{
  "id": "idempotency-conflict-check",
  "name": "Idempotency observation conflict check",
  "description": "Group supplied attempts by exact scope and idempotency key; find conflicting operation/request or success-result fingerprints and unresolved/stale pending outcomes. Advisory reconciliation only, never retry permission.",
  "category": "workflow-assurance",
  "priceUsd": "0.003",
  "pricingStatus": "proposed-unverified",
  "pricing": {
    "unit": "one successful operation call",
    "proposedNominalUsd": "0.003",
    "sixDecimalTokenBaseUnits": "3000",
    "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": [
    "Find conflicting idempotency keys before retrying an uncertain agent tool call",
    "Triage duplicate success receipts and stale pending attempt logs"
  ],
  "whenToUse": [
    "Find conflicting idempotency keys before retrying an uncertain agent tool call",
    "Triage duplicate success receipts and stale pending attempt logs"
  ],
  "whenNotToUse": [
    "Executing tools, sending messages, retrying effects, restoring state, or contacting live services",
    "Authenticating evidence, verifying signatures or identities, granting permission, or enforcing authorization",
    "Inferring facts omitted from the supplied artifact snapshot or guaranteeing exactly-once execution"
  ],
  "capabilities": [
    "idempotency-conflict-v1 profile",
    "Exact (scope,key) grouping and operation/request fingerprints",
    "Conflicting successful responses and unresolved outcome review dispositions",
    "Advisory only; authorizationGranted=false; identityVerified=false; execution=false; externalRequests=0"
  ],
  "limits": {
    "inputBytes": 100000,
    "outputBytes": 400000,
    "jsonNodes": 12000,
    "depth": 20,
    "findings": 200,
    "events": 256,
    "actors": 32,
    "traceSteps": 128,
    "observations": 256,
    "pendingTimeoutMaxMs": 604800000
  },
  "related": [
    "checkpoint-handoff-check",
    "retry-schedule-plan",
    "replay-divergence-check"
  ],
  "errorCodes": [
    "INPUT_LIMIT",
    "OUTPUT_LIMIT",
    "COMPLEXITY_LIMIT",
    "INVALID_NUMBER",
    "INVALID_UNICODE",
    "UNSAFE_KEY",
    "ACTOR_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": "idempotency-conflict-check",
      "operation.category": "workflow-assurance",
      "limit.httpRequestBytes": 131072,
      "limit.requestBytes": 100000,
      "limit.responseBytes": 524288,
      "limit.resultBytes": 400000,
      "limit.jsonDepth": 20,
      "limit.jsonNodes": 12000,
      "coordination.profile": "idempotency-conflict-v1",
      "coordination.advisoryOnly": true,
      "coordination.authorizationGranted": false,
      "coordination.identityVerified": false,
      "coordination.currentTimeLookup": false,
      "coordination.executesRecovery": false,
      "coordination.persistentState": false,
      "coordination.exactlyOnceGuarantee": false,
      "coordination.omissionDetectionComplete": false,
      "idempotency.maxObservations": 256,
      "idempotency.grouping": "exact-scope-and-key",
      "idempotency.retryPermission": false,
      "idempotency.providerSettlementVerified": false,
      "jsonDigest.profile": "sorted-json-sha256-v1",
      "jsonDigest.rfc8785": false,
      "input.asOfMs.maximum": 9007199254740991,
      "input.asOfMs.minimum": 0,
      "input.pendingTimeoutMs.maximum": 604800000,
      "input.pendingTimeoutMs.minimum": 1,
      "input.observations.maxItems": 256
    },
    "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.",
    "preflight": "/preflight"
  },
  "documentation": "/reference/tools/idempotency-conflict-check.md",
  "serviceContract": "/reference/services/idempotency-conflict-check.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/idempotency-conflict-check",
    "mpp": "/v1/mpp/idempotency-conflict-check"
  },
  "inputSchema": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "asOfMs": {
        "type": "integer",
        "minimum": 0,
        "maximum": 9007199254740991
      },
      "pendingTimeoutMs": {
        "type": "integer",
        "minimum": 1,
        "maximum": 604800000
      },
      "observations": {
        "maxItems": 256,
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "id": {
              "type": "string",
              "minLength": 1,
              "maxLength": 100
            },
            "scope": {
              "type": "string",
              "minLength": 1,
              "maxLength": 100
            },
            "key": {
              "type": "string",
              "minLength": 1,
              "maxLength": 100
            },
            "operation": {
