feat(cloud): provision workspace model catalog

src/langbot/pkg/api/http/service/model.py

@@ -5,6 +5,7 @@ import uuid
 import sqlalchemy
 from langbot_plugin.api.entities.builtin.provider import message as provider_message
 
+from ....cloud.model_catalog import LANGBOT_MODELS_PROVIDER_REQUESTER
 from ....core import app
 from ....entity.persistence import model as persistence_model
 from ....entity.persistence import pipeline as persistence_pipeline
@@ -113,6 +114,23 @@ async def _require_workspace_provider(
     return provider
 
 
+def _is_cloud_runtime(ap: app.Application) -> bool:
+    mode = getattr(ap.persistence_mgr, 'mode', None)
+    return getattr(mode, 'value', None) == 'cloud_runtime'
+
+
+async def _assert_cloud_managed_provider_mutable(
+    ap: app.Application,
+    context: TenantContext,
+    provider_uuid: str,
+) -> None:
+    if not _is_cloud_runtime(ap):
+        return
+    provider = await _require_workspace_provider(ap, context, provider_uuid)
+    if provider.get('requester') == LANGBOT_MODELS_PROVIDER_REQUESTER:
+        raise ValueError('LangBot Models is managed by Cloud and cannot be modified')
+
+
 async def _require_runtime_provider(
     ap: app.Application,
     context: TenantContext,
@@ -213,6 +231,7 @@ class LLMModelsService:
                 model_data['provider_uuid'] = provider_uuid
 
         await _require_workspace_provider(self.ap, context, model_data['provider_uuid'])
+        await _assert_cloud_managed_provider_mutable(self.ap, context, model_data['provider_uuid'])
         await _validate_provider_supports(self.ap, context, model_data['provider_uuid'], 'llm')
 
         await self.ap.persistence_mgr.execute_async(sqlalchemy.insert(persistence_model.LLMModel).values(**model_data))
@@ -291,11 +310,17 @@ class LLMModelsService:
 
         return model_dict
 
-    async def update_llm_model(self, context: TenantContext, model_uuid: str, model_data: dict) -> None:
+    async def update_llm_model(
+        self,
+        context: TenantContext,
+        model_uuid: str,
+        model_data: dict,
+    ) -> None:
         """Update an existing LLM model"""
         existing_model = await self.get_llm_model(context, model_uuid, include_secret=True)
         if existing_model is None:
             raise WorkspaceNotFoundError('Model not found')
+        await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         model_data = model_data.copy()
         model_data.pop('uuid', None)
         model_data.pop('workspace_uuid', None)
@@ -321,6 +346,7 @@ class LLMModelsService:
 
         provider_uuid = model_data.get('provider_uuid', existing_model['provider_uuid'])
         await _require_workspace_provider(self.ap, context, provider_uuid)
+        await _assert_cloud_managed_provider_mutable(self.ap, context, provider_uuid)
         await _validate_provider_supports(self.ap, context, provider_uuid, 'llm')
 
         result = await self.ap.persistence_mgr.execute_async(
@@ -355,6 +381,11 @@ class LLMModelsService:
 
     async def delete_llm_model(self, context: TenantContext, model_uuid: str) -> None:
         """Delete an LLM model"""
+        if _is_cloud_runtime(self.ap):
+            existing_model = await self.get_llm_model(context, model_uuid, include_secret=True)
+            if existing_model is None:
+                raise WorkspaceNotFoundError('Model not found')
+            await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         result = await self.ap.persistence_mgr.execute_async(
             scope_statement(
                 sqlalchemy.delete(persistence_model.LLMModel).where(persistence_model.LLMModel.uuid == model_uuid),
@@ -448,7 +479,10 @@ class EmbeddingModelsService:
         return serialized if include_secret else [_redact_model_secrets(model) for model in serialized]
 
     async def create_embedding_model(
-        self, context: TenantContext, model_data: dict, preserve_uuid: bool = False
+        self,
+        context: TenantContext,
+        model_data: dict,
+        preserve_uuid: bool = False,
     ) -> str:
         """Create a new embedding model"""
         model_data = model_data.copy()
@@ -472,6 +506,7 @@ class EmbeddingModelsService:
                 model_data['provider_uuid'] = provider_uuid
 
         await _require_workspace_provider(self.ap, context, model_data['provider_uuid'])
+        await _assert_cloud_managed_provider_mutable(self.ap, context, model_data['provider_uuid'])
         await _validate_provider_supports(self.ap, context, model_data['provider_uuid'], 'text-embedding')
 
         await self.ap.persistence_mgr.execute_async(
@@ -530,11 +565,17 @@ class EmbeddingModelsService:
 
         return model_dict
 
-    async def update_embedding_model(self, context: TenantContext, model_uuid: str, model_data: dict) -> None:
+    async def update_embedding_model(
+        self,
+        context: TenantContext,
+        model_uuid: str,
+        model_data: dict,
+    ) -> None:
         """Update an existing embedding model"""
         existing_model = await self.get_embedding_model(context, model_uuid, include_secret=True)
         if existing_model is None:
             raise WorkspaceNotFoundError('Model not found')
+        await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         model_data = model_data.copy()
         model_data.pop('uuid', None)
         model_data.pop('workspace_uuid', None)
@@ -559,6 +600,7 @@ class EmbeddingModelsService:
 
         provider_uuid = model_data.get('provider_uuid', existing_model['provider_uuid'])
         await _require_workspace_provider(self.ap, context, provider_uuid)
+        await _assert_cloud_managed_provider_mutable(self.ap, context, provider_uuid)
         await _validate_provider_supports(self.ap, context, provider_uuid, 'text-embedding')
 
         result = await self.ap.persistence_mgr.execute_async(
@@ -593,6 +635,11 @@ class EmbeddingModelsService:
 
     async def delete_embedding_model(self, context: TenantContext, model_uuid: str) -> None:
         """Delete an embedding model"""
+        if _is_cloud_runtime(self.ap):
+            existing_model = await self.get_embedding_model(context, model_uuid, include_secret=True)
+            if existing_model is None:
+                raise WorkspaceNotFoundError('Model not found')
+            await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         result = await self.ap.persistence_mgr.execute_async(
             scope_statement(
                 sqlalchemy.delete(persistence_model.EmbeddingModel).where(
@@ -685,7 +732,12 @@ class RerankModelsService:
         serialized = [self.ap.persistence_mgr.serialize_model(persistence_model.RerankModel, m) for m in models]
         return serialized if include_secret else [_redact_model_secrets(model) for model in serialized]
 
