cratis-fundamentals-concept SKILL.md skillA
cratis-fundamentals-concept from cratis/ai is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cratis/ai/cratis-fundamentals-concept@git:20261015.37a28bfPins git:20261015.37a28bf in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cratis/ai
- Path
.cratis/ai/skills/cratis-fundamentals-concept/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261015.37a28bf, committed Oct 15, 2026
- First version recorded
- Oct 12, 2026
- Size
- 13,075 bytes
- Repository stars
- 4
- License
- MIT
Create strongly typed Cratis domain values with ConceptAs and Chronicle event-source identities with EventSourceId. Use when a C# or TypeScript domain value has meaning beyond its primitive or when an identity is actually used as a Chronicle event-source/stream ID. Do not use for enums, DTO-only transport values, arbitrary non-stream entity IDs, or event schema migration.
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
# Cratis domain concepts and event-source identities Replace a primitive only when the domain gives it distinct meaning. Keep value concepts and Chronicle stream identities separate. ## Verified product sources Sources: | Package | Purpose | | --- | --- | | `Cratis.Fundamentals` | `ConceptAs<T>`, `IGeneratable<TSelf>`, `IGeneratableInContext<TSelf>`, `GenerationContext` and `GenerateValue` | | `Cratis.Chronicle` | `Cratis.Chronicle.Events.EventSourceId` and `EventSourceId<T>` | | `@cratis/fundamentals` | TypeScript `ConceptAs<T>`, `field`, `Guid`, and JSON conversion | Reverify product sources before claiming support for another version. ## Choose the type - Derive a name, amount, code, number, or non-stream entity ID from `ConceptAs<T>`. - Derive an identity from `EventSourceId<T>` only when that value is actually passed to Chronicle as the event-source/stream ID. - Do not use `ConceptAs<Guid>` for a Chronicle stream identity. - Do not use `EventSourceId<T>` merely because a value is called an ID. - Do not wrap an enum. An enum already expresses a closed domain concept. - Keep DTO-only transport values primitive unless the domain type belongs in the public contract. …
Read the whole file at its exact version.
How to install
mdr add cratis/ai/cratis-fundamentals-concept@sha256:6f0cd4b3c686b4d8The line at the top of this page pins the label git:20261015.37a28bf, 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_cbf5ql56e7bifzh3)
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Versions
The registry has recorded 5 versions of this file, between Oct 12, 2026 and Oct 15, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261015.37a28bf latest | 2026-10-15 | 37a28bf | 13,075 B | A | view · diff |
| git:20261014.e378299 | 2026-10-14 | e378299 | 12,393 B | A | view · diff |
| git:20261013.d89a1b7 | 2026-10-13 | d89a1b7 | 12,364 B | A | view · diff |
| git:20261013.be93850 | 2026-10-13 | be93850 | 12,681 B | A | view · diff |
| git:20261012.4f7115e | 2026-10-12 | 4f7115e | 11,890 B | A | view |
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 (13075 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
cratis/ai · 4 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cbf5ql56e7bifzh3 GET https://markdownregistry.com/api/v1/resolve?ref=cratis/ai/cratis-fundamentals-concept GET https://markdownregistry.com/api/v1/blob/6f0cd4b3c686b4d873e2270616ff0ba199b2ce5e9e284ddebb0905c70f6d2d0b
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.