Tool Use Overview

Kilo Code implements a sophisticated tool system that allows AI models to interact with your development environment in a controlled and secure manner. This document explains how tools work, when they're called, and how they're managed.

Core Concepts

Tool Groups

Tool Calling Mechanism

When Tools Are Called

Tools are invoked under specific conditions:

1. Direct Task Requirements

   • When specific actions are needed to complete a task as decided by the LLM
   • In response to user requests
   • During automated workflows

2. Mode-Based Availability

   • Different modes enable different tool sets
   • Mode switches can trigger tool availability changes
   • Some tools are restricted to specific modes

3. Context-Dependent Calls

   • Based on the current state of the workspace
   • In response to system events
   • During error handling and recovery

Decision Process

The system uses a multi-step process to determine tool availability:

1. Mode Validation

   isToolAllowedForMode(
       tool: string,
       modeSlug: string,
       customModes: ModeConfig[],
       toolRequirements?: Record<string, boolean>,
       toolParams?: Record<string, any>
   )
   

2. Requirement Checking

   • System capability verification
   • Resource availability
   • Permission validation

3. Parameter Validation

   • Required parameter presence
   • Parameter type checking
   • Value validation

Technical Implementation

Tool Call Processing

1. Initialization

   • Tool name and parameters are validated
   • Mode compatibility is checked
   • Requirements are verified

2. Execution

   const toolCall = {
     type: "tool_call",
     name: chunk.name,
     arguments: chunk.input,
     callId: chunk.callId,
   }
   

3. Result Handling

   • Success/failure determination
   • Result formatting
   • Error handling

Security and Permissions

1. Access Control

   • File system restrictions
   • Command execution limitations
   • Network access controls

2. Validation Layers

   • Tool-specific validation
   • Mode-based restrictions
   • System-level checks

Mode Integration

Mode-Based Tool Access

Tools are made available based on the current mode:

• Code Mode: Full access to file system tools, code editing capabilities, command execution
• Ask Mode: Limited to reading tools, information gathering capabilities, no file system modifications
• Architect Mode: Design-focused tools, documentation capabilities, limited execution rights
• Custom Modes: Can be configured with specific tool access for specialized workflows

Mode Switching

1. Process

   • Current mode state preservation
   • Tool availability updates
   • Context switching

2. Impact on Tools

   • Tool set changes
   • Permission adjustments
   • Context preservation

Best Practices

Tool Usage Guidelines

1. Efficiency

   • Use the most specific tool for the task
   • Avoid redundant tool calls
   • Batch operations when possible

2. Security

   • Validate inputs before tool calls
   • Use minimum required permissions
   • Follow security best practices

3. Error Handling

   • Implement proper error checking
   • Provide meaningful error messages
   • Handle failures gracefully

Common Patterns

1. Information Gathering

   [ask_followup_question](/docs/automate/tools/ask-followup-question) → [read_file](/docs/automate/tools/read-file) → [search_files](/docs/automate/tools/search-files)
   

2. Code Modification

   [read_file](/docs/automate/tools/read-file) → [apply_diff](/docs/automate/tools/apply-diff) → [attempt_completion](/docs/automate/tools/attempt-completion)
   

3. Task Management

   [new_task](/docs/automate/tools/new-task) → [switch_mode](/docs/automate/tools/switch-mode) → [execute_command](/docs/automate/tools/execute-command)
   

4. Progress Tracking

   [update_todo_list](/docs/automate/tools/update-todo-list) → [execute_command](/docs/automate/tools/execute-command) → [update_todo_list](/docs/automate/tools/update-todo-list)
   

Error Handling and Recovery

Error Types

1. Tool-Specific Errors

   • Parameter validation failures
   • Execution errors
   • Resource access issues

2. System Errors

   • Permission denied
   • Resource unavailable
   • Network failures

3. Context Errors

   • Invalid mode for tool
   • Missing requirements
   • State inconsistencies

Recovery Strategies

1. Automatic Recovery

   • Retry mechanisms
   • Fallback options
   • State restoration

2. User Intervention

   • Error notifications
   • Recovery suggestions
   • Manual intervention options