-    async def create_rerank_model(self, context: TenantContext, model_data: dict, preserve_uuid: bool = False) -> str:
+    async def create_rerank_model(
+        self,
+        context: TenantContext,
+        model_data: dict,
+        preserve_uuid: bool = False,
+    ) -> str:
         """Create a new rerank model"""
         model_data = model_data.copy()
         if not preserve_uuid:
@@ -708,6 +760,7 @@ class RerankModelsService:
                 model_data['provider_uuid'] = provider_uuid
 
         await _require_workspace_provider(self.ap, context, model_data['provider_uuid'])
+        await _assert_cloud_managed_provider_mutable(self.ap, context, model_data['provider_uuid'])
         await _validate_provider_supports(self.ap, context, model_data['provider_uuid'], 'rerank')
 
         await self.ap.persistence_mgr.execute_async(
@@ -766,11 +819,17 @@ class RerankModelsService:
 
         return model_dict
 
-    async def update_rerank_model(self, context: TenantContext, model_uuid: str, model_data: dict) -> None:
+    async def update_rerank_model(
+        self,
+        context: TenantContext,
+        model_uuid: str,
+        model_data: dict,
+    ) -> None:
         """Update an existing rerank model"""
         existing_model = await self.get_rerank_model(context, model_uuid, include_secret=True)
         if existing_model is None:
             raise WorkspaceNotFoundError('Model not found')
+        await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         model_data = model_data.copy()
         model_data.pop('uuid', None)
         model_data.pop('workspace_uuid', None)
@@ -795,6 +854,7 @@ class RerankModelsService:
 
         provider_uuid = model_data.get('provider_uuid', existing_model['provider_uuid'])
         await _require_workspace_provider(self.ap, context, provider_uuid)
+        await _assert_cloud_managed_provider_mutable(self.ap, context, provider_uuid)
         await _validate_provider_supports(self.ap, context, provider_uuid, 'rerank')
 
         result = await self.ap.persistence_mgr.execute_async(
@@ -829,6 +889,11 @@ class RerankModelsService:
 
     async def delete_rerank_model(self, context: TenantContext, model_uuid: str) -> None:
         """Delete a rerank model"""
+        if _is_cloud_runtime(self.ap):
+            existing_model = await self.get_rerank_model(context, model_uuid, include_secret=True)
+            if existing_model is None:
+                raise WorkspaceNotFoundError('Model not found')
+            await _assert_cloud_managed_provider_mutable(self.ap, context, existing_model['provider_uuid'])
         result = await self.ap.persistence_mgr.execute_async(
             scope_statement(
                 sqlalchemy.delete(persistence_model.RerankModel).where(

src/langbot/pkg/api/http/service/provider.py

@@ -5,6 +5,7 @@ import traceback
 
 import sqlalchemy
 
+from ....cloud.model_catalog import LANGBOT_MODELS_PROVIDER_REQUESTER
 from ....core import app
 from ....entity.persistence import model as persistence_model
 from ....workspace.errors import WorkspaceNotFoundError
@@ -20,6 +21,20 @@ class ModelProviderService:
     def __init__(self, ap: app.Application) -> None:
         self.ap = ap
 
+    def _is_cloud_runtime(self) -> bool:
+        mode = getattr(self.ap.persistence_mgr, 'mode', None)
+        return getattr(mode, 'value', None) == 'cloud_runtime'
+
+    def _system_requester_is_reserved(self, requester: object) -> bool:
+        return self._is_cloud_runtime() and requester == LANGBOT_MODELS_PROVIDER_REQUESTER
+
+    async def _assert_provider_mutable(self, context: TenantContext, provider_uuid: str) -> None:
+        if not self._is_cloud_runtime():
+            return
+        provider = await self.get_provider(context, provider_uuid)
+        if provider is not None and self._system_requester_is_reserved(provider.get('requester')):
+            raise ValueError('LangBot Models is managed by Cloud and cannot be modified')
+
     @staticmethod
     def _normalize_api_keys(api_keys: str | list[str] | tuple[str, ...] | None) -> list[str]:
         if api_keys is None:
@@ -99,6 +114,8 @@ class ModelProviderService:
     async def create_provider(self, context: TenantContext, provider_data: dict) -> str:
         """Create a new provider"""
         provider_data = provider_data.copy()
+        if self._system_requester_is_reserved(provider_data.get('requester')):
+            raise ValueError('space-chat-completions is reserved for the Cloud-managed LangBot Models provider')
         provider_data['uuid'] = str(uuid.uuid4())
         provider_data['workspace_uuid'] = require_workspace_uuid(context)
         provider_data['api_keys'] = self._normalize_api_keys(
@@ -115,7 +132,10 @@ class ModelProviderService:
 
     async def update_provider(self, context: TenantContext, provider_uuid: str, provider_data: dict) -> None:
         """Update an existing provider"""
+        await self._assert_provider_mutable(context, provider_uuid)
         provider_data = provider_data.copy()
+        if self._system_requester_is_reserved(provider_data.get('requester')):
+            raise ValueError('space-chat-completions is reserved for the Cloud-managed LangBot Models provider')
         provider_data.pop('uuid', None)
         provider_data.pop('workspace_uuid', None)
         if 'api_keys' in provider_data:
@@ -145,6 +165,7 @@ class ModelProviderService:
 
     async def delete_provider(self, context: TenantContext, provider_uuid: str) -> None:
         """Delete a provider (only if no models reference it)"""
+        await self._assert_provider_mutable(context, provider_uuid)
         workspace_uuid = require_workspace_uuid(context)
         # Check if any models use this provider
         llm_result = await self.ap.persistence_mgr.execute_async(
@@ -245,6 +266,8 @@ class ModelProviderService:
         api_keys: list,
     ) -> str:
         """Find existing provider or create new one"""
+        if self._system_requester_is_reserved(requester):
+            raise ValueError('space-chat-completions is reserved for the Cloud-managed LangBot Models provider')
         workspace_uuid = require_workspace_uuid(context)
         api_keys = self._normalize_api_keys(restore_secret_placeholders(api_keys, sensitive=True))
 

src/langbot/pkg/cloud/bootstrap.py

@@ -13,6 +13,7 @@ from typing import Any, Protocol, runtime_checkable
 from ..workspace.policy import CloudWorkspacePolicy, SingleWorkspacePolicy
 from .directory import DirectoryProjectionProvider, directory_projection_limits_from_config
 from .entitlements import EntitlementProvider, OpenSourceEntitlementProvider
+from .model_catalog import CloudModelCatalogProvider
 
