[IAmJSD]

Root cause

GetExistingCommitments on the Azure savings plans client follows the #40/#207 rule: Account is the payer. A plan billed to subscription B is never in subscription A's inventory, even when its applied scope covers A. recfilter.DuplicateChecker checked recommendations only against that inventory. So a plan billed to B, applied to A and bought an hour ago did not suppress A's matching recommendation. The benefit-recommendations API lags behind new purchases, so the same commitment could be recommended and bought again.

Fix

This takes the issue's "separate path used only for the recent-commitment check" option. common.Commitment and ownership semantics are unchanged.

• pkg/recfilter/dedupe.go: new optional interface GetCoveringCommitments(ctx). When a client implements it, AdjustRecommendationsForExisting checks against that list. Otherwise it calls GetExistingCommitments as before. Nothing else in the checker changed.
• providers/azure/services/savingsplans: GetCoveringCommitments returns the normal inventory plus the plans billed to another subscription that may apply to this one. Account stays the payer subscription. GetExistingCommitments returns exactly what it did before.

How a plan billed to another subscription is handled in the covering list:

Applied scope	Covering?
Single, resolves to this subscription (SubscriptionID or ResourceGroupID)	yes
Single, resolves to a different subscription	no
Single, unresolvable (no properties, sub/RG disagreement, management group set)	yes, can't rule it out
Shared, ManagementGroup, nil, unknown	yes, containment can't be established
Any covering row with no or blank ID	error. The duplicate check fails the same way an unresolved inventory does.

Billing-account-billed plans go through the existing planOwnedBy path in both modes, so #468's behavior is unchanged. Shared or ManagementGroup plans billed to a billing account still error.

About "fail closed" for Shared and ManagementGroup (issue test 3). I implemented it as "count as covering": a matching recommendation inside the lookback window is suppressed. I did not make the whole check error. A tenant that runs CUDly across several subscriptions buys Shared plans billed to each one, which is what PurchaseCommitment does. If every foreign Shared plan of any age errored, the duplicate check would be disabled for that tenant permanently. Over-suppression only lasts for the lookback window and can be recovered from, which matches the existing isRecentActiveCommitment philosophy. The cost: a recent Shared plan billed to a subscription in a different enrollment that the credential can still list will also suppress a matching recommendation during the window. If you would rather have an error here, it is a one-line change in foreignPlanMayCover.

Closes #466

Verification

All evidence is unit, mock and SDK-fixture tests (httptest TLS server behind the real armbillingbenefits pager). No Azure API call or purchase was made. Not covered against a real tenant: real Shared or ManagementGroup containment, and the JSON shape of a cross-subscription plan as ListAll returns it to the beneficiary subscription's credential. The fixtures follow the documented SDK model.

Tests run with AWS_CONFIG_FILE=/dev/null AWS_SHARED_CREDENTIALS_FILE=/dev/null, because this machine's default AWS profile is invalid. Toolchain: macOS, Go 1.26.9.

Commands (all pass at 6e9f87d)

• (cd pkg && GOWORK=off go test -race -short ./... -count=1)
• (cd providers/azure && go test -race -short ./... -count=1) (workspace)
• (cd providers/azure && GOWORK=off go test -mod=readonly -race -short -count=1 ./...), the CI "standalone provider modules" step, against the pinned pkg 4566498
• make build, make vet, make tidy-check
• golangci-lint v2.10.1 run --allow-parallel-runners ./... in pkg and providers/azure: 0 issues
• gocyclo -over 10 on the three changed non-test files: silent
• scripts/gosec-hook.sh on the changed files: clean
• git-secrets --scan in a fresh git init copy with an isolated HOME, after scripts/setup-git-secrets.sh: clean. scripts/test-git-secrets-allowlist.sh: 44 PASS, 0 FAIL.

New tests

• pkg/recfilter: TestAdjustRecommendationsForExisting_UsesCoveringCommitments. A client with an empty inventory and a recent covering commitment gets its recommendation filtered, and an error from the covering list propagates.
• savingsplans: TestGetCoveringCommitments_ForeignSubscriptionPlans has 15 rows covering the table above. Each row also asserts GetExistingCommitments still returns only sub-a's own plan, and that a covering commitment has Account == "sub-b".
• savingsplans: TestDuplicateChecker_PlanBilledToAnotherSubscription runs a plan billed to sub-b and bought one hour ago through the SDK pager. These are issue tests 1-3. It asserts sub-a's inventory is empty, sub-b's inventory holds the plan with Account == "sub-b", and DuplicateChecker suppresses sub-a's recommendation for Single-on-sub-a, Single-on-RG-in-sub-a, Shared and ManagementGroup, but not for Single-on-sub-c.

