Mechanic — Vehicle Maintenance Tracker

Track mileage and service intervals for any combination of vehicles — trucks, cars, motorcycles, RVs, dirt bikes, ATVs, boats, and more. Decodes VINs to auto-populate vehicle specs, researches manufacturer-recommended maintenance schedules, tracks service history, estimates costs, monitors recalls, tracks fuel economy, manages warranties, and proactively reminds about upcoming and overdue services.

Data Storage

All user data lives in /data/mechanic/:

File

Purpose

state.json	All vehicles: current mileage/hours, history, service records, fuel logs, warranties, providers, emergency info
-schedule.json	Per-vehicle service schedule with intervals and cost estimates

Convention: Skill logic lives in /, user data lives in /data/mechanic/. This keeps data safe when the skill is updated or reinstalled.

First-Time Setup

If /data/mechanic/state.json doesn't exist:

Create /data/mechanic/ directory

Ask the user what vehicles they want to track

For each vehicle, run the Adding a New Vehicle workflow (includes choosing check-in frequency per vehicle)

Create state.json with the vehicle entries

Set up the cron job (see Mileage Check Setup)

State File Structure

{
  "settings": {
    "check_in_tz": "America/Phoenix"
  },
  "providers": [
    {
      "id": "jims_diesel",
      "name": "Jim's Diesel Repair",
      "location": "123 Main St, Mesa, AZ",
      "phone": "480-555-1234",
      "specialties": ["diesel", "trucks"],
      "rating": 5,
      "notes": "Great with Power Stroke engines"
    }
  ],
  "vehicles": {
    "f350": {
      "label": "2021 Ford F-350 6.7L Power Stroke",
      "schedule_file": "f350-schedule.json",
      "check_in_frequency": "monthly",
      "current_miles": 61450,
      "last_updated": "2026-01-26",
      "last_check_in": "2026-01-26",
      "vin": "1FT8W3BT0MED12345",
      "vin_data": {
        "decoded": true,
        "decoded_date": "2026-01-26",
        "year": 2021,
        "make": "Ford",
        "model": "F-350",
        "trim": "Lariat",
        "body_class": "Pickup",
        "drive_type": "4WD",
        "engine": "6.7L Power Stroke V8 Turbo Diesel",
        "displacement_l": 6.7,
        "cylinders": 8,
        "fuel_type": "Diesel",
        "transmission": "10-Speed Automatic",
        "doors": 4,
        "gvwr_class": "Class 3",
        "bed_length": "8 ft",
        "wheel_base": "176 in",
        "plant_country": "United States",
        "plant_city": "Louisville",
        "raw_response": {}
      },
      "business_use": false,
      "business_use_percent": 0,
      "mileage_history": [
        {"date": "2026-01-26", "miles": 61450, "source": "user_reported"}
      ],
      "service_history": [
        {
          "service_id": "oil_filter",
          "date": "2025-11-15",
          "miles": 58000,
          "hours": null,
          "notes": "Full synthetic Motorcraft FL-2051S",
          "actual_cost": 125.00,
          "provider": {
            "id": "jims_diesel",
            "name": "Jim's Diesel Repair",
            "parts_warranty_months": 12,
            "labor_warranty_months": 6
          }
        }
      ],
      "fuel_history": [
        {
          "date": "2026-01-20",
          "gallons": 32.5,
          "cost": 108.55,
          "odometer": 61300,
          "mpg": 14.2,
          "notes": "Regular fill-up"
        }
      ],
      "warranties": [
        {
          "type": "factory_powertrain",
          "provider": "Ford",
          "start_date": "2021-03-15",
          "end_date": "2026-03-15",
          "start_miles": 0,
          "end_miles": 60000,
          "coverage_details": "Engine, transmission, drivetrain components",
          "status": "active"
        }
      ],
      "recalls": {
        "last_checked": "2026-01-26",
        "open_recalls": [],
        "completed_recalls": []
      },
      "emergency_info": {
        "vin": "1FT8W3BT0MED12345",
        "insurance_provider": "State Farm",
        "policy_number": "SF-123456789",
        "roadside_assistance_phone": "1-800-555-1234",
        "tire_size_front": "275/70R18",
        "tire_size_rear": "275/70R18",
        "tire_pressure_front_psi": 65,
        "tire_pressure_rear_psi": 80,
        "oil_type": "15W-40 CK-4 Full Synthetic",
        "oil_capacity": "15 quarts",
        "coolant_type": "Motorcraft Orange VC-3DIL-B",
        "def_type": "API certified DEF",
        "tow_rating_lbs": 20000,
        "gvwr_lbs": 14000,
        "gcwr_lbs": 37000,
        "key_fob_battery": "CR2450",
        "fuel_type": "Diesel (Ultra Low Sulfur)",
        "fuel_tank_gallons": 48,
        "notes": ""
      }
    }
  },
  "last_service_review": "2026-01-26"
}

Top-level fields:

• settings — global settings (timezone, etc.)


