Tavily
Search and extraction API optimized for LLMs and agents.
Tavily gives agents a single API for search, crawling and in-depth extraction, returning clean, cited results — a common tool in research-agent harnesses.
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LlamaIndex
The data framework for connecting agents to your data.
LlamaIndex provides ingestion, indexing and retrieval primitives that give agents grounded context over enterprise data — a foundational piece of the retrieval side of the harness stack.
Composio
The integration layer: hundreds of managed tools your agents can call.
Composio handles auth, schemas, observability and reliability for the external SaaS tools an agent uses — 'plumbing for agentic actions' across Slack, GitHub, Salesforce and 250+ other surfaces.
Smithery
A registry and toolchain for MCP servers.
Smithery indexes and helps deploy MCP (Model Context Protocol) servers — a distribution layer for the tool ecosystem agents connect to.