feat: Expose registry endpoints on feature server for MCP access

Mount the existing REST registry routers under /registry on the feature server so that fastapi_mcp automatically exposes registry introspection (list/get for entities, feature views, data sources, feature services, permissions, projects, saved datasets, lineage, search) as MCP tools. The RegistryServer is created in-process from store.registry — no external registry server is required. Auth is enforced via inject_user_details on every mounted router. Made-with: Cursor Signed-off-by: Chaitany patel <patelchaitany93@gmail.com> Made-with: Cursor Signed-off-by: RutujaPathade <73137503+RutujaPathade@users.noreply.github.com>
ntkathole · May 23, 2026 · May 13, 2026 · May 8, 2026 · May 15, 2026 · May 16, 2026
commit 53e4a9213be991d9d17b63658fb3d631065c9105
diff --git a/.secrets.baseline b/.secrets.baseline
diff --git a/docs/how-to-guides/feast-operator/03-serving-and-observability.md b/docs/how-to-guides/feast-operator/03-serving-and-observability.md
@@ -279,6 +279,34 @@ MCP is mounted at `/mcp` on port 6566 — no additional Kubernetes Service is cr
 > **Dependency**: the feature server image must include `feast[mcp]` (`fastapi-mcp`).
 > Without it the server starts normally but MCP routes are not registered.
 
+### Registry MCP
+
+MCP can also be enabled on the **registry REST server**, exposing registry metadata
+(entities, feature views, feature services) as MCP tool endpoints. This is configured
+under `registry.local.server.mcp` and requires `restAPI: true`.
+
+```yaml
+services:
+  registry:
+    local:
+      server:
+        restAPI: true
+        mcp:
+          enabled: true
+      persistence:
+        store:
+          type: sql
+          secretRef:
+            name: feast-data-stores
+```
+
+The operator writes `registry.mcp.enabled: true` into `feature_store.yaml` when
+this field is set. A CEL validation rule enforces that `restAPI` must be `true`
+when MCP is enabled.
+
+> **Note**: Registry MCP uses only the `enabled` field — `serverName`, `serverVersion`,
+> and `transport` are not applicable to the registry server.
+
 ---
 
 ## `serving` vs `server` — summary

diff --git a/docs/how-to-guides/feast-operator/04-registry-topology.md b/docs/how-to-guides/feast-operator/04-registry-topology.md
@@ -75,6 +75,32 @@ registry:
       grpc: true       # enable gRPC (default: true when server is set)
 ```
 
+### MCP on the registry server
+
+When the REST API is enabled, you can additionally expose registry metadata as
+MCP (Model Context Protocol) tool endpoints for LLM agents:
+
+```yaml
+services:
+  registry:
+    local:
+      server:
+        restAPI: true
+        mcp:
+          enabled: true
+      persistence:
+        store:
+          type: sql
+          secretRef:
+            name: feast-data-stores
+```
+
+The operator writes `registry.mcp.enabled: true` into `feature_store.yaml`.
+A validation rule enforces that `restAPI` must be `true` when `mcp.enabled` is `true`.
+
+See [Guide 3 — Serving & Observability](03-serving-and-observability.md#registry-mcp)
+for more details and the full MCP configuration reference.
+
 ---
 
 ## Remote registry
@@ -188,4 +214,5 @@ spec:
 - [API reference — `RemoteRegistryConfig`](https://github.com/feast-dev/feast/blob/stable/infra/feast-operator/docs/api/markdown/ref.md#remoteregistryconfig)
 - [Sample: all remote servers](https://github.com/feast-dev/feast/blob/stable/infra/feast-operator/config/samples/v1_featurestore_all_remote_servers.yaml)
 - [Sample: DB persistence](https://github.com/feast-dev/feast/blob/stable/infra/feast-operator/config/samples/v1_featurestore_db_persistence.yaml)
+- [Sample: MCP](https://github.com/feast-dev/feast/blob/stable/infra/feast-operator/config/samples/v1_featurestore_mcp.yaml)
 - [Feast SDK — Registries](../reference/registries/)
diff --git a/docs/reference/feature-store-yaml.md b/docs/reference/feature-store-yaml.md
@@ -49,6 +49,29 @@ feature_server:
   offline_push_batching_batch_interval_seconds: 5 # Maximum time rows may remain buffered before a forced flush.
 ```
 
