Extract mathematical formulas (F-*) from requirements - calculations, algorithms, conversions. Enables autogeneration of calculation functions with tests. Use when requirements involve math, dates, percentages, or algorithms.
/plugin marketplace add foolishimp/ai_sdlc_method/plugin install aisdlc-methodology@aisdlcThis skill is limited to using the following tools:
Skill Type: Actuator (Requirements Disambiguation) Purpose: Extract F-* formulas from REQ-* requirements Prerequisites: REQ-* requirement exists
You are extracting formulas (F-*) from requirements.
Formulas are:
Goal: Identify formulas precise enough for code autogeneration.
F-001: Stripe processing fee
- Formula: fee = (amount * 0.029) + 0.30
- Inputs: amount (float)
- Output: fee (float, rounded to 2 decimals)
- Autogenerate: calculate_stripe_fee(amount) -> float
F-010: Token expiry time
- Formula: expiry = issue_time + (60 * 60) seconds
- Inputs: issue_time (datetime)
- Output: expiry (datetime)
- Autogenerate: calculate_token_expiry(issue_time) -> datetime
F-020: Discount amount
- Formula: discount = original_price * discount_percentage
- Inputs: original_price (float), discount_percentage (float 0.0-1.0)
- Output: discount (float, rounded to 2 decimals)
- Autogenerate: calculate_discount(price, percentage) -> float
F-030: Idempotency key
- Formula: key = SHA256(merchant_id + timestamp + amount)
- Inputs: merchant_id (str), timestamp (int), amount (float)
- Output: key (hex string, 64 chars)
- Autogenerate: generate_idempotency_key(...) -> str
Identify formulas by looking for:
[EXTRACT FORMULAS - <REQ-ID>]
Requirement: Payment processing
Formulas Extracted (3):
✓ F-001: Stripe processing fee calculation
✓ F-002: Idempotency key generation
✓ F-003: Transaction timeout calculation
Updated: docs/requirements/payments.md
Added: Formulas section with 3 F-*
✅ Formula Extraction Complete!
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