Fix: Add helpful error messages for common tool import typos (Issue #3776)

[devin-ai-integration]

Fix: Add helpful error messages for common tool import typos (Issue #3776)

Summary

This PR addresses issue #3776 where users were getting confusing import errors when trying to import tools from crewai_tools with incorrect capitalization (e.g., PGSearchtool instead of PGSearchTool).

Changes made:

• Added a module-level __getattr__ function to crewai_tools/__init__.py that intercepts failed attribute access
• Provides helpful error messages when users mistype tool names with lowercase 't' (e.g., CSVSearchtool → suggests CSVSearchTool)
• Special handling for PGSearchTool which is documented but not yet implemented - provides clear "under development" message
• Added comprehensive test suite (test_import_errors.py) with 5 test cases covering typos, non-implemented tools, and non-existent tools

Example error messages:

# Before: AttributeError: module 'crewai_tools' has no attribute 'PGSearchtool'
# After: ImportError: Cannot import name 'PGSearchtool' from 'crewai_tools'. Did you mean 'PGSearchTool'? Note: Tool names use capital 'T' in 'Tool'.

# For PGSearchTool: NotImplementedError: 'PGSearchTool' is currently under development and not yet available. Please check the CrewAI documentation for updates on when this tool will be released.

Review & Testing Checklist for Human

• Test actual import behavior: Run a Python script that tries from crewai_tools import PGSearchtool and from crewai_tools import PGSearchTool to verify the error messages display correctly in real usage (not just with getattr())
• Verify PGSearchTool status: Confirm that "under development" is the correct messaging for PGSearchTool, or if it should say something else (deprecated, removed, etc.)
• Check for regressions: Import a few existing tools (e.g., CSVSearchTool, FileReadTool) to ensure the __getattr__ doesn't interfere with normal imports
• Consider other tools: Check if there are other documented-but-not-implemented tools that should get similar treatment

Test Plan

# Test script to run manually:
import crewai_tools

# Should work fine
from crewai_tools import CSVSearchTool
print("✓ CSVSearchTool imported successfully")

# Should show helpful typo error
try:
    from crewai_tools import CSVSearchtool
except ImportError as e:
    print(f"✓ Typo caught: {e}")

# Should show "under development" error  
try:
    from crewai_tools import PGSearchTool
except NotImplementedError as e:
    print(f"✓ Not implemented: {e}")

Notes

• All existing tests pass (193 passed in crewai-tools test suite)
• The fix uses Python's module-level __getattr__ which is called when an attribute doesn't exist in the module
• Link to Devin session: https://app.devin.ai/sessions/ccfa1934ee864505bbbc508931e5f571
• Requested by: João (joao@crewai.com)

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