How do I install the Elixir Deploy skill?

Run npx skillmds@latest add nixopus/elixir-deploy in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Elixir Deploy free to use?

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Who published Elixir Deploy?

nixopus (@nixopus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Elixir Deploy by nixopus — Agent Skill

Name: Elixir Deploy
Author: nixopus

File contents

Elixir Deployment

Detection

Project is Elixir if mix.exs exists in the root.

Versions

Elixir

.elixir-version file
mix.exs → detected from project
mise.toml or .tool-versions
Defaults to 1.18

Erlang (OTP)

.erlang-version file
Resolved automatically from Elixir version
mise.toml or .tool-versions
Defaults to 27.3

Build

Build Process

Install Elixir and Erlang
Get and compile deps: mix deps.get --only prod and mix deps.compile
If defined: mix assets.setup
If defined: mix assets.deploy and mix ecto.deploy
Compile and release: mix compile and mix release

Start Command

/app/_build/prod/rel/<app_name>/bin/<app_name> start

Framework Detection

Signal	Framework
`mix.exs` + `phoenix` dep	Phoenix
`config/config.exs`	Standard Elixir app
`config/runtime.exs`	Runtime config (prod)

Phoenix-Specific

Asset pipeline: Node.js or esbuild; run mix assets.setup and mix assets.deploy
Ecto: mix ecto.setup (dev) / mix ecto.deploy (prod)
Release: mix release produces standalone tarball/binary

Install Stage Optimization

Copy in order:

mix.exs, mix.lock
config/ (full config directory)
lib/, test/, assets/ (Phoenix)

Base Images

Stage	Image
Build	`hexpm/elixir:1.18-erlang-27.3` or `elixir:1.18`
Runtime	`debian:bookworm-slim` + extracted release, or `elixir:1.18-slim`

Dockerfile Patterns

Phoenix Release

FROM hexpm/elixir:1.18-erlang-27.3 AS build
WORKDIR /app
RUN mix local.hex --force && mix local.rebar --force
COPY mix.exs mix.lock ./
RUN mix deps.get --only prod && mix deps.compile
COPY config config
COPY lib lib
COPY priv priv
COPY assets assets
RUN mix assets.deploy
RUN mix compile
RUN mix release

FROM debian:bookworm-slim
RUN apt-get update && apt-get install -y libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*
WORKDIR /app
COPY --from=build /app/_build/prod/rel/my_app ./
EXPOSE 4000
CMD ["./bin/my_app", "start"]

Plain Elixir (no Phoenix)

FROM hexpm/elixir:1.18-erlang-27.3 AS build
WORKDIR /app
COPY mix.exs mix.lock ./
RUN mix deps.get --only prod && mix deps.compile
COPY config config
COPY lib lib
RUN mix compile && mix release

FROM debian:bookworm-slim
RUN apt-get update && apt-get install -y libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*
WORKDIR /app
COPY --from=build /app/_build/prod/rel/my_app ./
CMD ["./bin/my_app", "start"]

---name: elixir-deploydescription: Build and deploy Elixir and Phoenix applications — version detection, mix releases, and Dockerfile patterns. Use when deploying an Elixir or Phoenix project, or when mix.exs is detected.---# Elixir Deployment## DetectionProject is Elixir if `mix.exs` exists in the root.## Versions### Elixir1. `.elixir-version` file2. `mix.exs` → detected from project3. `mise.toml` or `.tool-versions`4. Defaults to **1.18**### Erlang (OTP)1. `.erlang-version` file2. Resolved automatically from Elixir version3. `mise.toml` or `.tool-versions`4. Defaults to **27.3**## Build### Build Process1. Install Elixir and Erlang2. Get and compile deps: `mix deps.get --only prod` and `mix deps.compile`3. If defined: `mix assets.setup`4. If defined: `mix assets.deploy` and `mix ecto.deploy`5. Compile and release: `mix compile` and `mix release`### Start Command```/app/_build/prod/rel/<app_name>/bin/<app_name> start```## Framework Detection| Signal | Framework ||---|---|| `mix.exs` + `phoenix` dep | Phoenix || `config/config.exs` | Standard Elixir app || `config/runtime.exs` | Runtime config (prod) |### Phoenix-Specific- Asset pipeline: Node.js or esbuild; run `mix assets.setup` and `mix assets.deploy`- Ecto: `mix ecto.setup` (dev) / `mix ecto.deploy` (prod)- Release: `mix release` produces standalone tarball/binary## Install Stage OptimizationCopy in order:- `mix.exs`, `mix.lock`- `config/` (full config directory)- `lib/`, `test/`, `assets/` (Phoenix)## Base Images| Stage | Image ||---|---|| Build | `hexpm/elixir:1.18-erlang-27.3` or `elixir:1.18` || Runtime | `debian:bookworm-slim` + extracted release, or `elixir:1.18-slim` |## Dockerfile Patterns### Phoenix Release```dockerfileFROM hexpm/elixir:1.18-erlang-27.3 AS buildWORKDIR /appRUN mix local.hex --force && mix local.rebar --forceCOPY mix.exs mix.lock ./RUN mix deps.get --only prod && mix deps.compileCOPY config configCOPY lib libCOPY priv privCOPY assets assetsRUN mix assets.deployRUN mix compileRUN mix releaseFROM debian:bookworm-slimRUN apt-get update && apt-get install -y libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*WORKDIR /appCOPY --from=build /app/_build/prod/rel/my_app ./EXPOSE 4000CMD ["./bin/my_app", "start"]```### Plain Elixir (no Phoenix)```dockerfileFROM hexpm/elixir:1.18-erlang-27.3 AS buildWORKDIR /appCOPY mix.exs mix.lock ./RUN mix deps.get --only prod && mix deps.compileCOPY config configCOPY lib libRUN mix compile && mix releaseFROM debian:bookworm-slimRUN apt-get update && apt-get install -y libssl3 ca-certificates && rm -rf /var/lib/apt/lists/*WORKDIR /appCOPY --from=build /app/_build/prod/rel/my_app ./CMD ["./bin/my_app", "start"]```

Frequently asked questions

Elixir Deploy