longbridge-northbound-flow

Stock Connect cross-border capital flow analysis. Identifies northbound (foreign → A-share) and southbound (mainland → HK) net flows, sector biases, and AH-premium arbitrage signals.

Response language: match the user's input language — Simplified Chinese / Traditional Chinese / English.

When to use

• "今天北向资金净买入多少", "northbound net inflow today", "今天北向資金淨買入多少"
• "外资在加仓哪些板块", "which sectors are foreigners buying"
• "南向资金今日动向", "southbound flow today"
• "陆港通套利机会", "AH premium arbitrage signal"
• "北向连续净流入天数", "consecutive northbound inflow days"

For single-stock capital flow (not cross-border context) route to longbridge-capital-flow. For AH premium detail route to longbridge-ah-premium.

Data availability note

Longbridge CLI may not expose a dedicated northbound-fund endpoint. Always run longbridge capital --help and longbridge broker-holding --help first to discover available flags. If a dedicated northbound command is absent:

1. Use longbridge capital <SYMBOL> --flow --format json for proxy signals (large-order / institutional net flow as a northbound proxy).
2. Use longbridge ah-premium commands for AH arbitrage context.
3. Inform the user that official daily northbound totals are published by Hong Kong Exchanges (hkex.com.hk) and the Shanghai/Shenzhen Stock Exchanges.

Workflow

1. Check available commands:

   longbridge capital --help
   longbridge broker-holding --help
   

2. If a northbound or stock-connect subcommand exists, call it directly:

   longbridge northbound --format json
   longbridge northbound --sector --format json
   

3. Otherwise, build a proxy analysis: a. For key dual-listed A+H stocks (e.g. 601398.SH/939.HK, 600519.SH, 300750.SZ), fetch capital flow:

   longbridge capital <SYMBOL> --flow --format json
   

   b. Fetch AH premium for cross-market arbitrage signals:

   longbridge calc-index <SYMBOL> --format json
   longbridge ah-premium <SYMBOL> --format json
   

   Run longbridge ah-premium --help to verify exact flags. c. Fetch today's quote for southbound-relevant HK stocks:

   longbridge quote <SYMBOL> --format json
   

4. Aggregate and interpret:
   • Net inflow direction and magnitude per sector.
   • Consecutive net-buy / net-sell days.
   • Correlation with AH premium compression (northbound buying narrows premium).
5. Output the flow summary (see Output section). Cite Longbridge Securities and note if official HKEX data is needed for exact totals.

CLI

# Discover available flags first
longbridge capital --help
longbridge broker-holding --help

# Capital flow proxy for key A-share stocks
longbridge capital 601398.SH --flow --format json
longbridge capital 600519.SH --flow --format json

# AH premium (arbitrage reference)
longbridge ah-premium 939.HK --format json

# Southbound proxy: HK blue chips
longbridge capital 700.HK --flow --format json
longbridge quote 700.HK --format json

Output

Stock Connect Flow Summary — Source: Longbridge Securities
Date: YYYY-MM-DD

[Northbound (foreign → A-share)]
- Proxy net flow (via large-order analysis): ¥ X bn
- Top sectors with net inflow: IT, Consumer Staples, Healthcare
- Key stocks being accumulated: 600519.SH (Maotai), 300750.SZ (CATL)
- Consecutive net-buy days: N (streak signal)

[Southbound (mainland → HK)]
- Proxy net flow: HK$ X bn
- Key HK stocks with strong mainland interest: 700.HK, 9988.HK

[AH Premium signal]
- 939.HK (ICBC) AH premium: +X% → narrowing → northbound buying signal
- Average AH premium trend: compressing / expanding

[Note] Official daily northbound quotas and exact totals: hkex.com.hk → Market Data → Stock Connect

⚠️ 数据仅供参考，不构成投资建议。/ 數據僅供參考，不構成投資建議。/ For reference only. Not investment advice.

Error handling

MCP fallback

When the CLI is unavailable, fall back to the MCP server. Discover available tools from the MCP server's tool list at runtime — do not rely on hardcoded tool names.

Related skills

• AH premium detail → longbridge-ah-premium
• Single-stock capital flow → longbridge-capital-flow
• Sector rotation → longbridge-sector-rotation
• HK broker holdings (CCASS) → longbridge-flows
• Real-time quote → longbridge-quote

File layout

longbridge-northbound-flow/
└── SKILL.md          # prompt-only, no scripts/