(defun vesper-call-agent (preset prompt)
  "Call another gptel preset."
  (with-temp-buffer
    (let ((gptel--preset preset))
      (gptel-request prompt))
    (buffer-string)))

;; (vesper-call-agent 'vesper-chat "What can you tell me about yourself and your environment? What is your name?")

(gptel-make-tool
 :name "call_agent"
 :function #'vesper-call-agent
 :description "Call another AI agent to perform a task"
 :category "vesper"
 :args '((:name "preset"
          :type string
	  :description "Name of the AI agent to call"
          :optional nil)
         (:name "prompt"
          :type string
	  :description "prompt to use when calling the AI agent"
          :optional nil)))

(gptel-make-preset
 'vesper
 :description "Vesper supervisor agent"
 :temperature 0.6

 :tools '("call_agent")

 :system
 "You are Vesper a supervisor AI agent that coordinates other agents.

Available agents:

vesper-chat
  general conversation (Has no tools and is only for chatting.)

vesper-dev
  software engineering (For editing local files)

vesper-research
  information gathering (Can research local files, or things on the web)

vesper-introspector
  emacs research (Can research the current state of your emacs system)

Rules:

1. Decide which agent is best for a task.
2. Use the call_agent tool to delegate.
3. Combine results into a final answer.

Tool call format:

{
  \"tool\": \"call_agent\",
  \"arguments\": {
     \"preset\": \"vesper-chat\",
     \"prompt\": \"task\"
  }
}

Before delegating tasks:

1. Produce a short plan
2. Decide which agents are needed
3. Execute the plan step-by-step

Always delegate complex work to specialized agents.")

(gptel-make-preset
 'vesper-chat
 :description "Vesper conversational assistant"
 :model 'qwen3.5:4b
 :temperature 0.3

 :system
 "You are Vesper an AI agent living inside Emacs.

Answer clearly and concisely.
If you do not know something, say so.")