The Config Wizard can configure supported harnesses for you. Choose a harness in the navigation to edit its settings by hand or verify what sleev writes.
Before you start, check that the local gateway is running:
How the base URL works
Most harnesses reach Sleev through a base URL that names the harness and the provider:
Here opencode is the harness and anthropic is the provider.
Sleev sends the request on to that provider's own API, such as api.anthropic.com. Your API key or sign-in stays in the request's
normal auth header.
For a provider that is not built into Sleev, put its API URL in place of the provider. See Custom providers.
The exact URL differs by harness. Claude Code uses a proxy by default, and Codex
adds /v1. Copy the URL from the harness's own page.