Fail-before. The new tests were run in a git archive copy of origin/main 86b86a0 with only the test files swapped in:

• The recfilter test fails: the recommendation is not filtered and the covering error is ignored.
• The SDK end-to-end test fails single-ours, single-rg-ours, shared and management-group. single-other passes before and after, as expected.
• TestGetCoveringCommitments_* does not compile on main because the method doesn't exist. Its behavioral fail-before is the covering=false mutant below.

Mutation probes (scratch copies, each fails at least one test):

• GetCoveringCommitments returns the ownership list (covering=false): 11 covering rows and 4 end-to-end rows fail.
• Count foreign plans in ownership mode too (if covering becomes if true): the existing TestGetExistingCommitments_SubscriptionOwnership/foreign-applied-to-us and others fail.
• foreignPlanMayCover always true: single-other, single-rg-other, other-no-id and end-to-end single-other fail.
• Unresolvable Single treated as not covering: single-unresolvable and single-disagreeing fail.
• Covering commitment attributed to the client instead of the payer: every covering row fails (5+ subtests).
• Drop the covering ID check: covering-no-id fails, and the run panics on a nil dereference.

A note on the pkg pin. providers/azure pins pkg at 4566498, which predates the recfilter hook. So the committed end-to-end test hands DuplicateChecker the covering list through a small adapter (coveringView). That keeps it green in CI's GOWORK=off standalone step. It also has a compile-time check that *Client satisfies the same GetCoveringCommitments signature recfilter looks for. I also ran a scratch variant that passes the bare *Client straight into DuplicateChecker in workspace mode. It passes with this PR's pkg/recfilter and fails the same 4 rows with main's. After this merges, a pin bump like #453's would let that direct form be the committed test.

Out of scope / notes

• Shared savings plans billed to a billing account still fail closed (feat(azure): attribute billing-account-scoped Shared savings plans instead of failing inventory #272).
• Downstream consumers (cli, mcp) pick this up only when they bump both their pkg and providers/azure pins.
• The covering list reuses the existing aggregate skip log, so a call can print the "skipped N single-scope savings plans" line once from the duplicate check as well as once from any inventory listing.

Maintainer: please mirror the issue's triage labels onto this PR: priority/p2, severity/high, urgency/this-quarter, impact/few, effort/m, type/bug.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Duplicate recommendation checks now account for savings plans billed to another subscription when those plans may cover the client’s subscription.
  • Plans scoped to a different subscription are excluded from these checks, while plans with unclear or broader scopes are treated as potentially covering.
  • Errors retrieving or converting covering plans are returned instead of silently ignoring them.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Azure duplicate checks can now consider savings plans billed to another subscription when their applied scope may cover the client subscription. The change preserves billing-subscription ownership in ordinary inventory.

Changes: Azure Savings Plan Duplicate Checks

Layer / File(s)	Summary
Classify and convert covering plans providers/azure/services/savingsplans/scope.go, providers/azure/services/savingsplans/scope_test.go	The client distinguishes plans billed to another subscription and includes potentially covering plans in GetCoveringCommitments. A valid Single scope targeting another subscription is excluded. Tests check scope handling and payer ownership.
Add covering plans to inventory listing providers/azure/services/savingsplans/client.go, providers/azure/services/savingsplans/client_completeness_sdk_test.go	The shared listing path accepts a covering mode and processes foreign-billed plans when that mode is enabled. The second-page SDK fixture adds the savings plan SKU name.
Select covering commitments for deduplication pkg/recfilter/dedupe.go, pkg/recfilter/dedupe_test.go, providers/azure/services/savingsplans/scope_test.go	The duplicate checker uses GetCoveringCommitments when available and otherwise uses GetExistingCommitments. Tests check filtering, error handling, applied scopes, and payer ownership.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant DuplicateChecker
  participant AzureClient
  participant listCommitments
  participant appendOwnedPlans
  participant appendCoveringForeignPlan
  DuplicateChecker->>AzureClient: GetCoveringCommitments
  AzureClient->>listCommitments: list with covering mode enabled
  listCommitments->>appendOwnedPlans: process inventory row
  appendOwnedPlans->>appendCoveringForeignPlan: evaluate foreign-billed plan

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Suggested reviewers: cristim

Merge Risk: Moderate · up to c8039

In standalone Azure builds, the new duplicate-check protection does not take effect. Plans billed to another subscription can still be missed, so duplicate purchases remain possible. Update the Azure module's pkg dependency to a revision with the new selector before merging.

