start-middleware SKILL.md skillA
start-middleware 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-middleware@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-middleware/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.0, committed Sep 27, 2026
- First version recorded
- Jul 5, 2026
- Size
- 6,156 bytes
- Repository stars
- 36
- License
- MIT
Use when composing cross-cutting server logic in TanStack Start with createMiddleware — chaining, context, auth factories.
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 composing cross-cutting server logic in TanStack Start with createMiddleware: request middleware vs server-function middleware, chaining via .middleware([...]), sharing context with next({ context }), passing client-to-server context with sendContext, client-side middleware (.client()), global middleware declared via createStart in src/start.ts, parameterized authorization factories, and staticFunctionMiddleware ordering. Targets @tanstack/react-start v1.168.58.
Critical rules enforced: the method chain order is fixed (.middleware() → .validator() → .client() → .server()); shape-validated sendContext data is NOT authorization — always re-check access against the server-trusted session before using a client-sent value as a query key, filter, or path param; client context is never sent to the server unless explicitly opted in, and the client can lie about anything it sends; .client() runs on the server during SSR, so browser-only APIs need a typeof window guard; and staticFunctionMiddleware must always be last in the chain.
Includes templates for an auth + permission-based authorization factory and for client-side middleware (headers, custom fetch, telemetry).
…Read the whole file at its exact version.
How to install
mdr add fusengine/agents/start-middleware@sha256:ad02748d08c43a5dThe 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_e4bf3inlz4jppdxu)
3 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 | 6,156 B | A | view · diff |
| v1.0.0 | 2026-07-29 | 3b91eed | 6,154 B | A | view · diff |
| v1.0.0 | 2026-07-05 | 8c2f9bc | 5,198 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 (6156 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_e4bf3inlz4jppdxu GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/agents/start-middleware GET https://markdownregistry.com/api/v1/blob/ad02748d08c43a5df944fdd51b19c8a0ae10f9aaaffdf6821fb7f29c1db31a43
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.