Best-of shortlists for AI-agent builders

Let agents authenticate and take real actions in SaaS apps (OAuth, tool catalogs).

Libraries for orchestrating LLM agents, tools, and multi-step control flow.

Long-term and working memory for agents that persist across runs.

Sandboxes and execution environments for running agent code/tools.

Cloud browsers and web-automation runtimes agents drive to act on the web.

Hosted coding agents, code-gen, and developer tools with APIs.

People/company intelligence, scraping, and structured web data for agents.

Programmatic email, messaging, and phone infrastructure agents use to reach the world.

Measuring agent and LLM output quality, regressions, and safety.

Model routers, unified APIs, and fast hosted inference for open + frontier models.

Model Context Protocol servers and tool-calling infrastructure.

Hosted long-term memory and context services for stateful agents.

Tracing, logging, and monitoring for LLM and agent systems.

Hosted tracing, monitoring, and evaluation platforms for LLM and agent systems.

Durable execution and workflow platforms for long-running agent pipelines.

Payments, usage billing, and agent-commerce rails for monetizing AI products.

Managed code sandboxes and execution environments for agent-written code.

Web search and retrieval APIs built for LLMs and agents — clean results, page contents, RAG.

Embedding stores powering retrieval for RAG and agent recall.

Managed vector databases and serverless data infra for RAG and agents.

Text-to-speech, transcription, voice agents, and AI video/avatar APIs.