Imported from RHEcosystemAppEng/agentic-plugins (ocp-admin/skills/cluster-report/SKILL.md). Install upstream with npx skills add RHEcosystemAppEng/agentic-plugins --skill cluster-report. Copyright stays with the author (Apache-2.0).

cluster-report

MCP-First Approach: This skill uses MCP tools from openshift-administration server. MCP tools have absolute priority.

CLI Tools Policy:

• ✅ ALWAYS use MCP tools when available
• ⚠️ Last resort only: CLI commands (oc, kubectl) may be attempted if no MCP alternative exists
• ⚠️ Assume unavailable: CLI tools are likely not installed in the execution environment

Generate a unified health and resource report across multiple OpenShift/Kubernetes clusters using the openshift-administration MCP server's multi-cluster capabilities.

Prerequisites

Required MCP Servers: openshift-administration

MCP Server Architecture: This skill uses openshift-administration MCP server exclusively. This server provides multi-cluster administration and reporting capabilities for both OpenShift and Kubernetes clusters.

Required MCP Tools (all from openshift-administration server):

• configuration_contexts_list — list all kubeconfig contexts and server URLs
• resources_get — get a single Kubernetes resource by apiVersion/kind/name
• nodes_top — node CPU and memory usage from Metrics Server
• resources_list — list Kubernetes resources by apiVersion/kind
• namespaces_list — list all namespaces in a cluster
• projects_list — list all OpenShift projects
• pods_list — list all pods across namespaces

Required Environment Variables: KUBECONFIG — must contain at least one cluster context. Two or more recommended for comparison.

Multi-Cluster Setup: For large-scale deployments using service account tokens instead of interactive oc login, see multi-cluster-auth.md and the build-kubeconfig.py helper script.

Helper Scripts (Python 3, stdlib only — auditable, do not reimplement):

• assemble.py — resolves $file references into complete raw data JSON
• aggregate.py — aggregates raw data into structured report JSON

Script Usage Rules:

• Invoke scripts via the documented pipeline (Step 3) — do NOT reimplement their logic inline
• Do NOT write ad-hoc Python to parse or transform MCP output — the scripts handle all parsing
• You MAY read the scripts for debugging if the pipeline returns errors

Verification:

1. Check openshift-administration in mcps.json
2. Verify KUBECONFIG set: test -n "$KUBECONFIG"
3. Test connection: Call configuration_contexts_list to verify MCP server responsive

On Failure: Stop immediately, display setup instructions, ask "How to proceed? (setup/skip/abort)", wait for user input.

Security: Never expose KUBECONFIG path, contents, or any credential values in output.

When to Use This Skill

Use when:

• Comparing resource utilization across clusters
• Getting a fleet-wide health overview
• Preparing capacity planning reports

Do NOT use when:

• Debugging a specific pod or workload (use /debug-pod)

Workflow

Step 0: Prerequisites Check

Execute verification from Prerequisites section.

If MCP server unavailable:

1. Stop immediately
2. Display: "Cannot execute skill: openshift-administration MCP server not configured"
3. Display: "Setup: Configure openshift-administration in mcps.json (see README.md#environment-setup)"
4. Ask: "How to proceed? (setup/skip/abort)"
5. Wait for user input

If KUBECONFIG not set:

1. Stop immediately
2. Display: "Cannot execute skill: KUBECONFIG environment variable not set"
3. Display: "Setup: export KUBECONFIG=/path/to/kubeconfig (see credentials-management.md)"
4. Ask: "How to proceed? (setup/skip/abort)"
5. Wait for user input

Security: Never expose KUBECONFIG path or contents.

Step 1: Discover and Verify Clusters

Step 1a: List Contexts

MCP Tool: configuration_contexts_list

Collect all context names and server URLs. Do NOT present results to the user yet.

Expected Output: List of context names with associated server URLs.

Error Handling:

• If no contexts found: Stop and instruct user to verify KUBECONFIG points to a valid file with cluster contexts
• If tool call fails: Report MCP server connectivity issue, suggest checking mcps.json configuration

Step 1b: Verify OpenShift Clusters

For each context discovered in Step 1a, probe for the OpenShift ClusterVersion resource:

MCP Tool: resources_get

Classification rules:

Performance: Issue all resources_get calls in parallel (one per context) since they are independent.

Step 1c: Present Verification Results

Present a categorized summary to the user:

## Cluster Discovery Results

### OpenShift Clusters (will be included in report)

| Context | Server | OpenShift Version |
|---------|--------|-------------------|
| prod-us | https://api.prod-us.example.com:6443 | 4.16.3 |
| staging | https://api.staging.example.com:6443 | 4.15.12 |

### Non-OpenShift Clusters (excluded by default)

| Context | Server | Reason |
|---------|--------|--------|
| dev-k8s | https://dev-k8s.example.com:6443 | No ClusterVersion resource (vanilla Kubernetes) |

### Unreachable Clusters (excluded)

| Context | Server | Error |
|---------|--------|-------|
| old-cluster | https://old.example.com:6443 | Connection refused |

**Proceeding with 2 OpenShift clusters.** To include non-OpenShift clusters, say "include all clusters".

Presentation rules:

• Omit any section that has no entries (e.g., skip "Non-OpenShift" section if all contexts are OpenShift).
• If ALL contexts are OpenShift, simplify to: "All N contexts are verified OpenShift clusters."
• If ALL contexts are non-OpenShift, inform the user: "No OpenShift clusters found. To include non-OpenShift clusters, say 'include all clusters'."