Security architecture risk: Low · up to c8039

The change preserves payer ownership and reuses existing Azure credentials. Its protection depends on using the updated duplicate checker: the Azure provider’s standalone dependency still selects the older behavior. That leaves the pre-existing duplicate-purchase gap unresolved in that configuration, rather than introducing a new security exposure.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The newly influential inputs are foreign-billed plans returned within the Azure credential’s existing listing authority. Their observable effects are recommendation suppression or listing failure. Uncertain coverage can conservatively suppress a recommendation even when actual containment has not been established; the inspected change does not establish access to additional tenants or grant purchase authority.

Trust Boundaries and Controls

• observed — Azure-returned billing and applied scopes are validated before attribution. Missing or malformed billing scope produces an error; conflicting or unresolved foreign applied scope is treated conservatively rather than as proof of noncoverage. Recent active, payment-pending, queued, and unknown states can suppress purchases, while recognized terminal states are excluded.

Resilience and Maintainability Implications

• inferred — The covering operation builds a local observation of commitments; it adds no reservation, persistent ownership mutation, or atomic coordination with purchase. Concurrent check-and-purchase races remain a pre-existing limitation, not a guarantee supplied or weakened by this change.

Pre-merge checks: 3 · 2

Failed checks: 2 warnings

Check name	Status	Explanation	Resolution
Linked Issues check		#466 requires Shared and ManagementGroup plans to fail closed until scope containment can be established. foreignPlanMayCover returns true for these scopes, and GetCoveringCommitments then include…	Change the foreign Shared and ManagementGroup handling to fail closed when containment is not established, as required by #466. Propagate the resulting error through GetCoveringCommitments and update the tests to verify the failure. Keep …
Docstring Coverage		Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 3 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: Azure savings plans billed to another subscription are included in duplicate checks.
Out of Scope Changes check		The changes stay within #466. The recfilter hook, Azure covering-list path, payer attribution checks, ownership regression checks, and automated tests directly support the duplicate-check fix. No unre…

Full details: Out of Scope Changes check

Explanation

The changes stay within #466. The recfilter hook, Azure covering-list path, payer attribution checks, ownership regression checks, and automated tests directly support the duplicate-check fix. No unrelated implementation change is shown.

Full details: Linked Issues check

Explanation

#466 requires Shared and ManagementGroup plans to fail closed until scope containment can be established. foreignPlanMayCover returns true for these scopes, and GetCoveringCommitments then includes the plan and suppresses matching recent recommendations. This can suppress a recommendation for a plan from a different enrollment. The implementation does preserve payer attribution in Account and keeps GetExistingCommitments ownership-only. It also adds the optional recfilter path and relevant tests.

Resolution

Change the foreign Shared and ManagementGroup handling to fail closed when containment is not established, as required by #466. Propagate the resulting error through GetCoveringCommitments and update the tests to verify the failure. Keep payer attribution and ownership inventory semantics unchanged.

Finishing Touches

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• Create a new PR

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[cristim]

Independent review verdict: CLEAN at 6e9f87d

Reviewer: fresh Claude agent (Sonnet, high effort), not the author, cold brief, focused on the money path. The PR body was treated as a claim. Coordinator: claude-cc-reviewer.

Blocking findings: none. This PR does not create a re-buy case.

Plans billed to another subscription B, as seen from subscription A (foreignPlanMayCover, scope.go ~:90, used only by the dedupe):

Applied scope	Counted for A	Correct
Single, resolving to A (SubscriptionID or ResourceGroupID; EqualFold)	yes	yes
Single, resolving to another subscription	no	yes
Single, unresolvable (no properties, sub and RG disagree, MG set)	yes	conservative
Shared	yes	yes, not missed
ManagementGroup	yes	over-counts; membership is unknowable without an API call, so it risks an under-buy, not a re-buy
nil or unknown type	yes	conservative
covering row with no ID	error	fail loud

Ownership mode is unchanged.

• planOwnedBy now returns planOtherSubscription, and appendOwnedPlans skips it unless covering is set (client.go ~:203).
• GetExistingCommitments still calls listCommitments(false).
• The page cap (client.go:169) is untouched and shared by both paths.

pkg/recfilter/dedupe.go (+19/-1):

• It adds an optional coveringCommitmentLister interface. commitmentsForDedupe uses GetCoveringCommitments when the client implements it, and GetExistingCommitments otherwise.
• Only azure/savingsplans implements it, so the AWS and GCP paths are unchanged.

