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feat:if Tool Impl or else throws McpError, use its values for the RPC error #485

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@taobaorun taobaorun commented Aug 13, 2025

Just like #465 tool Impl or else throw McpError.McpStreamableServerSession should be able to throw RPC errors and McpError is the right exception for that

Motivation and Context

This PR ensures that business-level exceptions are surfaced to the client as proper JSON-RPC errors, allowing callers to receive the real cause when a Tool (or any other operation) fails.

How Has This Been Tested?

Breaking Changes

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 or updated documentation as needed

Additional context

@taobaorun taobaorun changed the title if Tool Impl or else throws McpError, use its values for the RPC error feat:if Tool Impl or else throws McpError, use its values for the RPC error Aug 14, 2025
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