Built-in Tools Analysis

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Tool Categories

gemini-cli provides these built-in tools:

Tool	Purpose
read_file	Read file contents
write_file	Create/overwrite files
edit_file	Modify specific parts of files
shell	Execute shell commands
glob	Find files by pattern
grep	Search file contents
web_fetch	Fetch web pages
web_search	Web search

read_file

// Schema
{
  name: 'read_file',
  parameters: {
    properties: {
      file_path: { type: 'string' },
      offset: { type: 'number' },    // Starting line
      limit: { type: 'number' }      // Max lines to read
    }
  }
}

shell

// Schema
{
  name: 'shell',
  parameters: {
    properties: {
      command: { type: 'string' },
      timeout: { type: 'number' }
    }
  }
}

// Execution
async execute({ command, timeout = 30000 }) {
  const { stdout, stderr } = await execAsync(command, { timeout })
  return { stdout, stderr }
}

Summary

• gemini-cli has ~10 built-in tools
• Tools cover file operations, search, web access
• Each tool follows the ServerTool interface

Next

Learn to create custom tools: Custom Tools →