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AgentsyComposable infrastructure for LLM systems

Build headless agentic workflows in Node.js-compatible runtimes, align with open standards like MCP and AG-UI, and add UI layers only when you actually need them.

Used today in VS Code Copilot Chat

Agentsy already powers third-party model support in three published VS Code extensions for GitHub Copilot Chat:

ExtensionWhat it brings into Copilot Chat
OpilotOllama models with tool support, vision support, streaming, and local-model workflows
Z.ai for CopilotZ.ai coding models with tool calling, streaming, and MCP-assisted capabilities
Mistral for CopilotMistral AI models with streaming, tool calling, and vision support

That means this package family is already doing real work in editor-native integrations — not just waiting around in a roadmap wearing a fake mustache.

Start here

Evaluate the framework

Why this stack exists

Agentsy is meant for developers building agentic tools that need dependable runtime plumbing more than flashy first-party surfaces:

  • headless workflows running in Node.js-compatible runtimes
  • CLI and operator tooling
  • editor integrations and coding agents
  • standards-aware systems that want to work with open ecosystem protocols instead of a captive vendor stack

Adopt the current packages

Contribute to the monorepo

  • Open the developer guide
  • Review the roadmap
  • Cross-check future-facing work against the plan/ documents referenced throughout the architecture pages

Package status model

Agentsy documentation uses three labels consistently:

StatusMeaning
PublishedPublic package with an installable npm release today
PrivateRepo-internal package used for verification or tooling
PlannedDescribed in plan/, not yet implemented as package code
  1. Why Agentsy
  2. Architecture overview
  3. Stream processing flow
  4. Package catalog
  5. API index

Planning sources

The platform narrative on this site is grounded in these planning documents:

  • plan/agentsy-prd.md
  • plan/agentsy-tech.md
  • plan/agentsy-platform-v2.md
  • plan/agentsy-features-v1.md

Those documents inform future-facing pages, but they are not treated as evidence that a package or API already ships.

Open source under GPL-3.0-or-later License