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Agent Contract Guard: JSON Schema Breaking Change Check
x402
Agent Contract Guard: JSON Schema Breaking Change Check is a paid API for AI agents from agentguard.weatherriskapi.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-13).
Compares two JSON schemas to detect breaking changes and compatibility issues that could break API clients or AI agent tool contracts before deployment.
Price / call$0.005
Success—
StatusUnknown
How this service works
Compare old and new JSON schemas to detect compatibility issues and schema drift, validate API and MCP tool contract changes, and identify updates that could break clients before deployment or agent adoption.
Output
Returns a list of detected changes between the two schemas, each annotated with the change kind (e.g. property_added, required_added), the JSON path affected, a human-readable message, and whether the change is breaking. Also returns aggregate counts of total changes and breaking changes, plus a top-level boolean indicating whether any breaking change was detected.
Example use cases
Pre-deployment API contract validation
“I'm about to deploy a new version of my API — here's the old response schema and the updated one. Can you check if any of the changes would break existing clients?”
MCP tool definition compatibility check
“I updated my MCP tool's input schema to add a new required field. Compare the old and new schema definitions and tell me if this change would break any agents already using the old tool contract.”
Catching schema drift in CI pipeline
“Before I merge this PR, compare the baseline JSON schema with the proposed one and flag any breaking changes like removed properties or newly required fields that could cause client failures.”
Technical details
Endpoint
POSThttps://agentguard.weatherriskapi.com/v1/schema/diff?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically detect whether a JSON schema change is backward-compatible before deploying an API update, publishing a new MCP tool definition, or releasing a new agent capability. It is especially valuable in CI/CD pipelines, agent orchestration systems, and API versioning workflows where breaking changes must be caught before clients or agents adopt the new contract.
Side effects
- Invalid or malformed JSON schema input returns a validation error
- Missing old_schema or new_schema fields causes a 400 bad request
- Schemas with circular references may cause unexpected behavior
- Very large or deeply nested schemas may increase response latency
- Payment failure (x402) returns a 402 response before processing begins
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| new_schema | object | |
| old_schema | object |
Output
Schema · Response
{
"type": "json",
"example": {
"changes": [
{
"kind": "property_added",
"path": "$.properties.age",
"after": {
"type": "number"
},
"message": "Property 'age' was added",
"breaking": false
},
{
"kind": "required_added",
"path": "$.required.age",
"after": "age",
"message": "Required field 'age' was added",
"breaking": true
}
],
"breaking": true,
"change_count": 2,
"breaking_count": 1
}
}Tags
x402
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