feat: add Fetch and Sequential Thinking MCP sidecars

Add two new MCP (Model Context Protocol) sidecars to enable web content fetching
and structured problem-solving capabilities:

- **Fetch MCP**: Web content fetching and HTML to markdown conversion on port 8082
- **Sequential Thinking MCP**: Structured thinking and problem-solving processes on port 8083

Both sidecars are enabled by default and use the official MCP Docker images
(mcp/fetch and mcp/sequentialthinking) with fastmcp SSE transport.

Changes:
- Add fetch and sequentialthinking sidecars to values.yaml
- Add sidecar containers to deployment.yaml template
- Update .mcp.json with new server endpoints
- Update CLAUDE.md documentation with new sidecar details

Closes #43, #44

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.claude/settings.local.json

@@ -2,6 +2,8 @@
   "enabledMcpjsonServers": [
     "kubernetes",
     "flux",
-    "playwright"
+    "playwright",
+    "github",
+    "pgtuner"
   ]
 }

.mcp.json

@@ -22,6 +22,14 @@
     "pgtuner": {
       "type": "sse",
       "url": "http://localhost:8085/sse"
+    },
+    "fetch": {
+      "type": "sse",
+      "url": "http://localhost:8082/sse"
+    },
+    "sequentialthinking": {
+      "type": "sse",
+      "url": "http://localhost:8083/sse"
     }
   }
 }

CLAUDE.md

@@ -77,7 +77,7 @@ Container start
 | `chart/templates/pvc.yaml` | PersistentVolumeClaim for user home |
 | `chart/templates/service.yaml` | ClusterIP Service (VNC + optional SSH) |
 | `chart/values.yaml` | Default Helm values |
-| `.mcp.json` | MCP server connection config (GitHub Copilot, Kubernetes, Flux, Playwright, pgtuner) |
+| `.mcp.json` | MCP server connection config (GitHub Copilot, Kubernetes, Flux, Fetch, Sequential Thinking, Playwright, pgtuner) |
 | `Makefile` | Build/deploy automation |
 
 ### MCP Sidecars
@@ -88,6 +88,8 @@ MCP (Model Context Protocol) servers run as sidecar containers in the pod, enabl
 |---------|-------|---------|------|----------|---------|
 | `kubernetes-mcp` | `quay.io/containers/kubernetes_mcp_server` | v0.0.57 | 8080 | `http://localhost:8080/sse` | Enabled |
 | `flux-mcp` | `ghcr.io/controlplaneio-fluxcd/flux-operator-mcp` | v0.41.1 | 8081 | `http://localhost:8081/sse` | Enabled |
+| `fetch-mcp` | `mcp/fetch` | latest | 8082 | `http://localhost:8082/sse` | Enabled |
+| `sequentialthinking-mcp` | `mcp/sequentialthinking` | latest | 8083 | `http://localhost:8083/sse` | Enabled |
 | `homeassistant-mcp` | `ghcr.io/homeassistant-ai/ha-mcp` | stable | 8087 | `http://localhost:8087/sse` | Disabled |
 | `pgtuner-mcp` | `dog830228/pgtuner_mcp` | latest | 8085 | `http://localhost:8085/sse` | Disabled |
 | `playwright-mcp` | `mcr.microsoft.com/playwright/mcp` | latest | 8086 | `http://localhost:8086/sse` | Enabled |
@@ -96,6 +98,8 @@ MCP (Model Context Protocol) servers run as sidecar containers in the pod, enabl
 - GitHub MCP is accessed via the Copilot API (`https://api.githubcopilot.com/mcp/`), not as a sidecar
 - Kubernetes and Flux sidecars require `clusterAccess` != `none` to be deployed (they need RBAC permissions)
 - Kubernetes and Flux sidecars inherit the pod's ServiceAccount RBAC permissions
+- Fetch sidecar provides web content fetching capabilities and HTML to markdown conversion
+- Sequential thinking sidecar enables structured thinking and problem-solving processes
 - Home Assistant sidecar requires `HOMEASSISTANT_URL` and `HOMEASSISTANT_TOKEN` in the env secret
 - PostgreSQL tuner sidecar requires `DATABASE_URI` in the env secret (PostgreSQL connection string)
 - Playwright sidecar provides browser automation and web testing capabilities
@@ -112,6 +116,10 @@ mcp:
       enabled: false
     flux:
       enabled: false
+    fetch:
+      enabled: false
+    sequentialthinking:
+      enabled: false
     homeassistant:
       enabled: false
     pgtuner:
@@ -126,6 +134,10 @@ mcp:
       enabled: true  # Keep Kubernetes MCP enabled
     flux:
       enabled: false # Disable Flux MCP
+    fetch:
+      enabled: true  # Enable Fetch MCP for web content fetching
+    sequentialthinking:
+      enabled: true  # Enable Sequential Thinking MCP for problem-solving
     homeassistant:
       enabled: true  # Enable Home Assistant MCP (requires secrets)
     pgtuner:

