---
id: IHUB-WP-0011
type: workplan
title: "IHF Phase 10 — Hub Registry and Widget Marketplace"
domain: inter_hub
repo: inter-hub
status: done
owner: custodian
topic_slug: inter_hub
created: "2026-04-01"
updated: "2026-04-01"
state_hub_sync: done
state_hub_workstream_id: "bc81e097-e91c-4750-80b6-c809ebcf7ef9"
---

# IHF Phase 10 — Hub Registry and Widget Marketplace

## Goal

Enable reuse of proven widget patterns, governance templates, and hub
configurations across deployments. Phase 9 made the IHF externally consumable.
Phase 10 makes it composable: hubs and widgets can be discovered, rated,
adopted, and evolved as shared platform assets.

## Background

Phases 1–9 and IHUB-WP-0009 (GAAF Compliance Foundation) are complete. All
Phase 10 entry gates are satisfied:

- `HubCapabilityManifest` table and activation workflow operational ✓
- Four type registries seeded and validated ✓
- `/api/v2/` REST API with OpenAPI 3.1 spec live ✓
- `HubHealthSnapshot` data available ✓
- ARCHITECTURE-LAYERS.md scorecard at 3.41 (approaching Strong) ✓
- Architectural fitness functions in CI ✓

Phase 10's Hub Registry IS the `HubCapabilityManifest` table with a public-facing
discovery UI. No new hub registry table is required. The data already exists;
Phase 10 adds browsability, pattern publishing, and adoption mechanics.

Reference: `specs/InteractionHubFrameworkSpecification_v0.2.md` §Phase 10.

## GAAF Architectural Constraints

All new code in this workplan must comply with:

1. **No bare TEXT type discriminators** — any new type discriminator column must
   FK to a registry table or carry a CHECK constraint.
2. **WidgetPattern.widget_type must FK to widget_type_registry** — no unregistered
   widget types may be referenced by a pattern.
3. **GovernanceTemplate categories must FK to annotation_category_registry** —
   template categories are registered vocabulary, not free text.
4. **Core tables are frozen** — `widgets`, `interaction_events`, `annotations`,
   `hubs`, and Phase 1–4 dependents must not gain columns without a corresponding
   `/contracts/core/` update.
5. **Append-only invariant is permanent** — no migration may add UPDATE or DELETE
   capability to `interaction_events` or `outcome_signals`.
6. **Manifest amendment is the extension mechanism** — when a hub adopts a pattern
   or governance template that introduces new types, those types must be added to
   the hub's `HubCapabilityManifest` via a draft amendment, not inserted directly
   into the registry.

## Data Artifacts Introduced

`WidgetPattern`, `WidgetPatternVersion`, `PatternAdoption`, `GovernanceTemplate`,
`GovernanceTemplateClone`

Note: No `HubRegistry` table — the hub registry is a view over existing
`hub_capability_manifests`, `hub_health_snapshots`, and `hubs` tables.

Schema additions:

```sql
-- widget_patterns: reusable widget definitions tied to registered types
CREATE TABLE widget_patterns (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    hub_id UUID NOT NULL REFERENCES hubs(id),
    name TEXT NOT NULL,
    description TEXT,
    widget_type TEXT NOT NULL REFERENCES widget_type_registry(name),
    is_cross_hub BOOLEAN NOT NULL DEFAULT FALSE,
    is_published BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL
);

-- widget_pattern_versions: explicit version history
CREATE TABLE widget_pattern_versions (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    widget_pattern_id UUID NOT NULL REFERENCES widget_patterns(id) ON DELETE CASCADE,
    version_number INTEGER NOT NULL,
    definition JSONB NOT NULL,  -- widget envelope definition snapshot
    changelog TEXT,
    published_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
    UNIQUE (widget_pattern_id, version_number)
);

-- pattern_adoptions: which hubs have adopted which patterns
CREATE TABLE pattern_adoptions (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    widget_pattern_id UUID NOT NULL REFERENCES widget_patterns(id),
    adopting_hub_id UUID NOT NULL REFERENCES hubs(id),
    pinned_version_id UUID REFERENCES widget_pattern_versions(id),
    is_version_pinned BOOLEAN NOT NULL DEFAULT FALSE,
    is_anonymous BOOLEAN NOT NULL DEFAULT FALSE,  -- opt-out of aggregate feedback
    adopted_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
    UNIQUE (widget_pattern_id, adopting_hub_id)
);

-- governance_templates: requirement distillation and decision templates
CREATE TABLE governance_templates (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    hub_id UUID NOT NULL REFERENCES hubs(id),
    name TEXT NOT NULL,
    description TEXT,
    -- categories: array of annotation_category_registry names this template uses
    -- Stored as JSONB array; each element must exist in annotation_category_registry
    categories JSONB NOT NULL DEFAULT '[]',
    template_body JSONB NOT NULL,  -- structured template definition
    is_published BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL
);

-- governance_template_clones: adoption record for governance templates
CREATE TABLE governance_template_clones (
    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
    governance_template_id UUID NOT NULL REFERENCES governance_templates(id),
    cloning_hub_id UUID NOT NULL REFERENCES hubs(id),
    cloned_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() NOT NULL,
    UNIQUE (governance_template_id, cloning_hub_id)
);
```

