{
  "id": "unified-diff-apply",
  "name": "Exact Unified Patch Application",
  "description": "Apply a single-file supplied unified diff to supplied LF text with exact old/new hunk positions, exact context matching, final-newline markers and optional source digest/label assertions. Labels are inert metadata. No fuzzy offsets, Git prelude, filesystem writes or external content.",
  "category": "document-assurance",
  "priceUsd": "0.01",
  "pricingStatus": "proposed-unverified",
  "pricing": {
    "unit": "one successful operation call",
    "proposedNominalUsd": "0.01",
    "sixDecimalTokenBaseUnits": "10000",
    "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": [
    "Validate and apply a model-generated unified patch to supplied document text",
    "Reject stale patch context before accepting a document revision"
  ],
  "whenToUse": [
    "Validate and apply a model-generated unified patch to supplied document text",
    "Reject stale patch context before accepting a document revision"
  ],
  "whenNotToUse": [
    "Multi-file patches, Git binary patches, rename metadata, fuzz or CRLF text",
    "Filesystem access, path safety validation, or applying a patch to a repository"
  ],
  "capabilities": [
    "Single ---/+++ header pair and at most 200 exact-position hunks",
    "LF-only text with GNU no-newline markers",
    "New hunk positions must match accumulated line deltas"
  ],
  "related": [
    "lines-diff",
    "text-edits-apply"
  ],
  "limits": {
    "inputBytes": 100000,
    "outputBytes": 400000,
    "jsonNodes": 8000,
    "depth": 20,
    "findings": 200,
    "hunks": 200,
    "sourceLines": 10000,
    "resultLines": 10000,
    "patchLines": 20000,
    "lineEndings": "LF-only"
  },
  "errorCodes": [
    "INPUT_LIMIT",
    "OUTPUT_LIMIT",
    "COMPLEXITY_LIMIT",
    "UNSAFE_KEY",
    "INVALID_UNICODE",
    "INVALID_NUMBER",
    "UNSUPPORTED_LINE_ENDING",
    "INVALID_PATCH",
    "LINE_LIMIT",
    "HUNK_LIMIT",
    "HUNK_RANGE_MISMATCH",
    "PATCH_CONTEXT_MISMATCH",
    "PATCH_LABEL_MISMATCH",
    "SOURCE_DIGEST_MISMATCH"
  ],
  "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": "unified-diff-apply",
      "operation.category": "document-assurance",
      "limit.httpRequestBytes": 131072,
      "limit.requestBytes": 100000,
      "limit.responseBytes": 524288,
      "limit.resultBytes": 400000,
      "limit.jsonDepth": 20,
      "limit.jsonNodes": 8000,
      "standards.fullConformance": false,
      "unifiedDiff.profile": "single-file-exact-unified-v1",
      "unifiedDiff.fuzzyMatching": false,
      "unifiedDiff.multipleFiles": false,
      "unifiedDiff.crlf": false,
      "unifiedDiff.finalNewlineMarkers": true,
      "input.text.maxLength": 90000,
      "input.patch.maxLength": 90000,
      "input.expectedOldLabel.maxLength": 512,
      "input.expectedOldLabel.minLength": 1
    },
    "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.",
    "preflight": "/preflight"
  },
  "documentation": "/reference/tools/unified-diff-apply.md",
  "serviceContract": "/reference/services/unified-diff-apply.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/unified-diff-apply",
    "mpp": "/v1/mpp/unified-diff-apply"
  },
  "inputSchema": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "text": {
        "type": "string",
        "maxLength": 90000
      },
      "patch": {
        "type": "string",
        "maxLength": 90000
      },
      "expectedSha256": {
        "type": "string",
        "pattern": "^[a-fA-F0-9]{64}$"
      },
      "expectedOldLabel": {
        "type": "string",
        "minLength": 1,
        "maxLength": 512
      }
    },
    "required": [
      "text",
      "patch"
    ],
    "additionalProperties": false
  },
  "outputSchema": {
    "type": "object",
    "required": [
      "operation",
      "version",
      "result",
      "provenance"
    ],
    "properties": {
      "operation": {
        "const": "unified-diff-apply",
        "type": "string"
      },
      "version": {
        "const": "0.29.0",
        "type": "string"
      },
      "result": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object",
        "properties": {
          "profile": {
            "type": "string",
            "const": "single-file-exact-unified-v1"
          },
          "text": {
            "type": "string"
          },
          "oldLabel": {
            "type": "string"
          },
          "newLabel": {
            "type": "string"
          },
          "sourceSha256": {
            "type": "string",
            "pattern": "^[a-fA-F0-9]{64}$"
          },
          "resultSha256": {
            "type": "string",
            "pattern": "^[a-fA-F0-9]{64}$"
          },
          "hunks": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "oldStart": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "oldCount": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "newStart": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "newCount": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "added": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "removed": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                },
                "context": {
                  "type": "integer",
                  "minimum": 0,
                  "maximum": 9007199254740991
                }
              },
              "required": [
                "oldStart",
                "oldCount",
                "newStart",
                "newCount",
                "added",
                "removed",
                "context"
              ],
              "additionalProperties": false
            }
          },
          "addedLines": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "removedLines": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          }
        },
        "required": [
          "profile",
          "text",
          "oldLabel",
          "newLabel",
          "sourceSha256",
          "resultSha256",
          "hunks",
          "addedLines",
          "removedLines"
        ],
        "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": {
    "text": "Title\nDraft\n",
    "patch": "--- memo.txt\n+++ memo.txt\n@@ -1,2 +1,2 @@\n Title\n-Draft\n+Approved\n"
  },
  "exampleResponse": {
    "operation": "unified-diff-apply",
    "version": "0.29.0",
    "result": {
      "profile": "single-file-exact-unified-v1",
      "text": "Title\nApproved\n",
      "oldLabel": "memo.txt",
      "newLabel": "memo.txt",
      "sourceSha256": "a9f5e927daf42ccddfd5b3d32339fc81e8a2542fa4e3034818c1e74c83d93d90",
      "resultSha256": "784e8c6360e6639a1996ceea7e1f0c07d5a81d6b37bd100fc2143774af9b1f19",
      "hunks": [
        {
          "oldStart": 1,
          "oldCount": 2,
          "newStart": 1,
          "newCount": 2,
          "added": 1,
          "removed": 1,
          "context": 1
        }
      ],
      "addedLines": 1,
      "removedLines": 1
    },
    "provenance": {
      "inputSha256": "90c3e1079c87b9e2946db7c3a80a0106c364f3f90dab9ae89143cc4ae1d7b2fd",
      "outputSha256": "46af28a70cd21a1ab902e6cb5af4cd38dc3def274362e3bffdfed748131c181c",
      "deterministic": true,
      "externalRequests": 0
    }
  },
  "requiredHeaders": {
    "Content-Type": "application/json",
    "Idempotency-Key": "random 16–128 character operation identifier"
  },
  "fixedExample": "/reference/examples/unified-diff-apply.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."
  }
}