              "type": "string",
              "minLength": 1,
              "maxLength": 100
            },
            "request": {
              "$ref": "#/$defs/__schema0"
            },
            "observedAtMs": {
              "type": "integer",
              "minimum": 0,
              "maximum": 9007199254740991
            },
            "status": {
              "type": "string",
              "enum": [
                "pending",
                "success",
                "failure",
                "unknown"
              ]
            },
            "result": {
              "$ref": "#/$defs/__schema0"
            }
          },
          "required": [
            "id",
            "scope",
            "key",
            "operation",
            "request",
            "observedAtMs",
            "status"
          ],
          "additionalProperties": false
        }
      }
    },
    "required": [
      "asOfMs",
      "pendingTimeoutMs",
      "observations"
    ],
    "additionalProperties": false,
    "$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": "idempotency-conflict-check",
        "type": "string"
      },
      "version": {
        "const": "0.29.0",
        "type": "string"
      },
      "result": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object",
        "properties": {
          "profile": {
            "type": "string",
            "const": "idempotency-conflict-v1"
          },
          "consistent": {
            "type": "boolean"
          },
          "advisoryOnly": {
            "type": "boolean",
            "const": true
          },
          "digestProfile": {
            "type": "string",
            "const": "sorted-json-sha256-v1"
          },
          "groups": {
            "maxItems": 256,
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "scope": {
                  "type": "string",
                  "minLength": 1,
                  "maxLength": 100
                },
                "key": {
                  "type": "string",
                  "minLength": 1,
                  "maxLength": 100
                },
                "observationIds": {
                  "maxItems": 256,
                  "type": "array",
                  "items": {
                    "type": "string",
                    "minLength": 1,
                    "maxLength": 100
                  }
                },
                "requestSha256s": {
                  "maxItems": 256,
                  "type": "array",
                  "items": {
                    "type": "string",
                    "pattern": "^[a-f0-9]{64}$"
                  }
                },
                "successfulResultSha256s": {
                  "maxItems": 256,
                  "type": "array",
                  "items": {
                    "type": "string",
                    "pattern": "^[a-f0-9]{64}$"
                  }
                },
                "conflict": {
                  "type": "boolean"
                },
                "unknownOutcome": {
                  "type": "boolean"
                },
                "stalePending": {
                  "type": "boolean"
                },
                "disposition": {
                  "type": "string",
                  "enum": [
                    "reconcile_conflict",
                    "reconcile_unknown",
                    "await_pending",
                    "inspect_recorded_success",
                    "inspect_failed_attempts"
                  ]
                }
              },
              "required": [
                "scope",
                "key",
                "observationIds",
                "requestSha256s",
                "successfulResultSha256s",
                "conflict",
                "unknownOutcome",
                "stalePending",
                "disposition"
              ],
              "additionalProperties": false
            }
          },
          "limitations": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "findings": {
            "maxItems": 200,
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "code": {
                  "type": "string"
                },
                "severity": {
                  "type": "string",
                  "enum": [
                    "error",
                    "warning"
                  ]
                },
                "path": {
                  "type": "string"
                },
                "message": {
                  "type": "string"
                },
                "relatedIds": {
                  "maxItems": 8,
