95 lines
6.2 KiB
Markdown
95 lines
6.2 KiB
Markdown
---
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id: 20260603-122317-plugin-feature-contribution-registry
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slug: plugin-feature-contribution-registry
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title: Plugin: feature contribution registry for built-in and external capabilities
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status: closed
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kind: feature
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priority: P1
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labels: [plugin, registry, tools, hooks, orchestration]
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created_at: 2026-06-03T12:23:17Z
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updated_at: 2026-06-04T22:26:37Z
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assignee: null
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legacy_ticket: null
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---
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## Issue
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Yoi already has many capability surfaces: built-in tools, memory tools, Pod management tools, manifest permission hooks, workflow assets, notifications, and planned WorkItem / MCP / plugin features. If new features keep registering themselves through ad hoc Pod/Worker code paths, Plugin system work will not produce a single management boundary and later features such as WorkItem intake will be hard to detach.
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The immediate need is not package distribution or WASM execution. The immediate need is a runtime feature contribution registry that lets built-in features and future external plugins contribute through the same existing host surfaces: Tools, Hooks, host-managed BackgroundTasks, host-mediated Services, and durable notification/history plus alert/diagnostic paths.
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## Direction
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Introduce a feature registry boundary for Pod runtime contribution installation and host-authority grants.
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- Feature state remains owned by the feature/extension module, not by Pod history or prompt context.
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- Pod interaction happens through existing surfaces:
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- Tool contributions registered into the normal ToolRegistry / permission / history path.
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- Hook contributions registered through the public Pod Hook boundary.
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- BackgroundTask contributions are host-managed for async feature work; feature modules must not create untracked runtime loops.
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- Service provider/consumer declarations allow a feature/plugin to expose a narrow public API and another feature/plugin to acquire it through host dependency resolution and host-authority grants where the service exposes host authority.
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- Model-visible notifications use the existing durable Notify / SystemItem / Event::SystemItem path rather than invisible context injection.
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- Transient human-facing alerts and diagnostics are separate host-defined outputs, not arbitrary plugin UI channels.
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- The registry is responsible for discovery/enablement diagnostics and installation into existing surfaces; it must not create a parallel execution path.
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- Built-in features should be expressible as feature contributions first. External plugin runtimes can be added later.
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## Placement note
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The runtime registry should initially live in the Pod layer, e.g. `crates/pod/src/feature.rs` or an equivalent module, because installation requires access to Worker tool registration, Pod Hook registry setup, manifest/profile-resolved policy, notification buffers, and Pod event bridges.
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Pure descriptor types may later move to a separate `plugin` / `extension` crate if needed, but descriptor types must not depend on Pod internals.
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## Requirements
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- Define feature identity/source/runtime metadata for at least built-in features and future user/project plugins.
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- Example sources: builtin, user, project.
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- Example runtime kinds: builtin, declarative, mcp bridge future, wasm future.
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- Define contribution descriptors or install abstractions for:
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- Tools
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- Hooks
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- BackgroundTasks
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- Service providers and service requirements
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- Model-visible notification, transient alert, and diagnostic surfaces where needed
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- Define host-authority request / grant data structures suitable for user approval and policy diagnostics. Tool/Hook/BackgroundTask/ServiceProvider declarations are contributions to display and lock by descriptor/digest, not separate sandbox authorities.
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- Add a registry/builder/install context that can install enabled feature contributions into existing Pod/Worker surfaces.
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- Preserve current behavior while moving registration toward the registry.
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- Existing built-in tool registration must still work.
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- Existing manifest permission hook behavior must still work.
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- Existing notification/history invariants must still hold.
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- Keep model-visible plugin/feature output on durable paths: tool result, committed history, or explicit notification/history append paths.
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- Do not let feature contributions mutate session history, memory, prompt context, or scope outside approved host APIs.
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- Document how WorkItem tools should become a built-in feature contribution rather than a special Pod context path.
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## Non-goals
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- Implementing WASM execution.
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- Implementing plugin package discovery or archive validation.
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- Implementing MCP itself.
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- Implementing WorkItem management tools.
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- Adding UI/TUI rendering plugins.
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- Auto-enabling user/project plugins.
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## Suggested phases
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1. **Registry design**
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- Define feature descriptor, source, runtime kind, contribution kinds, host-authority request/grant, and diagnostics.
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2. **Pod runtime registry skeleton**
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- Add a Pod-layer feature registry/builder and install context.
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- Keep behavior unchanged initially.
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3. **Builtin registration migration**
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- Move a small, low-risk built-in feature group through the registry first.
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- Then migrate built-in tool groups / memory / Pod-management registration as appropriate.
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4. **Hook integration**
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- Integrate only after `hook-public-surface-hardening` establishes a safe public Hook action surface.
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5. **Follow-up alignment**
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- Update WorkItem, MCP, and plugin distribution tickets to depend on this registry boundary where they contribute capabilities.
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## Acceptance criteria
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- The codebase has a first-class feature contribution registry boundary for Pod runtime installation.
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- At least one built-in contribution group is registered through the new registry without changing behavior.
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- The registry can describe Tool, Hook, BackgroundTask, and Service provider/requirement contributions and records source/runtime/authority diagnostics.
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- Feature installation uses existing ToolRegistry, HookRegistry, host-managed BackgroundTask lifecycle, host-mediated Service resolution, and notification/history paths; no parallel Pod context injection path or arbitrary plugin UI channel is introduced.
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- WorkItem and MCP follow-up tickets can target this registry instead of adding ad hoc registration code.
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- Focused tests cover the migrated built-in registration and authority/diagnostic behavior.
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