 
 CLOUD_BOOTSTRAP_ENTRY_POINT = 'langbot.cloud_bootstrap'
@@ -50,6 +51,7 @@ class OpenSourceDeployment:
     )
     directory_provider: None = None
     manifest_provider: None = None
+    model_catalog_provider: None = None
     persistence_mode: str = 'oss_compat'
     required_vector_backend: str | None = None
 
@@ -80,6 +82,7 @@ class VerifiedCloudDeployment:
     entitlement_provider: EntitlementProvider
     directory_provider: DirectoryProjectionProvider
     manifest_provider: CloudManifestProvider
+    model_catalog_provider: CloudModelCatalogProvider
     verification_key_id: str
     mode: str = dataclasses.field(default='cloud', init=False)
     workspace_policy: CloudWorkspacePolicy = dataclasses.field(default_factory=CloudWorkspacePolicy, init=False)
@@ -110,6 +113,8 @@ class VerifiedCloudDeployment:
             raise CloudBootstrapError('Verified Cloud bootstrap did not provide a directory adapter')
         if not isinstance(self.manifest_provider, CloudManifestProvider):
             raise CloudBootstrapError('Verified Cloud bootstrap did not provide a Manifest renewal adapter')
+        if not isinstance(self.model_catalog_provider, CloudModelCatalogProvider):
+            raise CloudBootstrapError('Verified Cloud bootstrap did not provide a model catalog adapter')
 
     def validate_instance_config(self, config: dict[str, Any]) -> None:
         try:

