Summary

The LINE plugin was not downloading file attachments (PDF, Word, Excel, JSON, etc.) because the media download condition only checked for image, video, and audio types.

Changes

• Added message.type === "file" to the media download condition in src/line/bot-handlers.ts
• Files are now downloaded and made available to the agent, consistent with other media types

Before

if (message.type === "image" || message.type === "video" || message.type === "audio") {

After

if (
  message.type === "image" ||
  message.type === "video" ||
  message.type === "audio" ||
  message.type === "file"
) {

Test Plan

• Existing tests pass (4/4 in bot-handlers.test.ts)
• LINE Messaging API supports file message type with the same Content API as other media

Fixes #26330

Greptile Summary

Added message.type === "file" to the media download condition in handleMessageEvent so that file attachments (PDF, Word, Excel, JSON, etc.) are now downloaded and made available to the agent. The change is consistent with existing handling for image, video, and audio types, and the extractMediaPlaceholder function in bot-message-context.ts:167-168 already includes file type support with the <media:document> placeholder. The downloadLineMedia function uses the same LINE Messaging API Content endpoint for all media types.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change is minimal (adding one message type check), follows existing patterns exactly, existing tests pass, and the supporting infrastructure already handles file types correctly (the extractMediaPlaceholder function already returns <media:document> for file types, and downloadLineMedia works with any message type via the same API)
• No files require special attention

_{Last reviewed commit: 34e2238}