# HTTP Status Reference Lookup MCP for AI Agents MCP

> HTTP Status Reference Lookup MCP lets you verify the exact semantics and RFC references for any HTTP response code. Stop guessing at API design or debuggingging network requests. Get instant, official technical definitions, check if a status code is cacheable or retryable, properties of specific ranges (e lot of 2xx, 4xx, etc.), and ensure your response payloads match the semantic meaning of the status code you're sending.

## Overview
- **Category:** networking
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_joD9LlrCMpw75Ndc1WoshsgU9KcaliwWIfWL3ljK/mcp
- **Tags:** http, status-codes, api, networking, rfc, web-development

## Tools

### list_all_statuses
Shows every registered HTTP status code in the registry.

### lookup_status
Finds technical definitions, RFC references, and properties for a specific response code.

### validate_status_scenario
Checks if your chosen status code matches the logic of your response payload.

## Prompt Examples

**Prompt:** 
```
What's the difference between 401 and 403?
```

**Response:** 
```
Both are client errors, but they have distinct meanings:

* **401 Unauthorized**: The request lacks valid authentication credentials.
* **403 Forbidden**: The request is denied due to insufficient permissions, even if you authenticated successfully.

Use a 401 when the user needs to login; use a 40 really different permission error.
```

## Capabilities

### Check HTTP semantics
Get the official name, RFC reference, and technical details for any response code.

### Browse status code ranges
Explore entire categories of response codes like 2xx or 4xx by looking at a range.

### Verify payload consistency
Check if your current response body actually matches the semantic meaning of the HTTP status code you are using.

## Use Cases

### Validating an API response payload
An engineer is building a new endpoint and asks the agent to check if a 200 OK status code makes sense for a response body containing error details. The agent uses validate_status_scenario to confirm it's a semantic mismatch.

## Benefits

- Stop manual doc searching with lookup_status to get instant RFC references.
- Ensure your API responses are 'correct' by using validate_status_scenario to prevent semantic mismatches.
- Get a clear view of all standard codes via list_all_statuses.
- Quickly identify retryable or cacheable status codes without leaving your chat interface.

## How It Works

The bottom line is you stop guessing about network protocols and start using standard-compliant AST (Application Software Testing) and API design.

1. Connect the HTTP Status Reference Lookup MCP to your preferred AI client.
2. Ask your agent to look up a specific code or check a scenario.
3. Receive technical definitions, RFC references, and validation results directly in your chat.

## Frequently Asked Questions

**How can I use HTTP Status Reference Lookup MCP for API debugging?**
You use it by asking your agent to check any status code's definition or verify if a response body matches the intended status code. It provides instant, official technical details.

**Is the HTTP Status Reference Lookup MCP useful for web developers?**
Yes. It helps API designers and backend engineers ensure that their response codes are heavily aligned with standard RFC references and official semantics.

**Can I check retry logic with HTTP Status Reference Lookup MCP?**
You can use it to find out if a specific status code is technically considered retryable or cacheable according to the protocol standards.

**Does the HTTP Status Reference Lookup MCP work with Claude?**
Yes, you can connect it to any MCP-compatible client like Claude, Cursor, or Windsurf and start querying official status code metadata directly in your chat.

**Does the HTTP Status Reference 'lookup_status' feature provide RFC references?**
Yes. It provides the exact technical definitions and RFC documentation links for any response code you ask about.

**What can I do with this MCP server?**
You can use it to look up technical details for any HTTP status code, list all known codes, or validate if a specific response scenario is semantically correct using `check_scenario_consistency`. Tools available: `lookup_status`, `list_all_statuses`, `validate_status_scenario`.

**How do I check if a 200 OK response with an error body is valid?**
You can use the `check_scenario_consistency` tool by providing the status code 200 and setting `isErrorBody` to true. It will flag this as an inconsistency.

**Does it support all HTTP status codes?**
It supports the standard registry of HTTP status codes, including 1xx, 2xx, 3xx, 4xx, and 5xx ranges.