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Webhook.site MCP Server

by zebbern

create_webhook_with_config

Create a webhook endpoint with custom response content, status, timeout, CORS, and alias to capture and inspect HTTP requests.

Instructions

Create a new webhook.site endpoint with custom configuration (response content, status, timeout, CORS, alias).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
corsNoEnable CORS headers for cross-domain requests
aliasNoCustom alias for the webhook URL (3-32 alphanumeric chars)
expiryNoSeconds until webhook auto-expires (max 604800 = 1 week)
timeoutNoSeconds to wait before returning response (0-30)
default_statusNoDefault HTTP response status code (200-599)
default_contentNoDefault response content/body
default_content_typeNoDefault response Content-Type headertext/html
Behavior2/5

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

No annotations are provided, so the description must carry the full burden. It fails to disclose any behavioral traits such as whether the action is destructive (it creates), authentication needs, or side effects. Minimal transparency beyond the basic action.

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?

A single sentence of 17 words that is front-loaded with the action and includes key configuration options. No wasted words; every element earns its place.

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?

The description does not mention the return value (e.g., created webhook URL or ID) or that all parameters are optional. Given 7 parameters and no output schema, more contextual information is needed for an agent to understand the tool's behavior fully.

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 descriptions for all 7 parameters. The description merely lists parameter categories without adding new meaning or constraints beyond the schema. Baseline score of 3 is appropriate.

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 uses a specific verb 'create' and resource 'webhook.site endpoint', and explicitly lists configurable options (response content, status, timeout, CORS, alias). It distinguishes from sibling 'create_webhook' by highlighting 'custom configuration'.

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?

The description implies usage for creating webhooks with custom settings but does not explicitly contrast with 'create_webhook' or provide when-not-to-use guidance. Sibling differentiation is implied but not stated.

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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