src/langbot/pkg/cloud/model_catalog.py

@@ -0,0 +1,284 @@
+from __future__ import annotations
+
+import asyncio
+import uuid
+from datetime import datetime
+from typing import Any, Literal, Protocol, runtime_checkable
+
+import sqlalchemy
+from pydantic import BaseModel, ConfigDict, Field, SecretStr, field_validator
+
+from ..entity.persistence import model as persistence_model
+
+
+LANGBOT_MODELS_PROVIDER_REQUESTER = 'space-chat-completions'
+LANGBOT_MODELS_PROVIDER_NAME = 'LangBot Models'
+_MODEL_RESOURCE_NAMESPACE = uuid.UUID('94c703ca-1df5-4e91-bcd3-74ac65cb7921')
+_SUPPORTED_CATEGORIES = {'chat', 'embedding', 'rerank'}
+_MODEL_TABLES = (
+    persistence_model.LLMModel,
+    persistence_model.EmbeddingModel,
+    persistence_model.RerankModel,
+)
+
+
+class CloudModelCatalogItem(BaseModel):
+    model_config = ConfigDict(extra='forbid', frozen=True)
+
+    uuid: str = Field(min_length=1, max_length=255)
+    model_id: str = Field(min_length=1, max_length=255)
+    category: Literal['chat', 'embedding', 'rerank']
+    llm_abilities: tuple[str, ...] = ()
+    is_featured: bool = False
+    featured_order: int = 0
+
+    @field_validator('llm_abilities')
+    @classmethod
+    def validate_abilities(cls, value: tuple[str, ...]) -> tuple[str, ...]:
+        if any(not item.strip() or len(item) > 64 for item in value):
+            raise ValueError('Model abilities must be non-empty strings of at most 64 characters')
+        if len(set(value)) != len(value):
+            raise ValueError('Model abilities must be unique')
+        return value
+
+
+class CloudWorkspaceModelBilling(BaseModel):
+    model_config = ConfigDict(extra='forbid', frozen=True)
+
+    workspace_uuid: str = Field(min_length=36, max_length=36)
+    owner_account_uuid: str | None = Field(default=None, min_length=36, max_length=36)
+    api_key: SecretStr | None = None
+
+    @field_validator('workspace_uuid')
+    @classmethod
+    def validate_uuid(cls, value: str) -> str:
+        return str(uuid.UUID(value))
+
+    @field_validator('owner_account_uuid')
+    @classmethod
+    def validate_optional_uuid(cls, value: str | None) -> str | None:
+        return None if value is None else str(uuid.UUID(value))
+
+
+class CloudModelCatalogSnapshot(BaseModel):
+    model_config = ConfigDict(extra='forbid', frozen=True)
+
+    instance_uuid: str = Field(min_length=1, max_length=255)
+    generated_at: datetime
+    base_url: str = Field(min_length=1, max_length=512)
+    models: tuple[CloudModelCatalogItem, ...]
+    workspaces: tuple[CloudWorkspaceModelBilling, ...]
+
+    @field_validator('base_url')
+    @classmethod
+    def validate_base_url(cls, value: str) -> str:
+        normalized = value.rstrip('/')
+        if not normalized.startswith('https://'):
+            raise ValueError('Cloud model gateway base URL must use HTTPS')
+        return normalized
+
+    @field_validator('models')
+    @classmethod
+    def validate_models(cls, value: tuple[CloudModelCatalogItem, ...]) -> tuple[CloudModelCatalogItem, ...]:
+        if len(value) > 500:
+            raise ValueError('Cloud model catalog exceeds 500 models')
+        identities = {(item.category, item.uuid) for item in value}
+        if len(identities) != len(value):
+            raise ValueError('Cloud model catalog contains duplicate model identities')
+        return value
+
+    @field_validator('workspaces')
+    @classmethod
+    def validate_workspaces(
+        cls, value: tuple[CloudWorkspaceModelBilling, ...]
+    ) -> tuple[CloudWorkspaceModelBilling, ...]:
+        if len(value) > 10_000:
+            raise ValueError('Cloud model catalog exceeds 10000 Workspaces')
+        identities = {item.workspace_uuid for item in value}
+        if len(identities) != len(value):
+            raise ValueError('Cloud model catalog contains duplicate Workspaces')
+        return value
+
+
+@runtime_checkable
+class CloudModelCatalogProvider(Protocol):
+    async def fetch_model_catalog(self, instance_uuid: str) -> CloudModelCatalogSnapshot:
+        """Fetch and verify the complete model catalog and Workspace billing projection."""
+        ...
+
+
+def system_provider_uuid(workspace_uuid: str) -> str:
+    workspace = str(uuid.UUID(workspace_uuid))
+    return str(uuid.uuid5(_MODEL_RESOURCE_NAMESPACE, f'{workspace}:provider:{LANGBOT_MODELS_PROVIDER_REQUESTER}'))
+
+
+def system_model_uuid(workspace_uuid: str, category: str, upstream_uuid: str) -> str:
+    workspace = str(uuid.UUID(workspace_uuid))
+    if category not in _SUPPORTED_CATEGORIES:
+        raise ValueError(f'Unsupported model category: {category}')
+    if not upstream_uuid:
+        raise ValueError('Upstream model UUID is required')
+    return str(uuid.uuid5(_MODEL_RESOURCE_NAMESPACE, f'{workspace}:model:{category}:{upstream_uuid}'))
+
+
+class CloudModelCatalogSyncService:
+    """Reconcile Space-owned model catalog and Owner billing tokens into every Cloud Workspace."""
+
+    def __init__(
+        self,
+        ap: Any,
+        provider: CloudModelCatalogProvider,
+        instance_uuid: str,
+        *,
+        sync_interval_seconds: float = 3600.0,
+    ) -> None:
+        if not isinstance(provider, CloudModelCatalogProvider):
+            raise TypeError('Cloud model catalog sync requires a CloudModelCatalogProvider')
+        if sync_interval_seconds < 10:
+            raise ValueError('Cloud model catalog sync interval must be at least 10 seconds')
+        self.ap = ap
+        self.provider = provider
+        self.instance_uuid = instance_uuid
+        self.sync_interval_seconds = float(sync_interval_seconds)
+
+    async def initialize(self) -> None:
+        await self.sync_once(reload_runtime=False)
+
+    async def run(self) -> None:
+        while True:
+            await asyncio.sleep(self.sync_interval_seconds)
+            try:
+                await self.sync_once(reload_runtime=True)
+            except asyncio.CancelledError:
+                raise
