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The web app is Fleet Prime Agent’s browser interface. It renders every tool call as a card, streams the model’s response as it’s produced, and lets you switch models and branches without leaving the tab.

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Run it

Open http://127.0.0.1:<port> — the port is printed on startup. The server binds to 127.0.0.1 only. It has no multi-user auth. Do not expose it beyond localhost without your own auth layer in front — see Security.

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What you get

  • Streaming chat — ChatStreamEvent events over NDJSON. See Streaming chat.
  • Tool cards — a card per tool call, rendered by BEUI components in web/design. See Tool cards.
  • Session list — resume, fork, or search sessions. See Sessions.
  • Model picker — swap providers and models mid-session.
  • Slash commands — /login, /refine, and everything else you’d get in the TUI.

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How it plugs into the runtime

The browser never imports agent packages directly. Only the web server adapter (web/server/src/event-mapper.ts) imports @earendil-works/* — it translates AgentSessionEvent from the agent runtime into ChatStreamEvent NDJSON for the browser and AgentSessionEvent SSE for out-of-turn events. Contracts stay in web/protocol (chat-protocol.ts, fleet-contract.ts) and must be updated in lockstep with the adapter.
Last modified on August 17, 2026