Plugin contributions attach by type to different places in the product. Usability is judged per contribution. A Skill inside the package is one contribution among others. Each contribution has its own identity, type, compatibility conditions, and readiness.

Contribution	Attach point
Skill / MCP	Agent conversation; visible to that agent after Agent binding
App UI	Preview, settings page, commands, custom surface in a VibeX window
Workflow	Orchestration; publish path matches the source file in the repo
Host Worker	Host background; clients observe a projection
Runtime	Exact CLI / Binary / sidecar version, resolved and locked by the Host

Binding and readiness

Enable allows those contributions to be published. Missing runtime, missing binding, or an agent that rejects the contribution leaves it unready. All-agents binding intent projects compatible contributions onto current and future enabled agents that support the capability. Exclusions are stored separately.

A Skill projection is a controlled read-only entry written to the agent-native Skill location. A user Skill of the same name stays. A Plugin Command and an agent-native command may share a display name and remain distinct by source identity.

A remote workstation changes state on the Host. Companion and chat-channel plugin management lives in Settings → Plugins on the Host or a workstation desktop.

Runtime lock

A Runtime requirement is an author declaration. The install lock records the exact version the Host resolved, integrity, and probe evidence. A successful declaration and a spawned process still require a passing probe before ready. A Host-owned Runtime enters reclamation only after references drop to zero.

The Host family ships official product plugins marked VibeX built-in. They start disabled and stay in the catalog. After the runtime is on disk, enable still has to be turned on. Later new or rebound conversations receive injection. The switch lives on the plugin itself.

Plugin	Effect after enable
Session Enhance	Questions, live feedback, session lookup, and session control
Multi-agent	& as a delegation mention; depth and child defaults apply to delegated children
Workflow Creator	Source edit, validate, debug, and publish
VibeX Office	Skills, workflows, and read-only preview for DOCX / XLSX / PPTX
Plugin Development	Local SDK / CLI and optional development MCP; everyday use can leave it off

Delivery

Official MCP ships with the Host family. After the plugin is enabled, the Host injects the matching MCP into later new or rebound agent sessions and trims tools/list per session. Conversations already open keep the tool list from creation.

The four Session Enhance tools can be turned off individually in plugin config. Multi-agent enablement is delegation enablement. Workflow Creator depends on the running Host loopback gateway. Office preview uses the Host-locked officecli Runtime.

Config writes each package’s config.json and applies to later new sessions or new previews.

Relation to Settings

Session tools and the delegation master switch live on those plugins’ Config tabs. Settings → General leaves those switches on the plugin pages. Office preview idle timeout and Workflow Creator’s default completion policy also live in each package config.