[FEATURE]: Support MCP-CLI for on-demand loading of MCP tools for reduced token consumption

[HyunggyuJang]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Ref: https://www.reddit.com/r/ClaudeAI/comments/1phxffj/mcpcli_is_an_experimental_approach_to_mcp_tool/, anthropics/claude-code#12836 (comment)

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Filter which tools are loaded from MCP servers (includeTools/excludeTools) #7399: Filter which tools are loaded from MCP servers (includeTools/excludeTools) - proposes selective tool loading from MCPs
• Reduce token overhead: Task tool injects all subagent descriptions into system prompt #7269: Reduce token overhead from Task tool - addresses token consumption from tool injection
• Implement virtual tools feature to allow GitHub Copilot models to run with more than 128 tools #2513: Implement virtual tools feature for GitHub Copilot - similar concept of on-demand tool loading to work around tool limits

These issues discuss complementary approaches to reduce token consumption and manage tool availability. Feel free to ignore if this request has a specific MCP-CLI focus that differs from these.