---

## Tasks

### T01 — Schema: WidgetPattern, WidgetPatternVersion, PatternAdoption, GovernanceTemplate, GovernanceTemplateClone

```task
id: IHUB-WP-0011-T01
status: done
priority: high
state_hub_task_id: "9c26859d-d910-4c5d-a684-3d94ea8019d9"
```

Add all Phase 10 tables to `Application/Schema.sql` and write a migration.

**GAAF constraints:**
- `widget_patterns.widget_type` must FK to `widget_type_registry(name)` — not
  TEXT, not CHECK, but a true FK to the registry
- `governance_templates.categories` is JSONB; validate each element against
  `annotation_category_registry` in the controller layer (array FK not expressible
  in SQL; controller validates at write time)
- No `HubRegistry` table — registry is a query over existing tables

**Migration file:** `Application/Migration/<timestamp>-ihf-phase10-hub-registry.sql`

Run `migrate` after writing.

---

### T02 — Hub Registry UI: browsable view over manifests + health snapshots + GAAF compliance indicator

```task
id: IHUB-WP-0011-T02
status: done
priority: high
state_hub_task_id: "718b93a7-4e0a-4f79-af15-53af13ef9a92"
```

**Controller:** `Web/Controller/HubRegistry.hs`

**Query:**
```sql
SELECT h.id, h.name, h.hub_kind, h.domain,
       m.id AS manifest_id, m.status AS manifest_status,
       m.declared_widget_types, m.declared_event_types,
       m.declared_annotation_categories, m.declared_policy_scopes,
       s.overall_score, s.snapshot_taken_at
FROM hubs h
LEFT JOIN hub_capability_manifests m
    ON m.hub_id = h.id AND m.status = 'active'
LEFT JOIN LATERAL (
    SELECT overall_score, snapshot_taken_at
    FROM hub_health_snapshots
    WHERE hub_id = h.id
    ORDER BY snapshot_taken_at DESC LIMIT 1
) s ON TRUE
ORDER BY h.name
```

**GAAF compliance indicator per hub:**
- Has active manifest: `manifest_status = 'active'`
- Registered type count: length of each `declared_*` JSONB array
- Fitness function status: derive from `m.declared_widget_types` completeness
  (flag if hub has widgets not in registry — approximate; full check is in CI)

**Views:** `Web/View/HubRegistry/Index.hs`, `Web/View/HubRegistry/Show.hs`
(Show renders full manifest vocabulary + health history + adopted patterns)

Add route and nav link.

---

### T03 — Widget Pattern Library: publish, list, show with version history

```task
id: IHUB-WP-0011-T03
status: done
priority: high
state_hub_task_id: "5d2ce269-25de-4251-afae-0478901f85f6"
```

**Controller:** `Web/Controller/WidgetPatterns.hs`

Actions:
- `WidgetPatternsAction` — list all published patterns with adopter count
- `ShowWidgetPatternAction { widgetPatternId }` — detail with version history
- `NewWidgetPatternAction` — form (hub selector, widget_type from registry)
- `CreateWidgetPatternAction` — validate `widget_type` exists in
  `widget_type_registry`; if owned by a different hub, set `is_cross_hub = True`
- `EditWidgetPatternAction { widgetPatternId }` / `UpdateWidgetPatternAction`
- `PublishWidgetPatternAction { widgetPatternId }` — set `is_published = True`,
  creates first `WidgetPatternVersion` with `version_number = 1`

**Cross-hub type check:**
```haskell
typeOwner <- query @WidgetTypeRegistry
    |> filterWhere (#name, pattern.widgetType)
    |> fetchOne
let isCrossHub = typeOwner.hubId /= Just pattern.hubId
```

**Views:** `Web/View/WidgetPatterns/{Index,Show,New,Edit}.hs`

---

### T04 — Pattern versioning: WidgetPatternVersion with pin/follow-latest per adoption

```task
id: IHUB-WP-0011-T04
status: done
priority: medium
state_hub_task_id: "33003835-48fd-45d1-addd-75db85340968"
```

