fix(opencode): omit unsupported MCP blobs

packages/opencode/src/session/prompt.ts

@@ -742,7 +742,8 @@ export const layer = Layer.effect(
                 } else if ("blob" in c && c.blob) {
                   const mime = ("mimeType" in c ? c.mimeType : undefined) ?? part.mime
                   const url = `data:${mime};base64,${c.blob}`
-                  if (mime.split(";")[0]?.trim().toLowerCase() === "text/plain") {
+                  const mediaType = mime.split(";")[0]?.trim().toLowerCase()
+                  if (mediaType === "text/plain") {
                     pieces.push({
                       messageID: info.id,
                       sessionID: input.sessionID,
@@ -751,6 +752,20 @@ export const layer = Layer.effect(
                       text: decodeDataUrl(url),
                     })
                   }
+                  const supported =
+                    mediaType?.startsWith("image/") ||
+                    mediaType?.startsWith("audio/") ||
+                    mediaType?.startsWith("video/") ||
+                    mediaType === "application/pdf"
+                  if (mediaType !== "text/plain" && !supported) {
+                    pieces.push({
+                      messageID: info.id,
+                      sessionID: input.sessionID,
+                      type: "text",
+                      synthetic: true,
+                      text: `[Binary content: ${mime}]`,
+                    })
+                  }
                   pieces.push({
                     messageID: info.id,
                     sessionID: input.sessionID,
@@ -758,6 +773,7 @@ export const layer = Layer.effect(
                     mime,
                     filename: part.filename,
                     url,
+                    source: supported || mediaType === "text/plain" ? undefined : part.source,
                   })
                 }
               }