feat(resend): expand integration with contacts, domains, and enhanced email ops

[waleedlatif1]

Summary

• Add 7 new Resend operations: get email, create/list/get/update/delete contacts, list domains
• Enhance send email with cc, bcc, reply-to, scheduled send, and tags support
• Add operation dropdown to block with conditional fields per operation
• Default operation is send_email for full backwards compatibility

Type of Change

• New feature

Testing

Tested manually

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Feb 27, 2026 5:56am

[greptile-apps]

Greptile Summary

Expanded the Resend integration from a single send email operation to a comprehensive suite of 8 operations covering email sending, retrieval, contact management, and domain listing.

Key Changes:

• Enhanced send email with cc, bcc, reply-to, scheduled sending, and tags support
• Added operation dropdown to block with conditional field rendering per operation
• Implemented 7 new operations: get email, create/list/get/update/delete contacts, list domains
• Maintained full backwards compatibility with send_email as the default operation
• ISO 8601 datetime validation added for scheduled sends
• Tag parsing properly handles values containing colons using indexOf and substring
• Comprehensive documentation added for all new operations

Architecture:
The implementation follows established patterns with each operation as a separate tool config file, proper TypeScript typing, snake_case to camelCase mapping for API responses, and user-only visibility for API keys per project guidelines.

Confidence Score: 4/5

• This PR is safe to merge with minor validation concerns already noted in previous review
• Score reflects well-structured implementation with comprehensive new operations, proper backwards compatibility, and consistent patterns. Previous review identified validation concerns (email format, array support for to field) that remain unaddressed but don't block core functionality. All new operations follow project conventions, type safety is maintained, and documentation is thorough.
• Pay attention to apps/sim/app/api/tools/mail/send/route.ts - validation concerns from previous review regarding email format and array support for the to field

Important Files Changed

Filename	Overview
apps/sim/app/api/tools/mail/send/route.ts	Added new email fields (cc, bcc, replyTo, scheduledAt, tags); validation relaxed for email addresses; previous review noted validation concerns
apps/sim/blocks/blocks/resend.ts	Added operation dropdown with 8 operations; conditional fields per operation; proper backwards compatibility with send_email default
apps/sim/tools/resend/send.ts	Enhanced with cc, bcc, replyTo, scheduledAt, and tags parameters; proper user-only visibility for API key
apps/sim/tools/resend/types.ts	Comprehensive TypeScript types for all operations; well-structured with proper param/result interfaces

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Resend Block] --> B{Operation Dropdown}
    B -->|send_email| C[Send Email Route]
    B -->|get_email| D[Get Email Tool]
    B -->|create_contact| E[Create Contact Tool]
    B -->|list_contacts| F[List Contacts Tool]
    B -->|get_contact| G[Get Contact Tool]
    B -->|update_contact| H[Update Contact Tool]
    B -->|delete_contact| I[Delete Contact Tool]
    B -->|list_domains| J[List Domains Tool]
    
    C --> K[Validate Params]
    K --> L{ContentType?}
    L -->|html| M[Set HTML + Text]
    L -->|text| N[Set Text Only]
    M --> O[Add Optional Fields]
    N --> O
    O --> P{Tags Present?}
    P -->|yes| Q[Parse Tags with indexOf/substring]
    P -->|no| R[Build Email Data]
    Q --> R
    R --> S[Resend API: Send Email]
    
    D --> T[Resend API: GET /emails/:id]
    E --> U[Resend API: POST /contacts]
    F --> V[Resend API: GET /contacts]
    G --> W[Resend API: GET /contacts/:id]
    H --> X[Resend API: PATCH /contacts/:id]
    I --> Y[Resend API: DELETE /contacts/:id]
    J --> Z[Resend API: GET /domains]
    
    S --> AA[Return Success + Email ID]
    T --> AB[Return Email Details]
    U --> AC[Return Contact ID]
    V --> AD[Return Contacts Array]
    W --> AE[Return Contact Details]
    X --> AF[Return Updated Contact ID]
    Y --> AG[Return Deleted Status]
    Z --> AH[Return Domains Array]

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_{Last reviewed commit: 350d864}

[greptile-apps]

_{14 files reviewed, 5 comments}

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[waleedlatif1]

@cursor review

[waleedlatif1]

@greptile

[waleedlatif1]

@cursor review

[waleedlatif1]

@greptile

[cursor]

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