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Filesystem Skill

filesystem

File system operations guidance - read, write, search, and manage files using Claude Code's built-in tools.

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SKILL.md

Full skill instructions

Filesystem Skill

<identity> Filesystem Skill - Guidance for file system operations using Claude Code's built-in tools. Read, write, search, and manage files efficiently. </​identity> <capabilities> - Reading single or multiple files - Creating or modifying files - Searching for files by pattern - Searching file contents - Directory navigation </​capabilities> <instructions> <execution_process>

Claude Code Built-in Tools

Reading Files

Read Tool: Read file contents

Read file_path="/​path/​to/​file.txt"

Options:

  • offset: Start line (for large files)
  • limit: Number of lines to read

Finding Files

Glob Tool: Find files by pattern

Glob pattern="**/​*.ts"

Common patterns:

  • **/​*.ts - All TypeScript files
  • src/​**/​*.tsx - React components in src
  • **/​test*.js - Test files anywhere

Searching Content

Grep Tool: Search file contents

Grep pattern="function myFunc" path="/​src"

Options:

  • output_mode: "content", "files_with_matches", or "count"
  • -A, -B, -C: Context lines

Writing Files

Write Tool: Create or overwrite files

Write file_path="/​path/​to/​file.txt" content="..."

Edit Tool: Modify existing files

Edit file_path="/​path/​to/​file.txt" old_string="..." new_string="..."

Directory Operations

Bash Tool: For directory operations

# List directory
ls -la /​path/​to/​dir

# Create directory
mkdir -p /​path/​to/​new/​dir

# Move/​rename
mv /​old/​path /​new/​path

</​execution_process>

<best_practices>

Common Workflows

Reading Multiple Files

# Read files in parallel (multiple Read calls in one message)
Read file_path="/​src/​app.ts"
Read file_path="/​src/​config.ts"
Read file_path="/​src/​utils.ts"

Search and Read

# 1. Find files
Glob pattern="**/​*.config.ts"

# 2. Read matching files
Read file_path="/​path/​from/​glob/​result"

Find and Replace

# 1. Search for pattern
Grep pattern="oldFunction" path="/​src"

# 2. Edit each file
Edit file_path="/​src/​file.ts" old_string="oldFunction" new_string="newFunction"

Best Practices

  1. Read Before Edit: Always read a file before editing it
  2. Use Glob Over Bash: Prefer Glob to find for file discovery
  3. Use Grep Over Bash: Prefer Grep to grep for searching
  4. Parallel Reads: Read multiple files in one message for speed
  5. Verify Changes: Read file after editing to verify

</​best_practices> </​instructions>

<examples> <usage_example> **Find and read all TypeScript files**: 
Glob pattern="src/​**/​*.ts"
# Then read the results
Read file_path="/​src/​app.ts"

</​usage_example>

<usage_example> Search for a function and edit it:

Grep pattern="export function oldName" path="/​src"
# Found in /​src/​utils.ts:23

Edit file_path="/​src/​utils.ts" old_string="export function oldName" new_string="export function newName"

</​usage_example> </​examples>

Rules

  • Always read files before editing
  • Use built-in tools (Read, Glob, Grep) instead of bash equivalents
  • Verify changes after editing

Memory Protocol (MANDATORY)

Before starting:

cat .claude/​context/​memory/​learnings.md

After completing:

  • New pattern -> .claude/​context/​memory/​learnings.md
  • Issue found -> .claude/​context/​memory/​issues.md
  • Decision made -> .claude/​context/​memory/​decisions.md

ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.