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agent402.tools Schema Evolution Drift Check
x402
agent402.tools Schema Evolution Drift Check is a paid API for AI agents from agent402.tools, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).
Diffs two OpenAPI snapshots to detect breaking changes, lint agent-readiness regressions, and extract a structured evolution report for integration maintenance.
Price / call$0.008
Success—
StatusUnknown
How this service works
Bundled execution of the API contract drift check workflow - The 'did this API contract change in a way that breaks our integration?' workflow. Diff two OpenAPI snapshots structurally, lint the new one for agent-readiness regressions, extract the endpoint surface for inventory comparison, validate a known-good payload against the new contract, and summarize security-relevant changes. Six tools, one go/no-go answer on whether the upstream API broke us.
Output
Returns a structured report that includes: a structural diff between the two OpenAPI snapshots highlighting added, removed, and modified endpoints or schemas; a list of breaking changes that could break existing integrations; and lint findings on agent-readiness regressions in the new spec.
Example use cases
Example prompt
“Can you check whether our API integration is broken by the latest spec update? Here's the old OpenAPI snapshot and the new one — diff them structurally, flag any breaking changes, and lint the new version for agent-readiness regressions.”
Technical details
Endpoint
POSThttps://agent402.tools/api/skill/schema-evolutionWhen to prefer
Choose this endpoint when you need a bundled, single-call workflow that combines structural diffing, breaking change detection, AND agent-readiness linting in one step. Prefer it over a manual multi-step pipeline when you want a holistic API contract drift report without orchestrating separate tools.
Side effects
- Invalid or unparseable YAML/JSON in either spec field — returns parse error
- Missing oldSpec or newSpec — returns validation error for required fields
- Specs that are too large to process within timeout — may return timeout or truncation error
- Non-OpenAPI documents submitted as specs — may return schema mismatch or empty diff
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| newSpec | string | the current OpenAPI snapshot as a JSON document (object or JSON string) |
| oldSpec | string | the prior OpenAPI snapshot as a JSON document (object or JSON string) |
Output
Schema · Response
{
"type": "json",
"example": {
"args": {
"newSpec": "{\"openapi\":\"3.0.3\",\"info\":{\"title\":\"Orders API\",\"version\":\"1.1.0\"},\"paths\":{\"/v1/orders\":{\"post\":{\"operationId\":\"createOrder\",\"requestBody\":{\"required\":true,\"content\":{\"application/json\":{\"schema\":{\"type\":\"object\",\"required\":[\"customerId\",\"currency\"],\"properties\":{\"customerId\":{\"type\":\"string\"},\"currency\":{\"type\":\"string\"}}}}}},\"responses\":{\"201\":{\"description\":\"created\"}}}}}}",
"oldSpec": "{\"openapi\":\"3.0.3\",\"info\":{\"title\":\"Orders API\",\"version\":\"1.0.0\"},\"paths\":{\"/v1/orders\":{\"post\":{\"operationId\":\"createOrder\",\"requestBody\":{\"required\":true,\"content\":{\"application/json\":{\"schema\":{\"type\":\"object\",\"required\":[\"customerId\"],\"properties\":{\"customerId\":{\"type\":\"string\"},\"currency\":{\"type\":\"string\"}}}}}},\"responses\":{\"201\":{\"description\":\"created\"}}}}}}"
},
"pack": "schema-evolution",
"steps": [
{
"ok": true,
"slug": "openapi-diff",
"result": {}
},
{
"ok": true,
"slug": "openapi-lint",
"result": {}
},
{
"ok": true,
"slug": "openapi-extract",
"result": {}
},
{
"ok": true,
"slug": "openapi-required-params",
"result": {}
},
{
"ok": true,
"slug": "openapi-validate-payload",
"result": {}
},
{
"ok": true,
"slug": "openapi-security-summary",
"result": {}
}
],
"summary": "6/6 steps succeeded"
}
}Tags
x402
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