Uploaded January 2026 | Updated September 2026, 2 weeks ago
In this video, I discuss how Anthropic has addressed the issue of context window pollution caused by MCP server tool definitions. By using the new MCP tool search, you can dynamically load tools when needed, significantly reducing token usage. I explain how this new tool search works, its benefits, and step-by-step instructions for developers on both MCP clients and servers. I also share best practices for optimizing tool descriptions and highlight potential pitfalls. If you are an MCP developer or use MCP tools, this guide will help you make the most of your context window.
LINKS:
https://x.com/trq212/status/2011523109871108570
platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
github.com/anthropics/claude-code/issues/7336
My voice to text App: whryte.com
Website: engineerprompt.ai
RAG Beyond Basics Course:
prompt-s-site.thinkific.com/courses/rag
Signup for Newsletter, localgpt:
https://tally.so/r/3y9bb0
Let's Connect:
🦾 Discord: discord.com/invite/t4eYQRUcXB
☕ Buy me a Coffee: ko-fi.com/promptengineering
|🔴 Patreon: patreon.com/PromptEngineering
💼Consulting: calendly.com/engineerprompt/consulting-call
📧 Business Contact: engineerprompt@gmail.com
Become Member: tinyurl.com/y5h28s6h
💻 Pre-configured localGPT VM: bit.ly/localGPT (use Code: PromptEngineering for 50% off).
Signup for Newsletter, localgpt:
https://tally.so/r/3y9bb0
TIMESTAMPS:
00:00 The biggest Issue with MCP
01:24 Understanding the Context Issue
01:56 How Tool Search Solves the Problem
03:09 Variants of Tool Search Mechanisms
05:04 Best Practices for Tool Descriptions
06:12 Client-Side Implementation Steps
08:42 When to Use Tool Search
09:13 Common Pitfalls to Avoid
In this video, I discuss how Anthropic has addressed the issue of context window pollution caused by MCP server tool definitions. By using the new MCP tool search, you can dynamically load tools when needed, significantly reducing token usage. I explain how this new tool search works, its benefits, and step-by-step instructions for developers on both MCP clients and servers. I also share best practices for optimizing tool descriptions and highlight potential pitfalls. If you are an MCP developer or use MCP tools, this guide will help you make the most of your context window.
LINKS:
https://x.com/trq212/status/2011523109871108570
platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
github.com/anthropics/claude-code/issues/7336
My voice to text App: whryte.com
Website: engineerprompt.ai
RAG Beyond Basics Course:
prompt-s-site.thinkific.com/courses/rag
Signup for Newsletter, localgpt:
https://tally.so/r/3y9bb0
Let's Connect:
🦾 Discord: discord.com/invite/t4eYQRUcXB
☕ Buy me a Coffee: ko-fi.com/promptengineering
|🔴 Patreon: patreon.com/PromptEngineering
💼Consulting: calendly.com/engineerprompt/consulting-call
📧 Business Contact: engineerprompt@gmail.com
Become Member: tinyurl.com/y5h28s6h
💻 Pre-configured localGPT VM: bit.ly/localGPT (use Code: PromptEngineering for 50% off).
Signup for Newsletter, localgpt:
https://tally.so/r/3y9bb0
TIMESTAMPS:
00:00 The biggest Issue with MCP
01:24 Understanding the Context Issue
01:56 How Tool Search Solves the Problem
03:09 Variants of Tool Search Mechanisms
05:04 Best Practices for Tool Descriptions
06:12 Client-Side Implementation Steps
08:42 When to Use Tool Search
09:13 Common Pitfalls to Avoid
