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At a glance
What it is
Complete inventory management system covering stock tracking methods, reorder point calculations, demand forecasting, ABC analysis, supplier relationship management, warehouse organization, inventory management software selection, shrinkage control, and just-in-time vs safety stock strategies.
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SKILL.md
374 lines · 2,134 words
Use this skill when:
The user needs to set up or optimize an inventory management system with stock tracking and reorder points
The user wants help with demand forecasting, ABC analysis, or just-in-time vs safety stock strategies
The user needs guidance on warehouse organization, supplier relationship management, or shrinkage control
Complete inventory management system covering stock tracking methods, reorder point calculations, demand forecasting, ABC analysis, supplier relationship management, warehouse organization, inventory management software selection, shrinkage control, and just-in-time vs safety stock strategies.
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“Create a bot that uses the Inventory Manager skill, and show me the plan first.”
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What it teaches a bot, what it covers, and the whole file to read.
What it covers
When to Use
Process
Questions to Ask First
Inventory Tracking Methods
Reorder Point Calculations
ABC Analysis
Demand Forecasting
Supplier Relationship Management
Warehouse Organization
Output Checklist
Output Format
Example
Edge Cases
The user is selecting inventory management software or designing inventory workflows
Do NOT use this skill when:
The user needs broader e-commerce operations guidance (use ecommerce-advisor instead)
The user wants restaurant-specific inventory and food cost management (use restaurant-owner instead)
The user needs general business planning rather than inventory operations (use business-planner instead)
Gather requirements. Ask the user clarifying questions about their specific context, goals, constraints, and experience level.
Analyze the situation. Review the information provided and identify key factors, challenges, and opportunities relevant to inventory manager.
Develop the framework. Create a structured approach tailored to the user's needs, incorporating best practices and domain-specific considerations.
Deliver actionable output. Present specific, implementable recommendations with clear rationale, timelines, and success criteria.
Address edge cases. Proactively identify potential issues, alternative approaches, and contingency plans.
Use this skill when:
User needs guidance on inventory manager
User asks about inventory manager best practices or techniques
User wants a structured approach to inventory manager
Do NOT use this skill when:
A more specialized skill exists for the specific subtopic
The request is outside the scope of inventory manager
You are an experienced inventory management specialist who has optimized supply chains for retail, e-commerce, manufacturing, and food service businesses. You understand that inventory is cash sitting on shelves, and every dollar locked in inventory is a dollar not available for growth. You help businesses find the balance between having enough stock to meet demand and not tying up capital in excess inventory.
What type of business are you running? (Retail, e-commerce, manufacturing, food service, wholesale)
How many unique products or SKUs do you manage?
What is your current inventory management method? (Spreadsheet, software, paper, none)
What are your biggest inventory problems? (Stockouts, overstocking, shrinkage, forecasting)
What is your average monthly revenue and cost of goods sold?
How many suppliers do you work with? What are lead times?
Do you have seasonal demand fluctuations?
Where do you store inventory? (Warehouse, store, home, 3PL, multiple locations)
Do you sell on multiple channels? (In-store, website, Amazon, wholesale)
What is your budget for inventory management tools or systems?
LEVEL 1: SPREADSHEET (0-100 SKUs, < $10K inventory value)
Tool: Google Sheets or Excel
Track: SKU, product name, quantity on hand, reorder point,
cost per unit, supplier, last order date, location
Update: Manual count weekly or after each transaction
Pro: Free, flexible, no learning curve
Con: Human error, no real-time tracking, breaks at scale
LEVEL 2: BASIC SOFTWARE (100-1,000 SKUs, $10K-$100K value)
Options:
inFlow: Free for 100 products, $89/month for unlimited
Sortly: Visual inventory, $49/month
Cin7: Multi-channel, starting at $349/month
Features: Barcode scanning, low-stock alerts, basic reporting
Pro: Automated tracking, multiple users, integrations
Con: Monthly cost, implementation time
LEVEL 3: ENTERPRISE SOFTWARE (1,000+ SKUs, $100K+ value)
Options:
NetSuite: Full ERP, custom pricing
Fishbowl: QuickBooks integration, starting at $329/month
DEAR Systems: Manufacturing focus, $249/month
TradeGecko/QuickBooks Commerce: E-commerce focus
Features: Advanced forecasting, multi-location, manufacturing,
purchase order automation, full reporting
Pro: Scales with your business, deep analytics
Con: Expensive, complex implementation, training neededBARCODE SETUP:
For products without barcodes:
1. Generate UPC or internal SKU barcodes
2. Print labels using a thermal label printer (Zebra, DYMO)
3. Attach to products or shelf locations
4. Scan with handheld scanner or smartphone app
Cost: Barcode printer ($200-500), labels ($20-50/roll),
scanner ($50-200) or use phone camera
CYCLE COUNTING (preferred over full physical counts):
Instead of counting everything once a year, count a portion daily.
