diff --git a/CLAUDE.md b/CLAUDE.md
index 8efdc92..0c546c6 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -6,7 +6,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 This is the Ralph for Claude Code repository - an autonomous AI development loop system that enables continuous development cycles with intelligent exit detection and rate limiting.
 
-**Version**: v0.9.2 | **Tests**: 151 passing (100% pass rate) | **CI/CD**: GitHub Actions
+**Version**: v0.9.3 | **Tests**: 165 passing (100% pass rate) | **CI/CD**: GitHub Actions
 
 ## Core Architecture
 
@@ -95,7 +95,7 @@ tmux attach -t <session-name>
 
 ### Running Tests
 ```bash
-# Run all tests (151 tests)
+# Run all tests (165 tests)
 npm test
 
 # Run specific test suites
@@ -272,7 +272,7 @@ Ralph uses advanced error detection with two-stage filtering to eliminate false
 
 ## Test Suite
 
-### Test Files (151 tests total)
+### Test Files (165 tests total)
 
 | File | Tests | Description |
 |------|-------|-------------|
@@ -283,6 +283,7 @@ Ralph uses advanced error detection with two-stage filtering to eliminate false
 | `test_rate_limiting.bats` | 15 | Rate limiting behavior |
 | `test_loop_execution.bats` | 20 | Integration tests |
 | `test_edge_cases.bats` | 20 | Edge case handling |
+| `test_installation.bats` | 14 | Global installation/uninstall workflows |
 
 ### Running Tests
 ```bash
@@ -298,6 +299,17 @@ bats tests/unit/test_cli_parsing.bats
 
 ## Recent Improvements
 
+### Installation Tests (v0.9.3)
+- Added 14 comprehensive tests for `install.sh` global installation script
+- Tests cover: directory creation, command installation, template copying, lib copying
+- Dependency detection tests (jq, git, node) with mocked failures
+- PATH detection and warning system tests
+- Uninstallation cleanup verification
+- Idempotency testing (run twice without errors)
+- End-to-end installation workflow validation
+- All tests use isolated temp directories (no system modifications)
+- Test count: 165 (up from 151)
+
 ### Prompt File Fix (v0.9.2)
 - Fixed critical bug: replaced non-existent `--prompt-file` CLI flag with `-p` flag
 - Modern CLI mode now correctly passes prompt content via `CLAUDE_CMD_ARGS+=("-p" "$prompt_content")`
diff --git a/package.json b/package.json
index 9c8281b..1cda569 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "test": "tests"
   },
   "scripts": {
-    "test": "bats tests/",
+    "test": "bats tests/unit/ tests/integration/",
     "test:unit": "bats tests/unit/",
     "test:integration": "bats tests/integration/",
     "test:e2e": "bats tests/e2e/"
diff --git a/tests/integration/test_installation.bats b/tests/integration/test_installation.bats
new file mode 100644
index 0000000..0ce17a5
--- /dev/null
+++ b/tests/integration/test_installation.bats
@@ -0,0 +1,542 @@
+#!/usr/bin/env bats
+# Integration tests for Ralph install.sh - Global Installation Script
+
+load '../helpers/test_helper'
+load '../helpers/mocks'
+load '../helpers/fixtures'
+
+# Store original values
+ORIGINAL_HOME="$HOME"
+ORIGINAL_PATH="$PATH"
+PROJECT_ROOT=""
+
+setup() {
+    # Save project root for sourcing install.sh
+    PROJECT_ROOT="${BATS_TEST_DIRNAME}/../.."
