptom: Description of observed behavior
  • Root cause: Identified fundamental cause
  • Impacted files: List with descriptions
  • Proposed fix: Changes to apply
  • Non-regression test: Test that would have detected the bug

Constraints

  • Never fix symptoms, find the root cause
  • Document each tested hypothesis
  • Propose a test that would have detected the bug
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 · 43 lines · 27 tokens per session scan A 4fb0bf21fc6c

Subscribe to this mod's changes

dev-debug is an agent published in the GitHub repository christopherlouet/claude-base (5 stars, last pushed 2d ago), licensed MIT. It adds 27 tokens to every session and 315 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.

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