feat: allow filtering exposed tools

[mKeRix]

This will allow users to filter the tools exposed by an MCP server with include and exclude rules, giving them the option to target what the AI will use even if the underlying MCP server does not offer this functionality.

[gemini-code-assist]

Summary of Changes

Hello @mKeRix, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new feature that enables granular control over the tools exposed by Model Context Protocol (MCP) servers. Users can now define includeTools and excludeTools lists within their server configurations, allowing them to precisely manage which tools are made available to an AI, even if the underlying server provides a broader set of functionalities. This enhancement provides greater flexibility and control over AI interactions with external tools.

Highlights

• Tool Filtering Configuration: New includeTools and excludeTools options are added to server configurations (stdio, http, sse) to allow users to specify which tools an AI should use.
• Filtering Logic Implementation: A new utility function, shouldIncludeTool, is introduced to apply the filtering rules, where includeTools acts as a whitelist and excludeTools as a blacklist, with exclusions taking precedence.
• Server Aggregator Integration: The ServerAggregator now reads and applies these tool filters during initialization, ensuring only permitted tools are exposed.
• Comprehensive Testing: Dedicated unit tests have been added to validate the correctness of the tool filtering logic under various scenarios.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.14286% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.61%. Comparing base (b92f9a4) to head (7fb47fa).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/gateway/aggregator.ts	10.00%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   52.50%   52.61%   +0.10%     
==========================================
  Files          32       33       +1     
  Lines        2272     2313      +41     
  Branches      136      142       +6     
==========================================
+ Hits         1193     1217      +24     
- Misses       1079     1096      +17     

☔ View full report in Codecov by Sentry.
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[gemini-code-assist]

Code Review

This pull request introduces a valuable feature for filtering tools from MCP servers. The implementation is well-structured, with the core filtering logic correctly isolated in its own file and accompanied by a comprehensive suite of tests. The changes to the configuration schema and types are clear and consistent. I've provided a few suggestions to improve performance and code clarity. Overall, this is a solid contribution.

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• JSR.io
• GitHub release

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