• providers — reusable list of service providers


• vehicles — keyed by short slug (e.g., f350, rv, crf450)


• last_service_review — date of last full review

Per-vehicle fields:

• label — human-readable vehicle name


• schedule_file — path to the service schedule JSON


• check_in_frequency — how often to ask for mileage (weekly/biweekly/monthly/quarterly)


• current_miles / current_hours — latest known readings


• last_updated / last_check_in — date tracking


• vin — Vehicle Identification Number (for recalls, VIN decode, and emergency info)


• vin_data — decoded VIN data from NHTSA VPIC API (specs, engine, transmission, etc.)


• business_use — whether vehicle is used for business (boolean)


• business_use_percent — percentage of business use (0-100)


• mileage_history — chronological array of mileage/hours entries


• service_history — chronological array of completed services (with optional actual_cost and provider)


• fuel_history — chronological array of fuel fill-ups


• warranties — array of warranty records


• recalls — recall monitoring state (last checked, open/completed)


• emergency_info — quick-reference vehicle specs and emergency contacts

Reading State

On skill load, read:

/data/mechanic/state.json — current state for all vehicles

The relevant -schedule.json file(s) depending on what's being discussed

Adding a New Vehicle

When the user wants to track a new vehicle:

1. Gather Vehicle Info

Ask for the VIN first. If the user provides a VIN, run the VIN Decode (see below) to auto-populate year, make, model, engine, transmission, drive type, and other specs. This saves the user from answering questions you can look up automatically.

Ask for:

• VIN (strongly recommended — auto-populates specs, enables recall monitoring, emergency info)


• Year, make, model (only ask if no VIN provided)


• Engine/trim (only ask if no VIN or VIN decode was incomplete)


• Usage pattern — daily driver, towing, off-road, weekend toy, etc.


• Current mileage/hours


• Business use? — if yes, what percentage? (enables tax deduction tracking)


• Warranty info — any active factory or extended warranties? Expiration date/mileage?


• Emergency info — insurance provider, roadside assistance number, tire sizes (can be filled in later)

If the user doesn't have the VIN handy, proceed with manual info and note that VIN can be added later to unlock auto-population and recall monitoring.

2. Determine Duty Level

Ask about usage to classify the maintenance schedule:

Usage

Duty Level

Effect

Normal commuting	Normal	Standard intervals
Towing, hauling	Severe	Shorter intervals (typically 50-75% of normal)
Off-road, dusty conditions	Severe	Shorter intervals, more frequent filter changes
Extreme temps (hot desert, harsh cold)	Severe	Shorter intervals, fluid/battery concerns
Track/racing	Severe+	Aggressive intervals, specialized fluids
Light use, garage kept	Normal	Standard intervals, but watch time-based items

Most manufacturers publish both "normal" and "severe/special conditions" schedules. Use the one that matches.

3. Choose Check-In Frequency

Ask how often they want to be asked about this vehicle's mileage/hours:

Frequency

Best for

Weekly	Dirt bikes, race vehicles, commercial/fleet, high-mileage daily drivers
Every 2 weeks	Active riders/drivers, vehicles with short service intervals
Monthly	Most cars and trucks (recommended default)
Quarterly	Seasonal vehicles, low-mileage, garage queens, stored boats

Suggest a frequency based on the vehicle type and usage pattern, but let the user override.

