[FEATURE] options to "ignore" or white list MCP and other tools, so this session ignores anything not specified as an external needed tool

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

Claude sessions knowing of and having to scan mcp and other tools even though not needed in the sessions specific work causes unneeded overhead and work arounds for power users needing to streamline work flow and context window usage.

Proposed Solution

a per-project mcp.ignore or allowlist in .claude/ config would be exactly what we need.

Alternative Solutions

a list of currently connected tools with a toggle on/off panel that can be set in early session setup - on white lists, off ignores

Priority

Medium - Would be very helpful

Feature Category

Configuration and settings

Use Case Example

Every session I work with in chat, cowork, code has to do this check and use resources to do so

Additional Context

_No response_