open-harness

E2B provides JavaScript and Python SDKs for starting isolated cloud sandboxes where agents can execute commands or generated code without running directly on the host. The managed service requires an E2B API key, and a separate Code Interpreter package adds higher-level code execution. Self-hosting is documented through Terraform, with current provider support centered on AWS and Google Cloud.

Cloudflare Agents uses Durable Objects to give each agent its own persistent state, storage, and lifecycle. The SDK includes callable methods, WebSockets, scheduling, AI chat, MCP, and workflow integration, with client helpers for real-time synchronization. Developers can start from the provided template or add the package to an existing Cloudflare application.

OpenMemory adds persistent memory to LLM applications through Python and Node SDKs or a multi-user backend with an HTTP API, dashboard, and MCP endpoint. It models different memory sectors, temporal relationships, decay, and reinforcement rather than relying only on similarity search, and exposes traces showing why a memory was recalled. Storage can remain self-hosted in SQLite or PostgreSQL, making it useful for agents and copilots that need durable memory under their own control.

Composio creates a separate session for each user and gives an agent runtime access to app authentication, tool discovery, and execution without loading hundreds of definitions into context. It offers TypeScript and Python SDKs, a CLI, framework adapters, and hosted MCP endpoints for more than 1,000 app toolkits. Setup requires a Composio API key and the relevant connected user accounts.