{
  "id": "records-join",
  "name": "Typed guarded record join",
  "description": "WHEN TO USE: Produce actual inner, left or full joined row pairs from two supplied tables using typed scalar JSON Pointer keys. Enforces declared cardinality over both complete inputs before matching; duplicate null-containing keys count for uniqueness even when nullKeys=never-match. Preserves provenance and order, rejects fanout overruns without partial output. No coercion, fuzzy matching, database access or semantic relationship verification.",
  "category": "structured",
  "priceUsd": "0.005",
  "pricingStatus": "proposed-unverified",
  "pricing": {
    "unit": "one successful operation call",
    "proposedNominalUsd": "0.005",
    "sixDecimalTokenBaseUnits": "5000",
    "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": [
    "Join two tables while retaining source rows and indexes",
    "Enrich records with a typed lookup and guard duplicate keys",
    "Build inner left or full joins with explicit many-to-many fanout"
  ],
  "whenToUse": [
    "Join two tables while retaining source rows and indexes",
    "Enrich records with a typed lookup and guard duplicate keys",
    "Build inner left or full joins with explicit many-to-many fanout"
  ],
  "whenNotToUse": [
    "Fuzzy or semantic entity matching, coercing scalar keys, or proving a business relationship",
    "Silently combining colliding columns or truncating a join to fit a cap",
    "Fetching data, executing caller code, contacting agents, transmitting a payload, or changing remote state",
    "Verifying semantic truth, source authenticity, identity, permissions, or business relationships"
  ],
  "capabilities": [
    "Typed composite scalar keys distinguish number, string, boolean and null",
    "Checks declared uniqueness over entire inputs including unmatched and null-containing keys",
    "Preflights all output row cardinality; stable left/right provenance pairs",
    "Networkless deterministic transforms; externalRequests=0; semanticValidityVerified=false"
  ],
  "limits": {
    "inputBytes": 100000,
    "outputBytes": 400000,
    "jsonNodes": 12000,
    "depth": 20,
    "maxRowsPerSide": 500,
    "maxKeyPairs": 5,
    "maxPointerSegments": 20,
    "maxOutputRows": 2000,
    "nullUniqueness": "null-containing keys count toward uniqueness"
  },
  "related": [
    "record-relations",
    "records-project",
    "records-filter"
  ],
  "errorCodes": [
    "INPUT_LIMIT",
    "OUTPUT_LIMIT",
    "COMPLEXITY_LIMIT",
    "INVALID_JSON",
    "INVALID_NUMBER",
    "INVALID_UNICODE",
    "UNSAFE_KEY",
    "INVALID_POINTER",
    "MISSING_KEY",
    "INVALID_KEY",
    "CARDINALITY_VIOLATION",
    "OUTPUT_ROW_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": "records-join",
      "operation.category": "structured",
      "limit.httpRequestBytes": 131072,
      "limit.requestBytes": 100000,
      "limit.responseBytes": 524288,
      "limit.resultBytes": 400000,
      "limit.jsonDepth": 20,
      "limit.jsonNodes": 12000,
      "join.profile": "typed-records-join-v1",
      "join.maxRowsPerSide": 500,
      "join.maxKeyPairs": 5,
      "join.maxOutputRows": 2000,
      "join.keyCoercion": false,
      "join.fuzzyMatching": false,
      "join.cardinalityCheckedBeforeMaterialization": true,
      "join.resultColumnMerging": false,
      "input.left.maxItems": 500,
      "input.right.maxItems": 500,
      "input.keys.maxItems": 5,
      "input.keys.minItems": 1,
      "input.maxOutputRows.maximum": 2000,
      "input.maxOutputRows.minimum": 0
    },
    "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.",
    "preflight": "/preflight"
  },
  "documentation": "/reference/tools/records-join.md",
  "serviceContract": "/reference/services/records-join.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/records-join",
    "mpp": "/v1/mpp/records-join"
  },
  "inputSchema": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "left": {
        "maxItems": 500,
        "type": "array",
        "items": {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {
            "$ref": "#/$defs/__schema0"
          }
        }
      },
      "right": {
        "maxItems": 500,
        "type": "array",
        "items": {
          "type": "object",
          "propertyNames": {
            "type": "string"
          },
          "additionalProperties": {
            "$ref": "#/$defs/__schema0"
          }
        }
      },
      "keys": {
        "minItems": 1,
        "maxItems": 5,
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "left": {
              "type": "string",
              "maxLength": 2048,
              "description": "RFC 6901 string pointer, at most 20 segments. Empty pointer selects the row object, which is not a scalar join key. No URI fragments or reserved property segments."
            },
            "right": {
              "type": "string",
              "maxLength": 2048,
              "description": "RFC 6901 string pointer, at most 20 segments. Empty pointer selects the row object, which is not a scalar join key. No URI fragments or reserved property segments."
