scan-for-defects

scan-for-defects is a skill for Claude Code, Codex from HuginnIndustries/CodeCartographer. It costs 62 tokens per session (1,920 once invoked), scanned A, original, MIT.

A multi-step code review that looks for defects in logic, error handling, concurrent operations, security, API agreements, and configuration.

In plain words
What is it for?
It helps audit an unfamiliar codebase for correctness, security, reliability, and mismatches between the code and its expected behavior.
Why use it?
It reduces the chance that important bugs or unsafe behavior remain hidden after the code’s structure is understood.

Skill for Claude CodeCodex

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

Good fit It helps audit an unfamiliar codebase for correctness, security, reliability, and mismatches between the code and its expected behavior.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/huginnindustries/codecartographer/defect-scan
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 HuginnIndustries/CodeCartographer --skill defect-scan
Clone the repo
git clone --depth 1 https://github.com/HuginnIndustries/CodeCartographer

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 scan-for-defects

README.md
[![agentmods](https://agentmods.dev/badge/skills/huginnindustries/codecartographer/defect-scan/github.svg)](https://agentmods.dev/skills/huginnindustries/codecartographer/defect-scan)
Your own site
<a href="https://agentmods.dev/skills/huginnindustries/codecartographer/defect-scan"><img src="https://agentmods.dev/badge/skills/huginnindustries/codecartographer/defect-scan/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 scan-for-defects

Your own site · 80×15
<a href="https://agentmods.dev/skills/huginnindustries/codecartographer/defect-scan"><img src="https://agentmods.dev/badge/skills/huginnindustries/codecartographer/defect-scan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,920 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 $0.00062 $0.01920
Opus 5.5 $0.00025 $0.00768
Sonnet 5.5 $0.00012 $0.00384
Haiku 4.5 $0.00006 $0.00192

Measured 1mo ago against content hash d65d6a154496, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

scan-for-defects 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 1mo 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.

.codecarto/findings/defect-scan/SKILL.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Scan For Defects

This phase runs six sequential analysis passes, each focused on one category of defect. Read and execute the passes in the order listed below. Do not try to cover all categories at once — complete each pass before starting the next.

The source code to analyze is in the parent directory (../ relative to .codecarto/). This is the repository root.

Prerequisites

Required: Read findings/architecture/architecture-map.md before starting. You need the layer map, public surfaces, and concurrency model to know where to focus.

Optional but valuable: If the following files exist, read them before starting passes 5 and 4 respectively. They provide the behavioral spec to compare code against:

  • findings/contracts/behavioral-contracts.md — enables spec-grounded analysis in passes 4 and 5.
  • findings/protocols/protocols-and-state.md — enables state machine violation detection in pass 5.

If these files do not exist, the passes still work — they fall back to comparing code against its own documentation (docstrings, type signatures, comments, README).

Pass Execution Order

Run these passes sequentially. Read the pass file, scan the source, record findings, then move to the next pass.

Pass File Focus
1 findings/defect-scan/passes/01-logic-and-correctness.md Dead code, boundary errors, null handling, boolean logic, control flow
2 findings/defect-scan/passes/02-error-handling.md Swallowed errors, missing cleanup, uncaught exceptions, retry gaps
3 findings/defect-scan/passes/03-concurrency-and-resources.md Race conditions, lock issues, async pitfalls, resource leaks
4 findings/defect-scan/passes/04-security-and-trust.md Input validation, auth gaps, secrets in code, trust boundaries
5 findings/defect-scan/passes/05-api-contract-violations.md Spec vs. implementation drift, return type mismatches, state machine violations
6 findings/defect-scan/passes/06-config-and-environment.md Hardcoded values, missing validation, dangerous defaults, OS assumptions

Read the full file on GitHub · 112 lines

Files

What ships with it

7 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. 1mo ago Changed · +10 lines d65d6a154496
  2. 1mo ago Changed · +14 lines 971343bde03c
  3. 1mo ago First seen · 88 lines · 62 tokens per session scan A 932483cbb97d

Subscribe to this mod's changes

scan-for-defects is a skill published in the GitHub repository HuginnIndustries/CodeCartographer (6 stars, last pushed 13d ago), licensed MIT. It adds 62 tokens to every session and 1,920 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 2026-08-31.

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