+            except Exception as exc:
+                self.ap.logger.warning(f'Cloud model catalog synchronization failed: {exc}')
+
+    async def sync_once(self, *, reload_runtime: bool = True) -> dict[str, int]:
+        snapshot = await self.provider.fetch_model_catalog(self.instance_uuid)
+        if snapshot.instance_uuid != self.instance_uuid:
+            raise ValueError('Cloud model catalog targets another LangBot instance')
+
+        bindings = await self.ap.workspace_service.list_active_execution_bindings()
+        billing_by_workspace = {item.workspace_uuid: item for item in snapshot.workspaces}
+        missing = sorted(
+            binding.workspace_uuid for binding in bindings if binding.workspace_uuid not in billing_by_workspace
+        )
+        if missing:
+            raise ValueError(f'Cloud model catalog is missing billing projections for {len(missing)} active Workspaces')
+
+        summary = {'workspaces': 0, 'created': 0, 'updated': 0, 'deleted': 0}
+        changed = False
+        for binding in bindings:
+            counts = await self._sync_workspace(
+                binding.workspace_uuid,
+                snapshot,
+                billing_by_workspace[binding.workspace_uuid],
+            )
+            summary['workspaces'] += 1
+            for key in ('created', 'updated', 'deleted'):
+                summary[key] += counts[key]
+                changed = changed or counts[key] > 0
+
+        if changed and reload_runtime and getattr(self.ap, 'model_mgr', None) is not None:
+            await self.ap.model_mgr.load_models_from_db()
+        if changed:
+            self.ap.logger.info(
+                'Cloud model catalog synchronized '
+                f'({summary["workspaces"]} Workspaces, {len(snapshot.models)} models, '
+                f'created={summary["created"]}, updated={summary["updated"]}, deleted={summary["deleted"]})'
+            )
+        return summary
+
+    async def _sync_workspace(
+        self,
+        workspace_uuid: str,
+        snapshot: CloudModelCatalogSnapshot,
+        billing: CloudWorkspaceModelBilling,
+    ) -> dict[str, int]:
+        counts = {'created': 0, 'updated': 0, 'deleted': 0}
+        provider_uuid = system_provider_uuid(workspace_uuid)
+        desired_keys = [billing.api_key.get_secret_value()] if billing.api_key is not None else []
+
+        async with self.ap.persistence_mgr.tenant_uow(workspace_uuid) as uow:
+            provider = await uow.session.scalar(
+                sqlalchemy.select(persistence_model.ModelProvider).where(
+                    persistence_model.ModelProvider.uuid == provider_uuid
+                )
+            )
+            provider_values = {
+                'workspace_uuid': workspace_uuid,
+                'name': LANGBOT_MODELS_PROVIDER_NAME,
+                'requester': LANGBOT_MODELS_PROVIDER_REQUESTER,
+                'base_url': snapshot.base_url,
+                'api_keys': desired_keys,
+            }
+            if provider is None:
+                provider = persistence_model.ModelProvider(uuid=provider_uuid, **provider_values)
+                uow.session.add(provider)
+                await uow.session.flush()
+                counts['created'] += 1
+            elif self._update_entity(provider, provider_values):
+                counts['updated'] += 1
+
+            existing_by_table: dict[type, dict[str, Any]] = {}
+            for table in _MODEL_TABLES:
+                rows = (
+                    await uow.session.scalars(sqlalchemy.select(table).where(table.provider_uuid == provider_uuid))
+                ).all()
+                existing_by_table[table] = {row.uuid: row for row in rows}
+
+            desired_ids: dict[type, set[str]] = {table: set() for table in _MODEL_TABLES}
+            for item in snapshot.models:
+                table, values = self._model_values(workspace_uuid, provider_uuid, item)
+                model_uuid = system_model_uuid(workspace_uuid, item.category, item.uuid)
+                desired_ids[table].add(model_uuid)
+                existing = existing_by_table[table].get(model_uuid)
+                if existing is None:
+                    uow.session.add(table(uuid=model_uuid, **values))
+                    counts['created'] += 1
+                elif self._update_entity(existing, values):
+                    counts['updated'] += 1
+
+            for table, entities in existing_by_table.items():
+                for model_uuid, entity in entities.items():
+                    if model_uuid not in desired_ids[table]:
+                        await uow.session.delete(entity)
+                        counts['deleted'] += 1
+
+        return counts
+
+    @staticmethod
+    def _update_entity(entity: Any, values: dict[str, Any]) -> bool:
+        changed = False
+        for key, value in values.items():
+            if getattr(entity, key) != value:
+                setattr(entity, key, value)
+                changed = True
+        return changed
+
+    @staticmethod
+    def _model_values(
+        workspace_uuid: str,
+        provider_uuid: str,
+        item: CloudModelCatalogItem,
+    ) -> tuple[type, dict[str, Any]]:
+        ranking = 100 - item.featured_order if item.is_featured else 0
+        common = {
+            'workspace_uuid': workspace_uuid,
+            'name': item.model_id,
+            'provider_uuid': provider_uuid,
+            'extra_args': {},
+            'prefered_ranking': ranking,
+        }
+        if item.category == 'chat':
+            return persistence_model.LLMModel, {
+                **common,
+                'abilities': list(item.llm_abilities),
+                'context_length': None,
+            }
+        if item.category == 'embedding':
+            return persistence_model.EmbeddingModel, common
+        if item.category == 'rerank':
+            return persistence_model.RerankModel, common
+        raise ValueError(f'Unsupported model category: {item.category}')

