Add comprehensive MCP agent management tools with filesystem integration

[epuerta9]

Summary

• Added 4 new MCP tools for complete agent management via Claude Code and other MCP clients
• Full database integration with proper validation and error handling
• Filesystem export functionality matching CLI behavior exactly

New MCP Tools Added

1. update_agent_prompt - Update an agent's system prompt
2. add_tool - Add individual tools to an agent
3. remove_tool - Remove individual tools from an agent
4. export_agent - Export agent configuration to dotprompt format with filesystem write

Technical Implementation

• Database Integration: Added UpdatePrompt method to AgentRepo with SQLC query
• MCP Server: Added 4 tools to tools_setup.go (now 15 total tools)
• Handler Functions: Complete implementation in handlers_fixed.go with comprehensive error handling
• Filesystem Export: Writes to ~/.config/station/environments/{env}/agents/ like CLI
• Directory Creation: Automatic parent directory creation with proper permissions

Testing Results

✅ All 4 tools tested and verified working with live database
✅ Export tool writes files to filesystem correctly
✅ Proper validation and error handling for all edge cases
✅ Complete feature parity with Station CLI

Test Plan

• Verify all 4 MCP tools are available via tools/list
• Test update_agent_prompt with database updates
• Test add_tool and remove_tool with agent-tool relationships
• Test export_agent with filesystem write to correct location
• Verify proper error handling for invalid inputs
• Confirm exported dotprompt files match CLI export format

🤖 Generated with Claude Code

[epuerta9]

🚀 Ready for merge! All MCP agent management tools are fully implemented and tested:

Key Features Verified:

• ✅ update_agent_prompt: Successfully updates agent system prompts
• ✅ add_tool/remove_tool: Manages agent-tool relationships in real-time
• ✅ export_agent: Writes dotprompt files to filesystem matching CLI exactly

Database Operations: All CRUD operations working with proper validation
Filesystem Integration: Export creates files in correct GitOps location
Error Handling: Comprehensive validation for all edge cases

These tools provide complete feature parity with Station CLI, enabling full agent management through MCP clients like Claude Code! 🎯