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Claude Code Internal Tools - Technical Reference

Complete technical documentation of Claude Code's internal tools

This document provides comprehensive technical details about Claude Code's internal tools, including parameter schemas, implementation behaviors, and usage patterns.

Claude Sonnet 4.5

Technical Details:

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Task

Launch a new agent that has access to the following tools: Bash, Glob, Grep, LS, exit_plan_mode, Read, Edit, MultiEdit, Write, NotebookRead, NotebookEdit, WebFetch, TodoRead, TodoWrite, WebSearch. When you are searching for a keyword or file and are not confident that you will find the right match in the first few tries, use the Agent tool to perform the search for you.

When to use the Agent tool:

• If you are searching for a keyword like "config" or "logger", or for questions like "which file does X?", the Agent tool is strongly recommended

When NOT to use the Agent tool:

• If you want to read a specific file path, use the Read or Glob tool instead of the Agent tool, to find the match more quickly
• If you are searching for a specific class definition like "class Foo", use the Glob tool instead, to find the match more quickly
• If you are searching for code within a specific file or set of 2-3 files, use the Read tool instead of the Agent tool, to find the match more quickly

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Bash / Unix admin

https://www.cheatsheet.wtf/Nano/

• useful prompt (when working in git repos):

# Show Git branch in the prompt
parse_git_branch() {
git branch 2>/dev/null | grep '*' | sed 's/* //'

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function rgo() {
  local input="rg --column --line-number --no-heading --color=always --smart-case --"
  : | fzf --ansi --disabled --query "${*:-}" \
      --bind "start:reload:$input {q}" \
      --bind "change:reload:sleep 0.1; $input {q} || true" \
      --delimiter : \
      --preview 'bat --color=always {1} --highlight-line {2}' \
      --preview-window 'up,60%,border-bottom,+{2}+3/3,~3' \
      --bind "enter:become($VISUAL {1})"
}

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#!/bin/bash
# Claude Code (cc) Commands for .bashrc
# Quick tmux-based session management for Claude Code

# Context directories
_CC_HA="$HOME/pezbox/infra/homeAssistant"
_CC_HW="$HOME/pezbox/hiveworth"
_CC_RS="$HOME/pezbox/redfin-scraper"

# Resolve context name to directory

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devup() {
    git submodule update --init --recursive

    local container_id=$(docker ps -aq --filter "label=devcontainer.local_folder=$(pwd)")

    if [[ -z "$container_id" ]]; then
        # No container exists, create it
        devcontainer up --workspace-folder . --skip-post-create
        container_id=$(docker ps -aq --filter "label=devcontainer.local_folder=$(pwd)")
    elif [[ -z $(docker ps -q --filter "id=$container_id") ]]; then

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#!/usr/bin/env python3
# /// script
# requires-python = ">=3.13"
# dependencies = []
# ///
import argparse
import base64
import json
import os
import select

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#!/bin/bash
# Claude Code StatusLine for Swarm CTL
# Displays: tmux_session | Model | Context usage bar

set -euo pipefail

# Read JSON input from stdin
input=$(cat)

# Extract values using jq

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#!/usr/bin/python
import argparse
import json
import os
import re
import subprocess
import time
from pathlib import Path
from typing import Any, Optional

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Claude Code Hooks + tmux Pane Focus Setup

Auto-focus the correct terminal pane when Claude Code finishes a task or needs your input. Shows macOS notifications with sound.

Prerequisites

• Claude Code CLI installed
• jq installed (brew install jq)
• macOS (uses osascript for notifications)