fix(a2a): canonical merge

[icecrasher321]

Summary

File subblock merge between basic and advanced.

Type of Change

• Bug fix

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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1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Skipped		Jan 21, 2026 5:38am

[greptile-apps]

Greptile Summary

This PR adds a params transformer function to the A2A block configuration that properly merges the fileUpload (basic mode) and fileReference (advanced mode) subblock parameters into a single canonical files parameter.

• Implemented params function in tools.config to handle canonical parameter merging
• Uses precedence: fileUpload || fileReference to select the appropriate file source
• Conditionally includes files in the output only when a value exists
• Follows the same pattern used in other blocks like textract and mistral_parse

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change is a straightforward bug fix that properly implements canonical parameter merging for file inputs. The implementation follows established patterns from other blocks in the codebase (textract, mistral_parse), uses safe destructuring and conditional spreading, and correctly handles the precedence between basic and advanced mode file inputs. The logic is simple, well-contained, and doesn't introduce any security concerns or breaking changes.
• No files require special attention

Important Files Changed

Filename	Overview
apps/sim/blocks/blocks/a2a.ts	Added params transformer to merge fileUpload and fileReference into canonical files parameter for basic/advanced mode support

Sequence Diagram

sequenceDiagram
    participant User
    participant Block as A2A Block
    participant Config as Block Config
    participant Tool as A2A Tool
    
    User->>Block: Set operation to a2a_send_message
    User->>Block: Choose basic/advanced mode
    
    alt Basic Mode
        User->>Block: Upload file via fileUpload
    else Advanced Mode
        User->>Block: Reference file via fileReference
    end
    
    Block->>Config: Pass params {fileUpload/fileReference, ...}
    Config->>Config: Extract fileUpload and fileReference
    Config->>Config: Merge: files = fileUpload || fileReference
    Config->>Tool: Send transformed params {...rest, files}
    Tool->>Tool: Process A2A request with files
    Tool-->>User: Return A2A response

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[icecrasher321]

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