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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Skipped			Dec 10, 2025 7:19pm

Greptile Overview

Greptile Summary

Fixes a bug where user-cleared form fields (empty strings '') would override LLM-generated parameter values. When users set a tool parameter and then clear it, the UI state stores '' instead of undefined. Previously, these empty strings would take precedence over LLM values during parameter merging.

• apps/sim/providers/utils.ts: prepareToolExecution now filters out empty, null, and undefined values from tool.params before merging with LLM args
• apps/sim/tools/params.ts: mergeToolParameters now applies the same filtering, making it consistent with the existing filterSchemaForLLM function
• apps/sim/tools/params.test.ts: Added two test cases validating the new filtering behavior for empty strings, null, and undefined values

The fix is consistent with the existing filterSchemaForLLM function which already had this filtering logic. The approach ensures that when a user explicitly clears a field, the LLM can still provide a value at runtime.

Confidence Score: 5/5

• This PR is safe to merge - it's a targeted bug fix with consistent implementation and good test coverage.
• The changes are minimal, focused, and follow an existing pattern already used in filterSchemaForLLM. The fix addresses a clear bug without introducing side effects. New tests validate the behavior.
• No files require special attention.

Important Files Changed

File Analysis

Sequence Diagram

sequenceDiagram
    participant UI as User Interface
    participant State as UI State
    participant PrepTool as prepareToolExecution
    participant MergeTool as mergeToolParameters
    participant LLM as LLM Agent

    UI->>State: User sets field value
    UI->>State: User clears field (becomes '')
    State->>PrepTool: tool.params (includes '')
    LLM->>PrepTool: llmArgs (generated values)
    PrepTool->>PrepTool: Filter out empty/null/undefined
    PrepTool->>PrepTool: Merge filtered params with llmArgs
    Note over PrepTool: LLM values preserved for cleared fields
    
    alt Custom Tool Path
        State->>MergeTool: userProvidedParams (includes '')
        LLM->>MergeTool: callParams (generated values)
        MergeTool->>MergeTool: Filter out empty/null/undefined
        MergeTool->>MergeTool: Merge filtered params with callParams
        Note over MergeTool: LLM values preserved for cleared fields
    end