qcheckf

qcheckf is a skill for Claude Code, Codex from 3awny/qship. It costs 59 tokens per session (1,710 once invoked), scanned A, original, MIT.

A focused code-review method for examining one function in depth. It checks the function's inputs, output, edge cases, errors, side effects, and whether it has one clear responsibility.

In plain words
What is it for?
Use it to review a single changed function's types, parameters, error handling, hidden effects, and suitability for its callers rather than reviewing an entire codebase.
Why use it?
It catches contract and maintenance problems before they spread to callers, especially in exported functions, HTTP handlers, and complex or frequently used routines.

Skill for Claude CodeCodex

Part of the qship plugin — 22 skills, 1 agent, 1 hook 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/3awny/qship/qcheckf
Any agent
npx skills add 3awny/qship --skill qcheckf
Clone the repo
git clone --depth 1 https://github.com/3awny/qship

Made for: Claude Code, Codex.

Or install qship, the plugin that ships this one along with the rest of its 22 skills, 1 agent, 1 hook.

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 qcheckf

README.md
[![agentmods](https://agentmods.dev/badge/skills/3awny/qship/qcheckf.svg)](https://agentmods.dev/skills/3awny/qship/qcheckf)
Your own site
<a href="https://agentmods.dev/skills/3awny/qship/qcheckf"><img src="https://agentmods.dev/badge/skills/3awny/qship/qcheckf.svg" alt="Measured on agentmods" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,710 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 5.1 $0.00059 $0.01710
Opus 5 $0.00030 $0.00855
Sonnet 5 $0.00012 $0.00342
Haiku 4.5 $0.00006 $0.00171

Measured 5d ago against content hash dd99a273a4bc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

qcheckf 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 5d 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.

templates/skills/qcheckf/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Function Review

You are a skeptical senior engineer reviewing function-level changes — signatures, bodies, and the contract each function presents to its callers. The goal is to catch design issues before they propagate: wrong types, hidden side-effects, signatures that callers can misuse, error handling that masks bugs.

Scope

Default to the diff under review:

git diff develop...HEAD -- '**/*.py' '**/*.ts' '**/*.tsx'

For each function in the diff, classify it:

  • Public — exported, called from other modules, or reachable from an HTTP route. Contract matters most.
  • Private — module-internal helper. Implementation matters more than contract.

Apply the checks below per function. Don't grade pre-existing functions that the diff didn't substantively modify — out of scope.

Patterns to look for

For each finding, name the failure mode it produces — what bug or maintenance pain it causes. Without that, leave it alone.

1. Signature & types

  • Untyped parameters or return in Python or TypeScript. Especially load-bearing return types — -> dict or -> Any is rarely right.
  • Optional[X] where every caller passes a value — drop the Optional and the null check (cross-link to /qclean).
  • **kwargs for known parameters — memory: feedback_strong_typing. Forces callers and readers to read the body to know what's accepted.
  • str where an Enum exists — same memory entry. String params let callers pass typos that fail at runtime.
  • float for money — must be Decimal. Memory: feedback_decimal_not_float. This is a P0 in financial code.
  • Override doesn't match base signature — memory: feedback_override_must_match_base_signature. Subclass create() / update() dropping kwargs the base passes silently breaks the call site.
  • Boolean trap — 3+ boolean parameters. Callers can't read the call site (do_thing(True, False, True)). Refactor to a small dataclass / config or split the function.

2. FastAPI / endpoint specifics

Read the full file on GitHub · 120 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. 5d ago First seen · 120 lines · 59 tokens per session scan A dd99a273a4bc

Subscribe to this mod's changes

qcheckf is a skill published in the GitHub repository 3awny/qship (2 stars, last pushed 2mo ago), licensed MIT. It adds 59 tokens to every session and 1,710 once invoked, about $0.0003 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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