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FabTally Utility Belt

13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.

사용해야 할까요

품질 및 안전성

A
설명 품질
94%
스키마 완전성
98%
이름 품질
80%
오염 위험
80%
권한 일치
100%
프로토콜 준수
100%

발견 사항 (6)

  • HIGHTool poisoning patterns detected
  • MEDIUMTool 'text' description contains placeholder texttext에서
  • LOWTool 'text' description lacks action verbtext에서
  • LOWTool 'encode' description lacks action verbencode에서
  • LOWTool 'id' name length outside 3-30 rangeid에서
  • INFOTool description contains placeholder or incomplete texttext에서

도구 정의와 프로토콜 준수에 대한 자동 분석을 기반으로 합니다.

컨텍스트 비용

~3,374토큰 (도구 정의)
~2.0 KB일반적인 응답 크기
상당한 주의 영향 (128k 컨텍스트의 2.64%)

이는 서버의 도구가 모델의 컨텍스트에 로드될 때마다 소비되는 대략적인 토큰 수입니다. 수치가 높을수록 다른 작업에 사용할 수 있는 주의가 줄어듭니다.

설치

원클릭 설치

`claude_desktop_config.json` 파일에 다음을 추가하세요:

{
  "mcpServers": {
    "utility-belt": {
      "url": "https://belt.fabtally.com/mcp"
    }
  }
}

원격 엔드포인트

https://belt.fabtally.com/mcpstreamable-http

할 수 있는 일

도구 목록

도구 (13)

🟢 읽기 전용🟡 쓰기🔴 삭제⚪ 알 수 없음
⚪convert(value, from, to)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "value": {
      "type": "number",
      "description": "Numeric value to convert."
    },
    "from": {
      "type": "string",
      "description": "Source unit, e.g. c, km, GiB, gal, kg."
    },
    "to": {
      "type": "string",
      "description": "Target unit in the same dimension."
    }
  },
  "required": [
    "value",
    "from",
    "to"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪text(op, text, template, data, separator, ...)

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).

입력 스키마

{
  "type": "object",
  "properties": {
    "op": {
      "type": "string",
      "description": "slugify | template | camel | pascal | snake | kebab | constant | dot | path | title | sentence | upper | lower"
    },
    "text": {
      "type": "string",
      "description": "Input text for slugify/case ops."
    },
    "template": {
      "type": "string",
      "description": "Template string for op='template', with {{key}} placeholders."
    },
    "data": {
      "type": "object",
      "additionalProperties": {},
      "description": "Object of values for op='template'."
    },
    "separator": {
      "type": "string",
      "description": "Slug separator (default '-')."
    },
    "strict": {
      "type": "boolean",
      "description": "template: throw on missing keys."
    }
  },
  "required": [
    "op"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢hash(algorithm, text, input_encoding, output_encoding, hmac_key)

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).

입력 스키마

{
  "type": "object",
  "properties": {
    "algorithm": {
      "type": "string",
      "description": "sha256 | sha512 | sha384 | sha1 | md5 | sha3-256 | keccak256 | ripemd160"
    },
    "text": {
      "type": "string",
      "description": "Input to hash."
    },
    "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."
    },
    "hmac_key": {
      "type": "string",
      "description": "If set, compute HMAC with this key (not for keccak256/sha3-256)."
    }
  },
  "required": [
    "algorithm",
    "text"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪encode(op, text)

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.

입력 스키마

{
  "type": "object",
  "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."
    }
  },
  "required": [
    "op",
    "text"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢id(kind, count, size, bytes)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "kind": {
      "type": "string",
      "description": "uuidv4 (default) | uuidv7 | ulid | nanoid | hex | base64url | int"
    },
    "count": {
      "type": "integer",
      "description": "How many to generate (1-1000, default 1)."
    },
    "size": {
      "type": "integer",
      "description": "nanoid length (default 21)."
    },
    "bytes": {
      "type": "integer",
      "description": "hex/base64url random byte length (default 16)."
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪regex(pattern, input, flags, op, replacement, ...)

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).

입력 스키마

{
  "type": "object",
  "properties": {
    "pattern": {
      "type": "string",
      "description": "The regular expression source (max 2000 chars)."
    },
    "input": {
      "type": "string",
      "description": "The text to run it against (max 200k chars)."
    },
    "flags": {
      "type": "string",
      "description": "Any of g,i,m,s,u,y."
    },
    "op": {
      "type": "string",
      "description": "test | match | extract (capture groups) | replace. Default match."
    },
    "replacement": {
      "type": "string",
      "description": "Replacement string for op='replace' (supports $1 etc.)."
    },
    "limit": {
      "type": "integer",
      "description": "Max matches for global ops (default 1000)."
    }
  },
  "required": [
    "pattern",
    "input"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪timezone(datetime, from_zone, to_zone, x_payment)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "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."
    },
    "to_zone": {
      "type": "string",
      "description": "Target IANA zone, e.g. Europe/London, Asia/Tokyo."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "datetime",
    "to_zone"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢cron(expression, timezone, count, from, x_payment)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "expression": {
      "type": "string",
      "description": "Cron expression, e.g. '0 9 * * 1-5'."
    },
    "timezone": {
      "type": "string",
      "description": "IANA timezone (default UTC)."
    },
    "count": {
      "type": "integer",
      "description": "How many upcoming runs (1-100, default 5)."
    },
    "from": {
      "type": "string",
      "description": "Compute runs after this ISO datetime (default now)."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "expression"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢rrule(rrule, after, count, timezone, x_payment)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "rrule": {
      "type": "string",
      "description": "RRULE string, optionally with a DTSTART line."
    },
    "after": {
      "type": "string",
      "description": "Return occurrences after this ISO datetime (default now)."
    },
    "count": {
      "type": "integer",
      "description": "How many occurrences (1-366, default 5)."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "rrule"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪currency(amount, from, to, x_payment)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "amount": {
      "type": "number",
      "description": "Amount in the source currency."
    },
    "from": {
      "type": "string",
      "description": "Source ISO-4217 code, e.g. USD."
    },
    "to": {
      "type": "string",
      "description": "Target ISO-4217 code, e.g. EUR."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "amount",
    "from",
    "to"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢diff(a, b, mode, context, label_a, ...)

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.

입력 스키마

{
  "type": "object",
  "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "a",
    "b"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢jsonschema(schema, data, x_payment)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "schema": {
      "type": "object",
      "additionalProperties": {},
      "description": "A JSON Schema (draft 2020-12) object."
    },
    "data": {
      "description": "The value to validate against the schema."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "schema"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟡datemath(op, date, duration, from, to, ...)

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.

입력 스키마

{
  "type": "object",
  "properties": {
    "op": {
      "type": "string",
      "description": "add | subtract | diff | business-add | business-diff"
    },
    "date": {
      "type": "string",
      "description": "Base date for add/subtract/business-add (ISO 8601)."
    },
    "duration": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object",
          "additionalProperties": {}
        }
      ],
      "description": "ISO-8601 duration string or object for add/subtract."
    },
    "from": {
      "type": "string",
      "description": "Start datetime for diff/business-diff."
    },
    "to": {
      "type": "string",
      "description": "End datetime for diff/business-diff."
    },
    "units": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      ],
      "description": "diff units, e.g. ['days','hours']."
    },
    "days": {
      "type": "integer",
      "description": "Business days to add (business-add; may be negative)."
    },
    "holidays": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "ISO dates to skip as holidays."
    },
    "weekend": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "Weekend weekdays (1=Mon..7=Sun; default [6,7])."
    },
    "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 $0.001 call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "op"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

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