+### registry
+
+The `registry` field can be a simple path string or an object with additional
+configuration. When using the REST registry server, MCP support can be enabled:
+
+```yaml
+registry:
+  registry_type: sql
+  path: postgresql+psycopg://feast:feast@localhost:5432/feast #pragma: allowlist secret
+  mcp:
+    enabled: true
+```
+
+| Field | Type | Default | Description |
+|-------|------|---------|-------------|
+| `registry_type` | string | `file` | Registry backend (`file`, `sql`, etc.) |
+| `path` | string | — | Connection string or file path |
+| `mcp.enabled` | bool | `false` | Enable MCP (Model Context Protocol) on the REST registry server |
+
+When `registry.mcp.enabled` is `true`, the REST registry server exposes registry
+metadata (entities, feature views, feature services) as MCP tool endpoints for
+LLM agents. Requires `feast[mcp]` to be installed.
+
 ## Providers
 
 The `provider` field defines the environment in which Feast will execute data flows. As a result, it also determines the default values for other fields.

diff --git a/infra/feast-operator/api/v1/featurestore_types.go b/infra/feast-operator/api/v1/featurestore_types.go
@@ -770,6 +770,7 @@ type WorkerConfigs struct {
 
 // RegistryServerConfigs creates a registry server for the feast service, with specified container configurations.
 // +kubebuilder:validation:XValidation:rule="self.restAPI == true || self.grpc == true || !has(self.grpc)", message="At least one of restAPI or grpc must be true"
+// +kubebuilder:validation:XValidation:rule="!has(self.mcp) || !self.mcp.enabled || (has(self.restAPI) && self.restAPI == true)", message="MCP requires restAPI to be true"
 type RegistryServerConfigs struct {
 	ServerConfigs `json:",inline"`
 
@@ -778,6 +779,11 @@ type RegistryServerConfigs struct {
 
 	// Enable gRPC registry server. Defaults to true if unset.
 	GRPC *bool `json:"grpc,omitempty"`
+
+	// Mcp enables MCP (Model Context Protocol) on the REST registry server.
+	// Requires restAPI to be true. Reuses the same McpConfig struct as the online store.
+	// +optional
+	Mcp *McpConfig `json:"mcp,omitempty"`
 }
 
 // CronJobContainerConfigs k8s container settings for the CronJob

diff --git a/infra/feast-operator/api/v1/zz_generated.deepcopy.go b/infra/feast-operator/api/v1/zz_generated.deepcopy.go
diff --git a/infra/feast-operator/bundle/manifests/feast-operator.clusterserviceversion.yaml b/infra/feast-operator/bundle/manifests/feast-operator.clusterserviceversion.yaml
@@ -135,7 +135,7 @@ metadata:
         }
       ]
     capabilities: Basic Install
-    createdAt: "2026-05-04T03:44:24Z"
+    createdAt: "2026-05-12T07:35:41Z"
     operators.operatorframework.io/builder: operator-sdk-v1.41.0
     operators.operatorframework.io/project_layout: go.kubebuilder.io/v4
   name: feast-operator.v0.63.0

diff --git a/infra/feast-operator/bundle/manifests/feast.dev_featurestores.yaml b/infra/feast-operator/bundle/manifests/feast.dev_featurestores.yaml
@@ -3061,6 +3061,31 @@ spec:
                                 - error
                                 - critical
                                 type: string
+                              mcp:
+                                description: |-
+                                  Mcp enables MCP (Model Context Protocol) on the REST registry server.
+                                  Requires restAPI to be true.
+                                properties:
+                                  enabled:
+                                    description: Enable the MCP server.
+                                    type: boolean
+                                  serverName:
+                                    description: MCP server name for identification.
+                                      Defaults to "feast-mcp-server".
+                                    type: string
+                                  serverVersion:
+                                    description: MCP server version string. Defaults
+                                      to "1.0.0".
+                                    type: string
+                                  transport:
+                                    description: MCP transport protocol.
+                                    enum:
+                                    - sse
+                                    - http
+                                    type: string
+                                required:
+                                - enabled
+                                type: object
                               metrics:
                                 description: Metrics exposes Prometheus-compatible
                                   metrics for the Feast server when enabled.
@@ -9031,6 +9056,31 @@ spec:
                                     - error
                                     - critical
                                     type: string
+                                  mcp:
+                                    description: |-
+                                      Mcp enables MCP (Model Context Protocol) on the REST registry server.
+                                      Requires restAPI to be true.
+                                    properties:
+                                      enabled:
+                                        description: Enable the MCP server.
+                                        type: boolean
+                                      serverName:
+                                        description: MCP server name for identification.
+                                          Defaults to "feast-mcp-server".
+                                        type: string
+                                      serverVersion:
+                                        description: MCP server version string. Defaults
+                                          to "1.0.0".
+                                        type: string
+                                      transport:
+                                        description: MCP transport protocol.
+                                        enum:
+                                        - sse
+                                        - http
+                                        type: string
+                                    required:
+                                    - enabled
+                                    type: object
                                   metrics:
                                     description: Metrics exposes Prometheus-compatible
                                       metrics for the Feast server when enabled.