            }
          },
          "required": [
            "left",
            "right"
          ],
          "additionalProperties": false
        }
      },
      "kind": {
        "type": "string",
        "enum": [
          "inner",
          "left",
          "full"
        ]
      },
      "cardinality": {
        "default": "many-to-one",
        "type": "string",
        "enum": [
          "one-to-one",
          "many-to-one",
          "many-to-many"
        ]
      },
      "nullKeys": {
        "default": "never-match",
        "type": "string",
        "enum": [
          "never-match",
          "match"
        ]
      },
      "maxOutputRows": {
        "type": "integer",
        "minimum": 0,
        "maximum": 2000
      }
    },
    "required": [
      "left",
      "right",
      "keys",
      "kind",
      "maxOutputRows"
    ],
    "additionalProperties": false,
    "$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": "records-join",
        "type": "string"
      },
      "version": {
        "const": "0.29.0",
        "type": "string"
      },
      "result": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object",
        "properties": {
          "profile": {
            "type": "string",
            "const": "typed-records-join-v1"
          },
          "kind": {
            "type": "string",
            "enum": [
              "inner",
              "left",
              "full"
            ]
          },
          "cardinality": {
            "type": "string",
            "enum": [
              "one-to-one",
              "many-to-one",
              "many-to-many"
            ]
          },
          "nullKeys": {
            "type": "string",
            "enum": [
              "never-match",
              "match"
            ]
          },
          "rows": {
            "maxItems": 2000,
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "leftIndex": {
                  "anyOf": [
                    {
                      "type": "integer",
                      "minimum": 0,
                      "maximum": 499
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "rightIndex": {
                  "anyOf": [
                    {
                      "type": "integer",
                      "minimum": 0,
                      "maximum": 499
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "left": {
                  "anyOf": [
                    {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {
                        "$ref": "#/properties/result/$defs/__schema0"
                      }
                    },
                    {
                      "type": "null"
                    }
                  ]
                },
                "right": {
                  "anyOf": [
                    {
                      "type": "object",
                      "propertyNames": {
                        "type": "string"
                      },
                      "additionalProperties": {
                        "$ref": "#/properties/result/$defs/__schema0"
                      }
                    },
                    {
                      "type": "null"
                    }
                  ]
                }
              },
              "required": [
                "leftIndex",
                "rightIndex",
                "left",
                "right"
              ],
              "additionalProperties": false
            }
          },
          "outputRows": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "matchedLeftRows": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "unmatchedLeftRows": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "matchedRightRows": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "unmatchedRightRows": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "externalRequests": {
            "type": "number",
            "const": 0
          },
          "semanticValidityVerified": {
            "type": "boolean",
            "const": false
          }
        },
        "required": [
          "profile",
          "kind",
          "cardinality",
          "nullKeys",
          "rows",
          "outputRows",
          "matchedLeftRows",
          "unmatchedLeftRows",
          "matchedRightRows",
          "unmatchedRightRows",
          "externalRequests",
          "semanticValidityVerified"
        ],
        "additionalProperties": false,
        "$defs": {
          "__schema0": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "number"
              },
              {
                "type": "boolean"
              },
              {
                "type": "null"
              },
              {
                "type": "array",
                "items": {
                  "$ref": "#/properties/result/$defs/__schema0"
                }
              },
              {
                "type": "object",
                "propertyNames": {
                  "type": "string"
                },
                "additionalProperties": {
                  "$ref": "#/properties/result/$defs/__schema0"
                }
              }
            ]
          }
        }
      },
      "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": {
    "left": [
      {
        "sku": "A",
        "qty": 2
      },
      {
        "sku": "B",
        "qty": 1
      }
    ],
    "right": [
      {
        "code": "A",
        "label": "Adapters"
      }
    ],
    "keys": [
      {
        "left": "/sku",
        "right": "/code"
      }
    ],
    "kind": "left",
    "cardinality": "many-to-one",
    "nullKeys": "never-match",
    "maxOutputRows": 10
  },
  "exampleResponse": {
    "operation": "records-join",
    "version": "0.29.0",
    "result": {
      "profile": "typed-records-join-v1",
      "kind": "left",
      "cardinality": "many-to-one",
      "nullKeys": "never-match",
      "rows": [
        {
          "leftIndex": 0,
          "rightIndex": 0,
          "left": {
            "sku": "A",
            "qty": 2
          },
          "right": {
            "code": "A",
            "label": "Adapters"
          }
        },
        {
          "leftIndex": 1,
          "rightIndex": null,
          "left": {
            "sku": "B",
            "qty": 1
          },
          "right": null
        }
      ],
      "outputRows": 2,
      "matchedLeftRows": 1,
      "unmatchedLeftRows": 1,
      "matchedRightRows": 1,
      "unmatchedRightRows": 0,
      "externalRequests": 0,
      "semanticValidityVerified": false
    },
    "provenance": {
      "inputSha256": "2a6e27489652f9ea391dd0820684e8a9690cbe8d4028b086ee11cdd12dc51022",
      "outputSha256": "68a134752f33121788d4152199e9678ecea72b4e7e92ca50d19e0eb40fdbc57b",
      "deterministic": true,
      "externalRequests": 0
    }
  },
  "requiredHeaders": {
    "Content-Type": "application/json",
    "Idempotency-Key": "random 16–128 character operation identifier"
  },
  "fixedExample": "/reference/examples/records-join.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."
  }
}