+
+    # Create unique temp directories for isolated testing
+    export TEST_HOME="$(mktemp -d)"
+    export TEST_INSTALL_DIR="$TEST_HOME/.local/bin"
+    export TEST_RALPH_HOME="$TEST_HOME/.ralph"
+
+    # Override HOME to isolate tests
+    export HOME="$TEST_HOME"
+
+    # Create mock source directories with required files
+    export MOCK_SOURCE_DIR="$(mktemp -d)"
+    mkdir -p "$MOCK_SOURCE_DIR/templates/specs"
+    mkdir -p "$MOCK_SOURCE_DIR/lib"
+
+    # Create mock template files
+    echo "# Mock PROMPT.md" > "$MOCK_SOURCE_DIR/templates/PROMPT.md"
+    echo "# Mock fix_plan.md" > "$MOCK_SOURCE_DIR/templates/fix_plan.md"
+    echo "# Mock AGENT.md" > "$MOCK_SOURCE_DIR/templates/AGENT.md"
+
+    # Create mock lib files
+    cat > "$MOCK_SOURCE_DIR/lib/circuit_breaker.sh" << 'EOF'
+#!/bin/bash
+# Mock circuit_breaker.sh
+init_circuit_breaker() { :; }
+EOF
+
+    cat > "$MOCK_SOURCE_DIR/lib/response_analyzer.sh" << 'EOF'
+#!/bin/bash
+# Mock response_analyzer.sh
+analyze_response() { :; }
+EOF
+
+    cat > "$MOCK_SOURCE_DIR/lib/date_utils.sh" << 'EOF'
+#!/bin/bash
+# Mock date_utils.sh
+get_iso_timestamp() { date -Iseconds; }
+EOF
+
+    # Create mock main scripts
+    cat > "$MOCK_SOURCE_DIR/ralph_loop.sh" << 'EOF'
+#!/bin/bash
+# Mock ralph_loop.sh
+echo "Ralph loop running"
+EOF
+
+    cat > "$MOCK_SOURCE_DIR/ralph_monitor.sh" << 'EOF'
+#!/bin/bash
+# Mock ralph_monitor.sh
+echo "Ralph monitor running"
+EOF
+
+    cat > "$MOCK_SOURCE_DIR/ralph_import.sh" << 'EOF'
+#!/bin/bash
+# Mock ralph_import.sh
+echo "Ralph import running"
+EOF
+
+    chmod +x "$MOCK_SOURCE_DIR"/*.sh
+    chmod +x "$MOCK_SOURCE_DIR/lib"/*.sh
+}
+
+teardown() {
+    # Restore original environment
+    export HOME="$ORIGINAL_HOME"
+    export PATH="$ORIGINAL_PATH"
+
+    # Clean up test directories
+    if [[ -n "$TEST_HOME" && -d "$TEST_HOME" ]]; then
+        rm -rf "$TEST_HOME"
+    fi
+
+    if [[ -n "$MOCK_SOURCE_DIR" && -d "$MOCK_SOURCE_DIR" ]]; then
+        rm -rf "$MOCK_SOURCE_DIR"
+    fi
+}
+
+# Helper: Source install.sh functions for testing
+# This overrides SCRIPT_DIR to use our mock source
+source_install_functions() {
+    # Override SCRIPT_DIR before sourcing
+    export SCRIPT_DIR="$MOCK_SOURCE_DIR"
+    export INSTALL_DIR="$TEST_INSTALL_DIR"
+    export RALPH_HOME="$TEST_RALPH_HOME"
+
+    # Source only functions, not main execution
+    source <(grep -E '^(log|check_dependencies|create_install_dirs|install_scripts|install_ralph_loop|install_setup|check_path)\s*\(\)|^(log|check_dependencies|create_install_dirs|install_scripts|install_ralph_loop|install_setup|check_path)\(\)|^[A-Z_]+=|^function ' "$PROJECT_ROOT/install.sh" | head -100)
+
+    # Re-source with sed to extract functions
+    eval "$(sed -n '/^log()/,/^}/p' "$PROJECT_ROOT/install.sh")"
+    eval "$(sed -n '/^create_install_dirs()/,/^}/p' "$PROJECT_ROOT/install.sh")"
+    eval "$(sed -n '/^check_path()/,/^}/p' "$PROJECT_ROOT/install.sh")"
+}
+
+# Helper: Run install.sh in isolated environment
+run_install() {
+    local action="${1:-install}"
+
+    # Set up environment for isolated install
+    export SCRIPT_DIR="$MOCK_SOURCE_DIR"
+
+    # Create a modified install.sh that uses our mock paths
+    local temp_install="$(mktemp)"
+    sed -e "s|INSTALL_DIR=\"\$HOME/.local/bin\"|INSTALL_DIR=\"$TEST_INSTALL_DIR\"|g" \
