# Study Design Tool Gate

> Classify a paper's study design (RCT, cohort, case-control, diagnostic-accuracy, systematic-review, animal-study, prediction-model, etc., or not_applicable) and dispatch to the correct downstream bias-risk/quality/reporting tool and specific variant (CASP has 8 variants, JBI ~6, RoB2 has parallel/cluster/crossover versions). Use this as the mandatory first step before running ANY of CASP, JBI, AMSTAR-2, NOS, RoB2, ROBINS-I, QUADAS-2, CONSORT, STROBE, ARRIVE, SPIRIT, TRIPOD, or engineering-config-grading — these tools are all study-design-conditional and picking the wrong variant produces meaningless results. It is entirely correct and common for this gate to determine that none of these medically-descended tools applies (e.g. most CS/ML papers) — that is a valid, complete answer, not a failure.

- Skill: `yogsoth-ai/study-design-tool-gate` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add yogsoth-ai/study-design-tool-gate`
- Raw SKILL.md: https://api.skillmd.com/api/skills/yogsoth-ai/study-design-tool-gate/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: yogsoth-ai (https://skillmd.com/u/yogsoth-ai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/yogsoth-ai/study-design-tool-gate

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# Study Design Tool Gate

Classifies study design and dispatches to the right bias-risk/quality/reporting tool + variant — or determines none applies. Added per coverage-audit M11: the original graph had no node representing this dispatch decision at all; every A1/A2 tool was drawn as if it started with no gate.

## Execution

Subagent — spawned via spawn-agent skill.

## Reference

`references/tool-dispatch-table.md` — the full dispatch table (every study_design → tool + variant mapping). Read before drafting the prompt's decision, not summarized inline here (kept out of this SKILL.md body per Progressive Disclosure).

## "not_applicable" Is a Correct, Common Answer

This is worth restating: most of these tools carry medical/clinical assumptions baked into their domains, and forcing a dispatch onto a paper that has no matching study design produces a meaningless result, not a conservative one. Do not treat a high not_applicable rate across a batch of CS/ML papers as a sign this SOP is failing to trigger correctly.

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## Available SOPs

| SOP | When to use |
| --- | --- |
| spawn-agent | Spawn a customized CC subagent with full MCP tool access. |

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