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All API requests require an API key passed via the API-Key header.
API-Key: <your-api-key>

Obtaining a Key

Via the CLI:
simlab auth login
This opens platform.collinear.ai where you can find your key under Developers → API Keys. The key is stored in ~/.config/collinear/config.toml. Or set it as an environment variable:
export COLLINEAR_API_KEY="<your-api-key>"

Error Responses

StatusMeaning
400Invalid request - see response for details
401Invalid or missing API key
403Key valid but insufficient permissions
503Service temporarily unavailable