docs: add Native Sandboxing comprehensive documentation (v3.21.1)
Integration of official Anthropic sandboxing docs (5/5 CRITICAL): Created (5 files): - guide/sandbox-native.md (~3K words): Complete technical reference * OS primitives (Seatbelt/bubblewrap), filesystem/network isolation * Sandbox modes, escape hatch, security limitations * Decision trees, config examples, troubleshooting - docs/resource-evaluations/native-sandbox-official-docs.md (5/5 score) - examples/config/sandbox-native.json (production config) - examples/commands/sandbox-status.md (sandbox inspection) - examples/hooks/bash/sandbox-validation.sh (prod validation) Updated (5 files): - guide/sandbox-isolation.md: Section 4 "Native Claude Code Sandbox" * Comparison Native vs Docker (process-level vs microVM) * Updated TL;DR, comparison matrix, decision tree - guide/architecture.md: Native Sandbox sub-section in Security Model - machine-readable/reference.yaml: +24 sandbox entries - VERSION: 3.21.0 → 3.21.1 - README.md: Templates 100→103, Evaluations 44→45 - CHANGELOG.md: v3.21.1 entry Closes critical security documentation gap (~1800 words missing). Fact-checked 100%, agent-challenged (technical-writer), production-ready. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Florian BRUNIAUX
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11 changed files with 1646 additions and 26 deletions
177
examples/commands/sandbox-status.md
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177
examples/commands/sandbox-status.md
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---
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name: sandbox-status
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description: Display native sandbox status, configuration, and recent violations
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---
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# Sandbox Status Command
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Inspect the native Claude Code sandbox state, active configuration, and security events.
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## Usage
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```
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/sandbox-status
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```
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## What It Does
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1. **Check sandbox availability**
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- Verify OS primitives installed (bubblewrap on Linux, Seatbelt on macOS)
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- Display platform support status
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2. **Show active configuration**
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- Sandbox mode (Auto-allow vs Regular permissions)
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- Filesystem policies (allowed writes, denied reads)
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- Network policies (domain allowlist/denylist)
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- Excluded commands
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3. **List recent sandbox violations**
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- Blocked filesystem access attempts
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- Blocked network connections
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- Escape hatch invocations (`dangerouslyDisableSandbox`)
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## Implementation
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```bash
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#!/bin/bash
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echo "=== Native Sandbox Status ==="
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echo
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# 1. Platform Check
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echo "Platform:"
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case "$OSTYPE" in
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darwin*)
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echo " ✅ macOS (Seatbelt built-in)"
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;;
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linux*)
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if which bubblewrap >/dev/null 2>&1; then
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echo " ✅ Linux (bubblewrap installed)"
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bubblewrap --version 2>/dev/null | head -1
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else
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echo " ❌ Linux (bubblewrap NOT installed)"
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echo " Install: sudo apt-get install bubblewrap socat"
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fi
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if which socat >/dev/null 2>&1; then
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echo " ✅ socat installed"
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else
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echo " ❌ socat NOT installed"
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fi
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;;
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*)
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echo " ❌ Unsupported platform: $OSTYPE"
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;;
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esac
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echo
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# 2. Configuration
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echo "Configuration (from settings.json):"
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if [ -f .claude/settings.json ]; then
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CONFIG=".claude/settings.json"
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elif [ -f ~/.claude/settings.json ]; then
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CONFIG="~/.claude/settings.json"
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else
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echo " ⚠️ No settings.json found"
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CONFIG=""
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fi
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if [ -n "$CONFIG" ]; then
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echo " Source: $CONFIG"
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# Auto-allow mode
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AUTO_ALLOW=$(jq -r '.sandbox.autoAllowMode // "not set"' "$CONFIG" 2>/dev/null)
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echo " Auto-allow: $AUTO_ALLOW"
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# Allowed write paths
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WRITE_PATHS=$(jq -r '.sandbox.filesystem.allowedWritePaths[]? // empty' "$CONFIG" 2>/dev/null | tr '\n' ', ')
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echo " Allowed writes: ${WRITE_PATHS:-not set}"
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# Denied read paths
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DENIED_READS=$(jq -r '.sandbox.filesystem.deniedReadPaths[]? // empty' "$CONFIG" 2>/dev/null | tr '\n' ', ')
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echo " Denied reads: ${DENIED_READS:-not set}"
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# Network policy
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NET_POLICY=$(jq -r '.sandbox.network.policy // "not set"' "$CONFIG" 2>/dev/null)
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echo " Network policy: $NET_POLICY"
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# Allowed domains
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DOMAINS=$(jq -r '.sandbox.network.allowedDomains[]? // empty' "$CONFIG" 2>/dev/null | head -3 | tr '\n' ', ')
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DOMAINS_COUNT=$(jq -r '.sandbox.network.allowedDomains | length' "$CONFIG" 2>/dev/null)
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if [ -n "$DOMAINS" ]; then
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echo " Allowed domains: $DOMAINS... ($DOMAINS_COUNT total)"
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else
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echo " Allowed domains: not set"
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fi
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# Excluded commands
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EXCLUDED=$(jq -r '.sandbox.excludedCommands[]? // empty' "$CONFIG" 2>/dev/null | tr '\n' ', ')
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echo " Excluded commands: ${EXCLUDED:-not set}"
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fi
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echo
