options-chain-reader

Broker Option Chain Reader

Convert a broker screenshot into a structured legs table the downstream skills (greeks-calculator, options-payoff) can consume.

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Step 1: Identify the Broker

Look for layout / branding:

Broker	Tell
IBKR (TWS)	Beige/grey theme, "Bid", "Ask", "Last", "Vol", "OI", "IV", "Delta" columns, expiry as YYYYMMDD
TastyTrade	Dark theme, large bid/ask boxes, strike in the middle, calls left / puts right
ToS (Schwab)	Dark theme, "ProbITM" column, "Theo Price" column, expiry as e.g. JAN 17 25
Robinhood	Mobile-first, single-side at a time, fewer columns
Webull	Light-or-dark, multi-leg structure builder

If you can't identify the broker confidently, ask the user — don't guess. Misreading column order silently produces wrong P&L.

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Step 2: Extract Legs

For each leg, capture:

Field	Required	Notes
Underlying ticker	yes	Top of screenshot
Type (call/put)	yes	Column header or left/right grouping
Strike	yes	Listed K
Expiry	yes	Normalize to YYYY-MM-DD
Side (buy/sell)	yes	+ / − or BUY/SELL or filled-trade direction
Quantity	yes	Number of contracts
Fill price	yes	The price you paid (or received, for shorts)
Multiplier	usually 100	100 for US equity options
Current bid/ask	optional	If shown, capture for re-pricing
IV	optional	Capture if shown
Greeks (Δ, Γ, Θ, ν)	optional	Capture if shown

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Step 3: Identify the Strategy

Match the leg structure to a known strategy:

Legs	Strategy
1 long call	Long call
1 short call	Naked short call
1 long put	Long put
1 short put	Cash-secured / naked put
1 long, 1 short, same type, same expiry, different strikes	Vertical spread
1 long, 1 short, same type, same strike, different expiries	Calendar
1 long, 1 short, same type, different strike, different expiry	Diagonal
1 long call + 1 long put, same K, same expiry	Long straddle
1 long OTM call + 1 long OTM put	Long strangle
Buy K1 + sell 2×K2 + buy K3, same expiry	Butterfly
Sell put spread + sell call spread, 4 strikes	Iron condor
Stock + short call	Covered call
Stock + long put	Protective put
Asymmetric legs	Custom — list as-is

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Step 4: Sanity Checks

1. Sum of premiums should match the net debit/credit shown on the screenshot (if visible). If off by > 1% per leg, you read at least one fill price wrong. Stop and re-read — don't auto-correct silently.
2. Multiplier: equity options are 100. If the screenshot says "MULT 100" or "x100", confirm. SPX is 100, but futures options vary.
3. Days to expiry: compute from today; if the broker shows a different DTE (rare), use the broker's — it accounts for early closes.

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Step 5: Structured Output

Return:

{
  "underlying": "AAPL",
  "strategy": "iron_condor",
  "as_of": "2026-05-11T15:34:00Z",
  "legs": [
    {"type": "put",  "strike": 170, "expiry": "2026-06-19", "side": "buy",  "qty": 1, "fill": 0.45, "iv": 0.27, "delta": -0.08},
    {"type": "put",  "strike": 175, "expiry": "2026-06-19", "side": "sell", "qty": 1, "fill": 0.85, "iv": 0.26, "delta": -0.15},
    {"type": "call", "strike": 200, "expiry": "2026-06-19", "side": "sell", "qty": 1, "fill": 0.90, "iv": 0.24, "delta":  0.16},
    {"type": "call", "strike": 205, "expiry": "2026-06-19", "side": "buy",  "qty": 1, "fill": 0.50, "iv": 0.25, "delta":  0.09}
  ],
  "net_debit_credit": +0.80,
  "multiplier": 100,
  "max_profit_observed": 80,
  "max_loss_observed": 420
}

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Step 6: Hand Off

After parsing:

• Recommend options-payoff to visualize the P&L curve.
• Recommend greeks-calculator to compute net Greeks.
• If IV looks stale or inconsistent across legs, recommend iv-surface for a fresh fit.

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What This Skill Won't Do

• Decide whether the trade is good. That's strategy-selector or human judgment.
• Submit orders. Read-only.
• Fetch real-time data. Use yfinance-options for that.