4. Research the Service Schedule

Look up manufacturer-recommended maintenance intervals for that specific year/make/model/engine:

• Use web search to find the official maintenance schedule
• Check the owner's manual intervals
• Cross-reference with enthusiast forums for real-world advice
• Factor in the duty level from step 2

5. Build the Schedule File

Create /data/mechanic/-schedule.json:

{
  "vehicle": {
    "year": 2021,
    "make": "Ford",
    "model": "F-350",
    "type": "truck",
    "engine": "6.7L Power Stroke V8 Turbo Diesel",
    "transmission": "10R140 10-Speed Automatic",
    "duty": "severe",
    "notes": "Tows fifth wheel RV"
  },
  "services": [
    {
      "id": "oil_filter",
      "name": "Engine Oil & Filter Change",
      "interval_miles": 7500,
      "interval_months": 6,
      "details": "Specific oil type, filter part number, capacity, and any special instructions.",
      "priority": "critical",
      "cost_diy": "$XX-XX",
      "cost_shop": "$XX-XX",
      "cost_dealer": "$XX-XX",
      "cost_note": "Optional note about related expensive repairs"
    }
  ]
}

Required for every service item:

• id — unique snake_case identifier


• name — human-readable name


• At least one interval: interval_miles, interval_months, interval_hours, or interval_rides


• details — specific parts, fluids, capacities, and any warnings


• priority — critical, high, medium, or low


• cost_diy, cost_shop, cost_dealer — estimated cost ranges

Research costs:

• Search for typical costs for each service on that specific vehicle


• DIY = parts cost only


• Shop = independent mechanic


• Dealer = manufacturer dealership


• Add cost_note for items where failure/repair is significantly more expensive than maintenance

6. Add to State

Add the vehicle to state.json under the vehicles object:

{
  "<key>": {
    "label": "2021 Ford F-350 6.7L Power Stroke",
    "schedule_file": "<key>-schedule.json",
    "check_in_frequency": "monthly",
    "current_miles": 61450,
    "current_hours": null,
    "last_updated": "2026-01-26",
    "last_check_in": "2026-01-26",
    "vin": null,
    "vin_data": {
      "decoded": false
    },
    "business_use": false,
    "business_use_percent": 0,
    "mileage_history": [
      {"date": "2026-01-26", "miles": 61450, "source": "user_reported"}
    ],
    "service_history": [],
    "fuel_history": [],
    "warranties": [],
    "recalls": {
      "last_checked": null,
      "open_recalls": [],
      "completed_recalls": []
    },
    "emergency_info": {
      "vin": null,
      "insurance_provider": null,
      "policy_number": null,
      "roadside_assistance_phone": null,
      "tire_size_front": null,
      "tire_size_rear": null,
      "tire_pressure_front_psi": null,
      "tire_pressure_rear_psi": null,
      "oil_type": null,
      "oil_capacity": null,
      "coolant_type": null,
      "tow_rating_lbs": null,
      "gvwr_lbs": null,
      "key_fob_battery": null,
      "fuel_type": null,
      "fuel_tank_gallons": null,
      "notes": ""
    }
  }
}

Key naming: Use a short, memorable slug — f350, civic, r1, rv, crf450, harley, bass_boat, etc.

7. Update Cron Job

Update the cron job prompt to include the new vehicle. If this vehicle's frequency is higher than the current cron schedule, update the cron to fire at the higher frequency.

8. VIN Decode & Auto-Populate

If a VIN was provided, run the VIN Decode to auto-populate vehicle specs, emergency info fields, and the schedule file's vehicle section. Present the decoded info to the user for confirmation.

9. Run Initial Recall Check

If a VIN was provided, immediately check for open recalls (see NHTSA Recall Monitoring). If no VIN, check by make/model/year.

Vehicle Types and Special Considerations

Type

Track

Key Maintenance Items

Car	Miles	Oil, filters, brakes, tires, transmission, coolant
Truck	Miles	Same as car + diff fluids, transfer case (4WD), heavier brake wear if towing
Motorcycle	Miles	Oil, chain/sprockets, valve clearance, fork oil, brake fluid, coolant (liquid-cooled), tires (wear faster)
Dirt Bike	Hours + rides	Air filter (every ride!), oil (very frequent), valve clearance, suspension service, chain, coolant
ATV/UTV	Hours + miles	Similar to dirt bike + CV boots, belt (CVT), winch maintenance
RV/Trailer	Miles + months	Roof/sealant inspection, slide-outs, wheel bearings, electric brakes, tires (age-based), water system, generator, winterization
Boat	Hours	Oil, impeller, lower unit fluid, zincs/anodes, winterization, trailer bearings
Fifth Wheel/Trailer	Miles + months	No engine, but: bearings, brakes, tires, roof, seals, slides, plumbing, LP gas, seasonal prep

Interval Types

Services can use any combination of:

• interval_miles — odometer-based
• interval_hours — engine/usage hours (generators, dirt bikes, boats)
• interval_months — time-based (everything degrades with age)
• interval_rides — per-use (e.g., dirt bike air filter = every ride)

Whichever interval is reached first triggers the service.

