Function Calling Schema Tester

Test function/tool-call argument JSON against schema before running agentic workflows.

Schema test passed.

Resolved parameters schema

{
  "type": "object",
  "required": [
    "title",
    "priority",
    "customer_id"
  ],
  "properties": {
    "title": {
      "type": "string"
    },
    "priority": {
      "enum": [
        "low",
        "medium",
        "high"
      ]
    },
    "customer_id": {
      "type": "string"
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  },
  "additionalProperties": false
}

Parsed arguments

{
  "title": "Payment failed",
  "priority": "high",
  "customer_id": "cus_123",
  "tags": [
    "billing",
    "urgent"
  ]
}

About This Tool

Function Calling Schema Tester validates tool-call argument payloads against function parameter schema to prevent runtime failures in agent loops.

Frequently Asked Questions

Do I need full tool schema format?

No. You can provide either full function schema or only the parameters JSON Schema.

Is this full JSON Schema compatibility?

It supports core schema fields used most often in function-calling workflows.

Is any schema data uploaded?

No. Everything runs locally in your browser.

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Compare With Similar Tools

Decision pages to quickly see when to use each tool.

Output Contract Tester vs Function Calling Schema Tester

General output validation rules vs function/tool-call schema conformance validation.

JSON Output Guard vs Function Calling Schema Tester

Strict JSON output schema safety vs tool/function argument payload schema validation.

Workflow Links

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Before This Tool

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