Expand model tag support: add GLM-5.1, simplify Anthropic IDs, scan tags anywhere in message

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gateway/knowledge/trading/strategies/options/strap.md

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+---
+description: "A bullish volatility strategy buying two ATM calls and one ATM put at strike K, profiting more from an upward move than a downward move of equal magnitude."
+tags: [options, volatility, bullish, strap]
+---
+
+# Strap
+
+**Section**: 2.34 | **Asset Class**: Options | **Type**: Volatility
+
+## Overview
+The strap is a volatility strategy consisting of a long position in two ATM call options and a long position in one ATM put option with strike K. This is a net debit trade. The trader's outlook is bullish (skewed toward upside). This is a capital gain strategy that profits from a large move in either direction but gains more from an upward move.
+
+## Construction
+- Buy 2 ATM call options at strike K
+- Buy 1 ATM put option at strike K, same expiry
+
+Net debit: D
+
+## Payoff Profile
+f_T = 2 × (S_T - K)+ + (K - S_T)+ - D
+
+- Upper breakeven: S*_up = K + D/2
+- Lower breakeven: S*_down = K - D
+- Max profit: P_max = unlimited  (especially strong on upside due to 2 calls)
+- Max loss: L_max = D  (if S_T = K at expiry)
+
+## Key Conditions / Signals
+- Bullish but uncertain of direction; expects a large move with upside bias
+- Low implied volatility environment is ideal (cheaper debit to enter)
+- The upper breakeven (D/2 above K) is closer to K than the lower breakeven (D below K)
+
+## Notes
+The strap is a modified straddle with bullish skew: two calls vs. one put. The upside potential is doubled relative to the downside (per unit of move). Maximum loss is capped at the net debit D.