## 1. Database Migration

- [ ] 1.1 Create Alembic migration to add new columns to tool_configs table
- [ ] 1.2 Add columns: start_command (text), port (integer), working_directory (text), environment_variables (jsonb), volumes (jsonb)
- [ ] 1.3 Run migration locally and verify

## 2. Backend Model Updates

- [ ] 2.1 Update ToolConfig model with new fields
- [ ] 2.2 Update Pydantic schemas (ToolConfigCreate, ToolConfigResponse)
- [ ] 2.3 Add validation for port range (1-65535)
- [ ] 2.4 Add JSON validation for environment_variables and volumes

## 3. Backend API Updates

- [ ] 3.1 Update list_configs endpoint to return new fields
- [ ] 3.2 Update create_config endpoint to accept new fields
- [ ] 3.3 Update update_config endpoint to handle new fields
- [ ] 3.4 Add validation error handling with clear messages

## 4. Frontend Types and API

- [ ] 4.1 Update ToolConfig interface with new fields
- [ ] 4.2 Update API client functions to handle new fields
- [ ] 4.3 Add type definitions for JSON fields

## 5. Frontend UI - Split Pane Layout

- [ ] 5.1 Create split-pane layout component (left list, right detail)
- [ ] 5.2 Implement left panel: scrollable list grouped by tool type
- [ ] 5.3 Implement right panel: detail/edit form with tabs/sections
- [ ] 5.4 Add responsive design (stack on mobile)
- [ ] 5.5 Add "New Config" button and blank form state

## 6. Frontend UI - Form Fields

- [ ] 6.1 Add Basic section: key, value, config_type, file_path
- [ ] 6.2 Add Runtime section: start_command, port, working_directory
- [ ] 6.3 Add Advanced section: environment_variables (JSON editor)
- [ ] 6.4 Add Advanced section: volumes (JSON editor)
- [ ] 6.5 Implement JSON validation with visual feedback
- [ ] 6.6 Add form validation and error display

## 7. Integration and Testing

- [ ] 7.1 Test creating config with all new fields
- [ ] 7.2 Test updating existing config
- [ ] 7.3 Test JSON validation (valid/invalid cases)
- [ ] 7.4 Test responsive layout on different screen sizes
- [ ] 7.5 Verify backward compatibility with old configs

## 8. Quality Gates

- [ ] 8.1 Run backend linting (ruff)
- [ ] 8.2 Run backend type checking (mypy)
- [ ] 8.3 Run frontend type checking (tsc)
- [ ] 8.4 Run frontend linting (eslint)
- [ ] 8.5 Build frontend and verify
- [ ] 8.6 Commit and push changes