method-cohort SKILL.md skillA
method-cohort from sajor2000/methodsmith is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sajor2000/methodsmith/method-cohort@git:20261016.73e5a37Pins git:20261016.73e5a37 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sajor2000/methodsmith
- Path
plugins/methodsmith/skills/method-cohort/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261016.73e5a37, committed Oct 16, 2026
- Size
- 13,835 bytes
- Repository stars
- 3
- License
- MIT
Defines a reproducible study cohort: inclusion/exclusion, index event, pinned concepts, SQL, waterfall counts. Use when an EHR, OMOP, claims, or phenotype cohort is needed.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cohort Definition Builder ## Skill Value - **Problem it solves:** Cohort definitions are a common source of irrecoverable bias when criteria, timing, and code lists are implicit. - **Use when:** The user needs an EHR, OMOP, claims, phenotype, or observational-study cohort before data QA or SAP finalization. - **Output:** Cohort spec YAML, concept-set files or code lists, SQL/CTE query, and CONSORT-style waterfall counts. - **Ask only if:** Only for cohort facts not supplied by PICO, prior research-question YAML, data source, or user prompt. - **Do not do:** Do not run downstream modeling or pretend a vague population is a locked cohort. - **Interaction:** Check repo/config/chat evidence first. Ask one decision-changing question at a time; use the current harness's blocking question UI when available, otherwise present numbered choices and wait. Walks the user through defining a research cohort with vocabulary-pinned concept sets and an explicit index event. Cohort definition is the most common source of unrecoverable bias in observational research; this skill makes the definition explicit, version-controlled, and replayable. ## When this skill activates …
Read the whole file at its exact version.
How to install
mdr add sajor2000/methodsmith/method-cohort@sha256:a574ff56006a075cThe line at the top of this page pins the label git:20261016.73e5a37, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_rp37jd7go373b22v)
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Versions
The registry has recorded 1 version of this file, committed on Oct 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13835 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sajor2000/methodsmith · 3 stars · license MIT · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rp37jd7go373b22v GET https://markdownregistry.com/api/v1/resolve?ref=sajor2000/methodsmith/method-cohort GET https://markdownregistry.com/api/v1/blob/a574ff56006a075cd7611c827ae0490bfa636e1edb05263a6111e4b37eb09eef
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.