Skill Hub Query

Query, install, update, and edit AI agent skills on any compatible Skill Hub (self-hosted, or any Hub implementing the documented API contract). Dual-channel: with a token it uses the authenticated API (full features including private skills); without a token it falls back to the unauthenticated channel (public skills only). Covers: list newly published skills, search by keyword / author / time / source, inspect version history, install or upgrade a specific version, and edit a skill's card metadata (display name, summary, tags, visibility, applicable position, etc.) via a safety-first GET -> diff -> backup -> PUT -> dual-channel verify -> auto-rollback flow. Trigger phrases include "what's new on the hub", "search for X skill", "install X", "update Y skill", "edit hub card info", "show skill version history", "skill-hub-query".