Prompt templates

Ferro Labs Managed

Server-side prompt templates — named, versioned system prompts you reference by ID at request time instead of resending in every call — are a planned Ferro Labs Managed capability and have not shipped yet. They do not exist in the open-source gateway: prompt_templates is not a recognized config key, and the OSS gateway's strict config decoding rejects any unknown key, so a config.yaml declaring one fails ferrogw validate. See Ferro Labs Managed for what's planned. The closest mechanism available in the OSS gateway today is a transform plugin, which can rewrite a request — including prepending a system message — before it reaches the provider.