AgentsKit vs sandbase-harness
JavaScript agent toolkit and self-hosted runtime compared
AgentsKit is a modular TypeScript toolkit for building agents and adding capabilities such as tools, memory, retrieval, and chat interfaces. sandbase-harness is a self-hosted runtime focused on persistent sessions, sandboxed tool execution, and operational controls; the main distinction is toolkit breadth versus running and governing agents on your own infrastructure.
AgentsKit: Build Modular AI Agents in JavaScript
AgentsKit is a TypeScript toolkit for building AI agents in JavaScript, from chat interfaces to autonomous runtimes. Its small core and shared contracts connect provider adapters, tools, memory, retrieval, and UI packages.
sandbase-harness: Run Self-Hosted AI Agents with Sandboxed Tools
SandBase Harness is a local-first AI agent runtime and MCP bridge, with a built-in Console and Anthropic Claude Managed Agents-style API. It provides sessions, sandboxed tools, memory, credential controls, and audit and replay on your own machine or infrastructure.
| AgentsKit | sandbase-harness | |
|---|---|---|
| Language | TypeScript | TypeScript |
| License | MIT | Apache-2.0 |
| Stars | 36 | 639 |
| Forks | 3 | 80 |
| Last analyzed | Oct 20, 2026 | Oct 19, 2026 |
Key differences
- AgentsKit provides composable packages for building agent applications, while sandbase-harness provides a runtime, Console, MCP bridge, SDK, and CLI for operating agents.
- AgentsKit supports multiple UI frameworks, including React, Vue, Svelte, Solid, Angular, React Native, and terminal interfaces; sandbase-harness centers on its Console and API.
- AgentsKit offers an autonomous runtime alongside provider adapters and optional retrieval, memory, and UI packages; sandbase-harness emphasizes persistent sessions, audit and replay, credential controls, and sandbox backends.
- AgentsKit is MIT-licensed, while sandbase-harness is Apache-2.0-licensed.
- AgentsKit identifies its core package as stable and other listed packages as beta; sandbase-harness is described as new and changing fast, with deployment and compatibility considerations varying by backend.
Choose AgentsKit if you…
- need composable TypeScript packages for building an agent application, from chat to autonomous execution.
- want to use a supported UI framework or switch among provider adapters while sharing contracts.
- need optional retrieval, memory, tools, or skills as part of a broader JavaScript agent stack.
Choose sandbase-harness if you…
- need a self-hosted runtime with persistent sessions, audit logs, and replay.
- want sandboxed tool execution through local processes, Docker, Kubernetes, or self-hosted workers.
- need runtime controls such as permission policies, approval gates, credential vaults, and an MCP bridge.
Compare the numbers side by side, or add more projects
This comparison is generated with AI from the OSRepos analyses of both projects. Always check each project's repository and documentation before choosing.