Claude Code Built-in Tools Mastery

Master the Read tool's exact behavior: line offsets, character limits, permission requirements, and when Read is preferred over Bash cat commands.

Learn Write tool parameters, file creation behavior, encoding handling, and best practices for creating new files without accidental overwrites.

Understand the critical Read-before-Write requirement, how Edit handles different file types, and strategies for making precise modifications to existing code.

Learn how Claude Code handles file permissions, what happens with read-only files, and how to configure tools to work with restricted filesystems.

Real-world examples of file operations gone wrong and how to avoid them. Learn when to use Read vs Edit, and how to handle large files efficiently.

Practical exercise: Create a skill that reads configuration files, modifies specific sections, and writes updates safely. Includes error handling and validation.

Master Glob pattern syntax including wildcards, character classes, and directory matching. Learn performance characteristics and when Glob is the right choice.

Learn negation patterns, directory exclusions, and complex matching scenarios. Real examples of finding files across nested directory structures.

Understand Grep's regex engine, output modes (line numbers, context lines), and how to construct effective search patterns for code and text files.

Decision framework for when to use Grep vs Glob based on task requirements, performance needs, and result formatting. Includes performance benchmarks.

Learn to chain Glob and Grep with Read/Edit operations to build powerful file discovery and modification workflows. Real example: bulk code refactoring.

Create a custom skill that searches across your codebase, finds patterns, and provides context-aware results with file previews and navigation.

Understand how Bash commands execute, timeout behavior, background processes, and how output is captured and formatted for Claude's context.

Learn about sandbox modes, excluded commands, network restrictions, and how Claude Code prevents potentially harmful operations while enabling legitimate automation.

Master handling command output, interpreting exit codes, and building robust workflows that respond appropriately to success and failure conditions.

Learn techniques for managing long-running processes, background tasks, and how to interact with services that continue after command completion.

Common problems with Bash tool execution and how to solve them: permission denied errors, timeout issues, and output parsing problems.

Create a skill that runs build commands, handles errors gracefully, and provides real-time feedback on deployment status using Bash tool capabilities.

Learn WebFetch's capabilities, how it handles different content types, prompt-based extraction, and permission patterns for accessing external resources.

Master search query syntax, domain filtering, result pagination, and how to work with search results effectively in your automation workflows.

Understand what WebFetch and WebSearch cannot do, network restrictions, rate limiting, and how to configure permissions for web access.

Learn to fetch web content and save it to files, extract structured data, and build workflows that combine online research with local processing.

Create a skill that searches for information, fetches relevant pages, extracts key insights, and compiles research reports automatically.

Understand when to use subagents, how to select models for tasks, and best practices for passing context between main agents and subagents.

Learn how subagents communicate results back to the main agent, handle errors in sub-tasks, and coordinate multiple parallel subagent executions.

Master using TodoWrite to create, update, and track tasks programmatically. Learn how to integrate todos into skills for complex multi-step workflows.

Decision framework for choosing between subagents and direct tool execution based on task complexity, isolation needs, and resource constraints.

Create a workflow that uses subagents for code review, testing, and documentation generation, then aggregates results into a comprehensive report.

Master the exact evaluation order of permission rules, how allow/ask/deny patterns interact, and how to debug permission conflicts effectively.

Understand how additionalDirectories works, filesystem access boundaries, and how to configure Claude Code to work across multiple project directories.

Learn to use glob patterns in deny rules to protect credentials, secrets, and sensitive configuration files from accidental or malicious access.

Understand different sandbox modes, how to configure security levels for different use cases, and balance safety with functionality requirements.

Create a comprehensive permission configuration for a team environment that protects sensitive data while enabling productive automation workflows.

Learn to intercept tool calls before execution, read tool context and parameters, and block execution with custom exit codes and error messages.

Master reacting to tool execution results, triggering follow-up actions, logging, and modifying behavior based on tool outcomes.

Understand hook matcher syntax for targeting specific tools, file patterns, and command types. Learn to create precise hook triggers.

Learn critical techniques for preventing hook recursion, managing settings inheritance in hooks, and ensuring hooks don't interfere with each other.

Explore advanced hook techniques: validation pipelines, automated testing triggers, compliance checks, and custom logging systems.

Create a hook system that validates file modifications, enforces coding standards, and prevents certain operations based on your team's requirements.

Learn to chain tools together with confidence, handle errors at each step, and create workflows that produce consistent, reproducible results.

Move beyond relying on agent inference, learn to reference specific tools in skill definitions for predictable, controlled automation behavior.

Systematic approach to debugging: which tool is being called, why it's failing, and how to trace problems through the execution stack.

Learn to choose the most efficient tool for each task, optimize execution order, and reduce latency in complex multi-step workflows.

Create a comprehensive automation that uses file operations, search tools, bash commands, and hooks to implement a full CI/CD pipeline for a sample project.

Learn strategies for testing automation workflows, validating outputs, and ensuring your skills work correctly across different environments and conditions.

Configure enterprise-wide settings, manage team permissions, and implement organizational policies that scale across multiple users and projects.

Set up shared repositories for hooks and skills, manage versioning, and enable team collaboration on automation tools and workflows.

Implement logging and monitoring for tool execution, track usage patterns, and gather insights for optimizing team workflows.

Learn to audit tool permissions, review hook configurations, and ensure your Claude Code setup meets organizational security and compliance requirements.

Create a complete team deployment package with standardized skills, hooks, and permissions that can be distributed and maintained across your organization.

Review key concepts, explore advanced topics for further learning, and learn how to stay updated with new tool capabilities and best practices.