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gulbaki

Swagger/OpenAPI MCP Server

by gulbaki

list_apis

List available API specifications loaded in the Swagger/OpenAPI MCP Server to explore and interact with documented endpoints.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • src/index.ts:309-329 (registration)
    Registration of the 'list_apis' tool using this.server.tool(), including empty input schema {} and inline handler function.
      "list_apis",
      {},
      async () => {
        const apiList = Array.from(this.apis.entries()).map(([id, api]) => ({
          id,
          title: api.spec.info?.title || id,
          version: api.spec.info?.version,
          description: api.spec.info?.description,
          pathCount: Object.keys(api.spec.paths || {}).length
        }));
    
        return {
          content: [{
            type: "text",
            text: apiList.length > 0 
              ? JSON.stringify(apiList, null, 2)
              : "No APIs loaded. Use the load_api tool to load an API specification."
          }]
        };
      }
    );
  • The handler function that executes the list_apis tool logic: iterates over loaded APIs, formats a list with id, title, version, description, pathCount, and returns as JSON or a message if none loaded.
      const apiList = Array.from(this.apis.entries()).map(([id, api]) => ({
        id,
        title: api.spec.info?.title || id,
        version: api.spec.info?.version,
        description: api.spec.info?.description,
        pathCount: Object.keys(api.spec.paths || {}).length
      }));
    
      return {
        content: [{
          type: "text",
          text: apiList.length > 0 
            ? JSON.stringify(apiList, null, 2)
            : "No APIs loaded. Use the load_api tool to load an API specification."
        }]
      };
    }
Behavior1/5

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

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

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

Tool has no description.

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

Completeness1/5

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

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

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

Tool has no description.

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

Purpose1/5

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

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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