src/langbot/pkg/core/app.py

@@ -54,6 +54,7 @@ from ..cloud import launch as cloud_launch_module
 from ..cloud import support_admin as cloud_support_admin_module
 from ..cloud import directory_projection as cloud_directory_projection_module
 from ..cloud import entitlements as cloud_entitlements_module
+from ..cloud import model_catalog as cloud_model_catalog_module
 from ..api.http.context import ExecutionContext, PrincipalContext, PrincipalType
 
 
@@ -142,13 +143,12 @@ class Application:
     deployment: cloud_bootstrap_module.OpenSourceDeployment | cloud_bootstrap_module.VerifiedCloudDeployment = None
 
     deployment_admission: cloud_bootstrap_module.DeploymentAdmissionGuard = None
-
+    directory_projection_service: cloud_directory_projection_module.DirectoryProjectionService | None = None
+    cloud_model_catalog_service: cloud_model_catalog_module.CloudModelCatalogSyncService | None = None
     manifest_refresh_service: cloud_bootstrap_module.CloudManifestRefreshService | None = None
 
     entitlement_resolver: cloud_entitlements_module.EntitlementResolver | None = None
 
-    directory_projection_service: cloud_directory_projection_module.DirectoryProjectionService | None = None
-
     vector_db_mgr: vectordb_mgr.VectorDBManager = None
 
     http_ctrl: http_controller.HTTPController = None
@@ -306,6 +306,12 @@ class Application:
                     name='cloud-directory-projection',
                     scopes=[core_entities.LifecycleControlScope.APPLICATION],
                 )
+            if self.cloud_model_catalog_service is not None:
+                self.task_mgr.create_task(
+                    self.cloud_model_catalog_service.run(),
+                    name='cloud-model-catalog-sync',
+                    scopes=[core_entities.LifecycleControlScope.APPLICATION],
+                )
             if self.manifest_refresh_service is not None:
                 self.task_mgr.create_task(
                     self.manifest_refresh_service.run(),

src/langbot/pkg/core/stages/build_app.py

@@ -46,6 +46,7 @@ from ...cloud import support_admin as cloud_support_admin_module
 from ...cloud.directory import directory_projection_limits_from_config
 from ...cloud.directory_projection import DirectoryProjectionService
 from ...cloud.entitlements import EntitlementResolver
+from ...cloud.model_catalog import CloudModelCatalogSyncService
 from ...api.http.context import ExecutionContext, PrincipalContext, PrincipalType
 from ...api.http.authz import WorkspaceRequiredError
 
@@ -176,6 +177,16 @@ class BuildAppStage(stage.BootingStage):
             # of repeating tenant validation for every manager.
             await workspace_service_inst.prime_startup_execution_bindings()
 
+            if not isinstance(deployment, cloud_bootstrap.VerifiedCloudDeployment):
+                raise RuntimeError('Multi-Workspace runtime requires a verified Cloud deployment')
+            cloud_model_catalog_service = CloudModelCatalogSyncService(
+                ap,
+                deployment.model_catalog_provider,
+                constants.instance_id,
+            )
+            await cloud_model_catalog_service.initialize()
+            ap.cloud_model_catalog_service = cloud_model_catalog_service
+
         ap.workspace_collaboration_service = workspace_collaboration_module.WorkspaceCollaborationService(
             ap,
             workspace_service_inst,

