# FabTally Utility Belt (remote · belt.fabtally.com)

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

- Trust score: 60/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `belt.fabtally.com`: 60/100 (this document), [markdown](https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt.md), [page](https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt)

## Channel facts

- Endpoint: `https://belt.fabtally.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 13 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 58/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 2618 tokens (~201/item across 13 items; 13 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 99/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 97% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http zvmzaretsky-utility-belt https://belt.fabtally.com/mcp
```

### Codex

```toml
[mcp_servers.zvmzaretsky-utility-belt]
url = "https://belt.fabtally.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "zvmzaretsky-utility-belt": {
      "type": "remote",
      "url": "https://belt.fabtally.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add zvmzaretsky-utility-belt --url https://belt.fabtally.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  zvmzaretsky-utility-belt:
    url: "https://belt.fabtally.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "zvmzaretsky-utility-belt": {
      "type": "http",
      "url": "https://belt.fabtally.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 60, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-01 (score 59)

First indexed and scored.

## MCP tools (13)

### `convert` (~145 tokens)

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.

Input parameters:

- `from` (string, required): Source unit, e.g. c, km, GiB, gal, kg.
- `to` (string, required): Target unit in the same dimension.
- `value` (number, required): Numeric value to convert.

### `text` (~194 tokens)

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).

Input parameters:

- `data` (object): Object of values for op='template'.
- `op` (string, required): slugify | template | camel | pascal | snake | kebab | constant | dot | path | title | sentence | upper | lower
- `separator` (string): Slug separator (default '-').
- `strict` (boolean): template: throw on missing keys.
- `template` (string): Template string for op='template', with {{key}} placeholders.
- `text` (string): Input text for slugify/case ops.

### `hash` (~227 tokens)

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).

Input parameters:

- `algorithm` (string, required): sha256 | sha512 | sha384 | sha1 | md5 | sha3-256 | keccak256 | ripemd160
- `hmac_key` (string): If set, compute HMAC with this key (not for keccak256/sha3-256).
- `input_encoding` (string): How `text` is encoded: utf8 (default) | hex | base64 | base64url.
- `output_encoding` (string): Digest encoding: hex (default) | base64 | base64url.
- `text` (string, required): Input to hash.

### `encode` (~134 tokens)

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.

Input parameters:

- `op` (string, required): base64-encode|base64-decode|base64url-encode|base64url-decode|hex-encode|hex-decode|url-encode|url-decode|html-encode|html-decode
- `text` (string, required): Text to encode/decode.

### `id` (~154 tokens)

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.

Input parameters:

- `bytes` (integer): hex/base64url random byte length (default 16).
- `count` (integer): How many to generate (1-1000, default 1).
- `kind` (string): uuidv4 (default) | uuidv7 | ulid | nanoid | hex | base64url | int
- `size` (integer): nanoid length (default 21).

### `regex` (~182 tokens)

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).

Input parameters:

- `flags` (string): Any of g,i,m,s,u,y.
- `input` (string, required): The text to run it against (max 200k chars).
- `limit` (integer): Max matches for global ops (default 1000).
- `op` (string): test | match | extract (capture groups) | replace. Default match.
- `pattern` (string, required): The regular expression source (max 2000 chars).
- `replacement` (string): Replacement string for op='replace' (supports $1 etc.).

### `timezone` (~250 tokens)

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.

Input parameters:

- `datetime` (string|number, required): Instant to convert: ISO 8601 (e.g. 2021-03-14T01:30:00) or epoch seconds/millis.
- `from_zone` (string): Source IANA zone (default UTC), e.g. America/New_York.
- `to_zone` (string, required): Target IANA zone, e.g. Europe/London, Asia/Tokyo.
- `x_payment` (string): 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…

### `cron` (~209 tokens)

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.

Input parameters:

- `count` (integer): How many upcoming runs (1-100, default 5).
- `expression` (string, required): Cron expression, e.g. '0 9 * * 1-5'.
- `from` (string): Compute runs after this ISO datetime (default now).
- `timezone` (string): IANA timezone (default UTC).
- `x_payment` (string): 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…

### `rrule` (~222 tokens)

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.

Input parameters:

- `after` (string): Return occurrences after this ISO datetime (default now).
- `count` (integer): How many occurrences (1-366, default 5).
- `rrule` (string, required): RRULE string, optionally with a DTSTART line.
- `timezone` (string): Render occurrences in this IANA zone.
- `x_payment` (string): 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…

### `currency` (~194 tokens)

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.

Input parameters:

- `amount` (number, required): Amount in the source currency.
- `from` (string, required): Source ISO-4217 code, e.g. USD.
- `to` (string, required): Target ISO-4217 code, e.g. EUR.
- `x_payment` (string): 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…

### `diff` (~209 tokens)

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.

Input parameters:

- `a` (string, required): Original text.
- `b` (string, required): Changed text.
- `context` (integer): Unified-diff context lines (default 3).
- `label_a` (string)
- `label_b` (string)
- `mode` (string): lines (default) | words | chars.
- `x_payment` (string): 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…

### `jsonschema` (~165 tokens)

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.

Input parameters:

- `data`: The value to validate against the schema.
- `schema` (object, required): A JSON Schema (draft 2020-12) object.
- `x_payment` (string): 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…

### `datemath` (~333 tokens)

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.

Input parameters:

- `date` (string): Base date for add/subtract/business-add (ISO 8601).
- `days` (integer): Business days to add (business-add; may be negative).
- `duration`: ISO-8601 duration string or object for add/subtract.
- `from` (string): Start datetime for diff/business-diff.
- `holidays` (array): ISO dates to skip as holidays.
- `op` (string, required): add | subtract | diff | business-add | business-diff
- `timezone` (string): IANA zone for parsing/rendering.
- `to` (string): End datetime for diff/business-diff.
- `units`: diff units, e.g. ['days','hours'].
- `weekend` (array): Weekend weekdays (1=Mon..7=Sun; default [6,7]).
- `x_payment` (string): 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…

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt#diagnostics

## Score history

- 2026-08-03: 60
- 2026-08-02: 60
- 2026-08-01: 59

## Links

- Remote endpoint: https://belt.fabtally.com/mcp
- Repository: https://github.com/zvmzaretsky/fabtally-belt-mcp
- Website: https://belt.fabtally.com/
- Changelog RSS feed: https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt/changelog.json
- HTML version of this page: https://verifymcp.io/servers/zvmzaretsky-utility-belt/belt