Fix SonarQube issues: extract stdio-server-cmd constant and reduce main() cognitive complexity

[devin-ai-integration]

Summary

This PR addresses two high-severity SonarQube issues in the mcpcurl CLI tool:

1. String literal duplication (go:S1192): Extracted repeated "stdio-server-cmd" string into a constant
2. High cognitive complexity (go:S3776): Refactored the main() function to reduce complexity from 18 to under 15

Changes

String Duplication Fix

• Added stdioServerCmdFlag constant to eliminate 6 duplicate string literals
• Updated all flag references, error messages, and documentation to use the constant
• Improves maintainability and reduces risk of typos

Cognitive Complexity Reduction

• Extracted setupFlags() function to handle command and flag initialization
• Extracted loadSchemaAndAddCommands() function to handle schema fetching and dynamic command generation
• Simplified main() function to focus on high-level orchestration
• Maintains identical functionality while improving code organization

Testing

✅ Linting passes with 0 issues (SonarQube violations resolved)
✅ All existing tests pass
⚠️ Note: The mcpcurl command has no unit tests, so changes were validated through linting and manual verification only

Human Review Checklist

• Verify all "stdio-server-cmd" string occurrences were replaced with the constant
• Confirm extracted functions maintain identical behavior to original main() function
• Check that error handling and program flow work the same way
• Consider manual testing of the mcpcurl command if critical

Tradeoffs

• Pro: Significantly improved code maintainability and reduced duplication
• Con: Added complexity with new functions, though each has a single clear responsibility
• Risk: No automated tests for this CLI tool, so changes rely on manual verification

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Link to Devin run: https://app.devin.ai/sessions/ad0a7f4affc44fd099a2218a8b6632c5
Requested by: @zohebmunshi

[devin-ai-integration]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud