Generating Sing-Box Configs

Overview

Generate complete, valid sing-box configs tailored to the user's needs. Always ask 4 mandatory questions before generating anything. Verify with sing-box check. Reference community examples and official docs when available.

Mandatory Upfront Questions

Before generating ANY config, ask ALL 4 questions at once:

1. Focus: 通用方便 (general convenience), 性能 (performance), or 隐私安全 (privacy/security)?
2. Platform: PC/client side or server side? sing-box can build proxy servers too.
3. Clash API: Enable Clash API + web dashboard? (needed for clash meta GUI clients like clash-verge, metacubexd)
4. Version: What sing-box version? (affects available fields and syntax)

Do NOT generate anything until all 4 are answered. If the user is unsure, explain the tradeoffs.

After Questions — Ask About Clashtui Template

Ask: "是否需要生成 clashtui 的 sing-box 模板配置?"

Clashtui templates use ${PPG.<group>} and ${PGG.<name>} placeholders for dynamic outbound expansion. If yes, follow the clashtui template section below.

If unsure about clashtui, see the clashtui project source for reference templates (e.g. src/functions/file/template/testdata/singbox_common_tpl.json).

Config Patterns by Focus

General Convenience (通用方便)

• TUN inbound + mixed inbound (port 7890) for system proxy fallback
• FakeIP DNS for zero-leak domain routing
• auto_route: true, strict_route: true for automatic routing
• domain_resolver on outbounds for transparent resolution
• Clash API enabled for GUI switching
• cache_file with store_fakeip: true

Performance (性能)

• DNS: prefer UDP/TCP upstreams (lower latency than DoH/DoT)
• domain_resolver with strategy set per-outbound to avoid extra resolution hops
• TUN stack: system on Linux/Windows, gvisor on Android
• Multiplex enabled on proxy outbounds (h2mux or smux)
• sniff enabled with caching via sniff_override_destination: false
• Avoid unnecessary rule_set complexity — pin to specific rules
• Skip clash_api if not needed (saves memory)

Privacy/Security (隐私安全)

• DNS: always use DoH (type:https) or DoT (type:tls) upstreams
• independent_cache if on older version (auto in 1.14+)
• Block QUIC/STUN/port 853 to prevent DNS leaks
• action: reject for bittorrent protocol
• No FakeIP if strict DNS audit is needed (use real DNS + geosite rules)
• Separate DNS server tags for proxy/direct resolution
• sniff_override_destination: true for strict domain-based routing

Config Patterns by Platform

PC Client (Windows/Linux/macOS)

{
  "log": { "level": "info", "timestamp": true },
  "dns": {
    "servers": [
      { "tag": "dns-remote", "type": "tls", "server": "8.8.8.8", "detour": "proxy" },
      { "tag": "dns-direct", "type": "https", "server": "dns.alidns.com", "detour": "direct", "domain_resolver": "dns-local" },
      { "tag": "dns-local", "type": "local" },
      { "tag": "dns-fake", "type": "fakeip", "inet4_range": "198.18.0.0/15" }
    ],
    "rules": [
      { "rule_set": "geosite-cn", "server": "dns-direct" },
      { "query_type": ["A", "AAAA"], "server": "dns-fake" },
      { "server": "dns-direct" }
    ],
    "strategy": "prefer_ipv4"
  },
  "inbounds": [
    { "type": "mixed", "tag": "mixed-in", "listen": "127.0.0.1", "listen_port": 7890 },
    { "type": "tun", "tag": "tun-in", "address": ["172.19.0.1/30"],
      "mtu": 9000, "auto_route": true, "strict_route": true,
      "auto_redirect": true, "stack": "system" }
  ],
  "outbounds": [
    { "type": "selector", "tag": "proxy", "outbounds": ["auto", "node1"],
      "default": "auto" },
    { "type": "urltest", "tag": "auto", "outbounds": ["node1"],
      "url": "https://www.gstatic.com/generate_204", "interval": "5m", "tolerance": 50 },
    { "type": "direct", "tag": "direct" }
  ],
  "route": {
    "rule_set": [
      { "type": "remote", "tag": "geoip-cn", "format": "binary",
        "url": "https://github.com/SagerNet/sing-geoip/raw/rule-set/geoip-cn.srs",
        "download_detour": "direct", "update_interval": "7d" },
      { "type": "remote", "tag": "geosite-cn", "format": "binary",
        "url": "https://github.com/SagerNet/sing-geosite/raw/rule-set/geosite-geolocation-cn.srs",
        "download_detour": "direct", "update_interval": "7d" }
    ],
    "rules": [
      { "action": "sniff" },
      { "protocol": "dns", "action": "hijack-dns" },
      { "rule_set": "geosite-cn", "outbound": "direct" },
      { "rule_set": "geoip-cn", "outbound": "direct" },
      { "ip_is_private": true, "outbound": "direct" },
      { "protocol": "bittorrent", "outbound": "direct" }
    ],
    "default_domain_resolver": "dns-direct",
    "auto_detect_interface": true,
    "final": "proxy"
  },
  "experimental": {
    "clash_api": { "external_controller": "127.0.0.1:9090", "external_ui": "dashboard", "secret": "", "default_mode": "Rule" },
    "cache_file": { "enabled": true, "path": "cache.db", "store_fakeip": true }
  }
}

