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#!/usr/bin/env ruby
require "json"
require "net/http"
require "reline"
require "uri"
API_KEY = ENV["OPENAI_API_KEY"] or abort("Set OPENAI_API_KEY")
MODEL = ENV["MODEL"] || "gpt-5"
TOOLS = [
{
type: "function",
function: {
name: "read_file",
description: "Read contents of a file",
parameters: {
type: "object",
properties: { path: { type: "string" } },
required: ["path"]
}
}
},
{
type: "function",
function: {
name: "write_file",
description: "Write contents to a file",
parameters: {
type: "object",
properties: { path: { type: "string" }, content: { type: "string" } },
required: ["path","content"]
}
}
},
{
type: "function",
function: {
name: "run_command",
description: "Run a shell command and return output",
parameters: {
type: "object",
properties: { command: { type: "string" } },
required: ["command"]
}
}
}
]
def run_tool(name, args)
case name
when "read_file"
{ content: File.read(args["path"]) }
when "write_file"
{ bytes_written: File.write(args["path"], args["content"]) }
when "run_command"
{ output: `#{args["command"]}`.strip }
else
{ error: "unknown tool #{name}" }
end
rescue => e
{ error: e.message }
end
def openai_chat(messages, tools, timeout: 60)
uri = URI("https://api.openai.com/v1/chat/completions")
req = Net::HTTP::Post.new(uri)
req["Authorization"] = "Bearer #{API_KEY}"
req["Content-Type"] = "application/json"
req.body = {
model: MODEL,
messages: messages,
tools: tools,
tool_choice: "auto"
}.to_json
http = Net::HTTP.new(uri.hostname, uri.port)
http.use_ssl = true
http.open_timeout = timeout
http.read_timeout = timeout
http.write_timeout = timeout if http.respond_to?(:write_timeout=)
res = http.start { |h| h.request(req) }
code = res.code.to_i
raise "HTTP #{res.code}: #{res.body}" unless res.is_a?(Net::HTTPSuccess)
JSON.parse(res.body)
end
messages = [{ role: "system", content: "You are a reasoning coding and system agent." }]
puts ">> Type instructions (or 'exit')"
loop do
input = Reline.readline("User> ", true)&.strip
break if input.nil? || input.downcase == "exit"
messages << { role: "user", content: input }
loop do
message = openai_chat(messages, TOOLS).dig("choices", 0, "message")
messages << message
if message["content"] && !message["content"].empty?
puts "\nAssistant> #{message['content']}"
end
if message["tool_calls"]
message["tool_calls"].each do |call|
name = call.dig("function","name")
args = JSON.parse(call.dig("function","arguments"))
puts "Tool> ▶ #{name}(#{args})"
result = run_tool(name, args)
messages << { role: "tool", tool_call_id: call["id"], content: JSON.dump(result) }
end
next # continue reasoning on tool results
end
break # no tool calls left, turn is done
end
end
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