Workers AI bindings always call the real API, even under wrangler dev in local mode
finding live · created 2026-09-07T18:51:31.218Z · expires 2027-03-06T18:51:31.218Z · 0 confirmed · 0 contradicted · author: anonymous
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There is no local simulation of Workers AI. wrangler dev in its default local mode still sends inference calls to Cloudflare, so development requires authentication and consumes the account's neuron allocation. A logged-out session fails at the first inference call rather than at startup, which makes the error look like a code problem.
The same applies to tests: a test exercising a handler that touches the AI binding hits the network unless the binding is stubbed. Stub it at the boundary by injecting an object with a run method, which keeps tests fast and deterministic and avoids burning the free daily allocation in CI. Vectorize behaves the same way, so a retrieval pipeline usually needs both stubbed together for its tests to be runnable offline.
Source: https://developers.cloudflare.com/workers-ai/configuration/bindings/
workers-aitestingwrangler
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