{
  "id": "json-sample-shape-infer",
  "name": "Observed JSON sample shapes",
  "description": "Build an optional, open observational JSON Schema draft and counted evidence from supplied JSON samples; never infer a real API contract.",
  "category": "structured",
  "priceUsd": "0.004",
  "pricingStatus": "proposed-unverified",
  "pricing": {
    "unit": "one successful operation call",
    "proposedNominalUsd": "0.004",
    "sixDecimalTokenBaseUnits": "4000",
    "subscription": false,
    "includesPayerWalletOrNetworkFees": false,
    "liveQuoteVerified": false,
    "condition": "Actual SDK challenge is authoritative only within the caller's explicit authorization; configured six-decimal token peg is an operator assertion, not a conversion guarantee."
  },
  "intents": [
    "infer observational schema from JSON samples",
    "draft sampled JSON structure",
    "count recursive observed types"
  ],
  "whenToUse": [
    "Review a recursive open schema draft inferred from bounded supplied examples",
    "Inspect sample counts, optional properties and unobserved empty-array items"
  ],
  "whenNotToUse": [
    "Establishing a universal API contract or production rejection policy",
    "Inferring required fields, enums, formats, ranges, cross-field correlations or compatibility",
    "Generating a tool definition or assuming generalized fixture-generator compatibility",
    "Network access, filesystem changes, target execution, publishing or deployment"
  ],
  "capabilities": [
    "Fixed null, boolean, number, string, array, object union order using anyOf",
    "All observed numbers emit number; object properties stay optional and additionalProperties stays true",
    "Actual escaped schema pointers identify pooled observations; empty items emit true with zero counts",
    "No required, enum, const, bounds, patterns, formats, defaults, references or closed objects",
    "Pure supplied-input computation; complete bounded result admission before challenge; no external requests"
  ],
  "related": [
    "record-profile",
    "json-schema-check"
  ],
  "limits": {
    "inputBytes": 100000,
    "outputBytes": 300000,
    "jsonNodes": 10000,
    "depth": 20,
    "samples": 64,
    "sourceNodes": 5000,
    "semanticDepth": 8,
    "pooledObjectKeys": 32,
    "observationLocations": 128,
    "emittedSchemaNodes": 180,
    "schemaValidationDepth": 16,
    "schemaRepresentationDepth": 20,
    "keyBytes": 96,
    "aggregateSourceKeyBytes": 64000,
    "aggregateSchemaPointerBytes": 32768,
    "nodeVisits": 5000
  },
  "errorCodes": [
    "INVALID_INPUT",
    "INVALID_JSON",
    "INVALID_NUMBER",
    "INVALID_UNICODE",
    "UNSAFE_KEY",
    "INPUT_LIMIT",
    "OUTPUT_LIMIT",
    "COMPLEXITY_LIMIT",
    "SHAPE_LIMIT"
  ],
  "requirementsProfile": {
    "format": "declared-requirements-v1",
    "facts": {
      "execution.suppliedCode": false,
      "execution.remoteMutation": false,
      "execution.llmInference": false,
      "execution.paidMcp": false,
      "verification.semanticTruth": false,
      "verification.sourceAuthenticity": false,
      "verification.liveVulnerabilities": false,
      "numbers.arbitraryPrecisionJson": false,
      "numbers.model": "ieee754-binary64",
      "privacy.requestBodyPersisted": false,
      "execution.deterministic": true,
      "execution.networkAccess": false,
      "privacy.resultBodyPersisted": false,
      "payment.x402": true,
      "payment.mpp": true,
      "operation.id": "json-sample-shape-infer",
      "operation.category": "structured",
      "limit.httpRequestBytes": 131072,
      "limit.requestBytes": 100000,
      "limit.responseBytes": 524288,
      "limit.resultBytes": 300000,
      "limit.jsonDepth": 20,
      "limit.jsonNodes": 10000,
      "inference.profile": "observed-json-shapes-v1",
      "inference.evidence": "observed-structure-only",
      "inference.contractEstablished": false,
      "inference.unseenBehaviorVerified": false,
      "inference.requiredPropertiesInferred": false,
      "inference.correlationsPreserved": false,
      "inference.closedWorld": false,
      "inference.formatsInferred": false,
      "inference.numericBoundsInferred": false,
      "inference.maxSamples": 64,
      "inference.maxValueNodes": 5000,
      "inference.maxValueDepth": 8,
      "inference.maxObjectKeys": 32,
      "inference.maxObservationLocations": 128,
      "inference.maxSchemaNodes": 180,
      "inference.maxSchemaValidationDepth": 16,
      "inference.maxKeyBytes": 96,
      "inference.maxSourceKeyBytes": 64000,
      "inference.maxSchemaPointerBytes": 32768,
      "inference.numbersEmitNumber": true,
      "inference.emptyArrayItems": "true",
      "inference.futureSchemaUseRequiresReview": true,
      "input.samples.maxItems": 64,
      "input.samples.minItems": 1
    },
    "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.",
    "preflight": "/preflight"
  },
  "documentation": "/reference/tools/json-sample-shape-infer.md",
  "serviceContract": "/reference/services/json-sample-shape-infer.json",
  "errors": [
    {
