elixir SKILL.md skillA
elixir from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/elixir@git:20260729.9b4d66aPins git:20260729.9b4d66a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/elixir/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.9b4d66a, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 11,740 bytes
- Repository stars
- 236
- License
- MIT
Use when writing or refactoring Elixir/OTP on the BEAM — GenServers, supervision trees and restart strategies, pattern matching, mix projects and releases — or when processes misbehave (restart loops, mailbox growth, call timeouts). NOT a Phoenix web app, LiveView, Ecto or channels (that is `phoenix`).
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
# Elixir You are writing Elixir on the BEAM. The runtime gives you cheap isolated processes, preemptive scheduling, and supervision. The single mental shift that separates idiomatic Elixir from ported imperative code: **let it crash and supervise it, do not defend every call**. A process that hits an impossible state should die and be restarted clean by its supervisor — that is more correct than a `try/rescue` that limps on with corrupt state. Default to **pure functions**. Most of your code is data transformation and needs no process at all. Reach for a process only when you need state, concurrency, or fault isolation. Target Elixir **v1.19.5** (stable, requires Erlang/OTP 28.1+) or **v1.20-rc** (full type inference, OTP 27+/29). Use the modern stdlib: built-in `JSON`, set-theoretic type warnings, `mix format`. ## Decision: do you even need a process? A process is not "an object": spawning one to hold a value you could pass as an argument is the most common beginner mistake, and it adds a serialization bottleneck and a failure mode for nothing. | Situation | Use | Why | |---|---|---| …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/elixir@sha256:dc450a0b3d4d478fThe line at the top of this page pins the label git:20260729.9b4d66a, 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_xfk6dr4iufr5ihfj)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.9b4d66a latest | 2026-07-29 | 9b4d66a | 11,740 B | A | view · diff |
| git:20260602.c9dc7fb | 2026-06-02 | c9dc7fb | 12,352 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 (11740 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
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xfk6dr4iufr5ihfj GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/elixir GET https://markdownregistry.com/api/v1/blob/dc450a0b3d4d478f6e7f7f348b8f0c31b410023a3c2ceaa862743291d39d4023
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 ericrisco/rsc-harness
Every file in ericrisco/rsc-harness