[Bug][http-specs] CI fails to find mismatch between main.tsp and mockapi.ts

[msyyc]

There is one mismatch https://github.com/microsoft/typespec/pull/10841/changes#r3384596566 which was already merged. But we expect CI should detect it so there must be bug in http-specs.

[github-actions]

🎯 Issue Triage

CI does not detect a mismatch between main.tsp and mockapi.ts in the @typespec/http-specs package — a known-bad mismatch from PR #10841 was merged without being caught.

Category: Bug
Area: lib:http-specs

⚠️ No reproduction provided. A link to the specific test case or the file with the mismatch (from the PR review comment) would help pinpoint the validation gap.

🔍 Analysis

• The issue references a review comment on PR #10841 where a mismatch between main.tsp (the TypeSpec spec) and mockapi.ts (the mock API implementation) slipped through CI undetected.
• The http-specs package uses Spector to validate that mock API implementations match their TypeSpec definitions. This bug suggests the consistency check either isn't running, isn't covering the affected scenario, or has a gap in its validation logic.
• Affected component: @typespec/http-specs validation/CI pipeline (likely the spector tooling or the consistency-check workflow step).
• Potential root cause: The specific operation or model type involved in the mismatch may not be covered by the existing consistency checks.

📝 Suggested next steps

• Identify which file and operation contains the mismatch from the PR feat: add cross-language Spector tests for dollar-sign query params and discriminator without subtypes #10841 review comment.
• Determine why the consistency check didn't flag it (missing test coverage in Spector, incorrect validation logic, or a CI step that wasn't triggered).
• Add a regression test / Spector case that would have caught this mismatch.
• Fix the validation gap so future mismatches are caught by CI.

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