feat: Support threadId in gmail_createDraft

[allenhutchison]

This PR adds support for creating draft replies linked to existing email threads in gmail_createDraft. Closes #191.

[gemini-code-assist]

Summary of Changes

Hello @allenhutchison, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the email drafting capabilities by introducing support for creating reply drafts within existing email threads. By allowing a threadId to be specified, the system can now automatically link new drafts to ongoing conversations, improving the user experience for managing email replies. This change involves updating the API schema, modifying the draft creation logic to fetch relevant thread information, and ensuring proper MIME header generation for threaded messages.

Highlights

• Gmail Draft Threading: The gmail_createDraft function now supports an optional threadId parameter, allowing users to create draft replies linked to existing email threads.
• Reply Header Generation: When a threadId is provided, the service fetches the last message's Message-ID from the specified thread and uses it to generate appropriate In-Reply-To and References headers in the MIME message.
• Robust Error Handling: The system gracefully handles cases where fetching thread information fails, ensuring that a draft can still be created even if reply headers cannot be generated.
• API Schema Update: The gmail.createDraft tool's input schema has been updated to reflect the new threadId parameter, including a clear description for its usage.

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Changelog

• workspace-server/src/tests/services/GmailService.test.ts
  • Added test case for creating a reply draft with a threadId, verifying thread fetching and MIME header generation.
  • Added test case for handling thread fetch failures gracefully while still creating the draft.
• workspace-server/src/tests/utils/MimeHelper.test.ts
  • Added test case to confirm In-Reply-To and References headers are included when provided.
  • Added test case to confirm In-Reply-To and References headers are not included when not provided.
• workspace-server/src/index.ts
  • Updated the gmail.createDraft input schema to include an optional threadId parameter.
• workspace-server/src/services/GmailService.ts
  • Defined CreateDraftParams type to include an optional threadId.
  • Modified createDraft method to accept threadId.
  • Implemented logic to fetch Message-ID from the last message of a given threadId.
  • Added error handling for thread fetching, logging warnings instead of failing.
  • Passed inReplyTo and references headers to MimeHelper.createMimeMessage.
  • Conditionally included threadId in the Gmail API drafts.create request body.
• workspace-server/src/utils/MimeHelper.ts
  • Updated createMimeMessage function signature to accept optional inReplyTo and references parameters.
  • Added logic to include In-Reply-To and References headers in the generated MIME message.

Activity

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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature to gmail_createDraft, enabling the creation of draft replies within existing email threads via a threadId. The implementation correctly fetches the parent thread to construct reply headers and passes the threadId to the Gmail API. The changes are well-structured and include appropriate tests for the new logic. I have one suggestion to improve the construction of the References header to better align with email standards, which will enhance threading compatibility across various email clients.

[abhipatel12]

LGTM!