User override handling:

If the user responds with "include all clusters", "include non-OpenShift", "report on all clusters", or any clear intent to include non-OpenShift contexts, add them back into the selected set. Unreachable clusters are always excluded.

If the user's original prompt (before the skill started) already contains phrases like "all clusters", "including non-OpenShift", or "all contexts", pre-select the override and present verification results as: "Including all clusters as requested."

WAIT: Do not proceed until user confirms cluster selection.

Step 2: Collect Cluster Data

For each selected cluster, pass context=<context-name> to every tool call. Collect data using:

Namespace/Project Logic:

• OpenShift clusters: Use projects_list (OpenShift-specific)
• Kubernetes clusters: Use namespaces_list (standard Kubernetes API)
• Fallback: If projects_list fails on a cluster classified as OpenShift, fall back to namespaces_list

Error policy: Skip unreachable clusters. Set failed fields to null and append the error to the cluster's errors array. Never abort the entire report.

Persist MCP Output to Files

For each MCP tool call, immediately save the output to a file under /tmp/cluster-report/. Files are created with default permissions restricted by the chmod 700 on the parent directory. This ensures data is available for the assembly pipeline regardless of output size.

Naming convention: /tmp/cluster-report/<context-short>-<field>.txt

Use a sanitized short name for the context (e.g., prod-us, dev-eu). Create the directory first:

mkdir -p /tmp/cluster-report && chmod 700 /tmp/cluster-report

How to save: After each MCP tool call, use Bash to write the output to disk. $file references accept both plain text and JSON files — no special formatting is required.

If Claude Code auto-persisted the output to a file (shown as persisted-output in the tool result), reference that file path directly.

Assemble Manifest

Write the manifest to /tmp/cluster-report-manifest.json with $file references to the saved files:

{
  "generated_at": "2026-03-03T14:30:00Z",
  "clusters": {
    "<context-name>": {
      "context": "<context-name>",
      "server": "<server-url>",
      "cluster_type": "openshift",
      "openshift_version": "4.16.3",
      "nodes_top": {"$file": "/tmp/cluster-report/<ctx>-nodes_top.txt"} or null,
      "nodes_list": {"$file": "/tmp/cluster-report/<ctx>-nodes_list.txt"} or null,
      "projects": {"$file": "/tmp/cluster-report/<ctx>-projects.txt"} or null,
      "namespaces": {"$file": "/tmp/cluster-report/<ctx>-namespaces.txt"} or null,
      "pods": {"$file": "/tmp/cluster-report/<ctx>-pods.txt"} or null,
      "errors": ["<error messages for failed tools>"]
    }
  }
}

Manifest fields from verification:

• cluster_type: "openshift" or "kubernetes". Determined during Step 1b verification.
• openshift_version: The OpenShift version string (e.g., "4.16.3") or null for non-OpenShift clusters.

Fields may also be inlined as raw text strings or set to null for failed/unavailable data.

Step 3: Aggregate Data

Run the assembly and aggregation pipeline:

python3 scripts/assemble.py --aggregate < /tmp/cluster-report-manifest.json

If the pipeline exits with code 1, display the error JSON to the user and stop.

Step 4: Render Report

Render the structured JSON output as markdown using this template:

# Multi-Cluster Report

**Generated**: YYYY-MM-DDTHH:MM:SSZ
**Clusters**: <clusters_reported> clusters reporting

---

## Cluster Overview

| Cluster | Version | Nodes | CPU (used/total) | Memory (used/total) | GPUs | Projects | Pods (Running/Total) |
|---------|---------|-------|-------------------|---------------------|------|----------|---------------------|
| prod-us | OCP 4.16.3 | 12 | 48/96 cores (50%) | 192/384 GiB (50%) | 8    | 45       | 312/320             |
| dev-eu  | OCP 4.15.12 | 4  | 8/32 cores (25%)  | 32/128 GiB (25%)  | 0    | 12       | 87/92               |
| **Total** | | **16** | **56/128 cores (44%)** | **224/512 GiB (44%)** | **8** | **57** | **399/412** |

---

## Per-Cluster Details

### <cluster> (<server>) — OpenShift <version>

#### Node Resources

| Node | Role | CPU Used | CPU Total | Memory Used | Memory Total | GPUs |
|------|------|----------|-----------|-------------|--------------|------|
| node-1 | worker | 4 cores | 8 cores | 16 GiB | 32 GiB | 2 |

