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Facet

Official registry Productivity

Build, check and call a specialized model for one narrow task, from your agent.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http facet 'https://facet.halfspacelabs.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "facet": {
            "type": "http",
            "url": "https://facet.halfspacelabs.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Facet plugins

Facet builds a specialized model for one narrow task, checks every change against plain-language Expectations, and serves it through an OpenAI-compatible API. This repository is its agent plugin: the remote MCP server and the use-facet Skill, for every agent that takes plugins.

  • Claude Code: /plugin marketplace add halfspacelabs/facet-plugins, then /plugin install facet@facet
  • Cursor: install Facet from the Cursor marketplace
  • Codex and ChatGPT: install Facet from the plugin directory
  • Any MCP client: add https://facet.halfspacelabs.com/mcp; it signs you in with OAuth

Docs: facet.halfspacelabs.com/docs/agents

This repository is published from plugin/ in Facet's own repository; change it there.

Frequently asked questions

What is Facet?

Build, check and call a specialized model for one narrow task, from your agent.

How do I install Facet?

It runs as a remote server. In Claude Code: claude mcp add --transport http facet 'https://facet.halfspacelabs.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Facet need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Facet open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Facet?

It is published by halfspacelabs. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.