**Actions to add to `WidgetPatterns` controller:**

- `PublishNewVersionAction { widgetPatternId }` — form asks for `definition`
  (JSONB) and `changelog`; increments `version_number`; creates
  `WidgetPatternVersion` record
- Show page lists all versions in descending order

**Adoption version choice:**

In `AdoptPatternAction` (T05), offer two options:
1. Follow latest — `is_version_pinned = False`, `pinned_version_id = Nothing`
2. Pin to current — `is_version_pinned = True`, `pinned_version_id = currentVersionId`

Show pinned vs follow-latest status in the adopter hub's pattern list.

---

### T05 — Pattern adoption workflow: adopt pattern, trigger manifest amendment draft

```task
id: IHUB-WP-0011-T05
status: done
priority: high
state_hub_task_id: "44b354ac-b94a-4c71-9c43-79f5e67f671f"
```

**Action:** `AdoptPatternAction { widgetPatternId }` in `WidgetPatterns` controller.

```haskell
-- 1. Resolve adopting hub (from session user's hub)
-- 2. Create PatternAdoption record
adoption <- newRecord @PatternAdoption
    |> set #widgetPatternId widgetPatternId
    |> set #adoptingHubId hubId
    |> set #isAnonymous (param "isAnonymous")
    |> createRecord

-- 3. Check if pattern's widget_type is in the hub's manifest
manifest <- query @HubCapabilityManifest
    |> filterWhere (#hubId, hubId)
    |> filterWhere (#status, "active")
    |> fetchOneOrNothing

let needsAmendment = case manifest of
        Nothing -> True
        Just m  -> not (pattern.widgetType `elem` m.declaredWidgetTypes)

-- 4. If amendment needed, create draft manifest
when needsAmendment $ do
    let newTypes = maybe [pattern.widgetType]
                         (\m -> m.declaredWidgetTypes ++ [pattern.widgetType])
                         manifest
    _draft <- newRecord @HubCapabilityManifest
        |> set #hubId hubId
        |> set #status "draft"
        |> set #declaredWidgetTypes newTypes
        -- ... carry over other declared types from existing manifest
        |> createRecord
    setSuccessMessage "Pattern adopted. A manifest amendment draft has been created — please review and activate it."
    redirectTo (ShowHubCapabilityManifestAction draftId)
```

When no amendment is needed, redirect to hub's pattern list with success message.

---

### T06 — Governance Template Library: CRUD and clone with manifest amendment

```task
id: IHUB-WP-0011-T06
status: done
priority: medium
state_hub_task_id: "f31b86d3-573e-4a87-b179-609872565b0c"
```

**Controller:** `Web/Controller/GovernanceTemplates.hs`

Actions:
- `GovernanceTemplatesAction` — list published templates with clone count
- `ShowGovernanceTemplateAction { governanceTemplateId }` — detail with clones
- `NewGovernanceTemplateAction` / `CreateGovernanceTemplateAction` — validate
  each category in the `categories` JSONB array exists in
  `annotation_category_registry`
- `CloneGovernanceTemplateAction { governanceTemplateId }` — creates
  `GovernanceTemplateClone`; checks each template category against the cloning
  hub's `declared_annotation_categories`; if any missing, creates manifest
  amendment draft with the new categories added

**Category validation helper:**
```haskell
validateCategories :: [Text] -> IO (Either [Text] ())
validateCategories cats = do
    registered <- query @AnnotationCategoryRegistry
        |> filterWhere (#isActive, True)
        |> fetch
    let known = map (.name) registered
    let unknown = filter (`notElem` known) cats
    pure $ if null unknown then Right () else Left unknown
```

**Views:** `Web/View/GovernanceTemplates/{Index,Show,New}.hs`

---

### T07 — Adoption tracking and aggregate friction/outcome view per pattern

```task
id: IHUB-WP-0011-T07
status: done
priority: medium
state_hub_task_id: "5642dd12-4255-42d7-9411-63e032cc2b57"
```

**On pattern Show page**, add aggregate panel (only for non-anonymous adopters):

```sql
SELECT
    COUNT(pa.id)                          AS adopter_count,
    AVG(fs.score)                         AS mean_friction_score,
    COUNT(os.id)                          AS outcome_signal_count
FROM pattern_adoptions pa
JOIN widgets w
    ON w.hub_id = pa.adopting_hub_id
    AND w.widget_type = ?  -- pattern's widget_type
LEFT JOIN friction_scores fs
    ON fs.widget_id = w.id
LEFT JOIN outcome_signals os
    ON os.widget_id = w.id
WHERE pa.widget_pattern_id = ?
  AND pa.is_anonymous = FALSE
```

Show:
- Adopter count (total, including anonymous)
- Mean friction score across non-anonymous adopter hubs (NULL if none)
- Outcome signal count
- "N hubs opted out of aggregate feedback" note if `is_anonymous` count > 0

**Hub's adopted patterns list** (`Web/View/HubRegistry/Show.hs`): list all
`PatternAdoption` records for the hub with pinned/follow-latest status.

