GET /api/v1/channels/webchat/skills?agentId=<optional>&visitorId=<required>
Headers: X-MC-Key + X-MC-Visitor-Token
Downstream systems integrating via the webchat SSE endpoint have no way
today to enumerate the skills a visitor can invoke — the existing
GET /api/v1/skills is JWT + workspace-role gated, unreachable from the
API-Key-authenticated webchat channel. Without a list, integrators
can't render a slash picker UI; visitors have to know skill slugs by
heart.
The new endpoint mirrors the /stream auth chain (resolveChannel +
verifyVisitorToken) and reuses AgentBindingResolver.getBoundSkillIds
to scope visibility. Only enabled skills explicitly bound to the agent
surface; agents with no explicit bindings return an empty list rather
than inheriting the global pool (the agent config stays the source of
truth for what surfaces in visitor UI). The agentId anti-escalation
guard from /stream is reused verbatim — an explicit agentId must
belong to the channel's workspace.
Returns WebChatSkillView (id / name / nameZh / nameEn / description /
icon). Deliberately omits SKILL.md content, configJson and
securityScanResult: those never leave the admin console.
Issue: #373
31c98e923d