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Rekl0w

MCP OpenAPI Discovery

by Rekl0w

detect_openapi

Detect OpenAPI or Swagger documents from a docs or API URL and summarize the API structure.

Instructions

Given a docs or API URL, detect the OpenAPI/Swagger document behind it and summarize the API structure.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesDocs page URL or direct OpenAPI JSON/YAML URL
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It only states the detection and summarization action but does not mention safety (read-only), rate limits, authentication requirements, or what happens if the URL is invalid. This lack of transparency is a significant gap for a tool with no annotations.

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 concise sentence (16 words) that is front-loaded with the core purpose. Every word adds value, and there is no redundancy or filler.

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

Completeness4/5

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

For a simple detection tool with one parameter and no output schema, the description adequately covers the basic functionality. However, it does not describe the output format or limitations, but given the low complexity and high schema coverage, the missing details are not critical.

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

Parameters4/5

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

The input schema has 100% description coverage, but the description adds value by specifying the URL can be a 'Docs page URL or direct OpenAPI JSON/YAML URL', clarifying the acceptable input types. This goes beyond the schema's generic 'Docs page URL...' description.

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 tool's purpose: given a docs or API URL, it detects the OpenAPI/Swagger document and summarizes the API structure. It uses specific verbs and resource (detect, summarize) and distinguishes from sibling tools like call_endpoint or list_endpoints.

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

Usage Guidelines2/5

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

No explicit guidance is provided on when to use this tool versus alternatives. There is no mention of when not to use it or any prerequisites. The description only says 'Given a docs or API URL' without contextualizing usage relative to other tools.

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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