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Elixir implementation of MCP and ACP. Build MCP clients/servers with tools, resources, prompts over stdio, HTTP/SSE, and BEAM. Control coding agents via ACP with adapters for Claude Code, Codex, and more.

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ex_mcp mix.exs
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mix.exs

defmodule ExMCP.MixProject do
use Mix.Project
@version "0.9.2"
@github_url "https://github.com/azmaveth/ex_mcp"
def project do
[
app: :ex_mcp,
version: @version,
elixir: "~> 1.17",
elixirc_paths: elixirc_paths(Mix.env()),
start_permanent: Mix.env() == :prod,
deps: deps(),
description: description(),
package: package(),
docs: docs(),
source_url: @github_url,
homepage_url: @github_url,
test_coverage: [tool: ExCoveralls],
dialyzer: [
plt_add_apps: [:mix, :ex_unit],
ignore_warnings: ".dialyzer_ignore.exs",
list_unused_filters: false,
plt_local_path: "priv/plts",
plt_core_path: "priv/plts"
]
]
end
def cli do
[
preferred_envs: [
coveralls: :test,
"coveralls.detail": :test,
"coveralls.post": :test,
"coveralls.html": :test,
"coveralls.github": :test
]
]
end
# Run "mix help compile.app" to learn about applications.
def application do
[
extra_applications: [:logger, :crypto, :ssl, :inets],
mod: {ExMCP.Application, []}
]
end
# Run "mix help deps" to learn about dependencies.
defp deps do
[
{:jason, "~> 1.4"},
{:mint, "~> 1.6"},
{:mint_web_socket, "~> 1.0"},
{:castore, "~> 1.0"},
{:horde, "~> 0.8", optional: true},
{:telemetry, "~> 1.2"},
{:ex_doc, "~> 0.36", only: :dev, runtime: false},
{:credo, "~> 1.7", only: [:dev, :test], runtime: false},
{:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
{:mox, "~> 1.2", only: :test},
{:sobelow, "~> 0.13", only: [:dev, :test], runtime: false},
{:excoveralls, "~> 0.18", only: :test},
{:git_hooks, "~> 0.7", only: [:dev], runtime: false},
{:plug_cowboy, "~> 2.7"},
{:plug, "~> 1.16"},
{:fuse, "~> 2.4", optional: true},
# ExMCP v2 dependencies
{:ex_json_schema, "~> 0.10"},
{:html_entities, "~> 0.5", only: [:dev, :test]},
{:propcheck, "~> 1.4", only: :test},
{:benchee, "~> 1.0", only: [:dev, :test]},
{:bypass, "~> 2.0", only: :test},
{:gen_state_machine, "~> 3.0"},
{:jose, "~> 1.11"}
]
end
defp description do
"""
Elixir implementation of MCP and ACP. Build MCP clients/servers with tools, resources, prompts over stdio, HTTP/SSE, and BEAM. Control coding agents via ACP with adapters for Claude Code, Codex, and more.
"""
end
defp package do
[
licenses: ["MIT"],
links: %{
"GitHub" => @github_url,
"Changelog" => "#{@github_url}/blob/master/CHANGELOG.md",
"MCP Spec" => "https://modelcontextprotocol.io",
"ACP Spec" => "https://agentclientprotocol.com"
},
files: ~w(lib .formatter.exs mix.exs README.md LICENSE CHANGELOG.md)
]
end
# Specifies which paths to compile per environment
defp elixirc_paths(:test),
do: [
"lib",
"test/support",
"test/ex_mcp/compliance",
"test/ex_mcp/compliance/features",
"test/ex_mcp/compliance/handlers"
]
defp elixirc_paths(_), do: ["lib"]
defp docs do
[
main: "readme",
name: "ExMCP",
canonical: "https://hexdocs.pm/ex_mcp",
extras: [
"README.md",
"docs/guides/USER_GUIDE.md",
"docs/guides/PHOENIX_GUIDE.md",
"docs/DSL_GUIDE.md",
"docs/TRANSPORT_GUIDE.md",
"docs/CONFIGURATION.md",
"docs/SECURITY.md",
"docs/ARCHITECTURE.md",
"docs/DEVELOPMENT.md",
"docs/TROUBLESHOOTING.md",
"docs/ACP_GUIDE.md",
"CHANGELOG.md"
],
extra_section: "GUIDES",
source_ref: "v#{@version}",
groups_for_extras: [
Introduction: ~r/README/,
Guides:
~r/USER_GUIDE|PHOENIX_GUIDE|DSL_GUIDE|TRANSPORT_GUIDE|ACP_GUIDE|CONFIGURATION|SECURITY|ARCHITECTURE|DEVELOPMENT|TROUBLESHOOTING/,
Changelog: ~r/CHANGELOG/
],
groups_for_modules: [
"MCP Specification": [
ExMCP.Protocol,
ExMCP.Types,
ExMCP.Server,
ExMCP.Server.Handler,
ExMCP.Transport.Stdio,
ExMCP.Transport.SSE
],
"MCP + Extensions": [ExMCP.Client],
"Agent Client Protocol (ACP)": [
ExMCP.ACP,
ExMCP.ACP.Client,
ExMCP.ACP.Client.Handler,
ExMCP.ACP.Client.DefaultHandler,
ExMCP.ACP.Protocol,
ExMCP.ACP.Types,
ExMCP.ACP.Registry,
ExMCP.ACP.Adapter,
ExMCP.ACP.AdapterBridge,
ExMCP.ACP.AdapterTransport,
ExMCP.ACP.Adapters.Claude,
ExMCP.ACP.Adapters.Codex,
ExMCP.ACP.Adapters.Pi
],
"ExMCP Extensions": [
ExMCP.Transport.Beam,
ExMCP.ServerManager,
ExMCP.Discovery
],
Internal: [ExMCP.Transport, ExMCP.Application]
],
before_closing_body_tag: fn
:html ->
"""
<script>
// Add copy button to code blocks
document.addEventListener('DOMContentLoaded', function() {
var blocks = document.querySelectorAll('pre code');
blocks.forEach(function(block) {
var button = document.createElement('button');
button.className = 'copy-button';
button.textContent = 'Copy';
button.addEventListener('click', function() {
navigator.clipboard.writeText(block.textContent);
button.textContent = 'Copied!';
setTimeout(function() { button.textContent = 'Copy'; }, 2000);
});
block.parentNode.insertBefore(button, block);
});
});
</script>
<style>
.copy-button {
position: absolute;
top: 5px;
right: 5px;
padding: 2px 8px;
font-size: 12px;
background: #f0f0f0;
border: 1px solid #ccc;
border-radius: 3px;
cursor: pointer;
}
pre { position: relative; }
</style>
"""
_ ->
""
end
]
end
end