+        -e "s|RALPH_HOME=\"\$HOME/.ralph\"|RALPH_HOME=\"$TEST_RALPH_HOME\"|g" \
+        -e "s|SCRIPT_DIR=\"\$(cd \"\$(dirname \"\${BASH_SOURCE\[0\]}\")\" && pwd)\"|SCRIPT_DIR=\"$MOCK_SOURCE_DIR\"|g" \
+        "$PROJECT_ROOT/install.sh" > "$temp_install"
+
+    chmod +x "$temp_install"
+
+    # Run with specified action
+    if [[ "$action" == "install" ]]; then
+        bash "$temp_install" install 2>&1
+    else
+        bash "$temp_install" "$action" 2>&1
+    fi
+    local exit_code=$?
+
+    rm -f "$temp_install"
+    return $exit_code
+}
+
+# =============================================================================
+# Test 1-2: Directory Creation Tests
+# =============================================================================
+
+@test "install.sh creates ~/.ralph directory" {
+    run run_install
+
+    # Check main ralph directory was created
+    assert_dir_exists "$TEST_RALPH_HOME"
+
+    # Check subdirectories
+    assert_dir_exists "$TEST_RALPH_HOME/templates"
+    assert_dir_exists "$TEST_RALPH_HOME/lib"
+}
+
+@test "install.sh creates ~/.local/bin directory" {
+    run run_install
+
+    # Check bin directory was created
+    assert_dir_exists "$TEST_INSTALL_DIR"
+
+    # Verify directory has correct permissions (should be accessible)
+    [[ -x "$TEST_INSTALL_DIR" ]]
+}
+
+# =============================================================================
+# Test 3-4: Command Installation Tests
+# =============================================================================
+
+@test "install.sh creates ~/.local/bin commands" {
+    run run_install
+
+    # Check all four wrapper commands exist
+    assert_file_exists "$TEST_INSTALL_DIR/ralph"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-monitor"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-setup"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-import"
+
+    # Verify each command contains proper shebang
+    grep -q "#!/bin/bash" "$TEST_INSTALL_DIR/ralph"
+    grep -q "#!/bin/bash" "$TEST_INSTALL_DIR/ralph-monitor"
+    grep -q "#!/bin/bash" "$TEST_INSTALL_DIR/ralph-setup"
+    grep -q "#!/bin/bash" "$TEST_INSTALL_DIR/ralph-import"
+}
+
+@test "install.sh sets executable permissions" {
+    run run_install
+
+    # Verify executable bit on all commands
+    [[ -x "$TEST_INSTALL_DIR/ralph" ]]
+    [[ -x "$TEST_INSTALL_DIR/ralph-monitor" ]]
+    [[ -x "$TEST_INSTALL_DIR/ralph-setup" ]]
+    [[ -x "$TEST_INSTALL_DIR/ralph-import" ]]
+
+    # Verify executable bit on main scripts
+    [[ -x "$TEST_RALPH_HOME/ralph_loop.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/ralph_monitor.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/setup.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/ralph_import.sh" ]]
+
+    # Verify lib scripts are executable
+    [[ -x "$TEST_RALPH_HOME/lib/circuit_breaker.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/lib/response_analyzer.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/lib/date_utils.sh" ]]
+}
+
+# =============================================================================
+# Test 5-6: Template and Library Copying Tests
+# =============================================================================
+
+@test "install.sh copies templates correctly" {
+    run run_install
+
+    # Check template files were copied