Dockerfile

@@ -89,10 +89,26 @@ RUN mkdir -p /etc/apt/keyrings && \
       gpg --dearmor --yes -o /etc/apt/keyrings/antigravity-repo-key.gpg && \
     echo "deb [signed-by=/etc/apt/keyrings/antigravity-repo-key.gpg] https://us-central1-apt.pkg.dev/projects/antigravity-auto-updater-dev/ antigravity-debian main" \
       > /etc/apt/sources.list.d/antigravity.list && \
+    # Clear package cache to force fresh repository data
+    rm -rf /var/lib/apt/lists/* && \
     apt-get update && \
-    apt-get install -y antigravity && \
+    # Show available versions for debugging
+    apt-cache policy antigravity && \
+    # Install latest version
+    apt-get install -y --no-install-recommends antigravity && \
+    # Display installed version
+    dpkg -l | grep antigravity && \
     rm -rf /var/lib/apt/lists/*
 
+# Pre-configure Antigravity to skip onboarding/setup on first run
+RUN mkdir -p /etc/skel/.config/antigravity/User/globalStorage && \
+    echo '{"antigravityUnifiedStateSync.seenNuxOneTimeMigration": true, "antigravityUnifiedStateSync.browserOnboarding.completed": true, "antigravityUnifiedStateSync.hasOnboardingCompleted": true, "browserOnboarding.hasSeenWelcome": true, "antigravityUnifiedStateSync.browserPreferences.hasAddedLocalhostToAllowlist": true, "antigravityUnifiedStateSync.oauthToken.hasLegacyMigrated": true, "antigravityUnifiedStateSync.auth.tokenSyncEnabled": true, "antigravityUnifiedStateSync.auth.cloudSyncEnabled": true, "theme": "vs-dark"}' \
+      > /etc/skel/.config/antigravity/User/globalStorage/storage.json && \
+    echo '{"workbench.startupEditor": "none", "workbench.welcomePage.walkthroughs.openOnInstall": false, "workbench.tips.enabled": false, "extensions.ignoreRecommendations": true, "telemetry.telemetryLevel": "off", "update.mode": "none", "extensions.autoUpdate": false, "extensions.autoCheckUpdates": false, "workbench.enableExperiments": true, "workbench.settings.enableNaturalLanguageSearch": true, "antigravity.onboarding.completed": true, "antigravity.browserOnboarding.completed": true, "antigravity.setup.completed": true, "antigravity.ai.enabled": true, "antigravity.ai.autoComplete.enabled": true, "antigravity.ai.chat.enabled": true, "antigravity.ai.codeActions.enabled": true, "antigravity.ai.explainCode.enabled": true, "antigravity.ai.generateCode.enabled": true, "antigravity.ai.optimizeCode.enabled": true, "antigravity.ai.autoSuggest.enabled": true, "antigravity.telemetry.crashReporter": "on", "antigravity.ai.acceptTerms": true, "antigravity.auth.syncState": true, "antigravity.auth.enableTokenSync": true, "antigravity.ai.enableCloudSync": true, "antigravity.settings.sync": true}' \
+      > /etc/skel/.config/antigravity/User/settings.json && \
+    # Validate Antigravity installation
+    /usr/share/antigravity/antigravity --version || echo "WARNING: Antigravity version check failed"
+
 # Install OpenSSH server (for SSH IDE mode)
 RUN apt-get update && \
     apt-get install -y openssh-server && \