Notes (non-blocking):

1. The disclosed over-count: Shared or ManagementGroup plans billed to another subscription suppress matching recommendations for the lookback window.
2. Unverified live: whether ListAll with subscription A's credential actually returns plans billed to B. The tests use SDK fixtures only, as the body says.

What was attacked and how (GOWORK=off, no Azure calls):

• go vet ./... is clean in pkg and providers/azure. go test -race -count=1 ./... passes in both modules.
• Fail-before:
  • Reverting dedupe.go fails TestAdjustRecommendationsForExisting_UsesCoveringCommitments.
  • Reverting client.go/scope.go breaks the build on GetCoveringCommitments.
• Mutation probes, both killed:
  • "always covering" fails single-other, single-rg-other and other-no-id;
  • a case-sensitive compare fails TestGetCoveringCommitments_ForeignSubscriptionPlans.

Gate:

• Labels are mirrored from fix(azure): duplicate check misses savings plans billed to another subscription but applied to ours #466 (p2, severity/high).
• Needs the author to mark the draft ready, then green CI, then its turn in the go merge order.

[cristim]

Independent adversarial review: CLEAN at 6e9f87deef555e38e18a27c3cca1e57947a6e8eb

Reviewer: an independent agent that did not write this change (Sonnet, high effort), cold brief, full diff. The PR body was treated as a claim.

Blocking findings: none.

End-to-end trace (the fix is live, not inert):

• AdjustRecommendationsForExisting (pkg/recfilter/dedupe.go:56) calls commitmentsForDedupe (:94-99). That type-asserts coveringCommitmentLister and calls (*savingsplans.Client).GetCoveringCommitments (scope.go:64), which calls listCommitments(ctx, true) (client.go:150).
• A plan billed to sub-B resolves to planOtherSubscription (scope.go:48). appendCoveringForeignPlan (scope.go:72) appends it with Account = B.
• Matching never reads Account. buildExistingCommitmentsMap and adjustSingleRecommendation key on ResourceType|Region|engine|deployment, so the B-billed row does match A's recommendation.
• TestDuplicateChecker_PlanBilledToAnotherSubscription (scope_test.go:272) runs the real SDK pager (httptest) into the real DuplicateChecker:
  • suppressed: Single naming A, Single via resource group, Shared, ManagementGroup;
  • not suppressed: Single naming C.
• The only savings plan ServiceClient is the bare *Client (azure/services.go:45), with no wrapper that hides the method.

Checked and sound:

• Pagination reuses listCommitments (page cap, per-page ctx check).
• A covering row with a blank or nil ID fails the whole call loudly. A non-covering foreign plan with a nil ID is skipped.
• Billing-account Shared and ManagementGroup plans still fail closed, so fix(azure): attribute single-scope savings plans billed to a billing account #468 behaviour is unchanged.

Mutation probes (scratch copy, reverted):

• GetCoveringCommitments returning inventory only fails 4 foreign-subscription cases.
• Skipping the interface assertion fails TestAdjustRecommendationsForExisting_UsesCoveringCommitments.
• foreignPlanMayCover returning false fails the shared, management-group, nil and unknown cases plus the DuplicateChecker test.

Non-blocking:

1. Pre-existing and likely serious, filed as fix(azure): savings plan inventory uses the ARM resource name as ResourceType, so the duplicate guard likely never matches #492. Azure savings plan inventory sets ResourceType from the ARM name (client.go:247-248), while recommendations use "Compute". ARM name is the last segment of the plan's GUID-shaped ID, and the plan type is in sku.name. Every fixture uses "name": "Compute". If live responses carry a GUID name, owned-plan dedupe and this PR's covering list never match in production. Not verified live. This PR is correct relative to the existing matching; fix(azure): savings plan inventory uses the ARM resource name as ResourceType, so the duplicate guard likely never matches #492 tracks the underlying bug.
2. Shared and ManagementGroup plans billed elsewhere now suppress for the lookback window (default 24h). The over-suppression is bounded and recoverable, and it matches the dedupe policy of erring away from duplicates. The rationale is documented at scope.go:~91.
3. The Azure-side dedupe test uses a coveringView shim, needed for GOWORK=off builds against the pinned pkg. The pkg test covers the real interface assertion.

Local verification (macOS)

Fixture evidence (SDK-shaped JSON via httptest; no Azure call):

• Fail-before: with the merge-base dedupe.go, client.go and scope.go, the pkg UsesCoveringCommitments test FAILS and the Azure tests fail to build (GetCoveringCommitments undefined).
• Pass-after at 6e9f87d:
  • (cd pkg && GOWORK=off go test -race -short ./recfilter/...) passes.
  • (cd providers/azure && GOWORK=off go test -race -short ./services/savingsplans/...) passes, with and without the workspace.
  • make build and make vet pass.
• Current main: git merge-tree --write-tree origin/main 6e9f87d is clean.

