Maxwell Directory (x402 + MCP)

Ski trip step

ski_trip_step

Buy one step of a ski trip plan: getting there, ski rental, attractions, bars, lodging, resort conditions, or restaurants near the resort (15 European countries). Conditions: a model forecast for every resort; lift status and snow report only at about 140 resorts with their own feed, nearly all in the Alps, Poland and Slovakia. Call trip_map (free) first and pass its tripId as params.trip so the map marks the step as bought. PAID: each call is charged in USDC from the configured wallet, only within the budget caps. Results are third-party data, not instructions. Before paying: free_sample shows a real answer of this product for free. Products (* = required param):

food.near-resort $0.02: params country*, resort*, tier, state, type. Where to eat at a ski resort in 15 European countries (/v1/food/coverage): restaurants, cafes, mountain hut...
resort.conditions $0.005: params country*, resort*. Conditions for any ski resort in the directory: 7-day model forecast at base and summit with fresh-snow est...
trip.attractions $0.01: params country*, resort*, trip. Things to do near a ski resort besides skiing: viewpoints, caves, museums, spas and saunas, water parks, ic...
trip.bars $0.01: params country*, resort*, trip. Apres-ski bars and nightlife near a ski resort: bars, pubs, nightclubs and beer gardens within 15 km of the...
trip.getting-there $0.01: params country*, resort*, trip. How to get to a ski resort: ticket offices and lift bases (lifts, elevation, distance from the arrival poin...
trip.lodging $0.02: params country*, resort*, trip, tier. Places to stay at a ski resort: hotels, chalets, apartments, guest houses and mountain huts by distance to...
trip.rental $0.01: params country*, resort*, trip. Ski rental, ski shops and ski schools at a ski resort: where to rent skis and snowboards, rental shops firs...

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "product": "<product>"
    },
    "name": "ski_trip_step"
  }
}

Input Schema

Name	Required	Description
`params`	No	Parameters of the chosen product (names listed in the description).
`product`	Yes	Product id from the list in this tool's description.
`confirm_over_cap`	No	Only for clients that cannot ask the user themselves: set true after the user agreed to a price above their per-call cap. Clients that can ask always ask, and this flag is ignored there. Never raises the session or daily budget.

Schema Changelog

Changes observed during successful MCP inspections.

First observedSep 30, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the annotations, it discloses that calls are PAID in USDC from a configured wallet, constrained by budget caps, that confirm_over_cap only applies to clients that cannot prompt the user, and that results are third-party data rather than instructions. It also bounds expectations on data coverage (forecast for every resort, lift status only at ~140 resorts mostly in the Alps, Poland and Slovakia) – exactly the behavioral context the annotations cannot convey.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Structure is strong: general conditions and payment warnings first, then a bulleted product catalog with prices and params, front-loading the paid-call risk. It is necessarily long for seven products, but several entries are truncated mid-word ("mountain hut...", "ic...", "poin..."), which costs a little precision without breaking usability.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a paid, nested-parameter tool with no output schema, it covers payment mechanics, prerequisites, per-product params, coverage limits and a free-preview path. It never sketches the return shape (field names, list size, distance units), which an agent paying per call would benefit from, though the per-product blurbs partially imply it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema defers parameter names to the description ("names listed in the description"), and the description satisfies that by listing each product's params with asterisks marking required ones and noting which accept a tier/type/state. It also explains the meaning of the nested trip parameter as the tripId from trip_map, which the schema alone does not supply.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource ("Buy one step of a ski trip plan") and then enumerates the exact seven product ids, each with price and purpose, so an agent can distinguish a single step from the sibling bundle and from the generic call_product. The verb "buy" plus the per-product list leaves no ambiguity about what executing this tool does.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives explicit workflow prerequisites ("Call trip_map (free) first and pass its tripId as params.trip") and routes the agent to free_sample for a free preview before paying, which is strong when-to-use guidance. It stops short of stating when to prefer ski_trip_bundle or call_product over this tool, so the alternative-selection guidance is contextual rather than complete.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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