edgecase-enumeration

edgecase-enumeration is a skill for Claude Code, Codex from s977043/PlanGate. It costs 83 tokens per session (409 once invoked), scanned A, original, MIT.

A systematic list of boundary cases and unusual situations a feature may encounter. It covers inputs, failures, timeouts, retries, and simultaneous actions.

In plain words
What is it for?
Use it to consider empty or invalid input, minimum and maximum values, partial success, competing requests, and validation failures.
Why use it?
It helps prevent missing failure paths when defining requirements and planning tests.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents); mentions Codex.

Good fit Use it to consider empty or invalid input, minimum and maximum values, partial success, competing requests, and validation failures.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/s977043/plangate/edgecase-enumeration
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 s977043/PlanGate --skill edgecase-enumeration
Clone the repo
git clone --depth 1 https://github.com/s977043/PlanGate

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 edgecase-enumeration

README.md
[![agentmods](https://agentmods.dev/badge/skills/s977043/plangate/edgecase-enumeration.svg)](https://agentmods.dev/skills/s977043/plangate/edgecase-enumeration)
Your own site
<a href="https://agentmods.dev/skills/s977043/plangate/edgecase-enumeration"><img src="https://agentmods.dev/badge/skills/s977043/plangate/edgecase-enumeration.svg" alt="Measured on agentmods" height="20"></a>
Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 409 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 $0.00083 $0.00409
Opus 5 $0.00042 $0.00204
Sonnet 5 $0.00017 $0.00082
Haiku 4.5 $0.00008 $0.00041

Measured 7d ago against content hash 536206b7d624, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

edgecase-enumeration 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 7d 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.

.agents/skills/edgecase-enumeration/SKILL.md · 43 lines

What it actually says

Edgecase Enumeration

入力の境界値、例外パス、異常系、競合条件などを体系的に列挙する Skill。

カテゴリ

Check

想定 Phase

WF-02 Requirement Expansion

入力

  • requirements(機能要件 / 非機能要件)
  • 対象のデータ型 / API 仕様 / ユーザー操作フロー

出力

エッジケース一覧:

  • 境界値(0 / 最小 / 最大 / オーバーフロー)
  • null / 空 / 未定義の扱い
  • タイムアウト / 再送 / 部分成功
  • 並行アクセス / 競合条件
  • 不正な入力 / バリデーション失敗

使い方

  • WF-02 で qa-reviewer が呼び出す
  • 結果は acceptance-criteria-build とテスト観点設計の入力になる

関連

  • Workflow: docs/workflows/02_requirement_expansion.md配布対象外install.sh --claude / plugin / Codex の 3 経路とも導入先には配置されない。解決できない場合は本 Skill の記述を代替正本とし、「正本 <path> を参照できなかった」と明示する)
  • 連携 Skill: acceptance-criteria-build
  • Rule: Rule 2
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. 7d ago First seen · 43 lines · 83 tokens per session scan A 536206b7d624

Subscribe to this mod's changes

edgecase-enumeration is a skill published in the GitHub repository s977043/PlanGate (2 stars, last pushed yesterday), licensed MIT. It adds 83 tokens to every session and 409 once invoked, about $0.0004 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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