Babysitter safety-stock-calculator

Statistical safety stock calculation skill with service level targeting and variability analysis

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/domains/business/supply-chain/skills/safety-stock-calculator" ~/.claude/skills/a5c-ai-babysitter-safety-stock-calculator-ddbc80 && rm -rf "$T"

manifest: library/specializations/domains/business/supply-chain/skills/safety-stock-calculator/SKILL.md

Safety Stock Calculator

Overview

The Safety Stock Calculator provides statistical methods for determining optimal safety stock levels. It analyzes demand and lead time variability, converts service level requirements, and calculates appropriate buffer stocks to meet customer service targets while optimizing working capital.

Capabilities

Demand Variability Analysis: Coefficient of variation, standard deviation
Lead Time Variability Assessment: Supplier reliability analysis
Service Level Conversion: Fill rate, cycle service level conversion
Safety Stock Formula Application: Standard and periodic review methods
Simulation-Based Safety Stock: Monte Carlo methods for complex scenarios
Dynamic Safety Stock Adjustment: Responsive to changing conditions
Safety Stock Reporting: By segment, category, location
Working Capital Impact Analysis: Investment implications

Input Schema

safety_stock_request:
  items: array
    - sku_id: string
      demand_history: array
      lead_time: object
        average: float
        standard_deviation: float
      review_period: integer
      unit_cost: float
  service_level_targets:
    target_type: string           # fill_rate, cycle_service_level
    target_value: float           # e.g., 0.95 for 95%
  calculation_method: string      # standard, periodic_review, simulation
  simulation_iterations: integer  # For Monte Carlo method

Output Schema

safety_stock_output:
  calculations: array
    - sku_id: string
      demand_stats:
        mean: float
        std_dev: float
        cov: float
      lead_time_stats:
        mean: float
        std_dev: float
      safety_stock_units: integer
      safety_stock_days: float
      service_level_achieved: float
      investment_value: float
  summary:
    total_safety_stock_investment: float
    average_days_coverage: float
    service_level_distribution: object
  recommendations: array

Usage

Standard Safety Stock Calculation

Input: Demand history, lead time, 95% service level target
Process: Calculate demand and LT variability, apply formula
Output: Safety stock in units and days of supply

Monte Carlo Simulation

Input: Complex demand patterns, variable lead times
Process: Simulate 10,000 demand-supply scenarios
Output: Simulation-based safety stock with confidence interval

Segmented Safety Stock Policy

Input: ABC/XYZ segmented portfolio
Process: Apply differentiated service levels by segment
Output: Tiered safety stock policy with investment optimization

Integration Points

ERP Systems: Demand history, lead time data
Planning Systems: Forecast data, variability metrics
Statistical Libraries: scipy, numpy, Monte Carlo tools
Tools/Libraries: Statistical libraries, simulation frameworks

Process Dependencies

Safety Stock Calculation and Optimization
Inventory Optimization and Segmentation
Supply Chain Disruption Response

Best Practices

Use adequate history for variability calculation (12+ months)
Account for seasonality in demand variability
Validate lead time data accuracy with suppliers
Review service level targets with commercial teams
Monitor actual vs. target service levels
Adjust for known future events (promotions, supply constraints)