add-language-feature SKILL.md skillA
add-language-feature from ymm-oss/fsl is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ymm-oss/fsl/add-language-feature@git:20260929.d8a8accPins git:20260929.d8a8acc in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ymm-oss/fsl
- Path
.claude/skills/add-language-feature/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260929.d8a8acc, committed Sep 29, 2026
- First version recorded
- Jul 3, 2026
- Size
- 2,317 bytes
- Repository stars
- 37
- License
- Apache-2.0
Scaffold and verify a new native Rust FSL language feature while keeping syntax, lowering, symbolic/concrete semantics, docs, skill reference, tests, and changelog coupled.
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 native FSL language feature The Rust workspace is authoritative. Before editing, classify the feature as surface-only lowering, typed Kernel behavior, evaluator semantics, CLI/report behavior, or public Kernel contract. ## Coupled checklist - `rust/fsl-syntax`: tokens, parsing, AST, and locations when syntax changes. - `rust/fsl-core`: validation, types, name resolution, dialect lowering, and Kernel projection. - `rust/fsl-runtime`: concrete Monitor/BFS behavior for evaluable semantics. - `rust/fsl-verifier`: symbolic BMC/induction/refinement/liveness behavior. - `rust/fsl-tools` or `rust/fslc`: report/command/envelope behavior when applicable. - `rust/fsl-wasm`: only when Worker-visible behavior or shared envelopes require it. - Focused positive, negative, and boundary regression evidence. - `docs/manual/LANGUAGE.md`, `docs/manual/LANGUAGE.ja.md`, `skills/fsl/references/`, relevant `docs/design/DESIGN-*.md`, docs map, and a new `changelog.d/<id>-<slug>.<category>.md` fragment (see `changelog.d/README.md`) -- not a direct `CHANGELOG.md` edit. - A new declaration, binder, or reference form: `rust/fsl-lsp/src/index.rs` and a targeted role/scope test. …
Read the whole file at its exact version.
How to install
mdr add ymm-oss/fsl/add-language-feature@sha256:1d5355062dc7e71fThe line at the top of this page pins the label git:20260929.d8a8acc, 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_uc2fq4szeetw3kqg)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Jul 3, 2026 and Sep 29, 2026, about one every 18 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260929.d8a8acc latest | 2026-09-29 | d8a8acc | 2,317 B | A | view · diff |
| git:20260901.2ed7eba | 2026-09-01 | 2ed7eba | 2,296 B | A | view · diff |
| git:20260828.927728f | 2026-08-28 | 927728f | 2,163 B | A | view · diff |
| git:20260808.b470535 | 2026-08-08 | b470535 | 2,164 B | A | view · diff |
| git:20260713.90c0e23 | 2026-07-13 | 90c0e23 | 2,071 B | A | view · diff |
| git:20260703.bdabb9b | 2026-07-03 | bdabb9b | 3,590 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 (2317 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 · 37 stars · license Apache-2.0 · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uc2fq4szeetw3kqg GET https://markdownregistry.com/api/v1/resolve?ref=ymm-oss/fsl/add-language-feature GET https://markdownregistry.com/api/v1/blob/1d5355062dc7e71fcd97f36521cb1b79dc319e743b8eb9a2ae80d5683854c790
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.