      "status": 400,
      "meaning": "Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch",
      "retry": "Correct the request before payment"
    },
    {
      "status": 402,
      "meaning": "Payment challenge or rejected payment",
      "retry": "Use official protocol SDK; inspect payment outcome before another payment"
    },
    {
      "status": 409,
      "meaning": "Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN",
      "retry": "Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay"
    },
    {
      "status": 413,
      "meaning": "Input or generated output too large",
      "retry": "Reduce input; no payment attempted for validation failure"
    },
    {
      "status": 415,
      "meaning": "Unsupported media type or compression",
      "retry": "Send uncompressed application/json"
    },
    {
      "status": 422,
      "meaning": "Schema or service-specific semantic validation failure",
      "retry": "Correct input using returned error code; no payment attempted"
    },
    {
      "status": 429,
      "meaning": "Request/payment-attempt rate exceeded",
      "retry": "Wait for rate limit window; preserve existing payment identity"
    },
    {
      "status": 503,
      "meaning": "Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement",
      "retry": "Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation"
    }
  ],
  "numericPrecision": "JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.",
  "paymentWorkflow": {
    "discoveryOnly": false,
    "supportedProtocols": [
      "x402",
      "mpp"
    ],
    "x402": {
      "credentialHeader": "PAYMENT-SIGNATURE",
      "challengeHeader": "PAYMENT-REQUIRED",
      "receiptHeader": "PAYMENT-RESPONSE",
      "version": 2,
      "scheme": "exact",
      "paymentIdentifier": "payment-identifier extension MUST equal the HTTP Idempotency-Key",
      "sdk": "@x402/core with @x402/evm"
    },
    "mpp": {
      "supported": true,
      "credentialHeader": "Authorization",
      "challengeHeader": "WWW-Authenticate",
      "receiptHeader": "Payment-Receipt",
      "method": "tempo",
      "intent": "charge",
      "sdk": "mppx",
      "tokenDecimals": 6
    },
    "steps": [
      "Check configured readiness and the exact service schema",
      "Generate a fresh random Idempotency-Key for this operation; never use a discovery probe fixture for purchases",
      "Send valid input without a credential to obtain the official protocol challenge",
      "Use the official SDK and authorized wallet to fulfill the challenge",
      "Retry only with identical key, body, protocol and credential",
      "On PAYMENT_UNCERTAIN stop and request operator reconciliation; never blindly pay again"
    ],
    "versionedRetries": "Request fingerprint includes service release version. Retries across a version upgrade can conflict; coordinate upgrades outside the 24-hour replay window and reconcile pending attempts.",
    "docs": "/llms.txt"
  },
  "method": "POST",
  "paths": {
    "x402": "/v1/x402/json-sample-shape-infer",
    "mpp": "/v1/mpp/json-sample-shape-infer"
  },
  "inputSchema": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "samples": {
        "minItems": 1,
        "maxItems": 64,
        "type": "array",
        "items": {
          "$ref": "#/$defs/__schema0"
        }
      }
    },
    "required": [
      "samples"
    ],
    "additionalProperties": false,
    "$defs": {
      "__schema0": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "number"
          },
          {
            "type": "boolean"
          },
          {
            "type": "null"
          },
          {
            "type": "array",
            "items": {
              "$ref": "#/$defs/__schema0"
            }
          },
          {
            "type": "object",
            "propertyNames": {
              "type": "string"
            },
            "additionalProperties": {
              "$ref": "#/$defs/__schema0"
            }
          }
        ]
      }
    }
  },
  "outputSchema": {
    "type": "object",
    "required": [
      "operation",
      "version",
      "result",
      "provenance"
    ],
    "properties": {
      "operation": {
        "const": "json-sample-shape-infer",
        "type": "string"
      },
      "version": {
        "const": "0.29.0",
        "type": "string"
      },
      "result": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object",
        "properties": {
          "profile": {
            "type": "string",
            "const": "observed-json-shapes-v1"
          },
          "evidence": {
            "type": "string",
            "const": "observed-structure-only"
          },
          "contractEstablished": {
            "type": "boolean",
            "const": false
          },
          "sampleCount": {
            "type": "integer",
            "minimum": 1,
            "maximum": 64
          },
          "dialect": {
            "type": "string",
            "const": "https://json-schema.org/draft/2020-12/schema"
          },
          "schema": {
