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Workflow SDK now sends writes over WebSockets on Vercel

The Workflow SDK now sends event writes and stream writes to Vercel Workflows over a WebSocket by default. Previously, each write, or each write group for streams, used a separate HTTP request. Developers do not need to change their code, but they must upgrade to [email protected] or later. According to the source, new runs use the WebSocket path once the upgrade is deployed, while in-flight runs finish on the existing behavior.

Source: Vercel Blog · vercel.com Published 2026-11-09T00:00:00+00:00 Detected 2026-11-11T06:30:26+00:00
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The Workflow SDK now sends event writes and stream writes to Vercel Workflows over a WebSocket by default. Previously, each write, or each write group for streams, used a separate HTTP request. Developers do not need to change their code, but they must upgrade to [email protected] or later. According to the source, new runs use the WebSocket path once the upgrade is deployed, while in-flight runs finish on the existing behavior.

AI-assisted summary based on the listed source.

The Workflow SDK now sends event writes and stream writes to Vercel Workflows over a WebSocket by default, replacing one HTTP request per write, or per write group for streams. No code change is needed beyond upgrading to [email protected] or later. Once you deploy the upgrade, new runs use it. In-flight runs finish....

Teams running workflows on Vercel will get the new transport by upgrading the SDK, without rewriting their code. Anyone whose runs are still in progress during a deploy should expect them to finish as before. The source does not give performance figures, so teams should check their own run behavior after upgrading.

Teams using AI at work may want to compare this against current productivity and review workflows.

Signal Strength 88% Technical label WATCH Public Interest 29 Category AI AT WORK Reader Depth TECHNICAL

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Recognizable Entity Score 0 Practical Impact Score 0 Novelty Interest Score 72 Consequence Score 62 Curiosity Score 16 Shareability Score 41

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