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zebbern

Webhook.site MCP Server

by zebbern

wait_for_request

Wait for a new HTTP request to be received by a webhook using real-time streaming, eliminating the need for polling. Ideal for testing webhooks, callbacks, and API integrations.

Instructions

Wait for a new HTTP request to be received by the webhook. Uses real-time streaming (SSE) to efficiently wait without polling. Useful for testing webhooks, callbacks, and API integrations.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
request_typeNoFilter by request type: 'web' (HTTP requests), 'email', or 'dns'. Leave empty for any type.
webhook_tokenYesThe webhook token (UUID) from webhook.site
timeout_secondsNoMaximum time to wait in seconds (default: 60)
Behavior2/5

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

No annotations provided, so description carries full burden. Mentions SSE streaming to avoid polling, but lacks disclosure of what happens after waiting (e.g., returns the request, blocks until timeout, or whether webhook must be pre-created). Incomplete for a blocking operation.

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?

Three concise sentences, front-loaded with action and mechanism, no redundant or unnecessary information.

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

Completeness3/5

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

For a simple tool with 3 parameters and no output schema, the description covers basic purpose and use case. However, missing details about return value, required prerequisites (e.g., existing webhook), and timeout behavior hinder completeness.

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 three parameters. Description adds no extra semantics beyond schema, so baseline score of 3 is appropriate.

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

Purpose4/5

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

Description clearly states verb 'wait' and resource 'new HTTP request', and mentions SSE streaming for efficiency. It distinguishes from siblings like 'wait_for_email' by focusing on HTTP requests, but does not explicitly differentiate from 'check_for_callbacks'.

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?

States 'useful for testing webhooks, callbacks, and API integrations', giving context. However, no explicit when-not-to-use or alternatives like 'check_for_callbacks' are mentioned, leaving usage guidance implied.

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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