complexity-check

A code-review check that measures cyclomatic complexity, meaning how many independent paths a function can take, in changed code.

In plain words
What is it for?
Use it to review branch diffs and find functions that may need simpler control flow, with file names, lines, measurements, thresholds, and an overall result.
Why use it?
It shows which functions exceed configured warning or rejection limits and whether the change made complexity worse than the base version.

Skill for Claude CodeCodex

Part of the slopstop plugin — 19 skills, 5 agents shipped together

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/iansmith/slopstop/complexity-check
Any agent
npx skills add iansmith/slopstop --skill complexity-check
Clone the repo
git clone --depth 1 https://github.com/iansmith/slopstop

Made for: Claude Code, Codex.

Or install slopstop, the plugin that ships this one along with the rest of its 19 skills, 5 agents.

Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,187 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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 $0.00081 $0.06187
Opus 5 $0.00041 $0.03093
Sonnet 5 $0.00016 $0.01237
Haiku 4.5 $0.00008 $0.00619

Measured 2d ago against content hash d4a3cec6843e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

complexity-check scanned grade C with 1 finding 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

git worktree remove --force "$BASE_WT" 2>/dev/null || rm -rf "$BASE_WT"
skills/complexity-check/SKILL.md · 401 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 401 lines · 81 tokens per session scan C d4a3cec6843e

Subscribe to this mod's changes

complexity-check is a skill published in the GitHub repository iansmith/slopstop (2 stars, last pushed 3d ago), with no licence file. It adds 81 tokens to every session and 6,187 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.