feat: better image handling (auto resize & max size constraints) (#26401)

packages/opencode/src/config/attachment.ts

@@ -0,0 +1,30 @@
+export * as ConfigAttachment from "./attachment"
+
+import { Schema } from "effect"
+import { zod } from "@opencode-ai/core/effect-zod"
+import { PositiveInt, withStatics } from "@opencode-ai/core/schema"
+
+export const Image = Schema.Struct({
+  auto_resize: Schema.optional(Schema.Boolean).annotate({
+    description: "Resize images before sending them to the model when they exceed configured limits (default: true)",
+  }),
+  max_width: Schema.optional(PositiveInt).annotate({
+    description: "Maximum image width before resizing or rejecting the attachment (default: 2000)",
+  }),
+  max_height: Schema.optional(PositiveInt).annotate({
+    description: "Maximum image height before resizing or rejecting the attachment (default: 2000)",
+  }),
+  max_base64_bytes: Schema.optional(PositiveInt).annotate({
+    description: "Maximum base64 payload bytes for an image attachment (default: 4718592)",
+  }),
+})
+  .annotate({ identifier: "ImageAttachmentConfig" })
+  .pipe(withStatics((s) => ({ zod: zod(s) })))
+export type Image = Schema.Schema.Type<typeof Image>
+
+export const Info = Schema.Struct({
+  image: Schema.optional(Image).annotate({ description: "Image attachment configuration" }),
+})
+  .annotate({ identifier: "AttachmentConfig" })
+  .pipe(withStatics((s) => ({ zod: zod(s) })))
+export type Info = Schema.Schema.Type<typeof Info>