Add error handling for discord.ext.commands.NoPrivateMessage

[Copilot]

Summary

Adds proper error handling for discord.ext.commands.NoPrivateMessage exceptions to provide users with clear, helpful messages when they attempt to use guild-only commands in direct messages.

Problem

Currently, when users try to use commands decorated with @commands.guild_only() in DMs, they receive confusing technical error messages or unhandled exceptions. This creates a poor user experience and can lead to unnecessary support requests.

Solution

Changes Made

1. Error Handler Configuration (tux/handlers/error.py):

   • Added commands.NoPrivateMessage to ERROR_CONFIG_MAP
   • Configured with user-friendly message: "This command can only be used in a server, not in direct messages."
   • Set send_to_sentry=False to prevent noise in error monitoring (appropriate for expected user behavior)
   • Uses default log_level="INFO" (appropriate for user errors, not system errors)

2. Developer Testing Support (tux/cogs/admin/mock.py):

   • Added NoPrivateMessage test case to the mock error system
   • Allows developers to test this error handling scenario using /mock error

Impact

• 38+ guild-only commands now provide clear error messages instead of confusing technical errors
• Improved user experience - users understand why the command failed and what they need to do
• Reduced monitoring noise - no Sentry events for expected user behavior
• Consistent patterns - follows the same configuration style as other user-behavior errors like CheckFailure

Before/After

Before:

[Technical error message or unhandled exception]

After:

❌ This command can only be used in a server, not in direct messages.

Testing

• Added comprehensive verification scripts to ensure proper configuration
• Verified integration with existing guild-only commands across the codebase
• Confirmed error handling follows established patterns for similar user-behavior errors
• Added mock test case for developer testing

Commands Affected

This improvement affects all commands using @commands.guild_only(), including moderation commands like:

• /ban, /unban, /tempban
• /kick, /timeout
• Server management commands
• And many others

Users will now receive helpful guidance instead of confusing errors when trying to use these commands in DMs.

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None