GemStackFramework-agnostic tools for building AI applications in Node.

An agent runtime, portable skills, multi-agent orchestration, and an MCP toolkit - standalone packages that work in any Node app and compose cleanly with each other.

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What is GemStack?

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Provider-agnostic agent runtime

Define an agent once; swap Anthropic, OpenAI, Google, Ollama, Groq, DeepSeek, xAI, Mistral, and more by changing one config string. Tool calling, streaming, middleware, structured output, and memory included.

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Portable capability bundles

Ship a skill as a folder - instructions + tools + resources - and compose it onto an agent on demand. The same SKILL.md shape Claude uses.

🎛️

Multi-agent orchestration

A Supervisor that plans, dispatches subagents under bounded concurrency and token budgets, and synthesizes the result. Pluggable plan / workers / synthesize stages.

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Model Context Protocol, both directions

Bridge agents to MCP - consume a remote server's tools or expose an agent as a server - and author standalone MCP servers with tools, resources, prompts, and OAuth 2.1.

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Zero framework lock-in

Each package works in any fetch-capable JS runtime. The agent runtime's only required dependency is zod; persistence is via neutral contracts you implement against your own infrastructure.

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Graduated, not dumped

Packages join GemStack one at a time, when they prove framework-agnostic value - built in the open with the Vike team.