---

VIN Decode & Auto-Population

When a user provides a VIN (during vehicle setup or later), decode it using the free NHTSA VPIC API to automatically look up and store vehicle specifications.

NHTSA VPIC API (VIN Decoder)

Endpoint: No API key required. Free and unlimited. **Example:** __CODE_BLOCK_3__ ### Key Fields to Extract The API returns a Results array with one object containing ~140+ fields. Extract and map these: | VPIC Field | Maps To | Notes | |------------|---------|-------| | ModelYear | vin_data.year | Vehicle year | | Make | vin_data.make | Manufacturer | | Model | vin_data.model | Model name | | Trim | vin_data.trim | Trim level (Lariat, XLT, etc.) | | BodyClass | vin_data.body_class | Pickup, SUV, Motorcycle, etc. | | DriveType | vin_data.drive_type | 4WD, AWD, RWD, FWD | | DisplacementL | vin_data.displacement_l | Engine displacement in liters | | EngineCylinders | vin_data.cylinders | Number of cylinders | | FuelTypePrimary | vin_data.fuel_type | Gasoline, Diesel, Electric, etc. | | EngineModel | vin_data.engine | Combine with displacement for label | | TransmissionStyle | vin_data.transmission | Automatic, Manual, CVT | | TransmissionSpeeds | (append to transmission) | "10-Speed Automatic" | | Doors | vin_data.doors | Number of doors | | GVWR | vin_data.gvwr_class | Gross Vehicle Weight Rating class | | WheelBaseShort | vin_data.wheel_base | Wheelbase in inches | | BedLengthIN | vin_data.bed_length | Truck bed length (if applicable) | | PlantCountry | vin_data.plant_country | Assembly country | | PlantCity | vin_data.plant_city | Assembly city | **Note:** Many fields return empty strings "" if not applicable. Only store non-empty values. ### VIN Data Storage Store decoded data in the vehicle's vin_data object in state.json: __CODE_BLOCK_4__ Store raw_response as the full VPIC result object for reference — it contains additional fields that may be useful later (e.g., AirBagLocFront, SeatBeltsAll, TPMS, ActiveSafetySysNote, etc.). If vin_data.decoded is false or missing, the VIN hasn't been decoded yet. ### Auto-Population Workflow When a VIN is decoded: 1. **Update vin_data** — store all decoded fields 2. **Update label** — build from decoded year/make/model/engine (e.g., "2021 Ford F-350 6.7L Power Stroke") 3. **Update emergency_info** — auto-fill fields that can be derived: - fuel_type from FuelTypePrimary - gvwr_lbs from GVWR (parse weight class to approximate lbs) 4. **Update schedule file** — populate the vehicle section with decoded specs 5. **Present to user** — show what was decoded, confirm accuracy, ask about anything the VIN couldn't tell us (usage pattern, duty level, insurance, etc.) ### When to Decode | Trigger | Action | |---------|--------| | New vehicle added with VIN | Decode immediately, auto-populate | | User provides VIN for existing vehicle | Decode, backfill vin_data and any empty fields | | User says "look up my VIN" | Decode and display specs | | User changes/corrects VIN | Re-decode and update | ### Adding VIN Later If a vehicle was added without a VIN and the user provides one later: 1. Decode the VIN 2. Store in vin_data 3. Update vin field 4. Backfill any empty emergency_info fields 5. Update label if the decoded info is more specific 6. Run an immediate recall check with the new VIN 7. Confirm what was updated ### VIN Decode Presentation Format When presenting decoded VIN data to the user: __CODE_BLOCK_5__ ### Limitations - **VPIC is NHTSA data** — best for US-market vehicles. Import/foreign-market VINs may have incomplete data. - **Trailers and RVs** — VIN decode may return limited data for trailers, fifth wheels, and RVs since they're built by different manufacturers with varying VIN encoding. - **Motorcycles and powersports** — coverage varies. Japanese brands (Honda, Yamaha, Kawasaki, Suzuki) generally decode well. Smaller manufacturers may not. - **Pre-1981 vehicles** — VINs weren't standardized until 1981. Older VINs won't decode. - If decode returns sparse data, fall back to manual entry and web search for specs. --- ## NHTSA Recall Monitoring Monitor for open recalls on all tracked vehicles using the free NHTSA API (no API key required). ### API Endpoints - **By make/model/year:**