---

### T08 — Marketplace dashboard: search and browse patterns and templates

```task
id: IHUB-WP-0011-T08
status: done
priority: medium
state_hub_task_id: "01ea4d7d-cbd3-4149-b772-7e131f4f7e9c"
```

**Controller:** `Web/Controller/MarketplaceDashboard.hs`

Use `autoRefresh`. Two sections:

**Widget Patterns:**
- Full-text search: `WHERE to_tsvector('english', wp.name || ' ' || COALESCE(wp.description,'')) @@ plainto_tsquery(?)`
- Filter by `widget_type` (dropdown from `widget_type_registry`)
- Sort: Most adopted (default) | Recently published | Alphabetical
- Trending: most `pattern_adoptions` created in last 30 days

**Governance Templates:**
- Same search pattern over `governance_templates.name + description`
- Filter by category
- Sort: Most cloned | Recent | Alphabetical

**Layout:** Two-column tab layout (Widget Patterns | Governance Templates).
Hub Registry link at top of page.

**Views:** `Web/View/MarketplaceDashboard/Show.hs`

Add route and nav link ("Marketplace").

---

### T09 — API v2: hub registry and widget pattern endpoints

```task
id: IHUB-WP-0011-T09
status: done
priority: medium
state_hub_task_id: "34d3339a-cf17-4475-b848-eeb077ede8e6"
```

Add to `/api/v2/` surface (all behind `requireApiConsumer` + `checkRateLimitAndLog`):

**Endpoints:**

| Method | Path | Description |
|---|---|---|
| GET | `/api/v2/hub-registry` | List hubs with active manifest summary + GAAF indicator |
| GET | `/api/v2/hub-registry/:hubId` | Single hub detail (manifest vocabulary, health) |
| GET | `/api/v2/widget-patterns` | List published patterns (paginated) |
| GET | `/api/v2/widget-patterns/:id` | Pattern detail with version history |
| POST | `/api/v2/widget-patterns/:id/adopt` | Create PatternAdoption for authenticated consumer's hub |

**New controllers:**
- `Web/Controller/Api/V2/HubRegistry.hs`
- `Web/Controller/Api/V2/WidgetPatterns.hs`

**OpenAPI update:** Add paths to `Web/Controller/Api/V2/OpenApi.hs`. The
`widget_type` enum in widget pattern responses continues to reference the live
registry query (no hardcoding).

**Routes and Types:** Update `Web/Routes.hs` and `Web/Types.hs` for new actions.

---

### T10 — ARCHITECTURE-LAYERS.md scorecard update + exit criteria validation

```task
id: IHUB-WP-0011-T10
status: done
priority: medium
state_hub_task_id: "9af8cd05-7864-438d-92a2-052d0af3bcbc"
```

**Exit criteria checklist (from v0.2 spec §Phase 10):**

- [ ] Hub registry renders all registered hubs with active manifest vocabulary
      and current health score
- [ ] Widget pattern library lists published patterns with version history;
      each pattern's widget_type links to its registry entry
- [ ] A pattern can be published from one hub and adopted into another;
      adoption triggers manifest amendment draft when new types are introduced
- [ ] Adoption tracking shows which hubs use which patterns
- [ ] Governance template cloning works end-to-end; new categories appear in
      the adopting hub's manifest amendment
- [ ] Marketplace dashboard renders search and browse
- [ ] Hub registry GAAF compliance indicator renders correctly for all hubs

**Scorecard updates:**

Phase 10's primary improvement target is the **Customization layer** (currently
2.5 → target ≥3.0): the manifest amendment workflow (T05, T06) constitutes a
formal per-hub configuration contract with migration support, which is the
specific criterion for Customization improvement.

Overall target: ≥3.5 (Strong).

**CLAUDE.md updates:**
- Move IHUB-WP-0011 to completed list
- Set active workplan to IHUB-WP-0012 (Phase 11 — Advanced AI Federation)
- Update "Current state" description

**Commit all changes** and mark workplan `status: done`.