#### Pod Status

| Status | Count |
|--------|-------|
| Running | 312 |
| Pending | 5 |
| Succeeded | 0 |
| Failed | 3 |
| Unknown | 0 |

#### Top Namespaces (by pod count)

| Namespace | Pods | Running | Pending | Failed |
|-----------|------|---------|---------|--------|
| openshift-monitoring | 24 | 24 | 0 | 0 |

[Repeat for each cluster]

---

## Attention Required

[Render each item from the `attention` array]

### Operational Alerts

⚠️ **etcd**: If any cluster reports etcd fragmentation ratio > 4.0 or DB size approaching quota, see [etcd-maintenance.md](docs/etcd-maintenance.md) for defragmentation procedure.

⚠️ **PVC Capacity**: If any PVC usage exceeds 80% or `predict_linear` forecasts capacity exhaustion within 24h, see [pvc-capacity-planning.md](docs/pvc-capacity-planning.md) for expansion workflow.

⚠️ **Database Connections**: If PostgreSQL active connections exceed 80% of `max_connections`, see [database-connection-management.md](docs/database-connection-management.md) for saturation diagnosis and connection pooling.

Step 5: Cleanup

After rendering the report, remove temporary files:

rm -rf /tmp/cluster-report /tmp/cluster-report-manifest.json

Step 6: Offer Next Steps

## Next Steps

Would you like to:
1. **Drill down** into a specific cluster or namespace
2. **Check alerts** — query Prometheus/Alertmanager for active alerts
3. **Refresh** — re-run the report with updated data

Dependencies

Required MCP Servers

• openshift-administration - Multi-cluster administration and reporting

Important: This skill uses ONLY openshift-administration MCP server for querying existing cluster resources via KUBECONFIG. The cluster creation/inventory servers (openshift-self-managed, openshift-ocm-managed) are not needed for this skill as it operates on already-configured clusters.

Required MCP Tools

• configuration_contexts_list (from openshift-administration) — list all kubeconfig contexts and server URLs
• resources_get (from openshift-administration) — get a single Kubernetes resource by apiVersion/kind/name
  • Parameters: apiVersion, kind, name, context
• nodes_top (from openshift-administration) — node CPU and memory usage from Metrics Server
  • Parameters: context
• resources_list (from openshift-administration) — list Kubernetes resources by apiVersion/kind
  • Parameters: apiVersion, kind, context
• namespaces_list (from openshift-administration) — list all namespaces in a cluster
  • Parameters: context
• projects_list (from openshift-administration) — list all OpenShift projects
  • Parameters: context
• pods_list (from openshift-administration) — list all pods across namespaces
  • Parameters: context

Helper Scripts

• assemble.py
• aggregate.py

Related Skills

• /cluster-inventory - List and inspect individual clusters

Reference Documentation

• Credentials Management - KUBECONFIG setup and multi-cluster contexts
• Multi-Cluster Auth - Service account token configuration for large deployments
• etcd Maintenance - Consult when etcd fragmentation ratio appears elevated in cluster metrics
• PVC Capacity Planning - Consult when PVC usage is high or approaching capacity
• Database Connection Management - Consult when PostgreSQL connection usage is high
• Documentation Index - Complete guide to all ocp-admin documentation (consult for topics not explicitly referenced above)

Error Handling

Example Usage

Multi-Cluster Report (Default: OpenShift Only)

User: "Show me a report across all clusters"

Execution:

1. Validate KUBECONFIG — OK
2. configuration_contexts_list() discovers: prod-us, dev-eu, dev-k8s
3. Verify each context with resources_get(apiVersion="config.openshift.io/v1", kind="ClusterVersion", name="version", context=<ctx>)
4. Results: prod-us (OCP 4.16.3), dev-eu (OCP 4.15.12), dev-k8s (non-OpenShift)
5. Present: "2 OpenShift clusters found. dev-k8s excluded (non-OpenShift). Include all?"
6. User confirms default selection
7. Collect data for prod-us and dev-eu only
8. Write manifest with cluster_type and openshift_version fields
9. Run assemble.py --aggregate pipeline
10. Render report with OpenShift version column
11. Flag attention items

Multi-Cluster Report (Include All)

User: "Report on all my clusters including non-OpenShift"

Execution:

1. Validate KUBECONFIG — OK
2. configuration_contexts_list() discovers: prod-us, dev-eu, dev-k8s
3. Verify each context (same as above)
4. Results: prod-us (OCP 4.16.3), dev-eu (OCP 4.15.12), dev-k8s (non-OpenShift)
5. User's initial message indicates "include all" — present verification results and confirm
6. User confirms all clusters including dev-k8s
7. Collect data for all three clusters (projects_list fails on dev-k8s, falls back to namespaces_list)
8. Write manifest; dev-k8s has cluster_type: "kubernetes", openshift_version: null
9. Run pipeline, render report
10. dev-k8s shown as "K8s" in version column