• By VIN (more precise): If a VIN is stored, prefer the VIN-based lookup. Otherwise fall back to make/model/year. ### Recall Data Storage Per vehicle in state.json: __CODE_BLOCK_6__ ### When to Check - **Monthly cron:** Include recall checks in the mileage check cron. Check recalls for all vehicles monthly regardless of their check-in frequency. - **On vehicle add:** Check immediately when a new vehicle is added. - **On demand:** User asks "any recalls on my truck?" ### Recall Report Format Include in service review output: __CODE_BLOCK_7__ When a user reports completing a recall, move it from open_recalls to completed_recalls with the completion date. --- ## Fuel / MPG Tracking Track fuel fill-ups to monitor fuel economy, detect mechanical issues early, and track fuel spending. ### Logging a Fill-Up When user says "filled up", "got gas/diesel", or reports a fill-up: 1. Capture: **date**, **gallons**, **cost** (total or price per gallon), **odometer reading** 2. Calculate MPG: (current_odometer - previous_odometer) / gallons 3. Append to the vehicle's fuel_history array 4. Check for MPG anomalies ### Fuel History Entry __CODE_BLOCK_8__ ### MPG Calculations - **Per fill-up MPG:** (current_odometer - previous_fill_odometer) / gallons (skip if previous fill was partial) - **Rolling average:** Average of last 10 fill-ups (or all if fewer than 10) - **Trend:** Compare last 3 fill-ups to rolling average ### Anomaly Detection If a fill-up MPG is **more than 15% below the rolling average**, flag it: __CODE_BLOCK_9__ ### Fuel Report Format When asked "how's my fuel economy?" or "MPG report": __CODE_BLOCK_10__ ### Partial Fills If the user didn't fill up completely, mark partial_fill: true. Skip that entry for MPG calculation (the math won't be accurate), but still track cost and gallons. --- ## Actual Cost Tracking Track what the user actually pays for maintenance to build accurate spending records. ### Capturing Costs When a user logs a completed service: 1. After confirming the service details, ask: **"What did you end up paying?"** (or accept if they volunteered it) 2. Store as actual_cost in the service_history entry 3. If they don't know or don't want to share, leave it null — don't block the log ### Service History Entry (with cost) __CODE_BLOCK_11__ cost_type values: diy, shop, dealer, warranty, recall (free) ### Spending Analysis Track and report on request: - **Per vehicle, per year:** "You've spent $X on the F-350 this year" - **Actual vs estimated:** Compare actual_cost to the schedule's cost estimates - **Category breakdown:** Group by service type (oil changes, filters, tires, etc.) - **All-time total:** Total maintenance spending per vehicle ### Annual Summary When asked or at year-end: __CODE_BLOCK_12__ --- ## Warranty Tracking Track warranties to know what's covered and get alerts before they expire. ### Warranty Entry Structure __CODE_BLOCK_13__ ### Warranty Types | Type | Typical Coverage | |------|-----------------| | factory_bumper_to_bumper | Everything except wear items, shortest duration | | factory_powertrain | Engine, transmission, drivetrain — longer duration | | factory_corrosion | Body rust-through — usually 5+ years | | factory_emissions | Emissions components — federally mandated 8yr/80k for major components | | extended | Third-party or manufacturer extended warranty | | parts_warranty | Specific parts from a shop/dealer (e.g., "new alternator, 2yr warranty") | | labor_warranty | Shop's labor guarantee on a specific repair | ### Expiration Alerts Check warranties during every service review. Alert when: - **Within 3 months** of end_date, OR - **Within 3,000 miles** of end_miles (whichever comes first) Alert format: __CODE_BLOCK_14__ ### Warranty Coverage Check When user asks "is this covered under warranty?" or when flagging a due service: 1. Check all active warranties for the vehicle 2. Match the service type to warranty coverage 3. If potentially covered: "This may be covered under your [warranty type] from [provider] (expires [date]). Contact them before paying out of pocket." ### Status Values - active — currently in effect - expiring_soon — within alert threshold - expired — past end date or end miles - claimed — warranty claim was filed --- ## Pre-Trip / Seasonal Checklists Generate vehicle-specific checklists when a trip or seasonal change is mentioned. ### Trigger Phrases Activate when user says things like: - "I'm heading on a trip" / "road trip" / "going to [location]" - "towing this weekend" / "pulling the RV to [place]" - "getting ready for winter" / "time to winterize" - "spring is coming" / "time to de-winterize" - "going off-road this weekend" / "trail ride" ### Checklist Generation Build the checklist by