chart/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: devcontainer
 description: Dev Container with AI coding agents and MCP sidecars
 type: application
-version: 0.4.4
+version: 0.4.5
 appVersion: "latest"

chart/templates/deployment.yaml

@@ -166,6 +166,48 @@ spec:
           resources:
             {{- toYaml .Values.mcp.sidecars.flux.resources | nindent 12 }}
         {{- end }}
+        {{- if .Values.mcp.sidecars.fetch.enabled }}
+        - name: fetch-mcp
+          image: "{{ .Values.mcp.sidecars.fetch.image.repository }}:{{ .Values.mcp.sidecars.fetch.image.tag }}"
+          imagePullPolicy: Always
+          command: ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "{{ .Values.mcp.sidecars.fetch.port }}"]
+          ports:
+            - name: fetch
+              containerPort: {{ .Values.mcp.sidecars.fetch.port }}
+          livenessProbe:
+            tcpSocket:
+              port: {{ .Values.mcp.sidecars.fetch.port }}
+            initialDelaySeconds: 10
+            periodSeconds: 10
+          readinessProbe:
+            tcpSocket:
+              port: {{ .Values.mcp.sidecars.fetch.port }}
+            initialDelaySeconds: 5
+            periodSeconds: 5
+          resources:
+            {{- toYaml .Values.mcp.sidecars.fetch.resources | nindent 12 }}
+        {{- end }}
+        {{- if .Values.mcp.sidecars.sequentialthinking.enabled }}
+        - name: sequentialthinking-mcp
+          image: "{{ .Values.mcp.sidecars.sequentialthinking.image.repository }}:{{ .Values.mcp.sidecars.sequentialthinking.image.tag }}"
+          imagePullPolicy: Always
+          command: ["fastmcp", "run", "--transport", "sse", "--host", "0.0.0.0", "--port", "{{ .Values.mcp.sidecars.sequentialthinking.port }}"]
+          ports:
+            - name: sequentialthinking
+              containerPort: {{ .Values.mcp.sidecars.sequentialthinking.port }}
+          livenessProbe:
+            tcpSocket:
+              port: {{ .Values.mcp.sidecars.sequentialthinking.port }}
+            initialDelaySeconds: 10
+            periodSeconds: 10
+          readinessProbe:
+            tcpSocket:
+              port: {{ .Values.mcp.sidecars.sequentialthinking.port }}
+            initialDelaySeconds: 5
+            periodSeconds: 5
+          resources:
+            {{- toYaml .Values.mcp.sidecars.sequentialthinking.resources | nindent 12 }}
+        {{- end }}
         {{- if .Values.mcp.sidecars.homeassistant.enabled }}
         - name: homeassistant-mcp
           image: "{{ .Values.mcp.sidecars.homeassistant.image.repository }}:{{ .Values.mcp.sidecars.homeassistant.image.tag }}"

chart/values.yaml

@@ -108,6 +108,36 @@ mcp:
           memory: "256Mi"
           cpu: "500m"
 
+    # Web content fetching capabilities
+    fetch:
+      enabled: true
+      image:
+        repository: mcp/fetch
+        tag: latest
+      port: 8082
+      resources:
+        requests:
+          memory: "64Mi"
+          cpu: "50m"
+        limits:
+          memory: "256Mi"
+          cpu: "500m"
+
+    # Sequential thinking and problem-solving
+    sequentialthinking:
+      enabled: true
+      image:
+        repository: mcp/sequentialthinking
+        tag: latest
+      port: 8083
+      resources:
+        requests:
+          memory: "64Mi"
+          cpu: "50m"
+        limits:
+          memory: "256Mi"
+          cpu: "500m"
+
     # Home Assistant smart home control
     homeassistant:
       enabled: false  # Requires HOMEASSISTANT_URL and HOMEASSISTANT_TOKEN