+    assert_file_exists "$TEST_RALPH_HOME/templates/PROMPT.md"
+    assert_file_exists "$TEST_RALPH_HOME/templates/fix_plan.md"
+    assert_file_exists "$TEST_RALPH_HOME/templates/AGENT.md"
+
+    # Verify content matches source
+    diff -q "$MOCK_SOURCE_DIR/templates/PROMPT.md" "$TEST_RALPH_HOME/templates/PROMPT.md"
+    diff -q "$MOCK_SOURCE_DIR/templates/fix_plan.md" "$TEST_RALPH_HOME/templates/fix_plan.md"
+    diff -q "$MOCK_SOURCE_DIR/templates/AGENT.md" "$TEST_RALPH_HOME/templates/AGENT.md"
+}
+
+@test "install.sh copies lib/ directory" {
+    run run_install
+
+    # Check lib files were copied
+    assert_file_exists "$TEST_RALPH_HOME/lib/circuit_breaker.sh"
+    assert_file_exists "$TEST_RALPH_HOME/lib/response_analyzer.sh"
+    assert_file_exists "$TEST_RALPH_HOME/lib/date_utils.sh"
+
+    # Verify files are executable
+    [[ -x "$TEST_RALPH_HOME/lib/circuit_breaker.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/lib/response_analyzer.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/lib/date_utils.sh" ]]
+}
+
+# =============================================================================
+# Test 7-8: Dependency Detection Tests
+# =============================================================================
+
+@test "install.sh detects missing dependencies (jq, git, node)" {
+    # Create a modified install.sh with mocked command -v
+    local temp_script="$(mktemp)"
+
+    cat > "$temp_script" << 'EOF'
+#!/bin/bash
+set -e
+
+# Override command to simulate missing jq
+command() {
+    if [[ "$1" == "-v" && "$2" == "jq" ]]; then
+        return 1
+    fi
+    builtin command "$@"
+}
+
+# Mock check_dependencies from install.sh
+check_dependencies() {
+    local missing_deps=()
+
+    if ! command -v node &> /dev/null && ! command -v npx &> /dev/null; then
+        missing_deps+=("Node.js/npm")
+    fi
+
+    if ! command -v jq &> /dev/null; then
+        missing_deps+=("jq")
+    fi
+
+    if ! command -v git &> /dev/null; then
+        missing_deps+=("git")
+    fi
+
+    if [ ${#missing_deps[@]} -ne 0 ]; then
+        echo "ERROR: Missing required dependencies: ${missing_deps[*]}"
+        exit 1
+    fi
+
+    echo "SUCCESS: Dependencies check completed"
+}
+
+check_dependencies
+EOF
+    chmod +x "$temp_script"
+
+    # Run and expect failure
+    run bash "$temp_script"
+
+    # Should fail
+    [[ "$status" -ne 0 ]]
+
+    # Should mention missing dependencies
+    [[ "$output" =~ "Missing required dependencies" ]] || [[ "$output" =~ "jq" ]]
+
+    rm -f "$temp_script"
+}
+
+@test "install.sh detects all dependencies present" {
+    # Skip if actual dependencies are missing
+    if ! command -v node &> /dev/null && ! command -v npx &> /dev/null; then
+        skip "Node.js not available"
+    fi
+    if ! command -v jq &> /dev/null; then
+        skip "jq not available"
+    fi
+    if ! command -v git &> /dev/null; then
+        skip "git not available"
+    fi
+
+    # Create a test script that checks dependencies
+    local temp_script="$(mktemp)"
+
+    cat > "$temp_script" << 'EOF'
+#!/bin/bash
+
+check_dependencies() {
+    local missing_deps=()
+
+    if ! command -v node &> /dev/null && ! command -v npx &> /dev/null; then
+        missing_deps+=("Node.js/npm")
+    fi
+
+    if ! command -v jq &> /dev/null; then
+        missing_deps+=("jq")
+    fi
+
