fsl-from-code skillA
fsl-from-code is agent-read markdown (skill) from ymm-oss/fsl: Reverse-engineer an FSL design-layer spec from existing source code. Scope the stateful subsystem, harvest state/actions/guards/effects with source-line witnesses, surface invariants and forbidden flows as confirmation questions (never fabricated), then verify, mutation-test for hollowness, and prove conformance by replaying the generated harness against the real code. Use when the input is code and the deliverable is a spec. Do not use when starting from a requirements contract (use fsl-design).
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
How to install
mdr add ymm-oss/fsl/fsl-from-code@git:20260828.927728fmdr add ymm-oss/fsl/fsl-from-code@sha256:86372d597fd2dee1Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_hv6vt4j737yhcjny)
0 badge views in 30 days
Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260828.927728f latest | 2026-08-28 | 927728f | 9,970 B | A | view · diff |
| git:20260706.7fb3417 | 2026-07-06 | 7fb3417 | 9,951 B | A | view · diff |
| git:20260626.58f2f6b | 2026-06-26 | 58f2f6b | 9,693 B | A | view · diff |
| git:20260625.46b8074 | 2026-06-25 | 46b8074 | 9,492 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 (9970 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
ymm-oss/fsl · 26 stars · license Apache-2.0 · pushed 2026-09-17 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hv6vt4j737yhcjny GET https://markdownregistry.com/api/v1/resolve?ref=ymm-oss/fsl/fsl-from-code GET https://markdownregistry.com/api/v1/blob/86372d597fd2dee13c05d64ee59dbe3fca76c14b854eae1ded28cce9f02ecb72
Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.