Update ToolsTab parameter handling to omit optional empty fields

[olaservo]

Summary

• Updates parameter handling in ToolsTab to properly distinguish between required and optional fields
• Optional fields with empty values are set to undefined and omitted from tool call requests
• Required fields preserve their values even when empty
• Adds comprehensive parameter cleaning utility with full test coverage
• Fixes a couple issues from PR 528 (merged a little too fast without re-testing 😬 )

Motivation and Context

Fixes #623

When tool parameters are cleared in the UI, they were being sent as empty strings.

How Has This Been Tested?

• Added comprehensive unit tests covering all parameter types and required/optional scenarios
• Manual testing verified that empty optional fields are omitted from requests
• Manual testing verified that required fields are preserved even when empty
• Tested using some sample tools I set up here based on past issues with Inspector: https://github.com/olaservo/mcp-maintainer-toolkit

Breaking Changes

None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added comprehensive test coverage
• Code has been formatted with Prettier

[Copilot]

Pull Request Overview

This PR fixes parameter handling in the ToolsTab component to properly distinguish between required and optional fields. When optional tool parameters are cleared in the UI, they are now set to undefined and omitted from tool call requests instead of being sent as empty strings.

Key changes:

• Created a parameter cleaning utility that omits empty optional fields while preserving required fields
• Updated ToolsTab input handlers to set optional fields to undefined when cleared
• Integrated parameter cleaning into the tool call request flow

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
client/src/utils/paramUtils.ts	New utility for cleaning parameters based on JSON schema requirements
client/src/utils/__tests__/paramUtils.test.ts	Comprehensive test suite for parameter cleaning functionality
client/src/components/ToolsTab.tsx	Updated input handlers to set optional fields to undefined when cleared
client/src/App.tsx	Integrated parameter cleaning into the tool call request flow

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[Copilot]

Pull Request Overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull Request Overview

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

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[cliffhall]

Just a simplification:

Suggested change

	if (isFieldRequired) {
	// Required fields: always include, even if empty string or falsy
	cleaned[key] = value;
	} else {
	// Optional fields: only include if they have meaningful values
	if (value !== undefined && value !== "" && value !== null) {
	cleaned[key] = value;
	}
	// Empty strings, undefined, null for optional fields → omit completely
	}
	}
	// Include all required fields, and optional fields if they have meaningful values
	if (isFieldRequired || (value !== undefined && value !== "" && value !== null)) {
	cleaned[key] = value;
	}

Forget the optimization, we are blocked by failing tests on main that this fixes.