Servidor MCP
FabTally Utility Belt
io.github.zvmzaretsky/utility-belt
Qué hace este MCP
Offers deterministic utilities for unit conversion, date and recurrence calculations, encoding, hashing, IDs, regex, text transformation, and schema validation.
Capacidades
Herramientas
13
herramientas
convert
Unit conversion
FREE. Convert a value between units in the same dimension: length, mass, temperature, volume, data, time, area, speed, angle, pressure, energy. Deterministic. Args: value (number), from (unit), to (unit). e.g. {value:100, from:'c', to:'f'} or {value:1, from:'GiB', to:'MB'}. Different-dimension conversions 400.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['value', 'from', 'to'], 'properties': {'to': {'type': 'string', 'description': 'Target unit in the same dimension.'}, 'from': {'type': 'string', 'description': 'Source unit, e.g. c, km, GiB, gal, kg.'}, 'value': {'type': 'number', 'description': 'Numeric value to convert.'}}, 'additionalProperties': False}
cron
Cron -> next N runs + description (paid $0.001)
PAID $0.001. Parse a 5- or 6-field cron expression and return the next N run times plus a plain-English description. Args: expression, timezone (IANA, default UTC), count (default 5), from (ISO, optional). Without payment returns the x402 challenge; pass x_payment to settle.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['expression'], 'properties': {'from': {'type': 'string', 'description': 'Compute runs after this ISO datetime (default now).'}, 'count': {'type': 'integer', 'description': 'How many upcoming runs (1-100, default 5).'}, 'timezone': {'type': 'string', 'description': 'IANA timezone (default UTC).'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}, 'expression': {'type': 'string', 'description': "Cron expression, e.g. '0 9 * * 1-5'."}}, 'additionalProperties': False}
currency
Live currency convert (paid $0.001)
PAID $0.001. Convert an amount between currencies at reference/mid-market rates from a keyless public central-bank feed (ECB), cached. Informational, not a dealable quote. Args: amount, from, to (ISO-4217, e.g. USD, EUR, JPY). Without payment returns the x402 challenge; pass x_payment to settle.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['amount', 'from', 'to'], 'properties': {'to': {'type': 'string', 'description': 'Target ISO-4217 code, e.g. EUR.'}, 'from': {'type': 'string', 'description': 'Source ISO-4217 code, e.g. USD.'}, 'amount': {'type': 'number', 'description': 'Amount in the source currency.'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
datemath
Date math: durations & business days (paid $0.001)
PAID $0.001. Calendar date math. op='add'/'subtract' an ISO-8601 duration (P1Y2M10DT2H30M) to a date; op='diff' two datetimes into chosen units; op='business-add' add business days (configurable weekend + holidays); op='business-diff' count business days between two dates. Without payment returns the x402 challenge; pass x_payment to settle.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['op'], 'properties': {'op': {'type': 'string', 'description': 'add | subtract | diff | business-add | business-diff'}, 'to': {'type': 'string', 'description': 'End datetime for diff/business-diff.'}, 'date': {'type': 'string', 'description': 'Base date for add/subtract/business-add (ISO 8601).'}, 'days': {'type': 'integer', 'description': 'Business days to add (business-add; may be negative).'}, 'from': {'type': 'string', 'description': 'Start datetime for diff/business-diff.'}, 'units': {'anyOf': [{'type': 'string'}, {'type': 'array', 'items': {'type': 'string'}}], 'description': "diff units, e.g. ['days','hours']."}, 'weekend': {'type': 'array', 'items': {'type': 'number'}, 'description': 'Weekend weekdays (1=Mon..7=Sun; default [6,7]).'}, 'duration': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': {}}], 'description': 'ISO-8601 duration string or object for add/subtract.'}, 'holidays': {'type': 'array', 'items': {'type': 'string'}, 'description': 'ISO dates to skip as holidays.'}, 'timezone': {'type': 'string', 'description': 'IANA zone for parsing/rendering.'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
