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 yogsoth-ai/stress-test --skill critical-case-designgit clone --depth 1 https://github.com/yogsoth-ai/stress-testWrote 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/yogsoth-ai/stress-test/critical-case-design)<a href="https://agentmods.dev/skills/yogsoth-ai/stress-test/critical-case-design"><img src="https://agentmods.dev/badge/skills/yogsoth-ai/stress-test/critical-case-design/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/yogsoth-ai/stress-test/critical-case-design"><img src="https://agentmods.dev/badge/skills/yogsoth-ai/stress-test/critical-case-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00029 | $0.00581 |
| Opus 5 | $0.00015 | $0.00291 |
| Sonnet 5 | $0.00006 | $0.00116 |
| Haiku 4.5 | $0.00003 | $0.00058 |
Grade A, and why
critical-case-design 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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Critical Case Design
Tactics
- boundary-probing
- counterexample-heuristics
Method
- Identify the claim's scope and conditions
- Design most-likely case: conditions maximally favorable to claim
- Design least-likely case: conditions maximally unfavorable
- If claim fails in most-likely case: strong disconfirmation
- If claim holds in least-likely case: strong confirmation
- Report inferential power of each test
Budget
| Size | Critical cases designed | Evaluation depth |
|---|---|---|
| S | 2 (one most-likely, one least-likely) | Surface |
| M | 4 (two each) | Moderate |
| L | 6 (three each) | Deep |
Orchestration
- Dispatch
parameter-space-mappingto identify conditions - Dispatch
extreme-value-generationfor favorable/unfavorable extremes - Dispatch
breakpoint-detectionto test claim at critical cases - Dispatch
contradiction-detectionto evaluate outcomes
Subagents
- parameter-space-mapping
- extreme-value-generation
- breakpoint-detection
- contradiction-detection
Available Tactics
Optional, no fixed order; the final leaf is always a sop.
| Tactic | When to use |
|---|---|
| boundary-probing | Map parameter space, generate extreme values, test at boundaries, detect breakpoints, synthesize validity envelope. |
| counterexample-heuristics | Generate counterexamples (monsters), attempt monster-barring, incorporate surviving counterexamples as lemma refinements (Lakatos method). |
Available SOPs
Optional, no fixed order; the final leaf is always a sop.
| SOP | When to use |
|---|---|
| breakpoint-detection | Test a claim at extreme parameter values and detect the precise point where it breaks down. |
| contradiction-detection | Evaluate whether a derivation chain has reached a genuine contradiction, absurdity, or inconclusive state. |
| extreme-value-generation | Generate boundary and extreme test values for a given parameter dimension to stress-test claims. |
| parameter-space-mapping | Identify all parameter dimensions along which a claim's validity might vary. |
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.
- 9d ago First seen · 78 lines · 29 tokens per session scan A 3337cd5b8ab1
critical-case-design is a skill published in the GitHub repository yogsoth-ai/stress-test (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 581 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 2026-08-31.
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