combining: 1. **Overdue/due-soon services** — Pull from service review for this vehicle 2. **Weather at destination** — Check forecast if location given (hot, cold, rain, snow, altitude) 3. **Trip-type items** — Based on what they're doing 4. **Seasonal items** — Based on current date and location ### Towing Checklist (Truck + Trailer/RV) __CODE_BLOCK_15__ ### Seasonal Checklists **Pre-Winter / Winterization:** - Antifreeze protection level (test with hydrometer) - Battery load test (cold reduces capacity 30-50%) - Wiper blades and washer fluid (cold-rated) - Tire condition (all-season or winter tires?) - Block heater working (diesel trucks) - RV: Full winterization procedure (blow out lines, RV antifreeze, water heater drain, bypass) - Boat: Winterize engine, fog cylinders, stabilize fuel, drain water systems **Pre-Summer / De-Winterization:** - AC system check (run it before you need it) - Coolant level and condition - RV: De-winterize water system, sanitize tanks, check AC units - Check tire pressures (heat increases pressure) - Inspect belts and hoses (heat accelerates wear) **Pre-Trip (General):** - All fluid levels - Tire pressures and condition - Lights and signals - Brakes (visual or recent service) - Wiper blades - Emergency kit (jumper cables, flashlight, first aid) - Registration and insurance current --- ## Mileage Projection Calculate driving pace and project when future services will come due. ### Calculation Requires **2+ data points** in mileage_history at least 14 days apart. __CODE_BLOCK_16__ Use the full history for a stable average, but weight recent data more heavily if there's a significant change in driving pattern. ### Service Date Projection For each service: 1. Calculate miles remaining: next_due_miles - current_miles 2. Project months: miles_remaining / average_miles_per_month 3. Project date: today + projected_months 4. Also check time-based interval independently Include in service review: __CODE_BLOCK_17__ ### Budget Projection When asked or included in reviews: __CODE_BLOCK_18__ ### Insufficient Data If fewer than 2 data points or readings are too close together: - Note: "Need more mileage history to project dates — will be available after next check-in" - Still show mile-based estimates without dates --- ## Service Provider Tracking Track where services are performed for easy reference and provider management. ### Capturing Provider Info When logging a completed service, optionally ask: - **Shop name** (or "same as last time" / "DIY") - **Location** (city/address) - **Phone number** - **Satisfaction rating** (1-5) - **Parts warranty** (months) - **Labor warranty** (months) Don't make this burdensome — if they just say "got my oil changed", log the service first, then casually ask where. Skip if they seem uninterested. ### Provider Storage Providers are stored in two places: 1. **Global providers array** in state.json root — reusable across vehicles: __CODE_BLOCK_19__ 2. **Per service_history entry** — reference by id plus any service-specific warranty: __CODE_BLOCK_20__ ### Provider Queries Handle questions like: - "Where did I get my last oil change?" → Search service_history for most recent oil_filter entry, return provider - "What shop did I use for the transmission service?" → Search by service_id - "Show me all services at Jim's" → Filter service_history by provider.id - "What's Jim's phone number?" → Look up in providers array - "Same shop as last time" → Use the provider from the most recent service_history entry --- ## Tax Deduction Integration For vehicles flagged as business-use, help track deductible maintenance expenses. ### Configuration Per vehicle in state.json: __CODE_BLOCK_21__ If business_use is true and no percentage is set, assume 100%. ### Deduction Tracking When a service is completed with an actual_cost on a business-use vehicle: 1. Calculate deductible portion: actual_cost × (business_use_percent / 100) 2. Note it to the user: __CODE_BLOCK_22__ 3. Suggest logging to the tax-professional skill: __CODE_BLOCK_23__ ### Integration with Tax-Professional Skill If the user confirms, reference skills/tax-professional/SKILL.md and log to data/tax-professional/YYYY-expenses.json: __CODE_BLOCK_24__ ### Annual Tax Summary On request or at tax time: __CODE_BLOCK_25__ --- ## Emergency Info Card Store and quickly retrieve critical vehicle information for roadside emergencies, parts lookup, or quick reference. ### Emergency Info Structure Per vehicle in state.json: __CODE_BLOCK_26__ ### Quick Access Queries Respond instantly to: - "What's my VIN?" → Return VIN - "What are my truck's tire specs?" → Tire sizes and pressures - "What oil does my truck take?" → Oil type and capacity - "Insurance info?" → Provider, policy