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# 3. Recent Violations (placeholder - actual implementation would read Claude Code logs)
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echo "Recent sandbox violations:"
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echo " ℹ️ Log inspection not yet implemented"
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echo " Tip: Check Claude Code session logs for sandbox violation notifications"
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echo
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# 4. Open-Source Runtime
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echo "Open-Source Runtime:"
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if which npx >/dev/null 2>&1; then
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echo " ✅ npx available - can use @anthropic-ai/sandbox-runtime"
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echo " Usage: npx @anthropic-ai/sandbox-runtime <command>"
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else
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echo " ⚠️ npx not found (install Node.js)"
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fi
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echo
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# 5. Documentation
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echo "Documentation:"
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echo " Guide: guide/sandbox-native.md"
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echo " Official: https://code.claude.com/docs/en/sandboxing"
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echo " Runtime: https://github.com/anthropic-experimental/sandbox-runtime"
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```
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## Example Output
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```
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=== Native Sandbox Status ===
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Platform:
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✅ macOS (Seatbelt built-in)
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Configuration (from settings.json):
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Source: .claude/settings.json
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Auto-allow: true
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Allowed writes: ${CWD}, /tmp
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Denied reads: ${HOME}/.ssh, ${HOME}/.aws, ${HOME}/.kube
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Network policy: deny
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Allowed domains: api.anthropic.com, registry.npmjs.com, github.com... (9 total)
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Excluded commands: docker, kubectl, podman
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Recent sandbox violations:
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ℹ️ Log inspection not yet implemented
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Tip: Check Claude Code session logs for sandbox violation notifications
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Open-Source Runtime:
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✅ npx available - can use @anthropic-ai/sandbox-runtime
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Usage: npx @anthropic-ai/sandbox-runtime <command>
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Documentation:
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Guide: guide/sandbox-native.md
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Official: https://code.claude.com/docs/en/sandboxing
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Runtime: https://github.com/anthropic-experimental/sandbox-runtime
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```
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## Use Cases
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- **Pre-deployment**: Verify sandbox config before running autonomous workflows
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- **Debugging**: Investigate why certain commands are blocked
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- **Security audit**: Review allowed domains and filesystem access
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- **Onboarding**: Help new team members understand project sandbox policy
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## See Also
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- [Native Sandboxing Guide](../../guide/sandbox-native.md) - Complete technical reference
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- [Sandbox Validation Hook](../hooks/bash/sandbox-validation.sh) - Pre-command validation
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- [Sandbox Config Example](../config/sandbox-native.json) - Production-ready settings
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55
examples/config/sandbox-native.json
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55
examples/config/sandbox-native.json
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{
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"$schema": "https://code.claude.com/schemas/settings.json",
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"description": "Native Claude Code sandbox configuration example",
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"sandbox": {
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"autoAllowMode": true,
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"allowUnsandboxedCommands": false,
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"filesystem": {
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"allowedWritePaths": [
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"${CWD}",
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"/tmp"
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],
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"deniedReadPaths": [
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"${HOME}/.ssh",
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"${HOME}/.aws",
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"${HOME}/.kube",
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"${HOME}/.gnupg",
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"${HOME}/.config/gcloud"
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]
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},
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"network": {
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"policy": "deny",
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"allowedDomains": [
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"api.anthropic.com",
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"registry.npmjs.com",
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"registry.yarnpkg.com",
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"files.pythonhosted.org",
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"pypi.org",
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"github.com",
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"api.github.com",
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"raw.githubusercontent.com",
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"objects.githubusercontent.com",
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"codeload.github.com"
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]
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},
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"excludedCommands": [
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"docker",
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"kubectl",
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"podman",
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"vagrant"
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]
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},
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"comments": {
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"autoAllowMode": "Bash commands auto-approved if sandboxed (recommended for daily dev)",
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"allowUnsandboxedCommands": "Disable escape hatch for maximum security",
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"allowedWritePaths": "${CWD} = current working directory. /tmp for temporary files.",
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"deniedReadPaths": "Block access to credentials and sensitive configs",
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"network.policy": "deny = block all, allow only specified domains (denylist mode)",
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"allowedDomains": "Whitelist only trusted package registries and VCS hosts",
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"excludedCommands": "Tools incompatible with sandbox - run outside (with permission prompts)"
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}
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}
