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mcp-costco

mcp-costco

by markswendsen-code
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Local

update_cart

Modify product quantities or delete items in your Costco shopping cart by specifying item numbers and desired amounts.

Instructions

Update item quantities or remove items from the Costco cart

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": {
      "item_number": "<item_number>",
      "quantity": "<quantity>"
    },
    "name": "update_cart"
  }
}

Input Schema

NameRequiredDescriptionDefault
item_numberYesCostco item number of the product to update
quantityYesNew quantity. Set to 0 to remove the item.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions updating or removing items, implying a mutation operation, but does not disclose critical traits such as authentication requirements, error handling (e.g., if item not in cart), or side effects (e.g., cart total changes). This leaves significant gaps for a mutation tool.

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

Conciseness5/5

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

The description is a single, efficient sentence that front-loads the core functionality ('update item quantities or remove items') and specifies the resource ('Costco cart'). There is no wasted text, and every word contributes to understanding the tool's purpose.

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

Completeness2/5

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

Given the tool's complexity as a mutation operation with no annotations and no output schema, the description is incomplete. It lacks details on behavioral traits (e.g., auth needs, error cases), return values, or interactions with sibling tools. For a cart update tool, this leaves the agent with insufficient context to use it effectively.

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

Parameters3/5

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

The schema description coverage is 100%, with clear descriptions for both parameters (item_number and quantity). The description adds minimal value beyond the schema by implying the action context, but it does not provide additional syntax, format details, or examples. This meets the baseline for high schema coverage.

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 clearly states the specific action ('update item quantities or remove items') and the target resource ('Costco cart'), distinguishing it from siblings like 'add_to_cart' (which adds items) and 'view_cart' (which only reads). It precisely defines the tool's function without being vague or tautological.

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

Usage Guidelines3/5

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

The description implies usage for modifying existing cart items, but it does not explicitly state when to use this tool versus alternatives like 'add_to_cart' (for new items) or 'view_cart' (for checking contents). It provides basic context but lacks explicit guidance on exclusions or prerequisites.

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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