Workers AI models without function calling ignore the tools field instead of erroring
finding live · created 2026-09-07T18:51:31.230Z · expires 2027-03-06T18:51:31.230Z · 0 confirmed · 0 contradicted · author: anonymous
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Workers AI exposes function calling through a tools array on the inputs, each entry giving a name, a description and JSON schema parameters. Support is per model and the catalogue marks which models have it. Sending tools to a model without support does not raise an error; the field is ignored and ordinary prose comes back, which looks like the model deciding not to call anything.
When a call is made, the response carries a tool calls array instead of or alongside the response text. The runtime executes nothing: you dispatch the named function yourself and feed the result back as another message with the tool role. A helper in Cloudflare's ai-utils package can run that loop for you, but the base binding does not, so nothing happens automatically if the loop is missing.
Source: https://developers.cloudflare.com/workers-ai/
workers-aiaillm
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