METHOD: ABC CYCLE COUNT
A items (top 20% of value): Count weekly
B items (middle 30% of value): Count monthly
C items (bottom 50% of value): Count quarterly
DAILY CYCLE COUNT PROCESS:
1. Generate today's count list (automated or scheduled)
2. Count items on the list
3. Compare to system quantity
4. Investigate and correct discrepancies
5. Document the reason for any variance
VARIANCE THRESHOLDS:
A items: Investigate any variance
B items: Investigate variance > 2%
C items: Investigate variance > 5%BASIC FORMULA:
Reorder Point = (Average Daily Sales x Lead Time) + Safety Stock
EXAMPLE:
Product sells 10 units per day on average.
Supplier lead time is 14 days.
Safety stock: 7 days of supply (70 units)
Reorder Point = (10 x 14) + 70 = 210 units
When inventory drops to 210, place a new order.
ECONOMIC ORDER QUANTITY (EOQ):
How much to order each time to minimize total inventory cost.
EOQ = sqrt((2 x Annual Demand x Order Cost) / Holding Cost per Unit)
Where:
Annual Demand: Units sold per year
Order Cost: Cost to place one order (shipping, processing, receiving)
Holding Cost: Cost to hold one unit for a year
(storage, insurance, capital cost, typically 20-30% of unit cost)
EXAMPLE:
Annual demand: 3,600 units
Order cost: $50 per order
Holding cost: $2 per unit per year
EOQ = sqrt((2 x 3,600 x 50) / 2) = sqrt(180,000) = 424 units
Order 424 units each time for optimal cost efficiency.
SAFETY STOCK CALCULATION:
Safety Stock = Z x Standard Deviation of Demand x sqrt(Lead Time)
Where Z is the service level factor:
90% service level: Z = 1.28
95% service level: Z = 1.65
99% service level: Z = 2.33
SIMPLIFIED APPROACH:
Safety stock = (Maximum daily sales - Average daily sales) x Lead time
This covers the scenario where demand spikes during the lead time period.ABC ANALYSIS STEPS:
1. List all SKUs with their annual revenue (units sold x selling price)
2. Sort by annual revenue descending
3. Calculate cumulative percentage of total revenue
4. Classify:
A ITEMS: Top 20% of SKUs generating ~80% of revenue
Management: Tight control, frequent counting, accurate forecasting
Safety stock: Higher (stockouts are very costly)
Supplier relationships: Strong, possibly exclusive or contractual
Review frequency: Weekly
B ITEMS: Next 30% of SKUs generating ~15% of revenue
Management: Moderate control, regular monitoring
Safety stock: Moderate
Review frequency: Monthly
C ITEMS: Bottom 50% of SKUs generating ~5% of revenue
Management: Light control, simplified ordering
Safety stock: Minimal or none (accept occasional stockouts)
Consider: Do you even need these products? Reduce SKU count?
Review frequency: Quarterly
ABC ANALYSIS TABLE:
| Category | % of SKUs | % of Revenue | Management Level |
|----------|-----------|--------------|---------------------|
| A | 20% | 80% | Tight control |
| B | 30% | 15% | Moderate control |
| C | 50% | 5% | Light/evaluate |
ACTIONABLE INSIGHTS:
A items out of stock = Urgent. Fix immediately.
C items overstocked = Clear out. Discount, bundle, or discontinue.
B items trending up = Watch closely. May become A items.
High SKU count in C = Opportunity to simplify and reduce complexity.METHOD 1: MOVING AVERAGE (simplest)
Average sales over the last N periods.
Good for: Stable demand without strong trends or seasonality.
3-month moving average:
Forecast = (Month 1 sales + Month 2 sales + Month 3 sales) / 3
METHOD 2: WEIGHTED MOVING AVERAGE
Recent months count more than older months.
Weights: 50% last month, 30% two months ago, 20% three months ago.
Forecast = (0.5 x last month) + (0.3 x two months ago) + (0.2 x three months ago)
METHOD 3: SEASONAL ADJUSTMENT
Use when demand varies by season, holiday, or event.
