FabTally Utility Belt
REMOTE · BELT.FABTALLY.COM · SCANNED SEP 20
13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.
Available components
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. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage99
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 97% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 13 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the FabTally Utility Belt MCP server?
FabTally Utility Belt is a hosted endpoint at https://belt.fabtally.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · belt.fabtally.com
claude mcp add --transport http zvmzaretsky-utility-belt 'https://belt.fabtally.com/mcp'
{
"mcpServers": {
"zvmzaretsky-utility-belt": {
"url": "https://belt.fabtally.com/mcp"
}
}
} {
"servers": {
"zvmzaretsky-utility-belt": {
"type": "http",
"url": "https://belt.fabtally.com/mcp"
}
}
} [mcp_servers.zvmzaretsky-utility-belt] url = "https://belt.fabtally.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"zvmzaretsky-utility-belt": {
"type": "remote",
"url": "https://belt.fabtally.com/mcp",
"enabled": true
}
}
} openclaw mcp add zvmzaretsky-utility-belt --url 'https://belt.fabtally.com/mcp' --transport streamable-http
mcp_servers:
zvmzaretsky-utility-belt:
url: "https://belt.fabtally.com/mcp" {
"McpServers": {
"zvmzaretsky-utility-belt": {
"Transport": "http",
"Url": "https://belt.fabtally.com/mcp"
}
}
} assistant mcp add zvmzaretsky-utility-belt -t streamable-http -u 'https://belt.fabtally.com/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 31 Aug 26 +1
- Stability: 0.97 → pass security
- 29 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 26 Aug 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 24 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 2 Aug 26 0
- Stability: unverified → 0.03 ▲ functional
- 1 Aug 26 0
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Probed https://belt.fabtally.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=belt.fabtally.com | CN=YR1,O=Let's Encrypt,C=US | 31 Jul 2026 | 29 Oct 2026 | RSA 2048 | SHA256-RSA | 5505e9586deeff102cf9794aef99ce6bfe5 |
| SANs: belt.fabtally.com | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of belt.fabtally.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| fabtally.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://belt.fabtally.com/mcp | Verified | 200 | |
| http (plaintext) | http://belt.fabtally.com/mcp | HTTPS enforced | 301 | https://belt.fabtally.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
convert Unit conversion ~145
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.
| Name | Type | Req | Description |
|---|---|---|---|
| from | string | yes | Source unit, e.g. c, km, GiB, gal, kg. |
| to | string | yes | Target unit in the same dimension. |
| value | number | yes | Numeric value to convert. |
No output schema declared.
No examples provided.
cron Cron -> next N runs + description (paid $0.001) ~209
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.
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | How many upcoming runs (1-100, default 5). |
| expression | string | yes | 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… |
No output schema declared.
No examples provided.
currency Live currency convert (paid $0.001) ~194
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.
| Name | Type | Req | Description |
|---|---|---|---|
| amount | number | yes | Amount in the source currency. |
| from | string | yes | Source ISO-4217 code, e.g. USD. |
| to | string | yes | 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… |
No output schema declared.
No examples provided.
datemath Date math: durations & business days (paid $0.001) ~333
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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… |
No output schema declared.
No examples provided.
diff Text diff (unified + structured) (paid $0.001) ~209
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.
| Name | Type | Req | Description |
|---|---|---|---|
| a | string | yes | Original text. |
| b | string | yes | 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… |
No output schema declared.
No examples provided.
encode Encode / decode (base64, hex, url, html) ~134
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.
| Name | Type | Req | Description |
|---|---|---|---|
| op | string | yes | base64-encode|base64-decode|base64url-encode|base64url-decode|hex-encode|hex-decode|url-encode|url-decode|html-encode|html-decode |
| text | string | yes | Text to encode/decode. |
No output schema declared.
No examples provided.
hash Hash / HMAC ~227
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).
| Name | Type | Req | Description |
|---|---|---|---|
| algorithm | string | yes | 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 | yes | Input to hash. |
No output schema declared.
No examples provided.
id Generate IDs (uuid v4/v7, ULID, nanoid) ~154
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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). |
No output schema declared.
No examples provided.
jsonschema JSON-Schema (2020-12) validate + explain (paid $0.001) ~165
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.
| Name | Type | Req | Description |
|---|---|---|---|
| data | – | – | The value to validate against the schema. |
| schema | object | yes | 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… |
No output schema declared.
No examples provided.
regex Regex test / match / extract / replace (safe) ~182
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).
| Name | Type | Req | Description |
|---|---|---|---|
| flags | string | – | Any of g,i,m,s,u,y. |
| input | string | yes | 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 | yes | The regular expression source (max 2000 chars). |
| replacement | string | – | Replacement string for op='replace' (supports $1 etc.). |
No output schema declared.
No examples provided.
rrule iCal RRULE -> next N occurrences (paid $0.001) ~222
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.
| Name | Type | Req | Description |
|---|---|---|---|
| after | string | – | Return occurrences after this ISO datetime (default now). |
| count | integer | – | How many occurrences (1-366, default 5). |
| rrule | string | yes | 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… |
No output schema declared.
No examples provided.
text Slugify / case-convert / template-fill ~194
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).
| Name | Type | Req | Description |
|---|---|---|---|
| data | object | – | Object of values for op='template'. |
| op | string | yes | 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. |
No output schema declared.
No examples provided.
timezone Timezone / DST convert (paid $0.001) ~250
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.
| Name | Type | Req | Description |
|---|---|---|---|
| datetime | string|number | yes | 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 | yes | 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… |
No output schema declared.
No examples provided.
What is the FabTally Utility Belt MCP server?
FabTally Utility Belt is an MCP server listed in the public MCP registry as io.github.zvmzaretsky/utility-belt. 13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more. This page covers its hosted endpoint (https://belt.fabtally.com/mcp).
Is the FabTally Utility Belt MCP server safe to use?
FabTally Utility Belt scores 77 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the FabTally Utility Belt MCP server expose?
FabTally Utility Belt exposes 13 tools: convert, text, hash, encode, id, and 8 more. Their descriptions and schemas cost roughly 2,618 tokens of context every time the server is loaded.
Does the FabTally Utility Belt MCP server require authentication?
No. We connected to FabTally Utility Belt without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the FabTally Utility Belt MCP server still maintained?
FabTally Utility Belt is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.