edge-case-mapper

edge-case-mapper is a skill for Claude Code, Codex from staruhub/CrewClaw. It costs 22 tokens per session (220 once invoked), scanned A, original, Apache-2.0.

A skill for mapping unusual situations, failures, and exception paths in a product requirement.

In plain words
What is it for?
Use it to turn overlooked cases into acceptance criteria and identify who owns important operational failures.
Why use it?
It exposes what should happen when the normal journey encounters empty data, errors, permissions, duplicates, abuse, retries, or rollbacks.

Skill for Claude CodeCodex

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/staruhub/crewclaw/edge-case-mapper
Any agent
npx skills add staruhub/CrewClaw --skill edge-case-mapper
Clone the repo
git clone --depth 1 https://github.com/staruhub/CrewClaw

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 edge-case-mapper

README.md
[![agentmods](https://agentmods.dev/badge/skills/staruhub/crewclaw/edge-case-mapper.svg)](https://agentmods.dev/skills/staruhub/crewclaw/edge-case-mapper)
Your own site
<a href="https://agentmods.dev/skills/staruhub/crewclaw/edge-case-mapper"><img src="https://agentmods.dev/badge/skills/staruhub/crewclaw/edge-case-mapper.svg" alt="Measured on agentmods" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 220 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 $0.00022 $0.00220
Opus 5 $0.00011 $0.00110
Sonnet 5 $0.00004 $0.00044
Haiku 4.5 $0.00002 $0.00022

Measured 5d ago against content hash 2d2fde884736, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

edge-case-mapper 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.

experts/product-prd-crab/skills/product/edge-case-mapper/SKILL.md · 38 lines

What it actually says

Edge Case Mapper

Overview

Make hidden product paths visible before implementation.

When to Use

Use when a requirement has a happy path but missing error, empty, permission, retry, or boundary states.

Workflow

  1. Map the main user journey.
  2. Add empty, loading, error, and permission states.
  3. Add abuse, duplicate, and rollback cases.
  4. Identify operational ownership.
  5. Convert important cases into acceptance criteria.

Common Pitfalls

  • Do not list impossible edge cases just to look thorough.
  • Do not ignore privacy or permission states.
  • Do not mix implementation details with user-visible behavior.

Verification Checklist

  • Core journey and failure paths are covered.
  • Edge cases are tied to acceptance criteria.
  • High-risk unknowns are called out.
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 · 38 lines · 22 tokens per session scan A 2d2fde884736

Subscribe to this mod's changes

edge-case-mapper is a skill published in the GitHub repository staruhub/CrewClaw (22 stars, last pushed 6d ago), licensed Apache-2.0. It adds 22 tokens to every session and 220 once invoked, about $0.0001 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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