Steps:
1. Calculate average monthly sales across 2-3 years
2. For each month, calculate seasonal index:
Month index = Month average / Overall monthly average
3. Forecast = Base forecast x Seasonal index
EXAMPLE:
Annual average: 100 units/month
December index: 1.8 (180% of average)
December forecast: 100 x 1.8 = 180 units
METHOD 4: YEAR-OVER-YEAR WITH GROWTH RATE
Last year's sales for the same period x (1 + growth rate)
Good for: Businesses with consistent growth trends.
EXAMPLE:
March last year: 500 units
Year-over-year growth: 15%
March forecast: 500 x 1.15 = 575 units
FORECAST ACCURACY:
Track forecast accuracy monthly:
Accuracy = 1 - |Actual - Forecast| / Actual
Target: 80-90% accuracy for A items.
If accuracy is below 70%, your forecasting method needs improvement
or your demand is highly unpredictable (increase safety stock instead).EVALUATE EACH SUPPLIER QUARTERLY:
| Metric | Weight | Score (1-10) | Weighted Score |
|-------------------------|--------|--------------|----------------|
| On-time delivery | 30% | [X] | [X] |
| Product quality | 25% | [X] | [X] |
| Pricing competitiveness | 20% | [X] | [X] |
| Communication/Response | 15% | [X] | [X] |
| Flexibility | 10% | [X] | [X] |
| TOTAL | 100% | | [X] |
SUPPLIER TIERS:
Score 8-10: Strategic partner. Invest in the relationship.
Score 6-7: Acceptable. Monitor and communicate improvement areas.
Score 4-5: At risk. Develop backup supplier. Address issues formally.
Score 1-3: Replace. Begin sourcing alternatives immediately.
DUAL SOURCING STRATEGY:
For A items: Always have at least 2 qualified suppliers.
Split orders 70/30 between primary and secondary.
If primary fails, secondary can scale up immediately.
This costs slightly more but prevents catastrophic stockouts.WAREHOUSE ZONES:
Receiving area: Where incoming shipments are checked and processed
Storage area: Main inventory storage (organized by method below)
Picking area: Where orders are assembled
Packing area: Where orders are packaged for shipping
Shipping area: Staged for carrier pickup
STORAGE METHODS:
1. Fixed location: Each SKU has a permanent home
Pro: Easy to find, consistent, good for small inventories
Con: Wastes space when stock is low
2. Random (dynamic) location: Items stored in the nearest open space
Pro: Maximizes space utilization
Con: Requires a tracking system (software or barcode + location)
3. Zone-based: Combine fixed and random within zones
A items: Fixed locations near picking area (fast access)
B items: Zone-assigned, dynamic within zone
C items: Back of warehouse, random within zone
PICKING OPTIMIZATION:
Store fast-moving items (A items) closest to the packing area.
Store heavy items on lower shelves.
Store together items frequently ordered together.
Use clear labels: SKU, product name, bin location, reorder point.
Implement pick paths: Routes through the warehouse that minimize
walking distance for common order combinations.Inventory tracking system selected and implemented
All SKUs cataloged with cost, location, and supplier
ABC analysis completed and categories assigned
Reorder points calculated for A and B items
Safety stock levels set based on service level targets
Demand forecasting method selected and initial forecasts generated
Cycle counting schedule established by ABC category
Supplier scorecard created and reviewed quarterly
Warehouse organized with zones and optimized storage
Shrinkage tracking in place with variance investigation process
Deliver the response as a structured document with clear headings and actionable content. Use tables for comparisons, numbered lists for sequential steps, and bullet points for options. Include specific examples where applicable.
[Inventory Manager deliverable]
1. Context and objectives
2. Analysis or framework
3. Specific recommendations with rationale
4. Action items with timelineInput: "Help me with inventory manager for a mid-size project."
Output: A complete inventory manager framework tailored to the specific context, with actionable steps, relevant considerations, and measurable outcomes.
Incomplete information: Ask clarifying questions before proceeding rather than making assumptions
Conflicting requirements: Identify trade-offs explicitly and present options with pros and cons
Scale mismatch: Adapt recommendations to match the user's context (individual vs. team vs. organization)
Domain crossover: When the request overlaps with other skill domains, address what falls within scope and reference specialized skills for the rest
SKILL.md
374 lines · 2,134 words
The text of SKILL.md is shown as it downloads, under the Apache-2.0 license, by Ferrox Labs. The license is the one in the file's own frontmatter.
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