diff --git a/infra/feast-operator/config/crd/bases/feast.dev_featurestores.yaml b/infra/feast-operator/config/crd/bases/feast.dev_featurestores.yaml
@@ -3061,6 +3061,31 @@ spec:
                                 - error
                                 - critical
                                 type: string
+                              mcp:
+                                description: |-
+                                  Mcp enables MCP (Model Context Protocol) on the REST registry server.
+                                  Requires restAPI to be true.
+                                properties:
+                                  enabled:
+                                    description: Enable the MCP server.
+                                    type: boolean
+                                  serverName:
+                                    description: MCP server name for identification.
+                                      Defaults to "feast-mcp-server".
+                                    type: string
+                                  serverVersion:
+                                    description: MCP server version string. Defaults
+                                      to "1.0.0".
+                                    type: string
+                                  transport:
+                                    description: MCP transport protocol.
+                                    enum:
+                                    - sse
+                                    - http
+                                    type: string
+                                required:
+                                - enabled
+                                type: object
                               metrics:
                                 description: Metrics exposes Prometheus-compatible
                                   metrics for the Feast server when enabled.
@@ -3255,6 +3280,9 @@ spec:
                             x-kubernetes-validations:
                             - message: At least one of restAPI or grpc must be true
                               rule: self.restAPI == true || self.grpc == true || !has(self.grpc)
+                            - message: MCP requires restAPI to be true
+                              rule: '!has(self.mcp) || !self.mcp.enabled || (has(self.restAPI)
+                                && self.restAPI == true)'
                         type: object
                       remote:
                         description: RemoteRegistryConfig points to a remote feast
@@ -9031,6 +9059,31 @@ spec:
                                     - error
                                     - critical
                                     type: string
+                                  mcp:
+                                    description: |-
+                                      Mcp enables MCP (Model Context Protocol) on the REST registry server.
+                                      Requires restAPI to be true.
+                                    properties:
+                                      enabled:
+                                        description: Enable the MCP server.
+                                        type: boolean
+                                      serverName:
+                                        description: MCP server name for identification.
+                                          Defaults to "feast-mcp-server".
+                                        type: string
+                                      serverVersion:
+                                        description: MCP server version string. Defaults
+                                          to "1.0.0".
+                                        type: string
+                                      transport:
+                                        description: MCP transport protocol.
+                                        enum:
+                                        - sse
+                                        - http
+                                        type: string
+                                    required:
+                                    - enabled
+                                    type: object
                                   metrics:
                                     description: Metrics exposes Prometheus-compatible
                                       metrics for the Feast server when enabled.
@@ -9231,6 +9284,9 @@ spec:
                                     true
                                   rule: self.restAPI == true || self.grpc == true
                                     || !has(self.grpc)
+                                - message: MCP requires restAPI to be true
+                                  rule: '!has(self.mcp) || !self.mcp.enabled || (has(self.restAPI)
+                                    && self.restAPI == true)'
                             type: object
                           remote:
                             description: RemoteRegistryConfig points to a remote feast

diff --git a/infra/feast-operator/config/samples/v1_featurestore_mcp.yaml b/infra/feast-operator/config/samples/v1_featurestore_mcp.yaml
@@ -17,3 +17,10 @@ spec:
           serverVersion: "1.0.0"
           # transport can be "sse" (default) or "http"
           transport: sse
+    registry:
+      local:
+        server:
+          # MCP on the registry requires REST API to be enabled.
+          restAPI: true
+          mcp:
+            enabled: true