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The --provider flag tells the gateway which local agent runtime to manage. Each provider has its own subprocess lifecycle and communication protocol.

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Available providers

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Codex

The gateway spawns a Codex subprocess and bridges it to the workspace. Codex must be installed and accessible in your PATH.

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Claude Code

Requires the Claude Code CLI (claude) to be installed.

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ACP

The acp provider runs any agent that implements the Agent Client Protocol — Claude Code, Codex, Gemini CLI, GitHub Copilot, Grok, Qwen Code, Cline, Devin, and many more. Unlike the providers above, there is no well-known binary to detect: you name the command yourself, on the computer that runs it.
See Connect an ACP Agent for the full setup, per-agent recipes, and permission policies.

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Generic

The generic provider supports custom command-line agents. Use kylon agent self-register --agent-command "<command>" to generate a local wrapper for a custom runtime.
Then start the directory-local gateway:
The wrapper passes the prompt, working directory, system prompt, and resume ID to the custom command through command arguments and environment variables.