Add nodered-mcp chart (fgjcarlos/nodered-mcp)

MCP server exposing a Node-RED instance's admin API as agent tools.
Single Deployment + Service + Ingress, image tracked off the upstream
releases -- the tags are v-prefixed but the ghcr image tags are not,
hence the version-pattern.

MCP_HTTP_TOKEN is required rather than optional: upstream's listener
binds all container interfaces, so there is no loopback-trust mode. The
chart therefore requires existingSecret instead of defaulting it away.
readOnly defaults on, so an agent cannot deploy flows by accident.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

nodered-mcp/Chart.yaml

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+apiVersion: v2
+name: nodered-mcp
+description: MCP server exposing a Node-RED instance's admin API as agent tools (fgjcarlos/nodered-mcp)
+type: application
+version: 0.1.0
+appVersion: "0.7.2"
+annotations:
+  version-source: github-release:fgjcarlos/nodered-mcp
+  version-pattern: "s|^v||"

nodered-mcp/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    app.kubernetes.io/name: {{ .Chart.Name }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+    app.kubernetes.io/component: mcp
+  annotations:
+    version-source: {{ index .Chart.Annotations "version-source" }}
+    version-pattern: {{ index .Chart.Annotations "version-pattern" | quote }}
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Release.Name }}
+    spec:
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: {{ .Values.port }}
+              name: http
+              protocol: TCP
+          env:
+            - name: NODERED_URL
+              value: {{ required "noderedURL is required" .Values.noderedURL | quote }}
+            - name: MCP_READ_ONLY
+              value: {{ .Values.readOnly | quote }}
+            - name: MCP_HTTP_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: {{ required "existingSecret is required" .Values.existingSecret }}
+                  key: {{ .Values.tokenKey }}
+            {{- range $key, $value := .Values.env }}
+            - name: {{ $key }}
+              value: {{ $value | quote }}
+            {{- end }}
+            {{- range .Values.secretEnvKeys }}
+            - name: {{ .envName }}
+              valueFrom:
+                secretKeyRef:
+                  name: {{ $.Values.existingSecret }}
+                  key: {{ .secretKey }}
+            {{- end }}
+          # /mcp answers only to authenticated POSTs, so an HTTP probe there
+          # would read as failure. Check the listener itself instead.
+          livenessProbe:
+            tcpSocket:
+              port: http
+            initialDelaySeconds: 20
+            periodSeconds: 15
+            failureThreshold: 3
+          readinessProbe:
+            tcpSocket:
+              port: http
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}

nodered-mcp/templates/ingress.yaml

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+{{- range $name, $config := .Values.ingresses }}
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ $.Release.Name }}-{{ $name }}
+  {{- with $config.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  rules:
+    - host: {{ $config.host }}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ $.Release.Name }}
+                port:
+                  number: {{ $.Values.service.port }}
+  {{- with $config.tls }}
+  tls:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}

nodered-mcp/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}
+  labels:
+    app.kubernetes.io/name: {{ .Chart.Name }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+spec:
+  type: {{ .Values.service.type }}
+  selector:
+    app: {{ .Release.Name }}
+  ports:
+    - name: http
+      port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP

nodered-mcp/values.yaml

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+image:
+  repository: ghcr.io/fgjcarlos/nodered-mcp
+  pullPolicy: IfNotPresent
+
+# The container's HTTP listener. Upstream's streamable-HTTP transport serves
+# MCP at /mcp on this port.
+port: 8090
+
+service:
+  type: ClusterIP
+  port: 8090
+
+# The Node-RED admin API this server drives, e.g. http://node-red:1880
+noderedURL: ""
+
+# Refuse every write tool (flow deploy, node install). Leave on unless the
+# agent is meant to change flows.
+readOnly: true
+
+# Secret holding the server's own bearer token. Upstream requires
+# MCP_HTTP_TOKEN — the listener binds all interfaces, so there is no
+# "trusted loopback" mode to fall back on.
+existingSecret: ""
+tokenKey: MCP_HTTP_TOKEN
+
+# Additional non-secret environment variables
+env: {}
+
+# Additional secret-backed environment variables
+secretEnvKeys: []
+  # - envName: NODERED_TOKEN
+  #   secretKey: NODERED_TOKEN
+
+resources:
+  requests:
+    cpu: "50m"
+    memory: "64Mi"
+  limits:
+    cpu: "500m"
+    memory: "256Mi"
+
+nodeSelector: {}
+tolerations: []
+affinity: {}
+
+ingresses: {}
+  # https:
+  #   host: red-mcp.mcp.example.com
+  #   annotations: {}
+  #   tls:
+  #     - hosts:
+  #         - red-mcp.mcp.example.com