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musaceylan

PriceAtlas MCP Server

by musaceylan

list_stores

Retrieve available supermarket chains for price tracking and comparison. Filter by country code to focus on specific markets.

Instructions

List available stores. Optionally filter by country.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
countryNo2-letter country code to filter stores

Implementation Reference

  • The 'list_stores' tool is registered and implemented directly in src/index.ts using the 'server.tool' method. The handler makes a GET request to '/api/stores' (with an optional country parameter) and returns the JSON result as text.
    server.tool(
      'list_stores',
      'List available stores. Optionally filter by country.',
      {
        country: z.string().length(2).optional().describe('2-letter country code to filter stores'),
      },
      async ({ country }) => {
        try {
          let path = '/api/stores';
          if (country) path += `?country=${country}`;
          const stores = await api(path);
          return text(stores);
        } catch (e) {
          return errorResult(`List stores failed: ${(e as Error).message}`);
        }
      },
    );
Behavior2/5

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

With no annotations provided, the description carries full burden of behavioral disclosure but fails to mention safety guarantees (though implied by 'List'), pagination, return format, or what 'available' signifies.

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?

Two efficient, front-loaded sentences with no waste. Appropriately concise for the tool's simplicity, though bordering on underspecified.

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

Completeness3/5

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

Adequate for the low complexity (1 optional param), but gaps remain regarding the return value structure and store availability criteria, especially since no output schema exists to compensate.

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?

Schema coverage is 100% with the country parameter fully documented. The description adds minimal semantic value beyond the schema, merely confirming the filter is optional.

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

Purpose4/5

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

Clearly states the verb (List) and resource (stores) with scope (available), but lacks differentiation from sibling tools like list_countries or search_products.

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?

Provides implied usage by noting the filter is optional, indicating the tool can be called with no parameters to list all stores. However, lacks explicit when-to-use guidance or comparisons to alternatives.

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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