a-stated-rule-needs-annotated-exceptions

a-stated-rule-needs-annotated-exceptions is a skill for Claude Code from maxrave-dev/kotlin-footguns. It costs 117 tokens per session (1,293 once invoked), scanned A, original, GPL-3.0.

A software-design guideline for rules that have valid exceptions. It requires each exception to state its reason where it is used and keeps the main rule easy to find in the code.

In plain words
What is it for?
Use it when defining codebase rules, reviewing exceptions, and auditing whether exceptions are documented and limited to the intended scope.
Why use it?
Without a recorded reason, an exception can look like a mistake and gradually weaken the rule.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the kotlin-footguns plugin — 148 skills shipped together

Good fit Use it when defining codebase rules, reviewing exceptions, and auditing whether exceptions are documented and limited to the intended scope.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions
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 maxrave-dev/kotlin-footguns --skill a-stated-rule-needs-annotated-exceptions
Clone the repo
git clone --depth 1 https://github.com/maxrave-dev/kotlin-footguns

Made for: Claude Code.

Or install kotlin-footguns, the plugin that ships this one along with the rest of its 148 skills.

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 a-stated-rule-needs-annotated-exceptions

README.md
[![agentmods](https://agentmods.dev/badge/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions/github.svg)](https://agentmods.dev/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions)
Your own site
<a href="https://agentmods.dev/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions"><img src="https://agentmods.dev/badge/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions/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 a-stated-rule-needs-annotated-exceptions

Your own site · 80×15
<a href="https://agentmods.dev/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions"><img src="https://agentmods.dev/badge/skills/maxrave-dev/kotlin-footguns/a-stated-rule-needs-annotated-exceptions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 117 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,293 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 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 5.1 $0.00117 $0.01293
Opus 5 $0.00059 $0.00647
Sonnet 5 $0.00023 $0.00259
Haiku 4.5 $0.00012 $0.00129

Measured 9d ago against content hash ae197e99aaeb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

a-stated-rule-needs-annotated-exceptions 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 9d 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.

skills/a-stated-rule-needs-annotated-exceptions/SKILL.md · 92 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 9d ago First seen · 92 lines · 117 tokens per session scan A ae197e99aaeb

Subscribe to this mod's changes

a-stated-rule-needs-annotated-exceptions is a skill published in the GitHub repository maxrave-dev/kotlin-footguns (100 stars, last pushed 10d ago), licensed GPL-3.0. It adds 117 tokens to every session and 1,293 once invoked, about $0.0006 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 2026-08-30.

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