evidence-debugging

evidence-debugging is a skill for Claude Code, Codex from sainteye/clawdline. It costs 44 tokens per session (452 once invoked), scanned A, original, MIT.

A method for investigating difficult bugs and repeated failures by collecting evidence at the point where behavior goes wrong. It compares expected and actual behavior instead of guessing a cause from a single symptom.

In plain words
What is it for?
Use it to reproduce and record failures, trace values across component boundaries, test falsifiable hypotheses, compare working paths, and choose the smallest fix at the responsible boundary.
Why use it?
It reduces the risk of stacking patches on the wrong diagnosis, especially for intermittent failures, stalled work, dropped events, and unreliable delivery.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to reproduce and record failures, trace values across component boundaries, test falsifiable hypotheses, compare working paths, and choose the smallest fix at the responsible boundary.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sainteye/clawdline/evidence-debugging
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.

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

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for evidence-debugging

README.md
[![agentmods](https://agentmods.dev/badge/skills/sainteye/clawdline/evidence-debugging/github.svg)](https://agentmods.dev/skills/sainteye/clawdline/evidence-debugging)
Your own site
<a href="https://agentmods.dev/skills/sainteye/clawdline/evidence-debugging"><img src="https://agentmods.dev/badge/skills/sainteye/clawdline/evidence-debugging/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for evidence-debugging

Your own site · 80×15
<a href="https://agentmods.dev/skills/sainteye/clawdline/evidence-debugging"><img src="https://agentmods.dev/badge/skills/sainteye/clawdline/evidence-debugging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 452 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00044 $0.00452
Opus 5.5 $0.00018 $0.00181
Sonnet 5.5 $0.00009 $0.00090
Haiku 4.5 $0.00004 $0.00045

Measured today against content hash 12bf03169a4a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

evidence-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 today.

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.

skills/evidence-debugging/SKILL.md · 19 lines

What it actually says

Evidence-led debugging

Find the failing boundary before choosing a fix. Apply the current task and repository rules, including the existing targeted check gate and shared-tree ownership. This skill grants no permission to install, dispatch, deploy, spend, or restart anything.

  1. Record the trigger, expected behavior, actual behavior, and exact revision or running version. Read the real error and nearby code. If reproduction is intermittent, preserve that uncertainty and gather evidence rather than naming a cause from one failure.
  2. Follow the value or operation through its callers and component boundaries. For sends and stalls, distinguish acceptance, execution, delivery, observation, and acknowledgement; inspect queue bounds, retries, receipts, resume and failure isolation. Inspect only task-relevant state and redact secrets from diagnostics.
  3. State a falsifiable hypothesis and the observation that would disprove it. Compare a working path or version when available; vary one cause at a time. Repeated unsuccessful patches are a reason to revisit the model of the system, not stack another timeout on it.
  4. Fix at the earliest responsible boundary with the smallest sufficient change. For behavioral fixes, prove a focused reproduction fails without the fix and succeeds with it, in an isolated tree. Use the repository's existing local gate; broader checks remain governed by project policy.
  5. Report the observed cause, correction, evidence and remaining uncertainty. Keep temporary mitigation distinct from a verified fix. Continue authorized work without adding approval checkpoints for routine implementation choices.

Keep invocation and verification evidence in the normal Session history. If the current project has an approved workflow pilot, follow its own checkpoint and evidence limits. Do not start separate model calls to evaluate the skill during ordinary work.

Adapted from obra/superpowers systematic-debugging at commit 2ce8aa15d05bd57213e6f746f953aafb7ded7a8b. Copyright (c) 2025 Jesse Vincent, MIT. Clawdline-specific workflow and permission boundaries are local adaptations.

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. today First seen · 19 lines · 44 tokens per session scan A 12bf03169a4a

Subscribe to this mod's changes

evidence-debugging is a skill published in the GitHub repository sainteye/clawdline (1 stars, last pushed today), licensed MIT. It adds 44 tokens to every session and 452 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-30.

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