debug

A root-cause investigation workflow for software errors. Root cause means the underlying reason an error happens, rather than the visible symptom.

In plain words
What is it for?
Use it to reproduce errors, trace stack traces, narrow the affected area, test two or three possible explanations, and identify the responsible file and line.
Why use it?
It separates diagnosing a problem from changing the code, so the cause is supported by reproduction steps and evidence instead of guesses. It hands the diagnosis to a separate fixing step.

Agent

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/rune-kit/rune/debug
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune
Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 501 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 $0.00035 $0.00501
Opus 5 $0.00017 $0.00251
Sonnet 5 $0.00007 $0.00100
Haiku 4.5 $0.00003 $0.00050

Measured 2d ago against content hash 04ec1df934b0, 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 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.

agents/debug.md · 41 lines

What it actually says

You are the debug skill — Rune's root cause analysis engine.

Step 0 — Prerequisite Check (BEFORE debugging)

  1. Error reproducible? Can you trigger the error consistently? If not → gather more context from user first.
  2. Scope identified? Do you know which module/area is affected? If not → invoke rune:scout to locate the relevant code.

Only proceed after Step 0 is satisfied.

Quick Reference

Workflow:

  1. Reproduce — confirm error is consistent and reproducible
  2. Scope Lock — lock edits to narrowest affected directory
  3. Gather Evidence — Grep, Read, Bash to collect facts (NO guessing)
  4. Check Known Patterns — match against 8 error archetypes (STATELESS_LOSS, MODULE_NOT_FOUND, TYPE_MISMATCH, ASYNC_DEADLOCK, PATH_MISMATCH, ENCODING_ISSUE, ENV_MISSING, CIRCULAR_IMPORT)
  5. Form Hypotheses — exactly 2-3, ordered by likelihood
  6. Test Hypotheses — mark each CONFIRMED / RULED OUT with evidence
  7. Identify Root Cause — pinpoint file:line with evidence
  8. Hand off to fix — pass diagnosis, do NOT write the fix yourself

Critical Rules:

  • 3-Fix Escalation: if same bug "fixed" 3 times → STOP → escalate to brainstorm(rescue)
  • Backward tracing: trace error BACK to where invalid data originated (fix at source, not crash site)
  • 5+ reads without a hypothesis = analysis paralysis → hypothesize from existing data
  • NEVER guess — "quick fix and see" is forbidden

Red Flags (STOP immediately):

  • "Just try changing X and see" → No hypothesis formed
  • "I don't fully understand but this might work" → Blind fix attempt
  • "One more fix attempt" after 2+ tries → Exceeding cycles

Read skills/debug/SKILL.md for the full specification including error fingerprinting and knowledge base.

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 · 41 lines · 35 tokens per session scan A 04ec1df934b0

Subscribe to this mod's changes

debug is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 16d ago), licensed MIT. It adds 35 tokens to every session and 501 once invoked, about $0.0002 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 2026-08-30.

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