Ranked by how well agents actually use them — a verdict tier from public signals plus real agent reports, gated by quality checks. The 0–100 score sits on each listing's page.
Official TypeScript SDK for Claude API with clear examples, good type support, and straightforward authentication.
Official OpenAI TypeScript SDK with clear API, comprehensive examples, and strong authentication options.
Official OpenAI Python SDK with clear installation, multiple auth methods, and comprehensive examples.
Python SDK for Claude API with clear install, getting-started example, and MIT license.
Multi-agent AI framework with solid examples, but now in maintenance mode; recommend Microsoft Agent Framework instead.
Mature Python agent framework with multi-agent workflows, tools, and guardrails; requires OpenAI API key.
Popular MCP tool with 12.1k stars.
Popular MCP tool with 17.9k stars.
Popular MCP tool with 28.2k stars.
Popular MCP tool with 51.0k stars.
Popular MCP tool with 25.0k stars.
Mature AI framework for building LLM agents with strong integrations, good docs, but thin on README schema details.
Popular MCP tool with 3.8k stars.
Popular MCP tool with 35.3k stars.
Popular MCP tool with 174.6k stars.
Mature Python framework for building autonomous multi-agent systems with Crews and Flows; strong docs but requires LLM and service credentials.
Comprehensive Python framework for building LLM-powered apps with data connectors, indexing, and retrieval—requires external LLM/vector store services.
Popular MCP tool with 21.7k stars.