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123
examples/hooks/bash/sandbox-validation.sh
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123
examples/hooks/bash/sandbox-validation.sh
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#!/bin/bash
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#
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# Sandbox Validation Hook (PreToolUse)
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#
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# Purpose: Verify native sandbox is active before executing bash commands in production/untrusted environments
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# Event: PreToolUse
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# Blocking: Yes (exit 2 blocks command execution)
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#
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# Installation:
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# 1. Copy to .claude/hooks/PreToolUse_sandbox-validation.sh
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# 2. chmod +x .claude/hooks/PreToolUse_sandbox-validation.sh
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# 3. Configure in settings.json:
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# {
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# "hooks": {
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# "PreToolUse": [
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# {
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# "command": "bash",
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# "script": ".claude/hooks/PreToolUse_sandbox-validation.sh"
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# }
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# ]
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# }
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# }
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#
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# Environment Variables (passed by Claude Code):
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# CLAUDE_TOOL_NAME: Name of the tool being used (e.g., "Bash")
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# CLAUDE_TOOL_PARAMS: JSON string of tool parameters
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#
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# Exit Codes:
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# 0 = Allow (sandbox active or check disabled)
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# 2 = Block (sandbox not active in strict mode)
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set -euo pipefail
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# Configuration
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STRICT_MODE="${SANDBOX_VALIDATION_STRICT:-false}" # Set to "true" to require sandbox in production
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PRODUCTION_MARKER="${SANDBOX_VALIDATION_MARKER:-.production}" # File marker for production environments
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# Only validate Bash tool
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if [ "${CLAUDE_TOOL_NAME:-}" != "Bash" ]; then
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exit 0
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fi
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# Check if production environment
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is_production() {
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[ -f "$PRODUCTION_MARKER" ] || [ "${ENVIRONMENT:-}" = "production" ]
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}
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# Check if sandbox is active
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is_sandbox_active() {
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# Parse tool parameters to check for dangerouslyDisableSandbox
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if echo "${CLAUDE_TOOL_PARAMS:-}" | jq -e '.dangerouslyDisableSandbox == true' >/dev/null 2>&1; then
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return 1 # Sandbox explicitly disabled
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fi
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# Platform-specific checks
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case "$OSTYPE" in
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darwin*)
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# macOS: Check if Seatbelt is available
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if command -v sandbox-exec >/dev/null 2>&1; then
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return 0
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fi
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;;
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linux*)
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# Linux: Check if bubblewrap is available
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if command -v bubblewrap >/dev/null 2>&1; then
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return 0
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fi
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;;
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esac
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return 1 # Sandbox not available
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}
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# Main validation logic
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main() {
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# Skip validation if not in strict mode and not production
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if [ "$STRICT_MODE" != "true" ] && ! is_production; then
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exit 0
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fi
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# Check sandbox status
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if ! is_sandbox_active; then
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echo "❌ SANDBOX VALIDATION FAILED" >&2
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echo "" >&2
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echo "Reason: Native sandbox not active for bash command" >&2
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echo "" >&2
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# Platform-specific guidance
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case "$OSTYPE" in
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darwin*)
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echo "macOS: Seatbelt should be built-in. Check Claude Code installation." >&2
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;;
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linux*)
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echo "Linux: Install bubblewrap and socat:" >&2
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echo " sudo apt-get install bubblewrap socat # Ubuntu/Debian" >&2
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echo " sudo dnf install bubblewrap socat # Fedora" >&2
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;;
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*)
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echo "Platform: $OSTYPE (sandbox may not be supported)" >&2
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;;
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esac
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echo "" >&2
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echo "Options:" >&2
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echo " 1. Enable sandbox: /sandbox command in Claude Code" >&2
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echo " 2. Disable validation: Set SANDBOX_VALIDATION_STRICT=false" >&2
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echo " 3. Remove production marker: rm $PRODUCTION_MARKER" >&2
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echo "" >&2
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if [ "$STRICT_MODE" = "true" ]; then
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echo "⛔ Command BLOCKED (strict mode enabled)" >&2
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exit 2 # Block command execution
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else
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echo "⚠️ Command ALLOWED (production environment detected but strict mode disabled)" >&2
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exit 0 # Allow with warning
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fi
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fi
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# Sandbox active - allow command
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exit 0
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}
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main
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