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fix(ai): accept uppercase image MIME types in the Cohere route #59010

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fix(ai): accept uppercase image MIME types in the Cohere route #59010

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2 changes: 1 addition & 1 deletion packages/ai/src/protocols/cohere-chat.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -190,7 +190,7 @@ const fromRequest = Effect.fn("CohereChat.fromRequest")(function* (request: LLMR
calls.push({ id: part.id, type: "function", function: { name: part.name, arguments: args } })
continue
}
if (message.role === "user" && part.type === "media" && part.media.mediaType.startsWith("image/")) {
if (message.role === "user" && part.type === "media" && part.media.mediaType.toLowerCase().startsWith("image/")) {
const url =
ProviderShared.mediaUrl(part.media) ??
(yield* ProviderShared.requireInlineMedia("Cohere Chat", part.media)).dataUrl
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25 changes: 25 additions & 0 deletions packages/ai/test/provider/cohere.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -209,6 +209,31 @@ it.effect("Cohere rejects unsupported media instead of silently dropping it", ()
}),
)

it.effect("Cohere accepts image media regardless of MIME type casing", () =>
Effect.gen(function* () {
const prepared = yield* compileRequest(
LLM.request({
model: cohere.model("command-a-03-2025"),
messages: [
Message.user([
{ type: "media", media: Media.base64("aGVsbG8=", "IMAGE/PNG") },
{ type: "media", media: Media.url("https://files.example/pic.png", { mediaType: "Image/Png" }) },
]),
],
}),
)
expect(prepared.body.messages).toMatchObject([
{
role: "user",
content: [
{ type: "image_url", image_url: { url: "data:image/png;base64,aGVsbG8=" } },
{ type: "image_url", image_url: { url: "https://files.example/pic.png" } },
],
},
])
}),
)

it.effect("Cohere thinking budgets must be positive integers", () =>
Effect.gen(function* () {
const error = yield* compileRequest(
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