Elixir & Phoenix Skills

ariesclark Claude Code skills

A Claude Code marketplace catalog of skills, organized as domain plugins you install independently. Currently: idiomatic Elixir & Phoenix skills and a Fly.io ops skill.

Install

Add the marketplace once, then install the plugins you want:

/plugin marketplace add ariesclark/skills
/plugin install elixir-phoenix@ariesclark
/plugin install fly@ariesclark

Plugins

elixir-phoenix

Idiomatic Elixir & Phoenix backend skills.

Skill	What it covers
elixir-conventions	The "Good and Bad Elixir" rules: error tuples vs. raising, with/case, assertive matching, pipelines
otp	GenServer, Supervisor/DynamicSupervisor, Task, Registry, ETS, process lifecycle
ecto	Schemas, per-operation changesets, cast_assoc/cast_embed, Ecto.Multi, migrations, N+1/indexes
phoenix-json-api	:api pipeline, action_fallback with no catch-all, a unified error type, pagination, token auth
phoenix-authorization	Server-side checks, scope-over-filter (IDOR-proof), policy modules
phoenix-security	Atom exhaustion, SQL injection, XSS, open redirects, password hashing, constant-time comparison
oban	Worker return semantics (:ok/:cancel/:discard/{:error}), idempotency, unique jobs, testing
observability	Structured JSON logging, :telemetry, OpenTelemetry, error reporting, metrics
phoenix-deployment	runtime.exs vs compile-time config, release migrations, runtime env, health checks
elixir-testing	ExUnit, DataCase/ConnCase, the Ecto sandbox, fixtures, assertive tests

fly

Fly.io infrastructure ops: Prometheus/VictoriaLogs queries, fly ssh, production Postgres.

prior-art

Before building CI, tooling, infra, or reimplementing functionality, search for existing prior art (in-repo patterns, official/upstream repos, reusable actions, libraries) and mirror it instead of hand-rolling.

Repository layout

.
├── .claude-plugin/
│   └── marketplace.json        # the catalog (pluginRoot: ./plugins)
└── plugins/
    ├── elixir-phoenix/
    │   ├── .claude-plugin/plugin.json
    │   ├── CHANGELOG.md
    │   └── skills/             # one directory per skill
    ├── fly/
    │   ├── .claude-plugin/plugin.json
    │   ├── CHANGELOG.md
    │   └── skills/fly/         # SKILL.md + references/
    └── prior-art/
        ├── .claude-plugin/plugin.json
        ├── CHANGELOG.md
        └── skills/prior-art/

Local development

Add this repo as a local marketplace and install from it. Changes to a skill's SKILL.md take effect immediately; other changes need /reload-plugins:

/plugin marketplace add /path/to/this/repo
/plugin install elixir-phoenix@ariesclark

Validate a plugin's structure and manifest before publishing:

claude plugin validate ./plugins/elixir-phoenix --strict
claude plugin validate ./plugins/fly --strict

References

• elixir-phoenix-guide: Joseph Morgan (MIT); foundation for the Elixir & Phoenix skills.
• Chris Keathley, Good and Bad Elixir (source); foundation for elixir-conventions.

License

MIT. See LICENSE.