response-validation

Name: response-validation
Availability: InStock
Author: vladkesler

Validate API responses against stored schemas to detect drift and structural issues.

39|6|Updated Feb 9, 2026

Search Tags:#monitoring #api #schema #json #drift #validate #response

Ready to run

npx skills add https://github.com/vladkesler/initrunner --skill response-validation

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: response-validation
Source: https://github.com/vladkesler/initrunner/tree/main/examples/roles/api-monitor/skills/response-validation
Command: npx skills add https://github.com/vladkesler/initrunner --skill response-validation

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

API responses often deviate from expected structure or size, leading to unnoticed errors and degraded integrations.

Core Features & Use Cases

Content-Type verification against expected types
JSON validity checks and HTML error-page sniffing
Schema drift detection against stored baseline in semantic memory
Null value checks and size anomaly detection for monitoring

Quick Start

Run a curl request to fetch a sample API response and validate it against the stored schema.

Frequently Asked Questions about response-validation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I detect JSON schema drift in API responses?▼

Detect JSON schema drift in API responses by validating new payloads against a baseline schema stored in semantic memory, checking Content-Type, JSON structure, required fields, and null values to report discrepancies.

What is the best way to validate REST API response size and structure?▼

Validate REST API response size and structure by comparing live payloads against a stored baseline schema, detecting size anomalies, null values, and structural issues to prevent unnoticed integration errors.

How do I check if a REST endpoint is returning HTML error pages instead of JSON?▼

Check if a REST endpoint returns HTML error pages instead of JSON by running response validation, which sniffs for HTML error pages and verifies Content-Type and JSON validity during automated QA checks.

Can I use this for automated QA across microservice endpoints?▼

Yes, you can use this for automated QA across microservice endpoints. It validates REST and JSON integration responses, detecting schema drift and size anomalies to maintain integration stability.

Why do I need a stored baseline schema for API monitoring?▼

You need a stored baseline schema for API monitoring because response validation requires a reference point in semantic memory to accurately detect structural drift, null value issues, and size anomalies in live payloads.

How do I validate API responses after fetching them with curl?▼

Validate API responses after fetching them with curl by passing the response to the validator, which checks Content-Type, JSON structure, and size against the stored baseline schema to identify discrepancies.