Add line limits and env variable configs

[olaservo]

Description

Server Details

• Server: filesystem
• Changes to: tools

Motivation and Context

There were some followups needed from this older PR: https://github.com/modelcontextprotocol/servers/pull/1027

How Has This Been Tested?

Will add tests after this jest setup is merged: https://github.com/modelcontextprotocol/servers/pull/1405

Breaking Changes

None

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] 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

[olaservo]

@claude please add tests that will cover the functionality being added in this PR.

[claude[bot]]

Claude encountered an error —— View job

Failed with exit code 128

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I'll analyze this and get back to you.

[domdomegg]

@olaservo are you able to try pushing your changes to a branch on the main servers repo, rather than your own repo? Not sure if you have perms, but maybe give it a shot? I think that will allow Claude to respond.

I'm still chasing internally about getting it working on forks - turns out to be a tricky problem security wise.