OpenAPI Client Generator MCP

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generate_client

Generate a TypeScript API client from an OpenAPI specification by providing the spec location, output directory, and preferred HTTP client.

Instructions

Generate TypeScript API client from OpenAPI specification

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": {
      "input": "<input>",
      "output": "<output>",
      "httpClient": "<httpClient>"
    },
    "name": "generate_client"
  }
}

Input Schema

Name	Required	Description
`input`	Yes	URL or file path to OpenAPI specification
`output`	Yes	Output directory for generated client
`httpClient`	Yes	HTTP client to use (fetch or axios)

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Aug 18, 2025

TDQS

B3.4/5.0

Behavior2/5

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

No annotations are provided, so the description carries full burden for behavioral traits. It does not disclose side effects (e.g., file creation, overwriting), dependencies (valid spec), permissions, or error conditions. This is a significant gap for a generation 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, precise sentence with no wasted words. It is appropriately sized for a straightforward generation tool with three well-defined parameters.

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 no output schema and no annotations, the description is incomplete. It lacks details on what the generated client includes, whether existing files are overwritten, and any runtime behaviors. More context is needed for an AI agent to use it correctly.

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 parameter descriptions, satisfying the baseline. The tool description does not add any additional parameter semantics beyond what the schema already provides.

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 action ('Generate'), the output ('TypeScript API client'), and the source ('from OpenAPI specification'). It is specific and distinguishes the tool from any potential siblings (none defined).

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?

No explicit guidance on when or when not to use the tool. While there are no sibling tools, the description lacks context such as prerequisites (valid OpenAPI spec) or best practices for selecting the HTTP client.

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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