LLM-Only Agent

The LLM-Only agent provides a pure conversational experience with no tools or external data sources. It is the simplest agent in the AI Optimizer.

• The system prompt is fetched from the MCP server (optimizer_basic-default). If unavailable, a default instruction is used.
• build_llm_only_agentspec creates a portable AgentSpec Agent with no tools — pure LLM conversation.
• The session manages conversation state. Turns are always stored and returned by the history API. When chat_history is disabled, turns are excluded from future LLM context and remain available to inspect or clear through the history API.
• Failed turns are fully rolled back — the user message and any partial response are removed so subsequent turns are not corrupted.