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Elixir implementation of the Machine Payments Protocol (MPP) — HTTP 402 payment middleware for AI agents and machine-to-machine commerce. Supports Stripe, Tempo, and generic EVM payment methods with pluggable architecture.

Security advisory: This version has known vulnerabilities. View advisories
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mpp lib mix tasks mpp.manifest.ex
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lib/mix/tasks/mpp.manifest.ex 

defmodule Mix.Tasks.Mpp.Manifest do

  @shortdoc "Generate api_manifest.json from descripex metadata"



  @moduledoc """

  Generates a static `api_manifest.json` from the library's descripex annotations.



  The manifest is a JSON-serializable representation of every public function

  in the library — params, return types, errors, specs, and descriptions.

  Suitable for agent discovery, validators, and API generation.



      mix mpp.manifest

      mix mpp.manifest path/to/output.json



  Uses `MPP.__descripex_modules__/0` as the single source of truth for which

  modules to include. Output defaults to `api_manifest.json` in the project root.

  """



  use Mix.Task



  @default_output "api_manifest.json"



  @impl Mix.Task

  def run(args) do

    output_file = List.first(args) || @default_output

    modules = MPP.__descripex_modules__()

    manifest = Descripex.Manifest.build(modules)

    json = Jason.encode!(manifest, pretty: true)

    File.write!(output_file, json)

    # Use IO.puts instead of Mix.shell().info to avoid Dialyzer PLT warning

    IO.puts("Generated #{output_file} (#{length(modules)} modules)")

  end

end