Compose UTF-8 byte-column records
Write a real fixed-width UTF-8 import artifact from caller-declared byte columns and string records, with explicit ASCII padding, strict overflow rejection and byte offset manifest.
text · Operation ID: fixed-width-records-compose
Choose this operation when
- Explicit UTF-8 byte column layout, ASCII pad characters and exact-key string records
Outside this profile
- Terminal display width, glyph alignment, packed decimals, spreadsheet formatting or named bank/government formats
- Truncation, numeric coercion, parsing fixed-width input or CSV comparison
- Blind transcoding after layout; changing encoding can invalidate UTF-8 byte widths
- Fetching, uploading, sending, writing files, accessing media or changing external state
Exact release references
Static JSON contract · Markdown reference · Fixed example response
Complete input schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"columns": {
"minItems": 1,
"maxItems": 32,
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string",
"minLength": 1,
"maxLength": 128
},
"widthBytes": {
"type": "integer",
"minimum": 1,
"maximum": 256
},
"align": {
"type": "string",
"enum": [
"left",
"right"
]
},
"pad": {
"type": "string",
"pattern": "^[\\x20-\\x7e]$"
}
},
"required": [
"name",
"widthBytes",
"align",
"pad"
],
"additionalProperties": false
}
},
"rows": {
"maxItems": 1000,
"type": "array",
"items": {
"type": "object",
"propertyNames": {
"type": "string"
},
"additionalProperties": {
"type": "string"
}
}
},
"lineEnding": {
"type": "string",
"enum": [
"LF",
"CRLF"
]
},
"finalLineEnding": {
"type": "boolean"
}
},
"required": [
"columns",
"rows",
"lineEnding",
"finalLineEnding"
],
"additionalProperties": false
}
Complete output-envelope schema
{
"type": "object",
"required": [
"operation",
"version",
"result",
"provenance"
],
"properties": {
"operation": {
"const": "fixed-width-records-compose",
"type": "string"
},
"version": {
"const": "0.29.0",
"type": "string"
},
"result": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"text": {
"type": "string",
"maxLength": 100000
},
"byteLength": {
"type": "integer",
"minimum": 0,
"maximum": 100000
},
"recordByteLength": {
"type": "integer",
"minimum": 1,
"maximum": 4096
},
"rowByteOffsets": {
"maxItems": 1000,
"type": "array",
"items": {
"type": "integer",
"minimum": 0,
"maximum": 100000
}
},
"columns": {
"minItems": 1,
"maxItems": 32,
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string",
"minLength": 1,
"maxLength": 128
},
"startByte": {
"type": "integer",
"minimum": 0,
"maximum": 4095
},
"endByte": {
"type": "integer",
"minimum": 1,
"maximum": 4096
}
},
"required": [
"name",
"startByte",
"endByte"
],
"additionalProperties": false
}
}
},
"required": [
"text",
"byteLength",
"recordByteLength",
"rowByteOffsets",
"columns"
],
"additionalProperties": false
},
"provenance": {
"type": "object",
"required": [
"inputSha256",
"outputSha256",
"deterministic",
"externalRequests"
],
"properties": {
"inputSha256": {
"type": "string",
"pattern": "^[a-f0-9]{64}$"
},
"outputSha256": {
"type": "string",
"pattern": "^[a-f0-9]{64}$"
},
"deterministic": {
"const": true
},
"externalRequests": {
"const": 0
}
}
}
},
"additionalProperties": false
}
Fixed example
One accepted fixed example, not a custom-input trial. No operation runs when this static page is requested.
Example input
{
"columns": [
{
"name": "code",
"widthBytes": 4,
"align": "left",
"pad": " "
},
{
"name": "qty",
"widthBytes": 4,
"align": "right",
"pad": "0"
}
],
"rows": [
{
"code": "A",
"qty": "7"
},
{
"code": "BB",
"qty": "42"
}
],
"lineEnding": "CRLF",
"finalLineEnding": true
}
Example response
{
"operation": "fixed-width-records-compose",
"version": "0.29.0",
"result": {
"text": "A 0007\r\nBB 0042\r\n",
"byteLength": 20,
"recordByteLength": 8,
"rowByteOffsets": [
0,
10
],
"columns": [
{
"name": "code",
"startByte": 0,
"endByte": 4
},
{
"name": "qty",
"startByte": 4,
"endByte": 8
}
]
},
"provenance": {
"inputSha256": "6c94e72ed91c6ffdc231e1e577a82ffbc281de0948cc75ebd270a8517d1caa47",
"outputSha256": "7f21c0e660c167d123da9877752f336c268d2984b2657754946d028cc92b45a4",
"deterministic": true,
"externalRequests": 0
}
}
Bounds and precision
JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.
{
"global": {
"requestBytes": 131072,
"responseBytes": 524288,
"jsonDepth": 32,
"jsonNodes": 20000,
"requestsPerMinute": 60,
"paidAttemptsPerMinute": 20,
"idempotencyHours": 24
},
"operation": {
"inputBytes": 100000,
"outputBytes": 400000,
"jsonNodes": 12000,
"depth": 20,
"profile": "utf8-byte-column-records-v1",
"encoding": "UTF-8",
"columns": 32,
"maximumColumnBytes": 256,
"maximumRecordBytes": 4096,
"rows": 1000,
"textOutputBytes": 100000
}
}
Complete schemas, descriptions and cross-field validation may impose additional limits.
Proposed price and protocol definitions
{
"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."
}
Protocol definitions: x402, mpp. MPP uses Tempo charge. Paid MCP execution is unsupported. All runtime readiness is not evaluated in this build.
API path templates, not endpoints on this documentation host
{
"x402": "/v1/x402/fixed-width-records-compose",
"mpp": "/v1/mpp/fixed-width-records-compose"
}
Required headers
{
"Content-Type": "application/json",
"Idempotency-Key": "random 16–128 character operation identifier"
}
Actual SDK challenge amount, asset, network, recipient and wallet costs must pass independent authorization. Preserve identical key, body, protocol and credential on retries; on PAYMENT_UNCERTAIN stop and reconcile.
Execution profile and provider conditions
{
"deterministic": true,
"externalRequests": 0,
"maxExternalRequests": 0,
"resultSnapshotPersisted": false,
"fixedExampleIsIllustrativeSnapshot": false,
"requiresPayment": true,
"supportsMcpExecution": false
}
Deterministic supplied-input operation with no external requests or stored request/result bodies. Payment infrastructure retains payment metadata and hashes.
Failure handling
- HTTP 400: Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch Correct the request before payment
- HTTP 402: Payment challenge or rejected payment Use official protocol SDK; inspect payment outcome before another payment
- HTTP 409: Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay
- HTTP 413: Input or generated output too large Reduce input; no payment attempted for validation failure
- HTTP 415: Unsupported media type or compression Send uncompressed application/json
- HTTP 422: Schema or service-specific semantic validation failure Correct input using returned error code; no payment attempted
- HTTP 429: Request/payment-attempt rate exceeded Wait for rate limit window; preserve existing payment identity
- HTTP 503: Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation
Declared requirements
Before any paid call, refresh the live operation contract and POST the complete bounded budgeted plan to the separate API's /preflight. Unknown requirements block selection; compatible preflight is not permission to spend.