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Releases

@openrouter/ai-sdk-provider@2.9.0

Minor Changes

• #486 82e8014 Thanks @robert-j-y! - Add structuredOutputs.strict setting to opt out of response_format.json_schema.strict (issue response_format.json_schema.strict is hardcoded to true, breaks routing for models whose providers don't support strict mode #483).

  Previously the SDK hardcoded strict: true whenever a JSON schema response format was used, which made it impossible to route requests to providers that don't advertise support for strict json_schema. Models like moonshotai/kimi-k2.6 (routed through Parasail/Venice/Io Net) returned HTTP 404 "No endpoints available matching your guardrail restrictions and data policy" because the strict flag eliminated every eligible endpoint.

  Users can now opt out per-model:

  const model = openrouter.chat("moonshotai/kimi-k2.6", {
    structuredOutputs: { strict: false },
  });

  The default remains strict: true for backward compatibility.

Patch Changes

• #485 bf664b1 Thanks @robert-j-y! - Fix supportedUrls['image/*'] regex to accept image URLs with query strings or fragments (e.g. https://cdn.example.com/photo.png?height=200, .../photo.webp#frag). Previously the $ anchor on the extension caused such URLs to be treated as unsupported, forcing the AI SDK runtime to download and base64-inline them, which bloated conversation history and inflated token usage.

• #489 bb2d4cb Thanks @0age! - fix: stop emitting duplicate tool-call events when a trailing-whitespace argument delta arrives after a complete tool call

  In the streaming chat handler, the merge-into-existing-tool-call path enqueues a tool-call stream event whenever the accumulated function.arguments is parsable JSON. Because JSON.parse accepts trailing whitespace, any subsequent argument delta for the same tool-call index (e.g. a stray space, newline, or closing-token chunk) leaves the arguments parsable and would re-trigger the emit, producing a second tool-call event with the same toolCallId. Downstream tool runners (e.g. Vercel AI SDK streamText) then execute the tool twice. Observed in production with moonshotai/kimi-k2.6 via OpenRouter, where the user-visible effect was every outbound message being delivered twice.

  src/chat/index.ts:

  • Merge-path tool-call emit is now gated on !toolCall.sent, mirroring the new-path behavior. The sent flag was already being set after the first emit but was never read on this path.

  src/chat/index.test.ts:

  • Adds a regression test that streams a complete tool call followed by a trailing-whitespace-only argument delta for the same index and asserts exactly one tool-call event is emitted.