number, phone - "Roadside assistance number?" → Phone number - "What's my tow rating?" → Tow rating, GVWR, GCWR - "Key fob battery?" → Battery type - "Lug nut torque?" → Torque spec ### Emergency Card Format When asked for "emergency info" or "vehicle card": __CODE_BLOCK_27__ ### Population When adding a new vehicle, collect what's available. Many specs can be researched from the year/make/model. Let the user fill in personal info (insurance, roadside number) over time. Fields can be null until populated. --- ## Cost Per Mile Analysis Calculate total cost of vehicle ownership on a per-mile basis. ### Calculations Requires mileage history with at least 2 data points. __CODE_BLOCK_28__ ### Report Format When asked "cost per mile" or "operating cost": __CODE_BLOCK_29__ ### Fleet Overview If tracking multiple vehicles, show a comparison: __CODE_BLOCK_30__ ### Notes - Only include services with actual_cost recorded (skip nulls) - If no fuel data, show maintenance-only - Warn if data period is short (<3 months or <1,000 miles): "Limited data — will become more accurate over time" - Cost per mile naturally decreases as expensive one-time services are amortized over more miles --- ## Mileage Check (Cron-Triggered) A single cron job runs **weekly** (the highest possible frequency) and checks which vehicles are due for a check-in based on their individual check_in_frequency and last_check_in date. It also performs monthly recall checks. > Prompt: "Mechanic skill: mileage check" When this fires: 1. Read /data/mechanic/state.json 2. For each vehicle, check if it's due for a check-in: - Compare last_check_in date against check_in_frequency - **Weekly**: due if 7+ days since last check-in - **Biweekly**: due if 14+ days - **Monthly**: due if 30+ days - **Quarterly**: due if 90+ days 3. **Monthly recall check**: If 30+ days since any vehicle's recalls.last_checked, fetch latest recalls from NHTSA API and update state 4. If **no vehicles are due for check-in AND no new recalls found**, reply with HEARTBEAT_OK (skip silently) 5. If vehicles are due, ask for current readings on **only the due vehicles** 6. If new recalls found, include them in the message even if no vehicles are due for mileage check-in 7. Update state and last_check_in when they respond 8. Run a **Service Review** for the updated vehicles (includes warranty alerts, projections, recalls) ### Mileage Check Setup Create a single cron job that runs **weekly**. It will internally filter which vehicles are due. Check /USER.md for timezone. **Cron expression:** 0 17 0 (every Sunday at 5pm in user's timezone) **Cron job config:** - **Session:** isolated with delivery to their chat channel - **Prompt:** Read the mechanic skill, load state from data/mechanic/state.json. Check each vehicle's check_in_frequency and last_check_in to determine which are due. Also check recalls if 30+ days since last recall check. If none are due and no new recalls, reply HEARTBEAT_OK. Otherwise, ask for current readings on the due vehicles only, report any new recalls, then run a service review with costs, warranty alerts, and projections. Be conversational. ### Changing Frequency The user can change frequency per vehicle at any time: - "Check my dirt bike weekly" → update that vehicle's check_in_frequency - "Ask about the truck less often" → switch to quarterly - "Change all vehicles to monthly" → update all Update the vehicle's check_in_frequency in state.json and confirm the change. ## Mileage/Hours Update When the user reports mileage or hours (in any context, not just monthly): 1. Update the vehicle's current_miles and/or current_hours 2. Set last_updated to today 3. Append to mileage_history: __CODE_BLOCK_31__ 4. Run a **Service Review** ## Service Review After any mileage/hours update, analyze all services from the vehicle's schedule file. ### For each service item: 1. Find the **last time this service was done** from service_history (match by service_id) 2. If never done, assume done at **mile 0 / hour 0** (vehicle acquisition) 3. Calculate against all applicable intervals: - miles_since_service vs interval_miles - months_since_service vs interval_months - hours_since_service vs interval_hours 4. Categorize: - **🔴 OVERDUE**: Exceeded ANY interval - **🟡 DUE SOON**: Within 15% of ANY interval - **🟢 OK**: Not yet due ### Report Format **Full report (when issues found):** __CODE_BLOCK_32__ **All clear (brief):** __CODE_BLOCK_33__ **When multiple services are due at once**, provide a bundled total estimate and suggest combining them in one shop visit. ### Conditional Sections Only include sections that have relevant data: - Skip recalls section if no open recalls - Skip warranty alerts if none expiring soon - Skip fuel