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Module prompt

bob_runtime

Module prompt 

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§Prompt Builder

Prompt builder — assembles LlmRequest from session state, tool descriptors, and system instructions.

§Overview

The prompt builder constructs the complete LLM request by combining:

  1. System instructions: Core instructions + action schema + tool schemas
  2. Session history: Message history (truncated to most recent 50 non-system messages)
  3. Tool definitions: Available tools and their schemas

§Components

  • Action Schema: JSON schema for the action protocol
  • Tool Schema Block: Formatted list of available tools
  • History Truncation: Keeps most recent messages to fit context limits

§Example

ⓘ
use bob_runtime::prompt::build_llm_request;
use bob_core::types::{SessionState, ToolDescriptor};

let session = SessionState::default();
let tools = vec![];
let request = build_llm_request("openai:gpt-4o-mini", &session, &tools, "You are helpful.");