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fix(cursor): stop completed-answer replay on SDK 1.3.1 - #422
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This was referenced Nov 9, 2026
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Cursor could replay a completed answer and its tool calls when the SDK retried after turn-ended without a confirmed terminal checkpoint. Upgrade to SDK 1.3.1 and pin a patch at its retry boundary that stops that replay while preserving mid-turn reconnects, normal continuations, and cancellation.
Keep the answer visible, mark the uncertain Cursor session broken, and recover the next message in a fresh session with history, including after a server restart. Record bounded retry diagnostics to identify future triggering errors. The historical incident’s original exception remains unknown.
Validation: 145 Cursor package tests and 13 Cursor integration tests passed; installed CommonJS and ESM SDK loading and the server bundle build passed. The controlled 1.3.1 transport reproduction emits four answers/tool executions unpatched and one with the guard. The changed-file check covers formatting, lint, knip, typechecks, dependency patch application, GraphQL generation, and 49 adjacent tests. No paid model turn or live service restart was used.
Model: GPT-6 Astra. Harness: Codex in T3 Code.