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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, interrupt active turns, and steer queued messages. Its current ACP server does not advertise image input, and it does not support Codex goal mode.
fx does not support pre-tool hooks. Organization security policies that block actions are not enforced in fx chats; the chat tab shows a warning icon for this limitation.
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.