diff --git a/packages/opencode/src/session/message-v2.ts b/packages/opencode/src/session/message-v2.ts
index 2745ff4f45d7..cc558f5a6032 100644
--- a/packages/opencode/src/session/message-v2.ts
+++ b/packages/opencode/src/session/message-v2.ts
@@ -714,6 +714,18 @@ export const toModelMessagesEffect = Effect.fnUntraced(function* (
               text: `[Attached ${part.mime}: ${part.filename ?? "file"}]`,
             })
           } else {
+            if (isMedia(part.mime)) {
+              const filename = part.filename ?? ""
+              const lower = filename.toLowerCase()
+              let trigger = "image"
+              if (lower.includes("screenshot")) trigger = "screenshot"
+              else if (lower.includes("clipboard")) trigger = "clipboard"
+              else if (lower.includes("photo")) trigger = "photo"
+              userMessage.parts.push({
+                type: "text",
+                text: `[${trigger}]`,
+              })
+            }
             userMessage.parts.push({
               type: "file",
               url: part.url,
diff --git a/packages/opencode/test/session/message-v2.test.ts b/packages/opencode/test/session/message-v2.test.ts
index 82bed0e9cc6f..8efd60b8498a 100644
--- a/packages/opencode/test/session/message-v2.test.ts
+++ b/packages/opencode/test/session/message-v2.test.ts
@@ -303,6 +303,7 @@ describe("session.message-v2.toModelMessage", () => {
         role: "user",
         content: [
           { type: "text", text: "hello" },
+          { type: "text", text: "[image]" },
           {
             type: "file",
             mediaType: "image/png",