Azure Lighthouse Management Skill

Manage Azure Lighthouse delegations, cross-tenant access, managed service offers, and role assignments.

MANDATORY: Discovery-First Pattern

Always inspect delegation assignments and tenant context before operations.

Phase 1: Discovery

#!/bin/bash
echo "=== Current Tenant ==="
az account show --query '{TenantId:tenantId,Name:name,Id:id}' -o table 2>/dev/null

echo ""
echo "=== Delegated Subscriptions ==="
az account list --query '[*].{Name:name,Id:id,TenantId:tenantId,State:state}' -o table 2>/dev/null | head -15

echo ""
echo "=== Registration Assignments ==="
az managedservices assignment list --query '[*].{Name:name,State:properties.provisioningState,Registration:properties.registrationDefinitionId}' -o table 2>/dev/null | head -15

echo ""
echo "=== Registration Definitions ==="
az managedservices definition list --query '[*].{Name:properties.registrationDefinitionName,ManagedBy:properties.managedByTenantId,State:properties.provisioningState}' -o table 2>/dev/null | head -15

Phase 2: Analysis

#!/bin/bash
echo "=== Delegation Details ==="
az managedservices definition list --query '[*].{Name:properties.registrationDefinitionName,ManagedTenant:properties.managedByTenantId,Description:properties.description}' -o table 2>/dev/null | head -10

echo ""
echo "=== Authorization Details ==="
az managedservices definition list -o json 2>/dev/null | jq '.[].properties.authorizations[] | {principalId, roleDefinitionId, principalIdDisplayName}' | head -25

echo ""
echo "=== Eligible Authorizations ==="
az managedservices definition list -o json 2>/dev/null | jq '.[].properties.eligibleAuthorizations[]? | {principalId, roleDefinitionId, justInTimeAccessPolicy}' | head -15

echo ""
echo "=== Cross-Tenant Resources ==="
for sub in $(az account list --query '[?tenantId!=`'$(az account show --query tenantId -o tsv)'`].id' -o tsv 2>/dev/null | head -5); do
  echo "--- Subscription: $sub ---"
  az resource list --subscription "$sub" --query '[*].{Type:type}' -o tsv 2>/dev/null | sort | uniq -c | sort -rn | head -5
done

Output Rules

• TOKEN EFFICIENCY: Target <=50 lines per output
• Show delegation relationships concisely
• Summarize authorization roles, not full role definition IDs
• List cross-tenant resources by type

Safety Rules

• NEVER modify delegations without tenant owner confirmation
• Review authorization roles before accepting managed service offers
• Audit cross-tenant access regularly
• Use eligible authorizations with JIT access for elevated roles
• Verify managed-by tenant ID before accepting registrations

Output Format

Present results as a structured report:

Managing Azure Lighthouse Report
════════════════════════════════
Resources discovered: [count]

Resource       Status    Key Metric    Issues
──────────────────────────────────────────────
[name]         [ok/warn] [value]       [findings]

Summary: [total] resources | [ok] healthy | [warn] warnings | [crit] critical
Action Items: [list of prioritized findings]

Target ≤50 lines of output. Use tables for multi-resource comparisons.

Anti-Hallucination Rules

1. NEVER assume resource names — always discover via CLI/API in Phase 1 before referencing in Phase 2.
2. NEVER fabricate metric names or dimensions — verify against the service documentation or --help output.
3. NEVER mix CLI commands between service versions — confirm which version/API you are targeting.
4. ALWAYS use the discovery → verify → analyze chain — every resource referenced must have been discovered first.
5. ALWAYS handle empty results gracefully — an empty response is valid data, not an error to retry.

Counter-Rationalizations

Shortcut	Counter	Why
"I'll skip discovery and check known resources"	Always run Phase 1 discovery first	Resource names change, new resources appear — assumed names cause errors
"The user only asked for a quick check"	Follow the full discovery → analysis flow	Quick checks miss critical issues; structured analysis catches silent failures
"Default configuration is probably fine"	Audit configuration explicitly	Defaults often leave logging, security, and optimization features disabled
"Metrics aren't needed for this"	Always check relevant metrics when available	API/CLI responses show current state; metrics reveal trends and intermittent issues
"I don't have access to that"	Try the command and report the actual error	Assumed permission failures prevent useful investigation; actual errors are informative