[FEATURE] ToolBuild hooks: Pre & Post

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I'd like to be able to manipulate the list of tools sent to LLM based on the user query.
For this purpose, I'd like to have PreToolBuild and PostToolBuild hooks.

So I can add, remove, or modify tools, their properties and enums.

Neither MCP SPEC nor current hooks allow this.

Proposed Solution

Implement ToolBuild hooks so I could fire them at runtime and make manipulations with the tools the agent has based on the user query.

Alternative Solutions

A proxy server that intercepts and modifies the tools. Is a classy solution.

Priority

High - Significant impact on productivity

Feature Category

Configuration and settings

Use Case Example

I’d like to intelligently remove and modify unnecessary tools or optional and not relevant properties or enums to save tokens and have LLM focused.

Additional Context

_No response_