                  "type": "array",
                  "items": {
                    "type": "string",
                    "minLength": 1,
                    "maxLength": 100
                  }
                }
              },
              "required": [
                "code",
                "severity",
                "path",
                "message",
                "relatedIds"
              ],
              "additionalProperties": false
            }
          },
          "findingCount": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "errorCount": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "truncated": {
            "type": "boolean"
          }
        },
        "required": [
          "profile",
          "consistent",
          "advisoryOnly",
          "digestProfile",
          "groups",
          "limitations",
          "findings",
          "findingCount",
          "errorCount",
          "truncated"
        ],
        "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": {
    "asOfMs": 10000,
    "pendingTimeoutMs": 5000,
    "observations": [
      {
        "id": "attempt-1",
        "scope": "orders:create",
        "key": "job-42",
        "operation": "create-order",
        "request": {
          "sku": "A",
          "quantity": 1
        },
        "observedAtMs": 1000,
        "status": "unknown"
      },
      {
        "id": "attempt-2",
        "scope": "orders:create",
        "key": "job-42",
        "operation": "create-order",
        "request": {
          "sku": "A",
          "quantity": 2
        },
        "observedAtMs": 2000,
        "status": "pending"
      }
    ]
  },
  "exampleResponse": {
    "operation": "idempotency-conflict-check",
    "version": "0.29.0",
    "result": {
      "profile": "idempotency-conflict-v1",
      "consistent": false,
      "advisoryOnly": true,
      "digestProfile": "sorted-json-sha256-v1",
      "groups": [
        {
          "scope": "orders:create",
          "key": "job-42",
          "observationIds": [
            "attempt-1",
            "attempt-2"
          ],
          "requestSha256s": [
            "7488fe0cd2d6e45a4a0200317d4531f76a5eb754864f5c1b9198d9f23380e1e5",
            "f9d1806b28d3a6f92838c9d28bb6fd8832fc04dc74668f7427e989973d65527d"
          ],
          "successfulResultSha256s": [],
          "conflict": true,
          "unknownOutcome": true,
          "stalePending": true,
          "disposition": "reconcile_conflict"
        }
      ],
      "limitations": [
        "The namespace is exactly (scope,key); provider retention windows and key-generation changes are not inferred.",
        "No result authorizes a retry, proves that an effect occurred once, or checks a provider's live idempotency store.",
        "Pending and unknown records remain unresolved even if another record reports success; caller reconciliation is required.",
        "Request fingerprints cover operation and request. Successful-result hashes cover supplied JSON only and are not authenticated receipts."
      ],
      "findings": [
        {
          "code": "UNKNOWN_OUTCOME",
          "severity": "warning",
          "path": "/observations/0/status",
          "message": "Reconcile provider evidence before considering another attempt",
          "relatedIds": [
            "attempt-1"
          ]
        },
        {
          "code": "STALE_PENDING",
          "severity": "warning",
          "path": "/observations/1",
          "message": "Pending observation exceeded the supplied review timeout; this does not prove failure",
          "relatedIds": [
            "attempt-2"
          ]
        },
        {
          "code": "KEY_REQUEST_CONFLICT",
          "severity": "error",
          "path": "/observations/0/key",
          "message": "The same scope and key were used for different operation/request fingerprints",
          "relatedIds": [
            "attempt-1",
            "attempt-2"
          ]
        }
      ],
      "findingCount": 3,
      "errorCount": 1,
      "truncated": false
    },
    "provenance": {
      "inputSha256": "6eefc98b638cd666018d9da7909bff489df07808a56386ae3571e13cb517cc6b",
      "outputSha256": "9574ce734c89446b01aa669ff3910e3a98b76f8b9c5612cd0484bce978afd441",
      "deterministic": true,
      "externalRequests": 0
    }
  },
  "requiredHeaders": {
    "Content-Type": "application/json",
    "Idempotency-Key": "random 16–128 character operation identifier"
  },
  "fixedExample": "/reference/examples/idempotency-conflict-check.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."
  }
}