[slack] Instruct users to add users.profile:read scope to token

[8ma10s]

Description

Server Details

• Server: slack
• Changes to: docs (readme)

Motivation and Context

the tool slack_get_user_profile makes calls to slack's users.profile.get endpoint, which requires users.profile:read scope (ref: https://api.slack.com/methods/users.profile.get)

However this scope is not documented in the setup instruction, and any calls to slack-get_user_profile tool will fail.

How Has This Been Tested?

• instructed cursor AI to call slack_get_user_profile and ensured that the call fails
• added the scope users.profile:read, tried the above again, and the call works.

Breaking Changes

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

[olaservo]

Thanks for the update!