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feat(streaming): add automatic Thread SSE resumption - #37
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This was referenced Oct 29, 2026
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Summary
Add
sessions.threads.events.resumableStreamto Forward and Managed. Retryable disconnects resume from the last received SSE cursor with request options preserved;session.thread_status_idlekeeps the subscription open, while Thread/Session termination or Session deletion ends it. Add a typedLast-Event-IDparameter to Managed Thread streams and keep the existing one-shot API available.Why
Thread event streams currently expose only a single connection, so callers must manage reconnection and cursor recovery themselves. The new opt-in helper reuses the Session retry engine while treating Thread termination as a normal end to the subscription.
Verification
npm run buildnpm run typechecknpm testnpm run docs:check4450 offline tests passed, including public type checks and local HTTP truncation tests. Tests cover cursor/header preservation, retryable and non-retryable statuses, idle/termination semantics, cancellation, and unchanged Session behavior. All 36 README snippets compiled;
npm pack --dry-run, changelog validation, and 25 release automation tests passed. Standalone examples were unchanged and were not run against an account. Account-backed integration and QA-package acceptance remain pending after merge.Impact
CHANGELOG.mdunderUnreleased.env.live, logs, or generated test output committedAdditional context: this adds an SDK helper over existing HTTP routes, so the endpoint fixture inventory is unchanged. Dedicated behavioral contract tests and helper inventory entries were added. The change is additive and does not require migration or a version bump in this PR. The three SDK changes are submitted together on
codex/thread-sse-resumption.Related SDK PRs: go, python.