+    if ! command -v git &> /dev/null; then
+        missing_deps+=("git")
+    fi
+
+    if [ ${#missing_deps[@]} -ne 0 ]; then
+        echo "ERROR: Missing required dependencies: ${missing_deps[*]}"
+        exit 1
+    fi
+
+    echo "Dependencies OK"
+    exit 0
+}
+
+check_dependencies
+EOF
+    chmod +x "$temp_script"
+
+    run bash "$temp_script"
+
+    # Should succeed
+    assert_success
+
+    rm -f "$temp_script"
+}
+
+# =============================================================================
+# Test 9-10: PATH Detection Tests
+# =============================================================================
+
+@test "install.sh PATH detection warns when not in PATH" {
+    # Set PATH to exclude install directory
+    export PATH="/usr/bin:/bin"
+
+    # Extract and test check_path function
+    local temp_script="$(mktemp)"
+
+    cat > "$temp_script" << EOF
+#!/bin/bash
+INSTALL_DIR="$TEST_INSTALL_DIR"
+
+check_path() {
+    if [[ ":\$PATH:" != *":\$INSTALL_DIR:"* ]]; then
+        echo "WARN: \$INSTALL_DIR is not in your PATH"
+        echo "Add this to your ~/.bashrc:"
+        echo "  export PATH=\"\\\$HOME/.local/bin:\\\$PATH\""
+        return 0
+    else
+        echo "SUCCESS: \$INSTALL_DIR is already in PATH"
+        return 0
+    fi
+}
+
+check_path
+EOF
+    chmod +x "$temp_script"
+
+    run bash "$temp_script"
+
+    # Should warn about PATH
+    [[ "$output" =~ "not in your PATH" ]] || [[ "$output" =~ "WARN" ]]
+
+    rm -f "$temp_script"
+}
+
+@test "install.sh PATH detection succeeds when already in PATH" {
+    # Set PATH to include install directory
+    export PATH="$TEST_INSTALL_DIR:/usr/bin:/bin"
+
+    # Extract and test check_path function
+    local temp_script="$(mktemp)"
+
+    cat > "$temp_script" << EOF
+#!/bin/bash
+INSTALL_DIR="$TEST_INSTALL_DIR"
+
+check_path() {
+    if [[ ":\$PATH:" != *":\$INSTALL_DIR:"* ]]; then
+        echo "WARN: \$INSTALL_DIR is not in your PATH"
+        return 0
+    else
+        echo "SUCCESS: \$INSTALL_DIR is already in PATH"
+        return 0
+    fi
+}
+
+check_path
+EOF
+    chmod +x "$temp_script"
+
+    run bash "$temp_script"
+
+    # Should succeed
+    [[ "$output" =~ "SUCCESS" ]] || [[ "$output" =~ "already in PATH" ]]
+
+    rm -f "$temp_script"
+}
+
+# =============================================================================
+# Test 11-12: Uninstallation Tests
+# =============================================================================
+
+@test "install.sh uninstall removes all files" {
+    # First run installation
+    run run_install install
+    assert_success
+
+    # Verify files exist
+    assert_file_exists "$TEST_INSTALL_DIR/ralph"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-monitor"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-setup"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-import"
+
+    # Run uninstall
+    run run_install uninstall
+    assert_success
+
+    # Verify command files are removed
+    assert_file_not_exists "$TEST_INSTALL_DIR/ralph"
+    assert_file_not_exists "$TEST_INSTALL_DIR/ralph-monitor"
+    assert_file_not_exists "$TEST_INSTALL_DIR/ralph-setup"
+    assert_file_not_exists "$TEST_INSTALL_DIR/ralph-import"
+}
+
+@test "install.sh uninstall cleans up directories" {
+    # First run installation
+    run run_install install
+    assert_success
+
