feat(ignore): add MCP_FILESYSTEM_IGNORE_PATTERNS for excluding direct…

[vipmax]

Description

Exclude dirs like .venv, .git with MCP_FILESYSTEM_IGNORE_PATTERNS env variable

Server Details

• Server: filesystem
• Changes to: added support for directories exclusion

Motivation and Context

I found that .git, .venv folders get into the output of list_directory and directory_tree methods and clutter the context for llm, wasting a lot of users' money

How Has This Been Tested?

mcp inspector

Breaking Changes

Clients like vscode can add MCP_FILESYSTEM_IGNORE_PATTERNS env and exclude dirs like .git, .venv

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

[domdomegg]

Thanks for your contribution! While we appreciate the thought you've put into this, it doesn't align with our current plans. We'd encourage you to check out our contributor guidelines and roadmap to see what areas we're actively looking for help with.

I think we'd be more excited about directions to add standardized include/exclude parameters across the tools, similar to #623