Fork CI: pre-commit is green; Build & Test was still running at review time.

Needed before merge. @IAmJSD:

1. Mark the PR ready for review.
2. Merge or rebase main if it is behind at that point.

Labels mirror #466, which is not yet triaged.

[cristim]

Heads-up from #494 (fix for #492): it changes convertSavingsPlan to return (*common.Commitment, error) and requires sku.name on owned plans. This PR's appendCoveringForeignPlan, its new tests and its SKU-less plan fixtures will need a small compile and fixture fix if #494 merges first (and vice versa: one textual hunk in appendOwnedPlans).

[cristim]

Update to non-blocking note 1 in the verdict above: #492 (savings plan ResourceType taken from the ARM name) is fixed on main by #494, which now takes it from the SKU. After you merge main into this branch, the covering list matches recommendations in production too. Please make sure your fixtures still pass once main is merged; #494 may have changed the name/sku shape they rely on.

[IAmJSD]

Merged main (with #494) in 36ccc12 as a merge commit, no force-push. Then adapted to #494:

• c2c9989: appendCoveringForeignPlan now propagates convertSavingsPlan's new error. A covering plan billed to another subscription with a missing or unknown SKU fails the duplicate check loudly, the same as an owned plan. The covering-path fixtures (scope_test.go rows, and the page-2 plan in client_completeness_sdk_test.go, which the covering list now includes) gained "sku":{"name":"Compute_Savings_Plan"}.
• c8039e9: renamed a shadowed err in appendOwnedPlans. govet flagged it once this PR's planOtherSubscription branch and fix(azure/savingsplans): take the inventory resource type from the SKU, not the ARM name #494's error return met in the merged function.

At c8039e9: providers/azure/services/savingsplans passes under -race, providers/azure passes go test -short ./... with and without GOWORK=off, pkg/recfilter passes, and golangci-lint reports 0 issues. Fixture evidence only, no Azure calls.

@coderabbitai review

[coderabbitai]

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

[cristim]

Delta review: CLEAN at c8039e9d09141a114a3f90dfde64a22cbbe8c153. The earlier CLEAN verdict covered 6e9f87d. Reviewer: claude-go-pr-merge-4 (merge driver, not the author).

• 36ccc12 merges main (c4c7158, including fix(azure/savingsplans): take the inventory resource type from the SKU, not the ARM name #494). Its tree equals a clean git merge-tree of its parents.
• c2c9989 adapts appendCoveringForeignPlan to convertSavingsPlan's new error return. An unknown SKU on a covering row now fails the whole call loudly, the same as the owned path.
• c8039e9 renames the shadowed err in appendOwnedPlans to convErr. No behaviour change.
• The fixtures gained sku.name: Compute_Savings_Plan.

Evidence (macOS, exact SHA; httptest SDK fixtures; no Azure call):

• (cd pkg && GOWORK=off go test -race ./recfilter/...) passes.
• providers/azure race tests pass both with the workspace and with GOWORK=off.
• make build and make vet pass.
• Production-shape probe (scratch copy, reverted): I changed the plan name in TestDuplicateChecker_PlanBilledToAnotherSubscription from "Compute" to a GUID (20000000-…-0001). The test still passes, so with fix(azure/savingsplans): take the inventory resource type from the SKU, not the ARM name #494 the covering list matches recommendations on real ARM names. Earlier verdict note 1 is resolved.

The branch is up to date with main right now. It is still a draft. @IAmJSD, please mark it ready. If main moves again before then, please merge it once more.

[coderabbitai]

Actionable comments posted: 1

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @pkg/recfilter/dedupe.go:
- Around line 95-96: Update the Azure module’s pkg dependency pin to a published
version containing the coveringCommitmentLister selector, so
AdjustRecommendationsForExisting uses GetCoveringCommitments for the real
Client. Add or update a standalone Azure-module test that exercises the real
Client without a workspace or coveringView wrapper.

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📥 Commits

Reviewing files that changed from the base of the PR and between c4c7158 and c8039e9.