tests/unit_tests/api/service/test_cloud_managed_model_protection.py

@@ -0,0 +1,112 @@
+"""Cloud Runtime write protection for the managed LangBot Models catalog."""
+
+from types import SimpleNamespace
+from unittest.mock import AsyncMock
+
+import pytest
+
+from langbot.pkg.api.http.service import model as model_service_module
+from langbot.pkg.api.http.service.model import (
+    EmbeddingModelsService,
+    LLMModelsService,
+    RerankModelsService,
+    _assert_cloud_managed_provider_mutable,
+)
+from langbot.pkg.cloud.model_catalog import LANGBOT_MODELS_PROVIDER_REQUESTER
+
+
+WORKSPACE = 'workspace-a'
+PROVIDER = 'managed-provider'
+MODEL = 'managed-model'
+
+
+@pytest.mark.asyncio
+async def test_managed_provider_guard_is_cloud_only(monkeypatch) -> None:
+    async def managed_provider(_ap, _context, provider_uuid):
+        assert provider_uuid == PROVIDER
+        return {'uuid': PROVIDER, 'requester': LANGBOT_MODELS_PROVIDER_REQUESTER}
+
+    monkeypatch.setattr(model_service_module, '_require_workspace_provider', managed_provider)
+    application = SimpleNamespace(persistence_mgr=SimpleNamespace(mode=SimpleNamespace(value='cloud_runtime')))
+
+    with pytest.raises(ValueError, match='managed by Cloud'):
+        await _assert_cloud_managed_provider_mutable(
+            application,
+            WORKSPACE,
+            PROVIDER,
+        )
+
+    application.persistence_mgr.mode.value = 'normal'
+    await _assert_cloud_managed_provider_mutable(
+        application,
+        WORKSPACE,
+        PROVIDER,
+    )
+
+
+@pytest.mark.parametrize(
+    ('service_type', 'create_method', 'model_data'),
+    [
+        (LLMModelsService, 'create_llm_model', {'provider_uuid': PROVIDER, 'name': 'chat', 'abilities': []}),
+        (EmbeddingModelsService, 'create_embedding_model', {'provider_uuid': PROVIDER, 'name': 'embedding'}),
+        (RerankModelsService, 'create_rerank_model', {'provider_uuid': PROVIDER, 'name': 'rerank'}),
+    ],
+)
+@pytest.mark.asyncio
+async def test_all_model_types_reject_creation_under_managed_provider(
+    monkeypatch,
+    service_type,
+    create_method: str,
+    model_data: dict,
+) -> None:
+    guard = AsyncMock(side_effect=ValueError('LangBot Models is managed by Cloud and cannot be modified'))
+    monkeypatch.setattr(model_service_module, '_assert_cloud_managed_provider_mutable', guard)
+    application = SimpleNamespace(
+        persistence_mgr=SimpleNamespace(),
+        provider_service=SimpleNamespace(
+            get_provider=AsyncMock(return_value={'uuid': PROVIDER, 'requester': LANGBOT_MODELS_PROVIDER_REQUESTER})
+        ),
+        model_mgr=None,
+    )
+    service = service_type(application)
+
+    with pytest.raises(ValueError, match='managed by Cloud'):
+        await getattr(service, create_method)(WORKSPACE, model_data)
+
+    guard.assert_awaited_once()
+
+
+@pytest.mark.parametrize(
+    ('service_type', 'get_method', 'write_method', 'payload'),
+    [
+        (LLMModelsService, 'get_llm_model', 'update_llm_model', {'name': 'changed'}),
+        (LLMModelsService, 'get_llm_model', 'delete_llm_model', None),
+        (EmbeddingModelsService, 'get_embedding_model', 'update_embedding_model', {'name': 'changed'}),
+        (EmbeddingModelsService, 'get_embedding_model', 'delete_embedding_model', None),
+        (RerankModelsService, 'get_rerank_model', 'update_rerank_model', {'name': 'changed'}),
+        (RerankModelsService, 'get_rerank_model', 'delete_rerank_model', None),
+    ],
+)
+@pytest.mark.asyncio
+async def test_all_model_types_reject_update_and_delete_for_managed_provider(
+    monkeypatch,
+    service_type,
+    get_method: str,
+    write_method: str,
+    payload: dict | None,
+) -> None:
+    guard = AsyncMock(side_effect=ValueError('LangBot Models is managed by Cloud and cannot be modified'))
+    monkeypatch.setattr(model_service_module, '_assert_cloud_managed_provider_mutable', guard)
+    application = SimpleNamespace(persistence_mgr=SimpleNamespace(mode=SimpleNamespace(value='cloud_runtime')))
+    service = service_type(application)
+    monkeypatch.setattr(
+        service,
+        get_method,
+        AsyncMock(return_value={'uuid': MODEL, 'provider_uuid': PROVIDER, 'extra_args': {}}),
+    )
+
+    args = (WORKSPACE, MODEL) if payload is None else (WORKSPACE, MODEL, payload)
+    with pytest.raises(ValueError, match='managed by Cloud'):
+        await getattr(service, write_method)(*args)
+
+    guard.assert_awaited_once()

tests/unit_tests/api/service/test_provider_service.py

@@ -25,6 +25,7 @@ from langbot.pkg.workspace.errors import WorkspaceNotFoundError
 pytestmark = pytest.mark.asyncio
 
 WORKSPACE_UUID = 'workspace-a'
+SYSTEM_REQUESTER = 'space-chat-completions'
 
 
 def _create_mock_provider(
@@ -1005,3 +1006,56 @@ class TestProviderSecretRoundtrip:
             )
 
         ap.persistence_mgr.execute_async.assert_not_awaited()
+
+
+class TestCloudManagedProviderProtection:
+    @staticmethod
+    def _service() -> ModelProviderService:
+        ap = SimpleNamespace(
+            persistence_mgr=SimpleNamespace(
+                mode=SimpleNamespace(value='cloud_runtime'),
+                execute_async=AsyncMock(),
+            ),
+            model_mgr=SimpleNamespace(),
+        )
+        return ModelProviderService(ap)
+
+    async def test_cloud_rejects_user_created_system_requester(self):
+        service = self._service()
+
+        with pytest.raises(ValueError, match='reserved'):
+            await service.create_provider(
+                WORKSPACE_UUID,
+                {
+                    'name': 'Fake LangBot Models',
+                    'requester': SYSTEM_REQUESTER,
+                    'base_url': 'https://example.invalid/v1',
+                    'api_keys': ['fake'],
+                },
+            )
+
+        with pytest.raises(ValueError, match='reserved'):
+            await service.find_or_create_provider(
+                WORKSPACE_UUID,
+                SYSTEM_REQUESTER,
+                'https://api.langbot.cloud/v1',
+                ['fake'],
+            )
+        service.ap.persistence_mgr.execute_async.assert_not_awaited()
+
+    async def test_cloud_rejects_update_and_delete_of_managed_provider(self):
+        service = self._service()
+        service.get_provider = AsyncMock(
+            return_value={'uuid': 'system-provider', 'requester': SYSTEM_REQUESTER}
+        )
+
+        with pytest.raises(ValueError, match='managed by Cloud'):
+            await service.update_provider(WORKSPACE_UUID, 'system-provider', {'name': 'Renamed'})
+        with pytest.raises(ValueError, match='managed by Cloud'):
+            await service.delete_provider(WORKSPACE_UUID, 'system-provider')
+        service.ap.persistence_mgr.execute_async.assert_not_awaited()
+
+    async def test_oss_does_not_reserve_space_requester(self):
+        ap = SimpleNamespace(persistence_mgr=SimpleNamespace(mode=SimpleNamespace(value='oss_compat')))
+        service = ModelProviderService(ap)
+        assert service._system_requester_is_reserved(SYSTEM_REQUESTER) is False

tests/unit_tests/cloud/test_bootstrap.py

@@ -66,6 +66,10 @@ class _Provider:
     def __init__(self):
         self.manifest_provider = _Manifest()
 