diff
Text diff (unified + structured) (paid $0.001)
PAID $0.001. Diff two texts: a unified patch, a structured op-list (add/remove/equal), and add/remove/hunk stats. Args: a, b, mode (lines|words|chars, default lines), context (default 3), label_a, label_b. Without payment returns the x402 challenge; pass x_payment to settle.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['a', 'b'], 'properties': {'a': {'type': 'string', 'description': 'Original text.'}, 'b': {'type': 'string', 'description': 'Changed text.'}, 'mode': {'type': 'string', 'description': 'lines (default) | words | chars.'}, 'context': {'type': 'integer', 'description': 'Unified-diff context lines (default 3).'}, 'label_a': {'type': 'string'}, 'label_b': {'type': 'string'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
encode
Encode / decode (base64, hex, url, html)
FREE. Encode or decode text. op is one of base64-encode|base64-decode|base64url-encode|base64url-decode|hex-encode|hex-decode|url-encode|url-decode|html-encode|html-decode. Args: op, text.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['op', 'text'], 'properties': {'op': {'type': 'string', 'description': 'base64-encode|base64-decode|base64url-encode|base64url-decode|hex-encode|hex-decode|url-encode|url-decode|html-encode|html-decode'}, 'text': {'type': 'string', 'description': 'Text to encode/decode.'}}, 'additionalProperties': False}
hash
Hash / HMAC
FREE. Compute a cryptographic digest: sha256, sha512, sha384, sha1, md5, sha3-256, keccak256, ripemd160. Optional HMAC via hmac_key. Output hex (default), base64, or base64url. keccak256 also returns a 0x-form (handy for Ethereum). Args: algorithm, text (+ input_encoding utf8|hex|base64, output_encoding, hmac_key).
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['algorithm', 'text'], 'properties': {'text': {'type': 'string', 'description': 'Input to hash.'}, 'hmac_key': {'type': 'string', 'description': 'If set, compute HMAC with this key (not for keccak256/sha3-256).'}, 'algorithm': {'type': 'string', 'description': 'sha256 | sha512 | sha384 | sha1 | md5 | sha3-256 | keccak256 | ripemd160'}, 'input_encoding': {'type': 'string', 'description': 'How `text` is encoded: utf8 (default) | hex | base64 | base64url.'}, 'output_encoding': {'type': 'string', 'description': 'Digest encoding: hex (default) | base64 | base64url.'}}, 'additionalProperties': False}
id
Generate IDs (uuid v4/v7, ULID, nanoid)
FREE. Generate identifiers. kind is one of uuidv4|uuidv7|ulid|nanoid|hex|base64url|int. count up to 1000. nanoid takes `size`; hex/base64url take `bytes`. Uses a CSPRNG. Args: kind, count.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'properties': {'kind': {'type': 'string', 'description': 'uuidv4 (default) | uuidv7 | ulid | nanoid | hex | base64url | int'}, 'size': {'type': 'integer', 'description': 'nanoid length (default 21).'}, 'bytes': {'type': 'integer', 'description': 'hex/base64url random byte length (default 16).'}, 'count': {'type': 'integer', 'description': 'How many to generate (1-1000, default 1).'}}, 'additionalProperties': False}
jsonschema
JSON-Schema (2020-12) validate + explain (paid $0.001)
PAID $0.001. Validate a value against a JSON Schema (draft 2020-12) and explain every error in plain English (which property, what was wrong, allowed values). Args: schema (object), data (any). Without payment returns the x402 challenge; pass x_payment to settle.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['schema'], 'properties': {'data': {'description': 'The value to validate against the schema.'}, 'schema': {'type': 'object', 'description': 'A JSON Schema (draft 2020-12) object.', 'additionalProperties': {}}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
regex
Regex test / match / extract / replace (safe)
FREE. Run a regular expression against input with catastrophic-backtracking protection (it runs in a killable worker with a hard timeout, so a pathological pattern returns a 400 instead of hanging). op is test|match|extract|replace. Args: pattern, input, flags (gimsuy), op, replacement (for replace).