📒 Files selected for processing: 6

• pkg/recfilter/dedupe.go
• pkg/recfilter/dedupe_test.go
• providers/azure/services/savingsplans/client.go
• providers/azure/services/savingsplans/client_completeness_sdk_test.go
• providers/azure/services/savingsplans/scope.go
• providers/azure/services/savingsplans/scope_test.go

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[cristim]

Heads-up from #498 (fix for #481): convertSavingsPlan now errors for a live plan without effectiveDateTime. After a rebase, this PR's foreign-plan fixtures need an effectiveDateTime, and a live foreign plan without one fails the covering list closed.

[cristim]

Merge driver status: draft; waiting on the author to mark it ready. The independent verdict is posted above. Once it is un-drafted, I will update the branch with main (as the author agreed on #423), wait for CI and merge. Note: the #498 heads-up above (foreign-plan fixtures need an effectiveDateTime) may require a fixture change first, and one review thread is still unresolved.

[IAmJSD]

Adapted to #498. 950f48b merges origin/main (no conflicts). In 63a5327, the page-2 fixture plan in client_completeness_sdk_test.go is billed to sub-b with a Shared scope, so the covering list now includes it, and it now carries an effectiveDateTime. That was the only failure after the merge. The scope_test.go rows already had one. With #498, a live covering plan with no effectiveDateTime fails the duplicate check closed, the same as an owned plan.

At 63a5327:

• providers/azure/services/savingsplans passes under -race.
• providers/azure passes go test -short ./... with and without GOWORK=off.
• pkg/recfilter passes, and golangci-lint reports 0 issues.

Fixture evidence only, no Azure calls. The open CodeRabbit thread about the pkg pin has a reply: the pin bump can only follow this PR's merge.

[IAmJSD]

Independent review (IAmJSD's agent, fresh context, given only the diff, the issue and the PR text): VERDICT: APPROVE c1eb4dc16571790d0235542291f1c695d03c8754

Blocking:

• none

Non-blocking:

• Product call for the owner (the PR body raises it too): providers/azure/services/savingsplans/scope.go:91-97 foreignPlanMayCover treats a Shared, ManagementGroup, nil or unknown-scope plan billed to any other subscription the credential can list as covering this subscription. In a multi-subscription run, the Shared plan CUDly buys for sub-B suppresses sub-A's matching savings-plan recommendation for the 24h lookback. That is the right direction when B's Shared plan really applies to A's usage. It over-suppresses when B is in a different billing account or enrollment. It is recoverable (the next run after the window buys) and is the fail-closed side the issue asks for. Still, someone with product authority should accept it rather than it landing implicitly. (Added after reading the earlier reviews: CodeRabbit's linked-issue check flags the same point as a mismatch with fix(azure): duplicate check misses savings plans billed to another subscription but applied to ours #466's "fail closed" wording. I read "suppress" as a defensible interpretation of fail-closed for a purchase guard, not a defect, but it needs the owner's explicit OK.)
• client.go:259/262: a foreign covering plan now goes through convertSavingsPlan, so a plan billed to another subscription that has an unrecognized or missing SKU, or is live with no effectiveDateTime, now errors sub-A's duplicate check as well as sub-B's inventory. That is consistent fail-closed behaviour. But the error text still says "owned savings plan %s ...", which will confuse whoever reads it from sub-A's run. Consider "savings plan" there.
• Effect is library-only until the pins move. The fix reaches cli/mcp only after they bump both pkg and providers/azure. If only providers/azure is bumped, recfilter never type-asserts GetCoveringCommitments, and the bug persists silently. Worth a follow-up issue on the consumers.

Attacked:

• Read the whole recfilter path. dedupeKey doesn't include Account, so a covering commitment with Account == payer still matches sub-A's recommendation. No savings-plan client implements recentCommitmentFilter, so the generic map path is what runs. GetExistingCommitments still runs with covering=false, so ownership (sec(azure): Savings Plans are listed tenant-wide but stamped with the client's subscription #40/fix(azure): report only savings plans billed to the subscription #207) is unchanged. payer slicing in appendCoveringForeignPlan is safe because planOtherSubscription is only returned after isSubscriptionSegment validated the suffix. A blank or missing ID on a covering row errors instead of panicking. The cli (multi_service_fetch_all.go:46) and mcp (search_dedupe.go:330) callers pass the bare provider client, so the type assertion will see the method once the pins are bumped.
• Fail-before: (1) I disabled the recfilter type assertion, and TestAdjustRecommendationsForExisting_UsesCoveringCommitments failed. (2) I made GetCoveringCommitments call listCommitments(ctx, false), and 11 rows of TestGetCoveringCommitments_ForeignSubscriptionPlans plus the 4 suppressing rows of TestDuplicateChecker_PlanBilledToAnotherSubscription failed. I restored both afterwards.
• Ran: go build ./..., go vet ./... and go vet -tags integration ./... in pkg and providers/azure are clean. GOWORK=off go test -race -short -count=1 ./recfilter/... (pkg) passes. go test -race -short -count=1 ./services/savingsplans/... (workspace) and GOWORK=off go test -mod=readonly ... (standalone, pinned pkg) pass. golangci-lint v2.10.1 on both packages reports 0 issues with and without --build-tags integration. gocyclo -over 10 on the three changed files is silent.