economy if no fuel_history data - Skip projections if insufficient mileage data - Skip spending if no actual_cost data - Skip tax note if vehicle isn't business-use ## Logging Completed Services When the user says they've done a service (e.g., "just got my oil changed", "did the fuel filters at 65k"): 1. Identify which vehicle and which service 2. Ask what they paid (casually — "What'd that run you?" / "How much was it?") 3. Optionally capture provider ("Where'd you take it?" / "Same shop as last time?") 4. Add to that vehicle's service_history: __CODE_BLOCK_34__ 5. If business-use vehicle, note the deductible portion 6. Offer to log to tax-professional if applicable 7. Confirm what was logged 8. Recalculate next due date for that service ## Ad-Hoc Queries Handle questions about any tracked vehicle. If ambiguous, ask which vehicle. **Examples:** - "When's my next oil change?" → Check the relevant vehicle(s) - "What oil does my truck take?" → Reference schedule details or emergency_info - "What maintenance do I need?" → Full review, all vehicles - "I just hit 70,000 miles" → Update mileage, run review - "Got new tires at 61k" → Log service, track rotation from there - "I just got a new [vehicle]" → Walk through adding it - "How much would an oil change cost?" → Reference cost estimates - "What's the most urgent thing?" → Prioritize across all vehicles - "Any recalls on my truck?" → Check NHTSA API - "How's my fuel economy?" → MPG report - "How much have I spent this year?" → Spending summary - "Is my warranty still good?" → Check warranty status - "Is this covered under warranty?" → Match service to active warranties - "I'm heading on a road trip" → Pre-trip checklist - "When will my trans fluid be due?" → Mileage projection - "Where did I get my last oil change?" → Provider lookup - "What's my VIN?" → Emergency info - "Look up my VIN" / "Decode my VIN" → Run VIN decode, show specs - "Here's my VIN: [VIN]" → Decode, store, auto-populate, run recall check - "What are my tire specs?" → Emergency info - "Cost per mile?" → Operating cost analysis - "How much will I spend on maintenance in the next 6 months?" → Budget projection ## Environmental Awareness Check /USER.md for the user's location and use it to tailor advice: **Hot climates (desert, southern states):** - Battery life shortened significantly by heat - Tire UV damage — recommend tire covers for parked vehicles - Coolant system more stressed - Rubber components (belts, hoses, seals) degrade faster - Mud daubers/wasps in vents and exhaust (RVs especially) **Cold climates (northern states, mountains):** - Winterization critical for RVs and boats - Battery capacity reduced in cold - Check antifreeze protection level - Furnace/heating system inspection before cold season **Dusty/off-road environments:** - Engine and cabin air filters need more frequent inspection - Generator air filters (RVs) - Check CV boots (ATVs/UTVs) **Coastal/marine environments:** - Corrosion concerns - More frequent undercarriage wash - Check electrical connections ## Cost Estimates **Always include cost estimates** when flagging overdue or due-soon services: - **DIY** — parts cost only - **Shop** — independent mechanic / specialty shop - **Dealer** — manufacturer dealership Include any cost_note` warnings about expensive failure scenarios.

When presenting a batch of services, provide a total estimate for bundling them in one shop visit.

Important General Notes

• Transmission flushes — Many modern transmissions (especially Ford 10R series, CVTs) should ONLY be drain-and-fill, never flushed. Always check manufacturer recommendation.
• RV roofs — Water intrusion is the #1 RV killer. Always emphasize sealant and roof inspections.
• Tire age — Tires should be replaced at 5-6 years regardless of tread depth, especially RV/trailer tires.
• Severe duty — If someone tows, hauls, drives off-road, or operates in extreme temps, they're almost always on the severe/special conditions schedule whether they realize it or not.
• Part numbers — Include OEM part numbers in schedule details. Users can then find equivalent aftermarket parts.
• Seasonal items — Flag winterization, de-winterization, and seasonal prep based on the user's location and time of year.
• Generator hours — Track separately from vehicle miles. Generators have their own service intervals.
• Breakaway batteries (trailers) — Often forgotten. Include in trailer/RV inspections.
• Recall completions — Always free at the dealer. Never pay for a recall repair.
• Warranty work — Document everything. Keep receipts. Note warranty claim numbers in service history.
• Fuel tracking consistency — Always fill to the same level (full) for accurate MPG calculations. Mark partial fills.