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.
npx skills add ArabelaTso/Skills-4-SE --skill edge-case-generatorgit clone --depth 1 https://github.com/ArabelaTso/Skills-4-SEWrote 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.
[](https://agentmods.dev/skills/arabelatso/skills-4-se/edge-case-generator)<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/edge-case-generator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/edge-case-generator/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.
<a href="https://agentmods.dev/skills/arabelatso/skills-4-se/edge-case-generator"><img src="https://agentmods.dev/badge/skills/arabelatso/skills-4-se/edge-case-generator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 362 Skill allows unbounded resource consumption (API calls, storage, compute). Without rate limits or quotas, a compromised or misbehaving agent can cause denial-of-service or cost overruns.Fix: Set explicit rate limits, timeouts, and resource quotas for API calls, file operations, and compute. Implement circuit breakers for runaway loops.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00082 | $0.04274 |
| Opus 5.5 | $0.00033 | $0.01710 |
| Sonnet 5.5 | $0.00016 | $0.00855 |
| Haiku 4.5 | $0.00008 | $0.00427 |
Grade A, and why
edge-case-generator 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.
How it starts
The opening of the file, as written. The whole thing — 671 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Edge Case Generator
Systematically identify boundary conditions, edge cases, and exceptional scenarios, then generate comprehensive tests to validate software behavior under uncommon conditions.
Core Capabilities
1. Edge Case Identification
Analyze code, specifications, or requirements to identify:
- Boundary values: Min/max limits, zero, empty, first/last elements
- Null and undefined: Missing data, null pointers, undefined references
- Type boundaries: Integer overflow, floating-point precision, type mismatches
- Collection edge cases: Empty collections, single element, duplicates
- State transitions: Invalid state sequences, concurrent modifications
- Resource limits: Memory exhaustion, timeout scenarios, disk full
- Special characters: Unicode, whitespace, control characters
- Concurrency issues: Race conditions, deadlocks, thread safety
2. Test Generation
Generate tests in multiple formats:
- Unit tests (pytest, Jest, JUnit, Go testing, etc.)
- Integration test scenarios
- Property-based tests (Hypothesis, QuickCheck, fast-check)
- Mutation testing scenarios
- Fuzz testing inputs
3. Multi-Language Support
Support major programming languages:
- Python, JavaScript/TypeScript, Java, C/C++, Go, Rust, C#, Ruby, PHP, Swift, Kotlin
Edge Case Analysis Workflow
Step 1: Identify Input Domains
Analyze each input parameter or data structure:
For numeric inputs:
- Minimum value (e.g., INT_MIN, 0, -∞)
- Maximum value (e.g., INT_MAX, 255, +∞)
- Zero
- One (unit value)
- Negative one
- Just below/above boundaries
- Overflow/underflow values
For collections (arrays, lists, sets):
- Empty collection
- Single element
- Two elements (minimal interaction)
- Maximum size (if bounded)
- All identical elements
- All unique elements
- Sorted vs unsorted
- Contains duplicates
For strings:
- Empty string ("")
- Single character
- Very long string (10K+ chars)
- Unicode characters (emoji, RTL, special)
- Whitespace only (" ")
- Null terminator issues
- Special characters (\n, \t, \0)
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 671 lines · 82 tokens per session scan A 97859a59537d
edge-case-generator is a skill published in the GitHub repository ArabelaTso/Skills-4-SE (259 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 82 tokens to every session and 4,274 once invoked, about $0.0003 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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