Server Side

Server configs are minimalist — just one protocol inbound + direct outbound:

{
  "log": { "level": "info" },
  "inbounds": [{
    "type": "hysteria2", "tag": "hysteria-in",
    "listen": "::", "listen_port": 443,
    "up_mbps": 100, "down_mbps": 100,
    "tls": { "enabled": true, "server_name": "example.com",
      "acme": { "domain": ["example.com"], "email": "admin@example.com" } },
    "users": [{ "password": "your-password" }]
  }],
  "outbounds": [{ "type": "direct", "tag": "direct" }]
}

Note: For 1.14+, tls.acme → tls.certificate_provider (see migrating-sing-box-configs skill).

Common server protocols from community examples at https://github.com/SagerNet/sing-box-examples: Shadowsocks, Trojan, VMess, VLESS (Vision+REALITY, gRPC, HTTP2), Hysteria2, TUIC, ShadowTLS, Naive.

DNS Strategy Quick Reference

DNS server types (1.12+): local, udp, tcp, tls, https, quic, h3, dhcp, fakeip, hosts.

TUN Stack Choice

TUN addresses: ["172.19.0.1/30"] (IPv4 only), ["172.19.0.1/30", "fdfe:dcba:9876::1/126"] (dual-stack).

Version-Specific Adjustments

After generating, ensure syntax matches the target version. Key differences:

• 1.14+: certificate_providers[], store_dns not store_rdrc, remove independent_cache, DNS rules use evaluate+match_response for GeoIP in DNS
• 1.12+: DNS servers use type+server, domain_resolver not domain_strategy, default_domain_resolver in route
• 1.11+: Route rule action: "sniff"/"hijack-dns"/"reject" instead of legacy inbound fields and special outbounds
• 1.10+: TUN address merged array (not inet4_address/inet6_address)
• 1.8+: rule_set not geoip/geosite in route rules

REQUIRED SUB-SKILL: Use migrating-sing-box-configs skill for detailed migration steps if the version doesn't match.

Clashtui Template Generation

When the user wants a clashtui template, use ${...} placeholders for dynamic outbound expansion:

Template pattern — place these in outbounds:

{ "type": "selector", "tag": "Entry", "outbounds": ["${PGG.Auto}", "${PPG.pvd}"], "default": "Auto-pvd" },
{ "type": "urltest", "tag": "Auto", "expand_group_with": ["${PPG.pvd}"],
  "url": "https://www.gstatic.com/generate_204", "interval": "5m", "tolerance": 50 }

Reference full template from the clashtui project source code (e.g. src/functions/file/template/testdata/singbox_common_tpl.json)

Templates go in sing-box/templates/, proxy-providers in sing-box/template_proxy_providers.

Mandatory Verification

After writing the config, run:

sing-box check -c /path/to/config.json

If sing-box binary is not found, ask the user to provide the path or install it. Never skip verification.

If check fails:

1. Read the error message — sing-box reports the exact deprecated field
2. Fix the reported issue directly
3. Re-run check until it passes

When You Don't Know Something

Ask the user for:

1. sing-box docs repo (local clone or https://github.com/SagerNet/sing-box)
2. Official website https://sing-box.sagernet.org — use WebFetch for current docs
3. Community examples at https://github.com/SagerNet/sing-box-examples for reference configs

Never guess config field names. Look them up in:

• Official site: https://sing-box.sagernet.org/configuration/
• Community examples: https://github.com/SagerNet/sing-box-examples

Common Mistakes

• Generating without asking questions first. The user's needs determine the entire config structure.
• Using deprecated fields. Check the version and apply migrations. domain_strategy, sniff on inbound, address with URI prefixes in DNS, geoip/geosite in route — all deprecated in recent versions.
• Forgetting default_domain_resolver in 1.12+ configs with TUN.
• Wrong TUN stack. gvisor for Android, system for Linux/Windows.
• Missing domain_resolver on remote DNS servers. DoH servers need domain_resolver pointing to a bootstrap DNS server for initial resolution.
• Forgetting experimental.cache_file.enabled: true when using rule_set or clash_api.

Red Flags

• Generating a config before asking the 4 mandatory questions — STOP
• Not running sing-box check after writing — the config is unverified
• Guessing field names instead of looking up docs — ask for docs URLs
• Ignoring version differences — always adapt syntax to the target version