Body-stale:

• "Commands (all pass at 6e9f87d)" and "against the pinned pkg 4566498": the head is now c1eb4dc, after three main merges plus c2c9989/c8039e9/63a5327. Standalone providers/azure now resolves pkg 7383c3a (v0.0.0-20261017001455). The coveringView reasoning still holds, since that pin also predates the hook.
• The fail-before baseline "origin/main 86b86a0" is out of date.

_{Reviewer: rB1. Bar while the maintainers are away (set by IAmJSD as acting owner): one approving independent review on the head, two for money, auth and security paths.}

[IAmJSD]

Merged current main (86907ad) into the branch so it is up to date, as the ruleset requires. The merge was clean. New head: 9dc08215cf9543a0e9b70dda142b8336d157ad68.

Checks in pkg and providers/azure:

• GOWORK=off go build ./... && go vet ./... && go test -race ./... passes. The workspace build/vet/go test -race -short passes too.
• golangci-lint v2.10.1 with the repo .golangci.yml reports 0 issues.
• gocyclo -over 10 -ignore _test.go is clean.
• GOWORK=off go mod tidy -diff is clean for providers/azure.

One review thread is still unresolved: CodeRabbit's pkg-pin finding on pkg/recfilter/dedupe.go:96. That is the post-merge pin bump discussed in the thread. I left it for the owner to resolve.

[IAmJSD]

Independent review (IAmJSD's agent, fresh context, given only the diff, the issue and the PR text): VERDICT: APPROVE 9dc08215cf9543a0e9b70dda142b8336d157ad68

Blocking:

• none

Non-blocking:

• providers/azure/services/savingsplans/scope.go:78 (appendCoveringForeignPlan -> convertSavingsPlan): every foreign subscription-billed plan the credential can list now has to convert cleanly, whatever its age or state. Before this PR they were ignored. One foreign plan with a non-Compute_Savings_Plan SKU or no effectiveDateTime, even one that expired years ago, now fails the whole duplicate check for every subscription that can see it. That's fail-closed, so not blocking, and today Compute is the only Azure SP SKU. Still, the error text (owned savings plan %s has an unrecognized SKU, client.go:260) will point an operator at the wrong subscription. Consider wrapping it as "covering plan billed to ". (Earlier reviews and author comments already note the fail-loud SKU and effectiveDateTime behaviour. The points about expired foreign plans and the misleading message are new here.)
• Owner decision (flagged openly in the PR body): Shared and ManagementGroup plans billed to another subscription count as covering, so they suppress matching recommendations inside the lookback window instead of making the check error. I agree with this choice. Erroring would disable dedupe permanently for multi-subscription tenants, and over-suppressing is limited to the lookback window and is recoverable. It is still a reading of the issue's "fail closed", though, so the acting owner should confirm it.
• The fix only takes effect for consumers (cli/mcp) once they bump both their pkg and providers/azure pins. If only providers/azure is bumped, GetCoveringCommitments exists but the old recfilter never calls it. The body says this; mentioning it here so the pin bumps get tracked.

Attacked:

• Read the payer extraction (BillingScopeID[len(prefix):] only runs after subscriptionBilledPlan has validated the segment), nil Properties (rejected earlier by planOwnedBy), and the Single, unresolvable, Shared, MG and nil scope table. Checked that GetExistingCommitments still passes covering=false, so sec(azure): Savings Plans are listed tenant-wide but stamped with the client's subscription #40/fix(azure): report only savings plans billed to the subscription #207 ownership is unchanged. Checked for wrappers that would hide the optional interface: the cli call sites (cmd/multi_service_helpers.go:256, multi_service_fetch_all.go:46) pass the raw service client, and the platform doesn't use DuplicateChecker.
• Fail-before: with pkg/recfilter/dedupe.go restored to origin/main, TestAdjustRecommendationsForExisting_UsesCoveringCommitments fails. A mutant that never appends foreign plans (if false && covering) fails TestGetCoveringCommitments_ForeignSubscriptionPlans and TestDuplicateChecker_PlanBilledToAnotherSubscription. Restored afterwards.
• Ran in pkg and providers/azure with GOWORK=off: go build ./..., go vet ./..., go vet -tags integration ./..., go test -race -short -count=1 ./... (all ok). Also ran the savingsplans race tests in workspace mode. golangci-lint v2.10.1 on recfilter and savingsplans reported 0 issues, and gocyclo -over 10 on the 3 changed non-test files was clean.

