Skills

Skills are reusable procedures that tell OpenClaw how to perform a class of work safely. They sit above plugins and APIs: a skill selects tools, applies validation and approval boundaries, and specifies what evidence is required.
Documented relationships
bookstack-controlled-sync uses the BookStack API and requires fresh read-back verification.
paperless-ngx uses the Paperless REST API for document workflows.
proxmox-readonly limits Proxmox work to inventory and health reads.
configure-channel, 
add-model-provider and protected-secret procedures handle setup without exposing credentials.
Browser, email, voice and control-UI skills use their corresponding plugins or provider tools.
Skills describe procedures, while plugins expose capabilities and services hold the underlying data.