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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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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.