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BEAM runtime bridge for pi development agents

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pi_bridge lib pi mcp jsonrpc.ex
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lib/pi/mcp/jsonrpc.ex 

defmodule Pi.MCP.JSONRPC do

  @moduledoc "JSON-RPC response helpers for MCP HTTP transports."



  alias Pi.MCP.Tools



  def handle(%{"jsonrpc" => "2.0", "id" => id, "method" => "tools/call", "params" => params}) do

    name = params["name"]

    args = params["arguments"] || %{}



    case Tools.dispatch(name, args) do

      {:ok, text} -> success(id, text)

      {:error, message} -> tool_error(id, message)

    end

  end



  def handle(%{"jsonrpc" => "2.0", "id" => id, "method" => "initialize"}), do: empty(id)

  def handle(%{"jsonrpc" => "2.0", "id" => id}), do: empty(id)

  def handle(_), do: {:error, %{error: "Invalid request"}}



  def success(id, text) do

    {:ok, %{jsonrpc: "2.0", id: id, result: %{content: [%{type: "text", text: text}]}}}

  end



  def tool_error(id, message) do

    {:ok,

     %{

       jsonrpc: "2.0",

       id: id,

       result: %{content: [%{type: "text", text: message}], isError: true}

     }}

  end



  def empty(id), do: {:ok, %{jsonrpc: "2.0", id: id, result: %{}}}

end