            "$ref": "#/properties/result/$defs/__schema0"
          },
          "observations": {
            "minItems": 1,
            "maxItems": 128,
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "schemaPointer": {
                  "type": "string",
                  "maxLength": 4096
                },
                "occurrences": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 5000
                },
                "typeCounts": {
                  "maxItems": 6,
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "type": {
                        "type": "string",
                        "enum": [
                          "null",
                          "boolean",
                          "number",
                          "string",
                          "array",
                          "object"
                        ]
                      },
                      "count": {
                        "type": "integer",
                        "minimum": 1,
                        "maximum": 5000
                      }
                    },
                    "required": [
                      "type",
                      "count"
                    ],
                    "additionalProperties": false
                  }
                },
                "objectOccurrences": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 5000
                },
                "properties": {
                  "maxItems": 32,
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "name": {
                        "type": "string",
                        "maxLength": 96
                      },
                      "presentCount": {
                        "type": "integer",
                        "minimum": 0,
                        "maximum": 5000
                      },
                      "objectCount": {
                        "type": "integer",
                        "minimum": 0,
                        "maximum": 5000
                      }
                    },
                    "required": [
                      "name",
                      "presentCount",
                      "objectCount"
                    ],
                    "additionalProperties": false
                  }
                },
                "elementOccurrences": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 5000
                }
              },
              "required": [
                "schemaPointer",
                "occurrences",
                "typeCounts"
              ],
              "additionalProperties": false
            }
          }
        },
        "required": [
          "profile",
          "evidence",
          "contractEstablished",
          "sampleCount",
          "dialect",
          "schema",
          "observations"
        ],
        "additionalProperties": false,
        "$defs": {
          "__schema0": {
            "anyOf": [
              {
                "type": "boolean",
                "const": true
              },
              {
                "type": "object",
                "properties": {
                  "type": {
                    "type": "string",
                    "enum": [
                      "null",
                      "boolean",
                      "number",
                      "string"
                    ]
                  }
                },
                "required": [
                  "type"
                ],
                "additionalProperties": false
              },
              {
                "type": "object",
                "properties": {
                  "type": {
                    "type": "string",
                    "const": "array"
                  },
                  "items": {
                    "$ref": "#/properties/result/$defs/__schema0"
                  }
                },
                "required": [
                  "type",
                  "items"
                ],
                "additionalProperties": false
              },
              {
                "type": "object",
                "properties": {
                  "type": {
                    "type": "string",
                    "const": "object"
                  },
                  "properties": {
                    "type": "object",
                    "propertyNames": {
                      "type": "string"
                    },
                    "additionalProperties": {
                      "$ref": "#/properties/result/$defs/__schema0"
                    }
                  },
                  "additionalProperties": {
                    "type": "boolean",
                    "const": true
                  }
                },
                "required": [
                  "type",
                  "properties",
                  "additionalProperties"
                ],
                "additionalProperties": false
              },
              {
                "type": "object",
                "properties": {
