[Feature Request]Support MCP tools for Plan Mode

What feature would you like to see?

Background

There are a large number of existing MCP servers, like codegraph and codebase-memory-mcp, designed to cut down token consumption when agents read and analyze source code. These MCP tools greatly optimize code context loading, avoid sending massive raw code snippets into prompts, and effectively reduce token usage.

Current Limitation

The current Plan Agent cannot connect or leverage any MCP servers. As a result, we are unable to utilize those token-saving MCP tools during code planning and code analysis workflows.
https://github.com/MoonshotAI/kimi-code/blob/44f334191989183d21920f6867c405581347c748/packages/agent-core-v2/src/agent/plan/profile/plan.ts#L20-L27

Requested Feature

Add native support for MCP to the Plan Agent module, so Plan Agent can connect to, call, and consume existing code-optimized MCP servers for code reading and analysis tasks.

Use Case

When the Plan Agent needs to parse project structures, read file contents, or inspect codebases during task planning, it can offload code fetching and preprocessing to lightweight MCP tools to lower overall token overhead.

Additional information

No response

Start with packages/agent-core-v2/src/agent/plan/profile/plan.ts, especially lines 20-27, and trace the Plan Agent entry point. Review how MCP servers are connected and invoked elsewhere in the repository before defining the integration. Done means the Plan Agent can connect to, call, and consume existing MCP tools during code planning and analysis.