start-server-functions SKILL.md skillA
start-server-functions from fusengine/agents is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add fusengine/agents/start-server-functions@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fusengine/agents
- Path
plugins/tanstack-start-expert/skills/start-server-functions/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.0, committed Sep 27, 2026
- First version recorded
- Jul 5, 2026
- Size
- 6,363 bytes
- Repository stars
- 36
- License
- MIT
Use when creating type-safe RPC server logic with createServerFn — validators, handlers, FormData, redirects. Do NOT use for raw HTTP endpoints or middleware chains.
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
<objective>
Covers createServerFn, TanStack Start's same-origin type-safe RPC mechanism: GET/POST methods, .validator() (Zod or a plain function), .handler(), the useServerFn hook, FormData input, Response output, strict serialization, throwing redirect()/notFound(), server context utilities, and CSRF protection. Server functions run only on the server but are callable from loaders, components, hooks, and other server functions. Targets @tanstack/react-start v1.168.58.
Critical rules: a server function is an independent HTTP endpoint reachable directly, so a route's beforeLoad redirect protects the UI only — auth must live inside the handler or its middleware for every function touching private data; never use Next.js/Remix patterns ("use server", getServerSideProps, Remix loader/action); loaders are isomorphic, so DB/secrets/filesystem access belongs in a server function, never a loader; useServerFn is mandatory when a function throws redirect() or notFound() (optional otherwise); and strict serialization is on by default (FormData allowed as POST input, Response as output).
Includes templates for a full CRUD module and for FormData submissions with Zod validation.
…Read the whole file at its exact version.
How to install
mdr add fusengine/agents/start-server-functions@sha256:85343395a3749851The line at the top of this page pins the label v1.0.0, 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_rhentdg3zrppb36t)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 5, 2026 and Sep 27, 2026, about one every 42 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-27 | 43a351c | 6,363 B | A | view · diff |
| v1.0.0 | 2026-07-29 | 3b91eed | 6,361 B | A | view · diff |
| v1.0.0 | 2026-07-05 | 8c2f9bc | 5,278 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 (6363 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
fusengine/agents · 36 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rhentdg3zrppb36t GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/agents/start-server-functions GET https://markdownregistry.com/api/v1/blob/85343395a3749851d9776ce96d18cfed358576f29c7e19f969fbb94cfcc16ab1
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.