                  "anyOf": {
                    "minItems": 2,
                    "maxItems": 6,
                    "type": "array",
                    "items": {
                      "$ref": "#/properties/result/$defs/__schema0"
                    }
                  }
                },
                "required": [
                  "anyOf"
                ],
                "additionalProperties": false
              }
            ]
          }
        }
      },
      "provenance": {
        "type": "object",
        "required": [
          "inputSha256",
          "outputSha256",
          "deterministic",
          "externalRequests"
        ],
        "properties": {
          "inputSha256": {
            "type": "string",
            "pattern": "^[a-f0-9]{64}$"
          },
          "outputSha256": {
            "type": "string",
            "pattern": "^[a-f0-9]{64}$"
          },
          "deterministic": {
            "const": true
          },
          "externalRequests": {
            "const": 0
          }
        }
      }
    },
    "additionalProperties": false
  },
  "exampleInput": {
    "samples": [
      {
        "id": 1,
        "tag": "a",
        "tags": []
      },
      {
        "id": 2,
        "tag": null,
        "tags": [
          "x"
        ]
      }
    ]
  },
  "exampleResponse": {
    "operation": "json-sample-shape-infer",
    "version": "0.29.0",
    "result": {
      "profile": "observed-json-shapes-v1",
      "evidence": "observed-structure-only",
      "contractEstablished": false,
      "sampleCount": 2,
      "dialect": "https://json-schema.org/draft/2020-12/schema",
      "schema": {
        "type": "object",
        "properties": {
          "id": {
            "type": "number"
          },
          "tag": {
            "anyOf": [
              {
                "type": "null"
              },
              {
                "type": "string"
              }
            ]
          },
          "tags": {
            "type": "array",
            "items": {
              "type": "string"
            }
          }
        },
        "additionalProperties": true
      },
      "observations": [
        {
          "schemaPointer": "",
          "occurrences": 2,
          "typeCounts": [
            {
              "type": "object",
              "count": 2
            }
          ],
          "objectOccurrences": 2,
          "properties": [
            {
              "name": "id",
              "presentCount": 2,
              "objectCount": 2
            },
            {
              "name": "tag",
              "presentCount": 2,
              "objectCount": 2
            },
            {
              "name": "tags",
              "presentCount": 2,
              "objectCount": 2
            }
          ]
        },
        {
          "schemaPointer": "/properties/id",
          "occurrences": 2,
          "typeCounts": [
            {
              "type": "number",
              "count": 2
            }
          ]
        },
        {
          "schemaPointer": "/properties/tag",
          "occurrences": 2,
          "typeCounts": [
            {
              "type": "null",
              "count": 1
            },
            {
              "type": "string",
              "count": 1
            }
          ]
        },
        {
          "schemaPointer": "/properties/tags",
          "occurrences": 2,
          "typeCounts": [
            {
              "type": "array",
              "count": 2
            }
          ],
          "elementOccurrences": 1
        },
        {
          "schemaPointer": "/properties/tags/items",
          "occurrences": 1,
          "typeCounts": [
            {
              "type": "string",
              "count": 1
            }
          ]
        }
      ]
    },
    "provenance": {
      "inputSha256": "cd6d60c9fe4a6bf4587ba834b28f344a6e856e95e517470ced05bb3f24dedeed",
      "outputSha256": "f482c987df131aeecd8ca5571ce7edc472358b72167e0f4ca417278c34d7b52a",
      "deterministic": true,
      "externalRequests": 0
    }
  },
  "requiredHeaders": {
    "Content-Type": "application/json",
    "Idempotency-Key": "random 16–128 character operation identifier"
  },
  "fixedExample": "/reference/examples/json-sample-shape-infer.json",
  "execution": {
    "deterministic": true,
    "externalRequests": 0,
    "maxExternalRequests": 0,
    "resultSnapshotPersisted": false,
    "fixedExampleIsIllustrativeSnapshot": false,
    "requiresPayment": true,
    "supportsMcpExecution": false
  },
  "releaseSnapshot": {
    "format": "static-release-reference-v1",
    "sourceVersion": "0.29.0",
    "sourceRegistrySha256": "a2b5ec09bf6c38b9d2879d746a4fded374f5928b445377b0270ef6aa8e6cac65",
    "generatedAt": "2026-10-06T15:38:00Z",
    "releaseAcceptance": "not-verified-by-generator",
    "runtimeReadiness": "not-evaluated",
    "livePaymentsVerified": false,
    "indexingVerified": false,
    "apiOrigin": null,
    "notice": "Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment."
  }
}