[FEATURE]:Add mcp search tool, reduce mcp tool occupying a lot of context

[hongchenwendao]

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

When MCP tool descriptions exceed 10% of the context window, they are automatically deferred and discovered via the MCPSearch tool instead of being loaded upfront. This reduces context usage for users with many MCP tools configured.

I found this great tool in Claude code, which I feel can make open code even more powerful

[github-actions]

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

• [FEATURE]: Lazy/dynamic loading for mcp tools #8277: [FEATURE]: Lazy/dynamic loading for mcp tools - Proposes lazy loading pattern to reduce context bloat from MCP tool schemas
• [FEATURE]: Support MCP-CLI for on-demand loading of MCP tools for reduced token consumption #7406: [FEATURE]: Support MCP-CLI for on-demand loading of MCP tools for reduced token consumption - Suggests using MCP-CLI for on-demand tool loading
• Feature Request: Tool to list and manage MCP servers to reduce context window #2418: Feature Request: Tool to list and manage MCP servers to reduce context window - Requests better context window management for MCP servers

Feel free to ignore if none of these address your specific case.

[saidelike]

For references:

• high level description: https://x.com/i/status/2011523109871108570
• tool search specification: https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
• original Claude Code issue: Feature Request: Lazy Loading for MCP Servers and Tools (95% context reduction possible) anthropics/claude-code#7336

[assagman]

I did a similar work in here: https://github.com/assagman/opencode-toolbox

[atanasna]

I suspect this is similar to what claude code did last week, lazy loading the MCPs to reduce the context bloat. I would really love to see that in opencode as well.
My primary usecase is that I spawn multiple parallel subagents that do not need to use all tool all the time but they still consume all tokens for loading the mcp tools on every run.

This will be absolutely f amazing addition.