coding-debugging

A structured method for investigating software failures whose cause is not yet known. It covers reproducing the failure, narrowing down its cause, making an authorised fix, and checking that the failure does not return.

In plain words
What is it for?
Use it for failed tests, builds, runtime behaviour, integrations, or concurrent workflows. It helps record the failure, create a testable explanation, isolate the responsible condition, and verify the regression fix.
Why use it?
It prevents treating a passing build as proof that a fix is correct. The original symptom, environment, and evidence are kept clear while possible causes are tested.

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

Made for: Claude Code, Codex.

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,005 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 $0.00071 $0.01005
Opus 5 $0.00036 $0.00502
Sonnet 5 $0.00014 $0.00201
Haiku 4.5 $0.00007 $0.00101

Measured yesterday against content hash 1dc03b336e93, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coding-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 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.

app/agent/builtin_skills/coding-debugging/SKILL.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Debug a code failure

Treat debugging as a causal investigation. A passing build after an edit is not proof unless the edit explains the original symptom. Do not load bundled references when this skill activates.

Establish the failure contract

Record the exact input, environment, expected result, observed result, and earliest known failing boundary. Preserve the original error, stack, status, timing, or corrupted value. Distinguish a product failure from an incorrect test expectation or environment mismatch.

Reproduce and narrow

  1. Reproduce with the smallest deterministic command or interaction that still fails. If reproduction is blocked, identify the missing state or evidence.
  2. Compare one dimension at a time: input, configuration, version, process, timing, identity, or dependency.
  3. Trace backward from the first bad observation through state transitions and exact symbol relationships. Use literal discovery for errors, configuration, generated values, and registration keys.
  4. Form one falsifiable hypothesis. Run the cheapest check that could disprove it before editing production code.
  5. Keep a short hypothesis ledger when more than two plausible causes survive. Read references/hypothesis-led-debugging.md for the ledger format, failure classes, and causal-proof standard.

When the failure location or exact identifier is unknown, call code_context with action="search" once with the literal error, configuration key, runtime term, or code fragment. Use its repository-qualified source range to identify a declared symbol. If the exact symbol is already visible, skip code_context with action="search"; it is discovery, not structural proof.

Once source evidence reveals an exact function, method, class, or qualified symbol, use code_context to test the relevant structural hypothesis: callers for inbound paths, callees for downstream calls, references for non-call uses, or neighborhood for the immediate boundary. Start at depth 1. Static edges narrow the causal path but do not prove runtime order, state, or a race; preserve the reproduction as the final causal test.

Read the full file on GitHub · 98 lines

Files

What ships with it

4 files 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. yesterday First seen · 98 lines · 71 tokens per session scan A 1dc03b336e93

Subscribe to this mod's changes

coding-debugging is a skill published in the GitHub repository evoelsewhere/evoflux (5 stars, last pushed 5d ago), licensed Apache-2.0. It adds 71 tokens to every session and 1,005 once invoked, about $0.0004 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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