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mattcoatsworth

ShipStation API MCP Server

list_carriers

Retrieve available shipping carriers from ShipStation to configure shipping options and rates for orders.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • The MCP tool handler function for 'list_carriers'. It calls shipStationClient.getCarriers(), stringifies the result as JSON, and returns it in the expected MCP format, or an error message if failed.
    handler: async () => {
      try {
        const carriers = await shipStationClient.getCarriers();
        return {
          content: [{ type: "text", text: JSON.stringify(carriers, null, 2) }]
        };
      } catch (error) {
        return {
          content: [{ type: "text", text: error.message }],
          isError: true
        };
      }
    }
  • The Zod schema for the tool, which is empty indicating no input parameters are required.
    schema: {},
  • src/server.js:184-191 (registration)
    The registration loop in the MCP server that registers the 'list_carriers' tool (included via ...carrierTools in the array) by calling server.tool with its name, schema, handler, and description.
    ].forEach(tool => {
      server.tool(
        tool.name,
        tool.schema,
        tool.handler,
        { description: tool.description }
      );
    });
  • Supporting method in ShipStationClient that performs the actual API call to retrieve carriers (GET /carriers), used by the tool handler.
    async getCarriers() {
      return this.request('GET', '/carriers');
    }
Behavior1/5

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Tool has no description.

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

Conciseness1/5

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Tool has no description.

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Completeness1/5

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Tool has no description.

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

Parameters1/5

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Tool has no description.

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

Purpose1/5

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Tool has no description.

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

Usage Guidelines1/5

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

Tool has no description.

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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