+    async def fetch_model_catalog(self, instance_uuid: str):
+        del instance_uuid
+        raise AssertionError('not used by bootstrap contract tests')
+
     def bootstrap(self, *, instance_uuid: str, instance_config: dict):
         del instance_config
         return VerifiedCloudDeployment(
@@ -79,6 +83,7 @@ class _Provider:
             entitlement_provider=_Entitlements(),
             directory_provider=_Directory(),
             manifest_provider=self.manifest_provider,
+            model_catalog_provider=self,
             verification_key_id='root-2026',
         )
 

tests/unit_tests/cloud/test_model_catalog.py

@@ -0,0 +1,271 @@
+from __future__ import annotations
+
+import logging
+from datetime import UTC, datetime
+from types import SimpleNamespace
+
+import pytest
+import sqlalchemy
+from sqlalchemy.ext.asyncio import create_async_engine
+
+from langbot.pkg.cloud.model_catalog import (
+    CloudModelCatalogSnapshot,
+    CloudModelCatalogSyncService,
+    system_model_uuid,
+    system_provider_uuid,
+)
+from langbot.pkg.entity.persistence.base import Base
+from langbot.pkg.entity.persistence.model import EmbeddingModel, LLMModel, ModelProvider
+from langbot.pkg.entity.persistence.workspace import Workspace
+from langbot.pkg.persistence.mgr import PersistenceManager, PersistenceMode
+
+
+pytestmark = pytest.mark.asyncio
+INSTANCE_UUID = 'instance-model-catalog'
+WORKSPACE_A = '00000000-0000-4000-8000-000000000001'
+WORKSPACE_B = '00000000-0000-4000-8000-000000000002'
+OWNER_A = '10000000-0000-4000-8000-000000000001'
+OWNER_B = '10000000-0000-4000-8000-000000000002'
+
+
+class _CatalogProvider:
+    def __init__(self, snapshot: CloudModelCatalogSnapshot) -> None:
+        self.snapshot = snapshot
+
+    async def fetch_model_catalog(self, instance_uuid: str) -> CloudModelCatalogSnapshot:
+        assert instance_uuid == INSTANCE_UUID
+        return self.snapshot
+
+
+def _snapshot(
+    *,
+    key_a: str | None = 'owner-a-key',
+    model_id: str = 'gpt-test',
+    include_embedding: bool = True,
+) -> CloudModelCatalogSnapshot:
+    models = [
+        {
+            'uuid': 'upstream-chat',
+            'model_id': model_id,
+            'category': 'chat',
+            'llm_abilities': ['chat', 'vision'],
+            'is_featured': True,
+            'featured_order': 7,
+        }
+    ]
+    if include_embedding:
+        models.append(
+            {
+                'uuid': 'upstream-embedding',
+                'model_id': 'embedding-test',
+                'category': 'embedding',
+            }
+        )
+    return CloudModelCatalogSnapshot.model_validate(
+        {
+            'instance_uuid': INSTANCE_UUID,
+            'generated_at': datetime.now(UTC),
+            'base_url': 'https://api.langbot.cloud/v1/',
+            'models': models,
+            'workspaces': [
+                {
+                    'workspace_uuid': WORKSPACE_A,
+                    'owner_account_uuid': OWNER_A,
+                    'api_key': key_a,
+                },
+                {
+                    'workspace_uuid': WORKSPACE_B,
+                    'owner_account_uuid': OWNER_B,
+                    'api_key': 'owner-b-key',
+                },
+            ],
+        }
+    )
+
+
+async def test_catalog_reconciles_every_workspace_idempotently_and_tracks_owner_and_downlisting(tmp_path) -> None:
+    engine = create_async_engine(f'sqlite+aiosqlite:///{tmp_path / "model-catalog.db"}')
+    manager = PersistenceManager(object(), mode=PersistenceMode.CLOUD_RUNTIME)
+    manager.db = SimpleNamespace(get_engine=lambda: engine)
+    bindings = [
+        SimpleNamespace(instance_uuid=INSTANCE_UUID, workspace_uuid=WORKSPACE_A, placement_generation=1),
+        SimpleNamespace(instance_uuid=INSTANCE_UUID, workspace_uuid=WORKSPACE_B, placement_generation=1),
+    ]
+    workspace_service = SimpleNamespace(list_active_execution_bindings=lambda: _async_value(bindings))
+    reload_counter = _AsyncCounter()
+    runtime_reload = SimpleNamespace(load_models_from_db=reload_counter)
+    app = SimpleNamespace(
+        persistence_mgr=manager,
+        workspace_service=workspace_service,
+        model_mgr=runtime_reload,
+        logger=logging.getLogger(__name__),
+    )
+    provider = _CatalogProvider(_snapshot())
+    service = CloudModelCatalogSyncService(app, provider, INSTANCE_UUID)
+
+    try:
+        async with engine.begin() as connection:
+            await connection.run_sync(Base.metadata.create_all)
+            await connection.execute(
+                sqlalchemy.insert(Workspace),
+                [
+                    {
+                        'uuid': WORKSPACE_A,
+                        'instance_uuid': INSTANCE_UUID,
+                        'name': 'A',
+                        'slug': 'a',
+                        'source': 'cloud_projection',
+                    },
+                    {
+                        'uuid': WORKSPACE_B,
+                        'instance_uuid': INSTANCE_UUID,
+                        'name': 'B',
+                        'slug': 'b',
+                        'source': 'cloud_projection',
+                    },
+                ],
+            )
+            await connection.execute(
+                sqlalchemy.insert(ModelProvider).values(
+                    uuid='custom-provider',
+                    workspace_uuid=WORKSPACE_A,
+                    name='Custom',
+                    requester='openai-chat-completions',
+                    base_url='https://custom.example/v1',
+                    api_keys=['custom-key'],
+                )
+            )
+            await connection.execute(
+                sqlalchemy.insert(LLMModel).values(
+                    uuid='custom-model',
+                    workspace_uuid=WORKSPACE_A,
+                    name='custom-model',
+                    provider_uuid='custom-provider',
+                    abilities=['chat'],
+                    extra_args={},
+                    prefered_ranking=0,
+                )
+            )
+
+        first = await service.sync_once()
+        assert first == {'workspaces': 2, 'created': 6, 'updated': 0, 'deleted': 0}
+        assert reload_counter.calls == 1
+
+        async with engine.connect() as connection:
+            providers = (
+                await connection.execute(
+                    sqlalchemy.select(
+                        ModelProvider.uuid,
+                        ModelProvider.workspace_uuid,
+                        ModelProvider.api_keys,
+                    ).where(ModelProvider.requester == 'space-chat-completions')
+                )
+            ).all()
+            assert {item.workspace_uuid for item in providers} == {WORKSPACE_A, WORKSPACE_B}
+            assert {item.uuid for item in providers} == {
+                system_provider_uuid(WORKSPACE_A),
+                system_provider_uuid(WORKSPACE_B),
+            }
+            assert {item.workspace_uuid: item.api_keys for item in providers} == {
+                WORKSPACE_A: ['owner-a-key'],
+                WORKSPACE_B: ['owner-b-key'],
+            }
+            assert await connection.scalar(sqlalchemy.select(sqlalchemy.func.count()).select_from(LLMModel)) == 3
+            assert await connection.scalar(sqlalchemy.select(sqlalchemy.func.count()).select_from(EmbeddingModel)) == 2
+
+        second = await service.sync_once()
+        assert second == {'workspaces': 2, 'created': 0, 'updated': 0, 'deleted': 0}
+        assert reload_counter.calls == 1
+
+        provider.snapshot = _snapshot(
+            key_a='new-owner-key',
+            model_id='gpt-renamed',
+            include_embedding=False,
+        )
+        third = await service.sync_once()
+        assert third == {'workspaces': 2, 'created': 0, 'updated': 3, 'deleted': 2}
+        assert reload_counter.calls == 2
+
+        async with engine.connect() as connection:
+            provider_a_keys = await connection.scalar(
+                sqlalchemy.select(ModelProvider.api_keys).where(ModelProvider.uuid == system_provider_uuid(WORKSPACE_A))
+            )
+            assert provider_a_keys == ['new-owner-key']
+            system_model_names = (
+                (
+                    await connection.execute(
+                        sqlalchemy.select(LLMModel.name).where(
+                            LLMModel.provider_uuid.in_(
+                                [system_provider_uuid(WORKSPACE_A), system_provider_uuid(WORKSPACE_B)]
+                            )
+                        )
+                    )
+                )
+                .scalars()
+                .all()
+            )
+            assert set(system_model_names) == {'gpt-renamed'}
+            assert await connection.scalar(sqlalchemy.select(sqlalchemy.func.count()).select_from(EmbeddingModel)) == 0
+            assert (
+                await connection.scalar(
+                    sqlalchemy.select(sqlalchemy.func.count())
+                    .select_from(ModelProvider)
+                    .where(ModelProvider.uuid == 'custom-provider')
+                )
+                == 1
+            )
+            assert (
+                await connection.scalar(
+                    sqlalchemy.select(sqlalchemy.func.count())
+                    .select_from(LLMModel)
+                    .where(LLMModel.uuid == 'custom-model')
+                )
+                == 1
+            )
+
+        provider.snapshot = _snapshot(key_a=None, model_id='gpt-renamed', include_embedding=False)
+        fourth = await service.sync_once()
+        assert fourth == {'workspaces': 2, 'created': 0, 'updated': 1, 'deleted': 0}
+        assert reload_counter.calls == 3
+        async with engine.connect() as connection:
+            provider_a_keys = await connection.scalar(
+                sqlalchemy.select(ModelProvider.api_keys).where(ModelProvider.uuid == system_provider_uuid(WORKSPACE_A))
+            )
+            assert provider_a_keys == []
+    finally:
+        await engine.dispose()
+
+
+def test_workspace_scoped_ids_are_stable_and_secrets_are_redacted() -> None:
+    assert system_provider_uuid(WORKSPACE_A) == system_provider_uuid(WORKSPACE_A)
+    assert system_provider_uuid(WORKSPACE_A) != system_provider_uuid(WORKSPACE_B)
+    assert system_model_uuid(WORKSPACE_A, 'chat', 'upstream') != system_model_uuid(WORKSPACE_B, 'chat', 'upstream')
+    snapshot = _snapshot()
+    assert 'owner-a-key' not in repr(snapshot)
+
+
+async def test_snapshot_must_cover_every_active_workspace() -> None:
+    snapshot = _snapshot().model_copy(update={'workspaces': _snapshot().workspaces[:1]})
+    app = SimpleNamespace(
+        workspace_service=SimpleNamespace(
+            list_active_execution_bindings=lambda: _async_value(
+                [SimpleNamespace(workspace_uuid=WORKSPACE_A), SimpleNamespace(workspace_uuid=WORKSPACE_B)]
+            )
+        ),
+        logger=logging.getLogger(__name__),
+    )
+    service = CloudModelCatalogSyncService(app, _CatalogProvider(snapshot), INSTANCE_UUID)
+    with pytest.raises(ValueError, match='missing billing projections for 1 active Workspaces'):
+        await service.sync_once()
+
+
+async def _async_value(value):
+    return value
+
+
+class _AsyncCounter:
+    def __init__(self) -> None:
+        self.calls = 0
+
+    async def __call__(self) -> None:
+        self.calls += 1