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

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- 151 Trading Strategies knowledge base articles
- Shapes knowledge base article
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gateway/knowledge/trading/strategies/options/covered-put.md

@@ -0,0 +1,32 @@
+---
+description: "A sell-write strategy combining short stock with a short put at strike K, generating income while maintaining a neutral-to-bearish position."
+tags: [options, income, covered, bearish]
+---
+
+# Covered Put
+
+**Section**: 2.3 | **Asset Class**: Options | **Type**: Income
+
+## Overview
+The covered put (a.k.a. "sell-write") strategy amounts to shorting stock and writing a put option with strike K against the short stock position. The trader's outlook is neutral to bearish. It has the same payoff as writing a naked call and allows the trader to generate income by periodically selling OTM put options while maintaining the short stock position.
+
+## Construction
+- Short 1 share of stock at price S0
+- Sell 1 put option at strike K, receiving net credit C
+
+Net position: short stock + short put
+
+## Payoff Profile
+f_T = S0 - S_T - (K - S_T)+ + C = S0 - K - (S_T - K)+ + C
+
+- Breakeven: S* = S0 + C
+- Max profit: P_max = S0 - K + C  (achieved when S_T <= K)
+- Max loss: L_max = unlimited  (stock can rise without bound)
+
+## Key Conditions / Signals
+- Neutral to mildly bearish outlook on the underlying
+- Elevated implied volatility makes collected premium more attractive
+- Suitable for income generation when the trader is comfortable with unlimited upside risk
+
+## Notes
+The covered put strategy is symmetrical to the covered call strategy. The short stock position carries unlimited loss potential if the stock rises; the collected put premium provides only limited cushion.