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WebRef (paid)

by webref.johnaio281.workers.dev · remote · no sign-in to list tools · v1.4.0 · published by dev.workers.johnaio281.webref

Web standards and time reference for agents: HTTP codes, retries, deadlines. Paid via x402.

Final · 2Changes · 6
CompareRegistry entry

14 tools: 2 do something that can't be undone, 6 change things and 6 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http webref https://webref.johnaio281.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

14 tools

Can't be undone 2Claude Code: ask
  • convert_durationConvert a duration between units and get it in plain language.No findings

    Why it is in this group

    • The name "convert_duration" says "convert": a word for a change.
    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Convert a duration between units and get it in plain language. Use it to express a timeout in the unit the caller asked for, or to check whether a limit is seconds, minutes or milliseconds. ($0.003 per call)
  • time_untilHow much time is between two instants: the direction, the total in every unit, and a day/hour/minute/second breakdown.No findings

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    How much time is between two instants: the direction, the total in every unit, and a day/hour/minute/second breakdown. Use it to compute a retry delay, a rate-limit reset, or whether a deadline has passed. ($0.003 per call)
Changes things 6Claude Code: ask
  • add_durationAdd a duration to an instant and get the result, in UTC and in Tehran local time.No findings

    Why it is in this group

    • The name "add_duration" says "add": a word for a change.
    Description, as the server wrote it
    Add a duration to an instant and get the result, in UTC and in Tehran local time. Use it for a TTL, a lock expiry, or a token lifetime. ($0.003 per call)
  • content_type_adviceCheck whether a Content-Type header matches what an endpoint kind expects, and say what to send instead when it does not.No findings

    Why it is in this group

    • The name "content_type_advice" says "type": a word for a change.
    Description, as the server wrote it
    Check whether a Content-Type header matches what an endpoint kind expects, and say what to send instead when it does not. ($0.003 per call)
  • mime_typeLook up a MIME type by full type or by file extension: the top-level type, what it is for, and the usual file extension.No findings

    Why it is in this group

    • The name "mime_type" says "type": a word for a change.
    Description, as the server wrote it
    Look up a MIME type by full type or by file extension: the top-level type, what it is for, and the usual file extension. ($0.003 per call)
  • retry_adviceDecide how a client should react to a status code: retry with backoff, check the outcome before retrying, or do not retry.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Decide how a client should react to a status code: retry with backoff, check the outcome before retrying, or do not retry. Includes a suggested backoff schedule. ($0.005 per call)
  • unix_timeConvert between a date and a Unix timestamp, in either direction.No findings

    Why it is in this group

    • The description's first verb is "convert": a word for a change.
    Description, as the server wrote it
    Convert between a date and a Unix timestamp, in either direction. Use it when a payload carries one and the other is needed. ($0.003 per call)
  • weekday_ofWhich day of the week a date falls on, and whether it is a business day.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Which day of the week a date falls on, and whether it is a business day. Use it before scheduling work or setting a deadline that lands on a weekend. ($0.003 per call)
Only reads 6Claude Code: allow
  • business_days_betweenCount the business days between two dates, excluding weekends.No findings

    Why it is in this group

    • The description's first verb is "count": a word for reading.
    Description, as the server wrote it
    Count the business days between two dates, excluding weekends. Use it to turn a calendar deadline into a working-day deadline. Public holidays are not excluded, so the count is an upper bound. ($0.005 per call)
  • describe_instantDescribe an instant: its date, weekday and time in UTC and in Tehran local time (UTC+03:30), plus the Unix timestamp.No findings

    Why it is in this group

    • The name "describe_instant" says "describe": a word for reading.
    Description, as the server wrote it
    Describe an instant: its date, weekday and time in UTC and in Tehran local time (UTC+03:30), plus the Unix timestamp. Use it when a response carries a timestamp and the local date matters. ($0.003 per call)
  • http_methodDescribe an HTTP method: whether it is safe, whether it is idempotent, whether it carries a body, and what it is for.No findings

    Why it is in this group

    • The description's first verb is "describe": a word for reading.
    Description, as the server wrote it
    Describe an HTTP method: whether it is safe, whether it is idempotent, whether it carries a body, and what it is for. ($0.003 per call)
  • http_statusLook up an HTTP status code: what it means, what the client must do, whether it is retryable, whether it is safe to replay, the defining RFC and the common causes.No findings

    Why it is in this group

    • The name "http_status" says "status": a word for reading.
    Description, as the server wrote it
    Look up an HTTP status code: what it means, what the client must do, whether it is retryable, whether it is safe to replay, the defining RFC and the common causes. ($0.003 per call)
  • list_mime_typesList or search MIME types by top-level type or by keyword, for example image types or anything to do with calendars.No findings

    Why it is in this group

    • The name "list_mime_types" says "list": a word for reading.
    Description, as the server wrote it
    List or search MIME types by top-level type or by keyword, for example image types or anything to do with calendars. ($0.003 per call)
  • status_for_situationFind the HTTP status code that matches a described situation, when the code is not known in advance — for example 'the caller is being rate limited' or 'upstream returned garbage'.No findings

    Why it is in this group

    • The name "status_for_situation" says "status": a word for reading.
    Description, as the server wrote it
    Find the HTTP status code that matches a described situation, when the code is not known in advance — for example 'the caller is being rate limited' or 'upstream returned garbage'. ($0.005 per call)

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.4.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http webref https://webref.johnaio281.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__webref__http_status",
      "mcp__webref__status_for_situation",
      "mcp__webref__list_mime_types",
      "mcp__webref__http_method",
      "mcp__webref__describe_instant",
      "mcp__webref__business_days_between"
    ],
    "ask": [
      "mcp__webref__retry_advice",
      "mcp__webref__mime_type",
      "mcp__webref__content_type_advice",
      "mcp__webref__time_until",
      "mcp__webref__weekday_of",
      "mcp__webref__add_duration",
      "mcp__webref__convert_duration",
      "mcp__webref__unix_time"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as webref. Review it before you use it.