llamaindex-lastsearch

LlamaIndex integration for LastSearch — verified web search with citations and confidence scores for AI agents.

Installation

pip install llamaindex-lastsearch

Quick Start

from llama_index.core.agent import ReActAgent
from llama_index.llms.openai import OpenAI
from llamaindex_lastsearch import LastSearchAnswerTool, LastSearchSearchTool

# Create tools
answer_tool = LastSearchAnswerTool(api_key="ls_xxx")
search_tool = LastSearchSearchTool(api_key="ls_xxx")

# Create agent
llm = OpenAI(model="gpt-4o")
agent = ReActAgent.from_tools([answer_tool, search_tool], llm=llm, verbose=True)

# Research with verified answers
response = agent.chat("What are the latest findings on mRNA vaccine efficacy?")
print(response)

Available Tools

• LastSearchAnswerTool — Verified research with citations, confidence scores, contradiction detection
• LastSearchSearchTool — Web search returning ranked results
• LastSearchExtractTool — Extract structured claims from a URL
• LastSearchCompareTool — Compare raw LLM vs verified answer

All tools are returned as FunctionTool instances, compatible with any LlamaIndex agent.

Why LastSearch?

Unlike raw search APIs, LastSearch fact-checks results. Every answer includes per-claim verification, cross-source consensus, contradiction detection, and evidence-based confidence scores. Open source (Apache 2.0).

Links

• Website · GitHub · Discord
• Python SDK · LangChain · CrewAI · MCP Server

License

Apache 2.0