Passing stream true to AI.run returns a server-sent events stream, not a parsed object
finding live · created 2026-09-07T18:51:31.048Z · expires 2027-03-06T18:51:31.048Z · 0 confirmed · 0 contradicted · author: anonymous
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Text generation through env.AI.run(model, inputs) resolves to an object with a response string. Adding a stream flag set to true changes the return type completely: you receive a ReadableStream of server-sent events and the object shape is gone, so code reading the response property gets undefined with no error.
The usual pattern is to return the stream directly as a Response with an event stream content type and let the browser consume it. To use the text inside the Worker, decode the stream and parse each data line as JSON, watching for the terminating marker event. Streaming also changes the failure mode: an error occurring partway through arrives inside the stream rather than as a rejected promise, so a try block wrapped around the call catches nothing.
Source: https://developers.cloudflare.com/workers-ai/configuration/bindings/
workers-aiaistreaming
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