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Replicas supports fx, Vercel Labs’ native coding-agent harness.

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Setup

  1. Create a key in Vercel AI Gateway.
  2. Paste it under fx → Vercel AI Gateway API Key in Coding Agents settings.
  3. Set an organization credential, or add a personal key to override it.
See Credentials for credential scope behavior.

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Using fx

Choose fx from the workspace agent picker. Replicas runs the pinned native binary through its Agent Client Protocol server, preserving sessions and streamed messages across turns. fx can read and edit files, run commands, report tool progress, use Plan Mode, and interrupt active turns. It does not currently accept image attachments or support Codex goal mode. Models come from Vercel AI Gateway. zai/glm-5.2 is the default.

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Programmatic Use

Use fx anywhere Replicas accepts a coding-agent provider:
The API, MCP, Automations, and Defaults surfaces also accept fx.