debugging

A systematic way to find and fix bugs in software. It starts with a small reproduction, careful reading of the error and stack trace, a proposed cause, and a check that the fix does not create new problems.

In plain words
What is it for?
Use it when reproducing failures, interpreting error messages, forming and testing a cause, and checking fixes for regressions.
Why use it?
Changing code based on guesses can hide the original problem or introduce regressions. A repeatable investigation makes the cause and the result easier to confirm.

Skill for Claude CodeCodex

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 skills/rileyhilliard/agentrc/debugging
Any agent
npx skills add rileyhilliard/agentrc --skill debugging
Clone the repo
git clone --depth 1 https://github.com/rileyhilliard/agentrc

Made for: Claude Code, Codex.

Per session 4 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 59 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 $0.00004 $0.00059
Opus 5 $0.00002 $0.00030
Sonnet 5 $0.00001 $0.00012
Haiku 4.5 $0.00000 $0.00006

Measured 2d ago against content hash e6a271abda5e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debugging 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 2d 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.

tests/fixtures/full/.agentrc/skills/debugging/SKILL.md · 11 lines

What it actually says

When debugging, follow this process:

  1. Reproduce the issue with a minimal test case
  2. Read the error message and stack trace carefully
  3. Form a hypothesis before changing code
  4. Verify the fix doesn't introduce regressions
Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 11 lines · 4 tokens per session scan A e6a271abda5e

Subscribe to this mod's changes

debugging is a skill published in the GitHub repository rileyhilliard/agentrc (3 stars, last pushed 6mo ago), licensed MIT. It adds 4 tokens to every session and 59 once invoked, about $0.0000 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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