Summary

Resolves Discord user mentions (e.g., <@123>) in incoming message content to human-readable names (e.g., @Alice) using the message's mentions metadata.

Fixes #20617.

Implementation

• Added resolveDiscordMentions helper in message-utils.ts
• Maps ID to global_name (priority) or username
• Handles both <@id> and <@!id> formats
• Added unit tests covering resolution and no-op cases

Impact

• Agents now see @Alice hello instead of <@12345> hello
• Improves context understanding for multi-user conversations

Greptile Summary

Adds user mention resolution to Discord message content, converting <@id> format to readable names like @Alice. The implementation correctly prioritizes global_name over username and handles both <@id> and <@!id> formats. The change is scoped to the message text resolution flow and includes appropriate test coverage for basic cases.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation is clean, focused, and follows existing patterns in the codebase. The change is scoped to message text resolution with appropriate guards. Test coverage validates the core functionality. No breaking changes or security concerns identified.
• No files require special attention

_{Last reviewed commit: 0cb7e10}

_{(4/5) You can add custom instructions or style guidelines for the agent here!}