SKILL.md SKILL.md skillC
SKILL.md from gossamer-lang/gossamer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add gossamer-lang/gossamer/SKILL.md@git:20261016.0fb4f89Pins git:20261016.0fb4f89 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- C, 14 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- gossamer-lang/gossamer
- Path
SKILL.md- Versions recorded
- 27
- Latest version
- git:20261016.0fb4f89, committed Oct 16, 2026
- First version recorded
- Aug 29, 2026
- Size
- 22,659 bytes
- Repository stars
- 188
- License
- Apache-2.0
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
# Gossamer - Skill Card
Drop this file into a model's context to teach it idiomatic Gossamer. For
anything not covered here, ask the toolchain (section 2) instead of guessing.
## 1. What Gossamer is
A fast-compiling language with deterministic memory management (reference
counting, cycle collection, `arena { }` regions - no borrow checker, no
lifetimes, no GC pauses). Syntax is Rust-flavoured; the runtime is Go-shaped
(goroutines, channels). Files end in `.gos`, the toolchain is `gos`, and a
project carries a `project.toml`. Programs run on the bytecode VM and JIT
(`gos run`) and as native binaries (`gos build`), with the same output on
every tier; `gos feature-status` says which surface is settled.
## 2. Lean on the toolchain
- `gos mcp` (e.g. `claude mcp add gossamer -- gos mcp`) exposes `check`,
`execute`, `build`, `test`, `fmt`, `doc`, `explain`, `lint`,
`feature_status`, and navigation (`hover`, `definition`, `references`,
`workspace_symbols`). `check`, `execute`, `fmt`, `doc`, and `lint` take an
inline `source` string. Use `hover` for "what is this", `explain CODE` for
any diagnostic, `doc` for a module's exports. This card is its
…Read the whole file at its exact version.
How to install
mdr add gossamer-lang/gossamer/SKILL.md@sha256:ef87dfd6d65bd8adThe line at the top of this page pins the label git:20261016.0fb4f89, 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_culq3ie5bns2gj3b)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 27 versions of this file, between Aug 29, 2026 and Oct 16, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261016.0fb4f89 latest | 2026-10-16 | 0fb4f89 | 22,659 B | C | view · diff |
| git:20261008.a3bc32d | 2026-10-08 | a3bc32d | 21,989 B | C | view · diff |
| git:20261007.a9d18e8 | 2026-10-07 | a9d18e8 | 21,883 B | C | view · diff |
| git:20261007.6e63371 | 2026-10-07 | 6e63371 | 21,825 B | C | view · diff |
| git:20261006.d204621 | 2026-10-06 | d204621 | 21,394 B | C | view · diff |
| git:20261005.914f384 | 2026-10-05 | 914f384 | 20,887 B | C | view · diff |
| git:20261005.e523a7b | 2026-10-05 | e523a7b | 19,773 B | C | view · diff |
| git:20261004.5d629c0 | 2026-10-04 | 5d629c0 | 19,704 B | C | view · diff |
| git:20261002.e0c05b1 | 2026-10-02 | e0c05b1 | 18,227 B | C | view · diff |
| git:20260930.b3b3f9e | 2026-09-30 | b3b3f9e | 17,991 B | C | view · diff |
| git:20260929.2eeabaa | 2026-09-29 | 2eeabaa | 60,192 B | C | view · diff |
| git:20260926.fd24396 | 2026-09-26 | fd24396 | 60,112 B | C | view · diff |
| git:20260924.f6e783d | 2026-09-24 | f6e783d | 59,369 B | C | view · diff |
| git:20260924.826ee60 | 2026-09-24 | 826ee60 | 59,397 B | C | view · diff |
| git:20260922.3cb086d | 2026-09-22 | 3cb086d | 59,398 B | C | view · diff |
| git:20260922.7b7caf9 | 2026-09-22 | 7b7caf9 | 59,390 B | C | view · diff |
| git:20260921.2e7a08e | 2026-09-21 | 2e7a08e | 59,039 B | C | view · diff |
| git:20260919.6a7e0d6 | 2026-09-19 | 6a7e0d6 | 58,879 B | C | view · diff |
| git:20260918.8cd95e9 | 2026-09-18 | 8cd95e9 | 57,805 B | C | view · diff |
| git:20260917.3db6086 | 2026-09-17 | 3db6086 | 56,711 B | C | view · diff |
| git:20260915.d5a2ee9 | 2026-09-15 | d5a2ee9 | 55,753 B | C | view · diff |
| git:20260910.b24cb61 | 2026-09-10 | b24cb61 | 54,366 B | C | view · diff |
| git:20260904.4a22319 | 2026-09-04 | 4a22319 | 54,270 B | C | view · diff |
| git:20260830.74e74cc | 2026-08-30 | 74e74cc | 53,512 B | C | view · diff |
| git:20260830.4231c24 | 2026-08-30 | 4231c24 | 53,362 B | C | view · diff |
| git:20260829.b66e65e | 2026-08-29 | b66e65e | 53,140 B | C | view · diff |
| git:20260829.0caf755 | 2026-08-29 | 0caf755 | 52,981 B | C | view |
Audit of the latest version
- fail: Frontmatter block present
- fail: Frontmatter declares a name
- fail: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (22659 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
gossamer-lang/gossamer · 188 stars · license Apache-2.0 · pushed 2026-10-16 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_culq3ie5bns2gj3b GET https://markdownregistry.com/api/v1/resolve?ref=gossamer-lang/gossamer/SKILL.md GET https://markdownregistry.com/api/v1/blob/ef87dfd6d65bd8adad01d2c0b74e03f2ba993b032585048cfb6bc76ed4d9384e
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.
More from gossamer-lang/gossamer
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