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['pattern', 'input'], 'properties': {'op': {'type': 'string', 'description': 'test | match | extract (capture groups) | replace. Default match.'}, 'flags': {'type': 'string', 'description': 'Any of g,i,m,s,u,y.'}, 'input': {'type': 'string', 'description': 'The text to run it against (max 200k chars).'}, 'limit': {'type': 'integer', 'description': 'Max matches for global ops (default 1000).'}, 'pattern': {'type': 'string', 'description': 'The regular expression source (max 2000 chars).'}, 'replacement': {'type': 'string', 'description': "Replacement string for op='replace' (supports $1 etc.)."}}, 'additionalProperties': False}
rrule
iCal RRULE -> next N occurrences (paid $0.001)
PAID $0.001. Expand an iCal RRULE (RFC 5545) recurrence into its next N occurrences. Args: rrule (e.g. 'FREQ=WEEKLY;BYDAY=MO,WE;COUNT=10'), after (ISO, default now), count (default 5), timezone. Tip: include DTSTART for anchored series. Without payment returns the x402 challenge; pass x_payment.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['rrule'], 'properties': {'after': {'type': 'string', 'description': 'Return occurrences after this ISO datetime (default now).'}, 'count': {'type': 'integer', 'description': 'How many occurrences (1-366, default 5).'}, 'rrule': {'type': 'string', 'description': 'RRULE string, optionally with a DTSTART line.'}, 'timezone': {'type': 'string', 'description': 'Render occurrences in this IANA zone.'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
text
Slugify / case-convert / template-fill
FREE. Text transforms. op='slugify' -> URL slug; op is one of camel|pascal|snake|kebab|constant|dot|path|title|sentence|upper|lower for case conversion; op='template' fills {{placeholders}} from `data`. Args: op, text (for slugify/case), or template + data (for template).
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['op'], 'properties': {'op': {'type': 'string', 'description': 'slugify | template | camel | pascal | snake | kebab | constant | dot | path | title | sentence | upper | lower'}, 'data': {'type': 'object', 'description': "Object of values for op='template'.", 'additionalProperties': {}}, 'text': {'type': 'string', 'description': 'Input text for slugify/case ops.'}, 'strict': {'type': 'boolean', 'description': 'template: throw on missing keys.'}, 'template': {'type': 'string', 'description': "Template string for op='template', with {{key}} placeholders."}, 'separator': {'type': 'string', 'description': "Slug separator (default '-')."}}, 'additionalProperties': False}
timezone
Timezone / DST convert (paid $0.001)
PAID $0.001 (x402, USDC on Base). Convert an instant between IANA time zones with historically-correct DST. Returns converted datetime, UTC offsets, tz abbreviations, DST flags, and the offset difference. Args: datetime (ISO 8601 or epoch), from_zone, to_zone. Without payment returns the x402 challenge; pass x_payment to settle. Free teaser exists on the HTTP API at /v1/timezone/free.
Esquema de entrada
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['datetime', 'to_zone'], 'properties': {'to_zone': {'type': 'string', 'description': 'Target IANA zone, e.g. Europe/London, Asia/Tokyo.'}, 'datetime': {'type': ['string', 'number'], 'description': 'Instant to convert: ISO 8601 (e.g. 2021-03-14T01:30:00) or epoch seconds/millis.'}, 'from_zone': {'type': 'string', 'description': 'Source IANA zone (default UTC), e.g. America/New_York.'}, 'x_payment': {'type': 'string', 'description': 'x402 payment payload (base64) for this PAID tool. If supplied it is forwarded as the X-PAYMENT header to settle the $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first.'}}, 'additionalProperties': False}
Historial
Cambios recientes en herramientas
Añadido
datemath
17 de September de 2026 a las 12:53
Añadido
jsonschema
17 de September de 2026 a las 12:53
Añadido
diff
17 de September de 2026 a las 12:53
Añadido
currency
17 de September de 2026 a las 12:53
Añadido
rrule
17 de September de 2026 a las 12:53
Añadido
cron
17 de September de 2026 a las 12:53
Añadido
timezone
17 de September de 2026 a las 12:53
Añadido
regex
17 de September de 2026 a las 12:53
Añadido
id
17 de September de 2026 a las 12:53
Añadido
encode
17 de September de 2026 a las 12:53
Añadido
hash
17 de September de 2026 a las 12:53
Añadido
text
17 de September de 2026 a las 12:53
Añadido
convert
17 de September de 2026 a las 12:53
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