Commitment Analysis

Commitment Benefits & Utilization

Reports current RI / Savings Plan utilization, how much of eligible spend is covered, and what new commitments are recommended. If utilization is low, runs an optional ARG-based investigation to explain why.

Scope note: list_benefit_utilization requires a billing scope (/providers/Microsoft.Billing/billingAccounts/{id}). If the user only provides a subscription, ask for the billing account ID before running.

The ARG queries in Step 4 take subscription-id placeholders (<sub-id-1>, <sub-id-2>) — replace with the subscriptions where the reservation is scoped (Single/RG) or applied (Shared). To target a management group, first resolve member subs via ResourceContainers | where type == 'microsoft.resources/subscriptions' | where properties.managementGroupAncestorsChain has '<mg-name>' | project subscriptionId.

Run every ARG query through the generate → validate → execute workflow. The queries in Step 4 are ready to run, but pass each one to validate_query first — it confirms the syntax and property paths before you spend a call on execute_query. If you need to adapt a query to a different resource type or field, draft it with generate_query (a natural-language prompt), then validate and execute.

Step 1: Portfolio Utilization

Call list_benefit_utilization for the billing scope. The summary returns a utilization percentage per benefit, each identified by its benefitId / benefitOrderId and kind (Reservation or SavingsPlan). For each commitment, report:

• Utilization % with status: 🟢 ≥90% | 🟡 70–89% | 🔴 <70%
• Which benefit it is — kind (RI vs Savings Plan) and the benefit/order identifier.

The commitment's term, applied scope, and committed SKU/region describe the underlying reservation or savings-plan order, not the utilization summary — read them from the order itself if the user needs them.

If any commitment is below 90%, hold onto it for the optional investigation in Step 4.

Step 2: Coverage of Eligible Spend

Call query_costs with metric=AmortizedCost, groupBy=PricingModel for a recent window. There's no built-in 30-day timeframe, so use timeframe=Custom with a trailing 30-day from/to (or timeframe=TheLastMonth for the prior calendar month). Amortized cost spreads reservation and savings-plan purchases across their term, so committed usage shows up under the Reservation / SavingsPlan pricing models rather than as a lump-sum purchase.

Report the breakdown by pricing model — how much recent spend ran on Reservation / SavingsPlan versus OnDemand. A large OnDemand share relative to the committed buckets points to headroom for new commitments; size any new purchase from Azure's recommendation in Step 3, not from this split.

Do not compute a "real savings vs PAYG retail" number here. An accurate comparison requires per-SKU retail-price lookup against actual usage hours and is out of scope for this skill — defer to get_benefit_recommendations (Step 3) for vetted savings estimates from Azure.

Step 3: New Purchase Recommendations

Call get_benefit_recommendations for the user's scope. Show, as returned by the API:

• Recommended commitment — kind (Reservation or Savings Plan) and armSkuName (for a Savings Plan this is Compute_Savings_Plan, which is SKU- and region-flexible), with the hourly commitmentAmount.
• Estimated savings — savingsAmount and savingsPercentage. These are computed over the look-back period (e.g., the last 60 days), not per month — state the period rather than implying a monthly figure.
• Projected effect if purchased — coveragePercentage and averageUtilizationPercentage.

Frame these as additions to the current portfolio (Step 1), not replacements.

Step 4 (Optional): Utilization Drop Investigation

Run only if Step 1 shows utilization <90% or the user explicitly asks why utilization dropped.

Start by checking the commitment ledger with list_reservation_transactions (billing scope; pass a from date — the API looks back at most 92 days, so use a window inside the last ~3 months). Each transaction carries an eventType (Purchase, Refund, Exchange, Cancel) and eventDate:

• A recent Refund, Exchange, or Cancel directly removes covered capacity and explains a utilization drop.
• A Purchase date plus the commitment's term tells you whether a benefit has reached end of term (expiry isn't itself a transaction, so reason about it from the purchase date and term).
• The API only covers the last ~3 months; for older events it points to Cost Management Exports — say so rather than implying nothing changed.

Then rule out the other simple causes:

• Scope mismatch? Is the reservation scoped Single/RG when resources moved subscriptions or RGs?
• Region mismatch? Are new resources deploying in a region the reservation doesn't cover?

If those don't explain it, call execute_query for two Azure Resource Graph queries (one inventory, one change history):

1. Inventory of resources matching the committed type. Adapt the resource type to the reservation (e.g., Microsoft.Compute/virtualMachines for VM RIs):

   Resources
   | where type =~ '<resource-type-from-reservation>'
   | where subscriptionId in ('<sub-id-1>', '<sub-id-2>')
   | summarize count() by tostring(properties.hardwareProfile.vmSize), location
   | order by count_ desc
   

   Drop in the SKU/tier projection that matches the resource type. A lower count than the reservation expects explains a utilization drop.

2. Recent deletions and SKU changes via resourcechanges:

   resourcechanges
   | where subscriptionId in ('<sub-id-1>', '<sub-id-2>')
   | where properties.changeType in ('Delete', 'Update')
   | where properties.targetResourceType =~ '<resource-type-from-reservation>'
   | project targetResource=tostring(properties.targetResourceId),
             changeType=tostring(properties.changeType),
             timestamp=todatetime(properties.changeAttributes.timestamp),
             changedBy=tostring(properties.changeAttributes.changedBy)
   | order by timestamp desc
   | limit 30
   

   For SKU changes, inspect the row's properties.propertyChanges array (each entry has propertyName, previousValue, newValue) to confirm the SKU/size shifted.

   ⚠️ Caveats on resourcechanges: results depend on tenant permissions and on whether change tracking captured the event. An empty result does not prove nothing changed — it may mean the change is outside the retention window or not visible at the current scope.

   Presentation

• Utilization summary — Per-commitment % with status indicators.
• Commitment coverage — recent spend split across Reservation / SavingsPlan versus OnDemand.
• New recommendations — the commitment(s) returned by get_benefit_recommendations, with API-reported savings over the look-back period.
• (If Step 4 ran) Root-cause summary — What changed and when, e.g., "3 VMs deleted on April 15; SKU resized on 2 VMs on April 18." Include a one-line remediation hint:
  • Exchange the reservation for a different SKU/region (within exchange window)
  • Redeploy workloads to match the committed capacity
  • Consider Savings Plans (SKU/region flexible) for the next purchase
  • Refund if the commitment is no longer needed (subject to policy)