withSupermemory incompatible with AI SDK 6

[urjitc]

wrapVercelLanguageModel in packages/tools/src/vercel/index.ts uses object spread to wrap the model:

return { ...model, doGenerate: ..., doStream: ... };
AI SDK 6 models (LanguageModelV3) define specificationVersion, provider, modelId, and supportedUrls as non-enumerable/prototype properties. Spread doesn't copy them, so the wrapped model has undefined for all four — causing AI_UnsupportedModelVersionError at runtime.

Fix: replace the spread pattern with wrapLanguageModel + LanguageModelV3Middleware from ai, which is the standard way to wrap models without losing spec metadata.

Repro:

import { streamText, gateway } from "ai"; // ai@^6.0
import { withSupermemory } from "@supermemory/tools/ai-sdk";

const model = withSupermemory(gateway("google/gemini-2.5-flash"), "user-1", {
  apiKey: "...", mode: "full", addMemory: "always",
});
streamText({ model, prompt: "hello" }); // throws

Versions: @supermemory/tools@1.4.1, ai@6.0.158, @ai-sdk/provider@3.0.8

[linear]

ENG-693

[urjitc]

Crazy that no review tools caught this before it broke in prod 😢

[Dhravya]

On it! thanks for the report

[MaheshtheDev]

@urjitc i tried with your example and same versions your mentioned. We are not getting any runtime issues. can you share any logs that would be helpfull

[urjitc]

@MaheshtheDev im 90% sure the problem is the posthog wrapper over our chat route, confirming it rn with some tests

[urjitc]

@MaheshtheDev I swapped the order so that supermemory was applied before posthog, but now this is what my agent is saying as I'm getting a TypeError now

TypeError: ... (reading 'toLowerCase') In @posthog/ai, extractProvider does model.provider.toLowerCase(). @supermemory/tools builds its wrapper as { ...model, doGenerate, doStream }. That only copies own enumerable fields. Gateway metadata like provider, modelId, and specificationVersion live on the prototype, so the Supermemory object no longer exposes provider → undefined.toLowerCase().

[MaheshtheDev]

@urjitc i was able to reproduce with taking your open source repo as example and pushed the fix as well

[urjitc]

Ty so much you guys move insanely fast

[urjitc]

Closing because its been working fine :)