+    # Verify ralph home exists
+    assert_dir_exists "$TEST_RALPH_HOME"
+
+    # Run uninstall
+    run run_install uninstall
+    assert_success
+
+    # Verify ralph home is removed
+    [[ ! -d "$TEST_RALPH_HOME" ]]
+}
+
+# =============================================================================
+# Test 13-14: Idempotency and Integration Tests
+# =============================================================================
+
+@test "installation idempotency (run twice without errors)" {
+    # First installation
+    run run_install install
+    assert_success
+
+    # Capture file counts after first install
+    local ralph_count_1=$(ls "$TEST_INSTALL_DIR" | wc -l)
+    local template_count_1=$(ls "$TEST_RALPH_HOME/templates" | wc -l)
+
+    # Second installation (should overwrite cleanly)
+    run run_install install
+    assert_success
+
+    # Capture file counts after second install
+    local ralph_count_2=$(ls "$TEST_INSTALL_DIR" | wc -l)
+    local template_count_2=$(ls "$TEST_RALPH_HOME/templates" | wc -l)
+
+    # Counts should be the same (no duplicates or missing files)
+    assert_equal "$ralph_count_1" "$ralph_count_2"
+    assert_equal "$template_count_1" "$template_count_2"
+
+    # All files should still exist and be valid
+    assert_file_exists "$TEST_INSTALL_DIR/ralph"
+    assert_file_exists "$TEST_RALPH_HOME/templates/PROMPT.md"
+    assert_file_exists "$TEST_RALPH_HOME/lib/circuit_breaker.sh"
+}
+
+@test "complete installation workflow end-to-end" {
+    # Skip if dependencies missing
+    if ! command -v jq &> /dev/null; then
+        skip "jq not available"
+    fi
+    if ! command -v git &> /dev/null; then
+        skip "git not available"
+    fi
+
+    # Run full installation
+    run run_install install
+    assert_success
+
+    # Verify all directories created
+    assert_dir_exists "$TEST_INSTALL_DIR"
+    assert_dir_exists "$TEST_RALPH_HOME"
+    assert_dir_exists "$TEST_RALPH_HOME/templates"
+    assert_dir_exists "$TEST_RALPH_HOME/lib"
+
+    # Verify all commands installed
+    assert_file_exists "$TEST_INSTALL_DIR/ralph"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-monitor"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-setup"
+    assert_file_exists "$TEST_INSTALL_DIR/ralph-import"
+
+    # Verify all templates copied
+    assert_file_exists "$TEST_RALPH_HOME/templates/PROMPT.md"
+    assert_file_exists "$TEST_RALPH_HOME/templates/fix_plan.md"
+    assert_file_exists "$TEST_RALPH_HOME/templates/AGENT.md"
+
+    # Verify all lib files copied
+    assert_file_exists "$TEST_RALPH_HOME/lib/circuit_breaker.sh"
+    assert_file_exists "$TEST_RALPH_HOME/lib/response_analyzer.sh"
+    assert_file_exists "$TEST_RALPH_HOME/lib/date_utils.sh"
+
+    # Verify all scripts in ralph home
+    assert_file_exists "$TEST_RALPH_HOME/ralph_loop.sh"
+    assert_file_exists "$TEST_RALPH_HOME/ralph_monitor.sh"
+    assert_file_exists "$TEST_RALPH_HOME/setup.sh"
+    assert_file_exists "$TEST_RALPH_HOME/ralph_import.sh"
+
+    # Verify all permissions correct
+    [[ -x "$TEST_INSTALL_DIR/ralph" ]]
+    [[ -x "$TEST_RALPH_HOME/ralph_loop.sh" ]]
+    [[ -x "$TEST_RALPH_HOME/lib/circuit_breaker.sh" ]]
+
+    # Verify output contains success message
+    [[ "$output" =~ "installed" ]] || [[ "$output" =~ "SUCCESS" ]] || [[ "$output" =~ "success" ]]
+}