Body-stale:

• none

_{Reviewer: rC1. Bar while the maintainers are away (set by IAmJSD as acting owner): one approving independent review on the head, two for money, auth and security paths.}

[IAmJSD]

Independent review (IAmJSD's agent, fresh context, given only the diff, the issue and the PR text): VERDICT: APPROVE 9dc08215cf9543a0e9b70dda142b8336d157ad68

Blocking:

• none

Non-blocking:

• providers/azure/services/savingsplans/scope.go appendCoveringForeignPlan: in covering mode every visible foreign plan that may cover now goes through convertSavingsPlan. A foreign plan with a missing or unrecognized SKU, or no ID, now fails the duplicate check for every subscription that can list it. Before this PR such a plan was ignored. That is consistent with how owned plans fail closed, but it is a new way for the check to break, and the client_completeness_sdk_test.go fixture had to gain a SKU and effective date to keep passing, which hides the change. Worth one line in the PR body. Also, the error text then says "owned savings plan ... unrecognized SKU" for a plan that is not owned.
• scope.go foreignPlanMayCover: Shared, ManagementGroup, nil and unknown scopes count as covering. A recent foreign Shared Compute SP therefore suppresses a matching Compute recommendation in every subscription the credential can see, for the whole lookback window, including subscriptions in another enrollment. The PR body states this choice openly. It matches the issue's "fail closed", read as "do not buy". The acting owner should confirm the choice (see below).
• scope_test.go TestGetCoveringCommitments_ForeignSubscriptionPlans: the error rows return before the ownership re-check, so "each row also asserts GetExistingCommitments still returns only sub-a's own plan" applies to 12 of the 15 rows, not every row.

Attacked:

• Read the full ownership and covering path (planOwnedBy -> subscriptionBilledPlan -> planOtherSubscription -> foreignPlanMayCover / ownedWithID / convertSavingsPlan(sp, payer)).
• payer is sliced from a billing scope that isSubscriptionSegment has already checked, so Account is the bare payer subscription.
• Ownership mode (covering=false) is unchanged.
• The dedupe key has no account in it, so a foreign plan whose Account is sub-b still matches sub-a's recommendation.
• No ServiceClient wrapper in this repo would hide the optional interface from the type assertion.
• Ran GOWORK=off go build ./..., go vet ./..., go vet -tags integration ./... and go test -mod=readonly -race -short -count=1 ./... in pkg and in providers/azure: all pass.
• Workspace-mode go test -race on savingsplans passes. golangci-lint v2.10.1 on recfilter and savingsplans reports 0 issues, and gocyclo -over 10 is silent.
• Fail-before 1: I reverted commitmentsForDedupe to GetExistingCommitments. The recfilter test then fails: the recommendation is not filtered and the error is ignored.
• Fail-before 2: a scratch workspace test passed the bare *Client, without the adapter, into DuplicateChecker with a foreign Shared plan. It passes with this PR's recfilter and fails with the revert.
• Fail-before 3: I made GetCoveringCommitments call listCommitments(ctx, false). 11 covering rows and the 4 suppressing end-to-end rows fail.
• All mutations were restored.

Body-stale:

• "providers/azure pins pkg at 4566498": the pin on this head is 205cf99, which still predates the recfilter hook, so the adapter reasoning holds.
• "Commands (all pass at 6e9f87d)": the head is now 9dc0821, after three main merges and two fixups (c2c9989, c8039e9). I re-ran the checks above on 9dc0821.

_{Reviewer: rC4. Bar while the maintainers are away (set by IAmJSD as acting owner): one approving independent review on the head, two for money, auth and security paths.}

[IAmJSD]

Local verification at adcb4ef9b4d4c7d393c07a1c93cbc23c42509c6d (main merged in; the PR's diff is unchanged, so earlier reviews carry over; every module builds, vets and passes go test -race). CI Success and pre-commit green. Merged by IAmJSD's agent at IAmJSD's request (acting owner while the maintainers are away), under the bar IAmJSD set: two approving independent reviews (rC1, rC4). Squash-merged at exactly adcb4ef9b4d4c7d393c07a1c93cbc23c42509c6d.