cratis-arc-query-typescript SKILL.md skillA
cratis-arc-query-typescript 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-arc-query-typescript@git:20261012.8a4854aPins git:20261012.8a4854a 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-arc-query-typescript/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261012.8a4854a, committed Oct 12, 2026
- First version recorded
- Sep 26, 2026
- Size
- 19,164 bytes
- Repository stars
- 4
- License
- MIT
Add a query to a Cratis Arc read model in a Node.js TypeScript server with Arc for TypeScript — the @readModel() class and its static @query() methods, argument/service/queryOptions binding with generated metadata or explicit descriptors, return shapes and absence, GET and the HTTP QUERY method, paging and sorting with queryPage, observable queries backed by RxJS BehaviorSubject/Subject/Observable over SSE and WebSocket, storage-backed queries through MongoDB, Drizzle or ChronicleReadModels…
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
# Add a query to an Arc read model in TypeScript (Node.js server) In Arc for TypeScript a read model is a decorated class, and its reads are **static** methods on it marked `@query()`. Each query becomes a route; Arc binds the arguments, resolves services, pages and sorts, and wraps every answer in the same `QueryResult` envelope. There is no controller to write. Arc for TypeScript is a **source preview**: `@cratis/arc.core` and the other server packages are not published to npm, and the API may change. `@cratis/arc` is the separate, published **client** that generated query proxies import in a frontend. Project setup, the builder, and hosts are in `cratis-arc-command-typescript`. ## Verified product sources Verified against `Cratis/Arc.TypeScript` tag **v0.57.2** (GitHub pre-release; server packages 0.57.2, not on npm), reading `Source/Core/queries/index.ts`, `Documentation/queries/**`, `Documentation/mongodb/**`, `Documentation/sql/**`, `Documentation/testing/queries.md` and `observable-queries.md`, and `Samples/Tasks` / `Samples/Library`. RxJS `^7.8.2` is an optional peer of `@cratis/arc.core`, required only for RxJS sources. ## Declare a read model and its queries …
Read the whole file at its exact version.
How to install
mdr add cratis/ai/cratis-arc-query-typescript@sha256:078ad2c3fdc86ce5The line at the top of this page pins the label git:20261012.8a4854a, 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_7ac5cswqluwagf5h)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 26, 2026 and Oct 12, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261012.8a4854a latest | 2026-10-12 | 8a4854a | 19,164 B | A | view · diff |
| git:20260926.ff6c0ff | 2026-09-26 | ff6c0ff | 17,242 B | A | view · diff |
| git:20260926.a5fc0fd | 2026-09-26 | a5fc0fd | 17,264 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 (19164 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_7ac5cswqluwagf5h GET https://markdownregistry.com/api/v1/resolve?ref=cratis/ai/cratis-arc-query-typescript GET https://markdownregistry.com/api/v1/blob/078ad2c3fdc86ce59883713c7d05a9b6700d155424700cdad6ec18293ec9dc61
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