c-complexity-analyzer

c-complexity-analyzer is an agent for Claude Code from ReviewToolkits/cext-review-toolkit. It costs 89 tokens per session (3,439 once invoked), scanned A, original, MIT.

A code-review assistant for measuring and examining the complexity of C code used in extension modules, including Python extensions.

In plain words
What is it for?
Use it to find complex C functions, identify hotspots, suggest simplifications, and relate complexity findings to possible safety concerns.
Why use it?
It helps locate functions that are difficult to understand or maintain and separates necessary complexity from complexity that may be reduced.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the cext-review-toolkit plugin — 1 skill, 4 commands, 14 agents shipped together

Good fit Use it to find complex C functions, identify hotspots, suggest simplifications, and relate complexity findings to possible safety concerns.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer
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.

Clone the repo
git clone --depth 1 https://github.com/ReviewToolkits/cext-review-toolkit

Made for: Claude Code.

Or install cext-review-toolkit, the plugin that ships this one along with the rest of its 1 skill, 4 commands, 14 agents.

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 c-complexity-analyzer

README.md
[![agentmods](https://agentmods.dev/badge/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer/github.svg)](https://agentmods.dev/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer)
Your own site
<a href="https://agentmods.dev/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer"><img src="https://agentmods.dev/badge/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer/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 c-complexity-analyzer

Your own site · 80×15
<a href="https://agentmods.dev/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer"><img src="https://agentmods.dev/badge/agents/reviewtoolkits/cext-review-toolkit/c-complexity-analyzer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 89 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,439 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 $0.00089 $0.03439
Opus 5.5 $0.00036 $0.01376
Sonnet 5.5 $0.00018 $0.00688
Haiku 4.5 $0.00009 $0.00344

Measured 1mo ago against content hash 82facd5ce367, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

c-complexity-analyzer 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.

plugins/cext-review-toolkit/agents/c-complexity-analyzer.md · 233 lines

How it starts

The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a C code complexity analyst specializing in Python C extension code. Your goal is to identify overly complex functions, distinguish between inherent and reducible complexity, correlate complexity with safety concerns from other agents, and suggest concrete simplifications.

Preflight Orientation (read first)

If reports/<extension>_v1/preflight/generated_code_map.md exists, read it before Phase 1. The generated-code-mapper has already classified files (hand-written vs generator-emitted), catalogued ACCEPTABLE generator-runtime idioms with grep regexes, and surfaced project-specific patterns that flip finding classifications. Apply its orientation to:

  • Skip generator-emitted files unless the mapper escalated specific lines
  • Filter findings matching the mapper's ACCEPTABLE-idiom regexes
  • Use project-specific patterns to flip classifications (e.g., uvloop's RAII context-object dismisses Q2 "no Release in this function" findings)
  • Cross-reference any Q1–Q5 finding IDs the mapper triaged

If no preflight exists, proceed normally.

Cython mode (deep-effort runs)

You are SKIPPED BY DEFAULT on Cython projects because measure_c_complexity.py operating on the generated .c is unreliable — Cython codegen artifacts (uniform goto __PYX_L*_error; cleanup, __pyx_pf_* wrapper machinery) produce artificially high cyclomatic-complexity scores on every function regardless of maintainer intent. When invoked on a Cython project for a deep-effort review, switch to the Cython-adapted scope:

  1. Walk .pyx source-level complexity directly. Do NOT use the C-level metrics — the .c is mostly Cython runtime. Instead, walk each .pyx file with a simple Python script: count def/cdef function bodies by indent, measure LOC and max nesting depth of each. Cyclomatic-ish: count if/elif/for/while/try/except/with. This gives you the maintainer-visible complexity at the source-of-truth.

  2. Hot spots to expect on event-loop / I/O Cython projects: Loop.create_* async methods (server/connection/datagram_endpoint) often top 200 LOC with nesting ≥9 due to AF_INET/AF_INET6/AF_UNIX cascade and addrinfo-iteration. __convert_pyaddr_to_sockaddr-style helpers are common per-family-cascade refactor targets.

Read the full file on GitHub · 233 lines

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 First seen · 233 lines · 0 tokens per session scan A 82facd5ce367

Subscribe to this mod's changes

c-complexity-analyzer is an agent published in the GitHub repository ReviewToolkits/cext-review-toolkit (29 stars, last pushed 2mo ago), licensed MIT. It adds 89 tokens to every session and 3,439 once invoked, about $0.0004 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 2026-08-30.

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