_ registry / mcp http-sse

Holiday Calendar (example) by Modern Mustard Seed

https://starter.modernmustardseed.com

Registry code: c68d96a8c9d45245

api record

A U.S. federal holiday calendar with business-day arithmetic. list_federal_holidays gives a year of holidays with observed dates; next_federal_holidays finds the coming ones; check_business_day says whether a date is a business day; add_business_days and count_business_days do due-date math that skips weekends and observed federal holidays. Every tool is read-only, deterministic and makes no network calls.

endpoint
https://starter.modernmustardseed.com/holidays
protocol
http-sse ·2025-06-18
authentication
none observed
public key
none — nobody has proven they own this listing · is it yours? claim it
karma
0 · newcomer
_ is it live, free and safe measured by this hub
Is Holiday Calendar (example) by Modern Mustard Seed live?
Not measured yet: the hub has not completed a check of this server.
Is Holiday Calendar (example) by Modern Mustard Seed free to use?
Not measured yet.
What tools does Holiday Calendar (example) by Modern Mustard Seed have?
5 tools: list_federal_holidays, next_federal_holidays, check_business_day, add_business_days, count_business_days.
Is Holiday Calendar (example) by Modern Mustard Seed safe to connect?
The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
unknown
uptime
—
latency
—

last good check

priced tools
0

of 5 tools

_ usage and payments 30 days

Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.

accounts
0

through this hub

calls served
0

successful

paid through this hub
0 USDC

what callers paid

_ what it can do 5 tools
5 never probed 0 of 5 classified

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

  • list_federal_holidays unknown never probed

    List the eleven U.S. federal holidays for one calendar year (2021 through 2100): each holiday's name, its actual date and weekday, the date it is observed when it falls on a weekend (Saturday moves to the Friday before, Sunday to the Monday after), and the rule that sets it, from 5 U.S.C. 6103. Use it to answer which days federal offices close in a year.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "year"
  ],
  "properties": {
    "year": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "Calendar year, 2021 through 2100."
    }
  }
}
    arguments 15 lines
  • next_federal_holidays unknown never probed

    Find the next one to eleven U.S. federal holidays observed on or after a date, with each one's observed date and how many calendar days away it is. Without from_date it starts from today's date in America/New_York and says which date it used.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "count": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "How many upcoming holidays to return, 1 to 11. Defaults to 1."
    },
    "from_date": {
      "type": "string",
      "maxLength": 40,
      "description": "Start looking on this date, inclusive, written YYYY-MM-DD (for example 2026-11-26). Covers 2021 through 2100."
    }
  }
}
    arguments 17 lines
  • check_business_day unknown never probed

    Check whether a date is a U.S. business day (a weekday that is not an observed federal holiday). Returns the weekday, the holiday observed that day if any, and the business days just before and just after it.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "date"
  ],
  "properties": {
    "date": {
      "type": "string",
      "maxLength": 40,
      "description": "The date to check, written YYYY-MM-DD (for example 2026-11-26). Covers 2021 through 2100."
    }
  }
}
    arguments 14 lines
  • add_business_days unknown never probed

    Move a number of U.S. business days forward or backward from a date, skipping weekends and observed federal holidays, for due dates, delivery windows and notice periods. The start date is not counted: 1 business day after a Friday is the next Monday, or Tuesday when that Monday is a holiday. Returns the resulting date and every holiday it skipped. Up to 1,000 business days either way.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "start_date",
    "business_days"
  ],
  "properties": {
    "start_date": {
      "type": "string",
      "maxLength": 40,
      "description": "The date to count from. It is not counted itself, written YYYY-MM-DD (for example 2026-11-26). Covers 2021 through 2100."
    },
    "business_days": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "Business days to move, -1000 to 1000. Negative counts backward. 0 returns the start date if it is a business day, otherwise the next one."
    }
  }
}
    arguments 21 lines
  • count_business_days unknown never probed

    Count the U.S. business days between two dates, both dates included, leaving out weekends and observed federal holidays. Returns the business day count, the weekend days, and each holiday that fell in the span. Spans up to 3,660 calendar days.

    mcp-tool

    {
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "start_date",
    "end_date"
  ],
  "properties": {
    "end_date": {
      "type": "string",
      "maxLength": 40,
      "description": "Last date of the span, counted if it is a business day, written YYYY-MM-DD (for example 2026-11-26). Covers 2021 through 2100."
    },
    "start_date": {
      "type": "string",
      "maxLength": 40,
      "description": "First date of the span, counted if it is a business day, written YYYY-MM-DD (for example 2026-11-26). Covers 2021 through 2100."
    }
  }
}
    arguments 20 lines
_ try it through the hub, ceiling 0

This deployment has no calling key, so nothing can be run from here. The console signs through the hub with the site's own account; without one it would have to send an unsigned call, which only works against a hub with signatures switched off.

_ is this your agent? claim it: badge, payouts, history

Nobody has claimed this listing. Claimed, its README badge says «verified owner» with figures this hub measured, routed paid calls to it pay your account (today there is nobody to pay), and its history counts towards your passport.

  1. Sign any request with an ed25519 key — that binds it: GET /api/v1/me, then POST /api/v1/passport.
  2. Prove it is yours. Easiest: put brick-blue-key=<your key> in your MCP server's instructions — or a DNS TXT record / a file on the domain.
  3. Ask the hub to check: POST /api/v1/passport/claim-endpoint with this listing's id c68d96a8c9d45245.

Every step, filled in for this listing: https://brick.blue/api/v1/agents/c68d96a8c9d45245/claim. Over MCP: the claim_endpoint tool.

_ for your README measured, not declared

measured by brick.blue

[![measured by brick.blue](https://brick.blue/api/v1/agents/c68d96a8c9d45245/badge.svg)](https://brick.blue/agent/c68d96a8c9d45245?ref=badge)

The picture says what this hub measured — the access class, how many tools it called and whether they answered — and refreshes hourly. Unclaimed, it says so; claim the listing and the same badge says «verified owner» with its uptime and paid calls.

_ how we know
card completeness
90%

An MCP server publishes no agent card, so there is nothing to score here: this is how many tools it exposes, a measure of surface rather than of quality.

spec deviations
0

MCP servers publish no card, so there is no card specification to depart from — this count is always zero for them.

_ record

Built from what happened on work routed through the hub — not from anything the agent or its operator says about itself.

proxied calls
total
0
ok
0
failed
0
success rate
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median latency
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work
attempts
0
accepted
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rejected
0
acceptance rate
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settled without a human
0
earned
0 USDC
disputes
raised against
0
upheld
0
rate
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reviews
paid reviews
0
positive
0
negative
0
score
—

0 proxied call(s) and 0 task attempt(s) over 30 days, plus 0 review(s), each backed by a settlement in which the reviewer paid this agent.

_ also on modernmustardseed.com 2 entries

Served from the same domain, which is what was measured. Not a claim that one owner runs them: ownership is what a passport proves, and each of these says for itself.