Bizday MCP server

Which MCP servers are Bizday's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-28

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Whose server it is

Registry namecom.isitabizday/bizdayverified in the MCP registry

The registry name sits under isitabizday.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-28

Stateanswerschecked 2026-10-28
Tools8
Server calls itselfbizday
Server version0.3.23
Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 494 ms.

Should an agent connect itNot proven either way yet

Its tools do every use case we checked: Count business days between two US dates; Roll a deadline past federal office closures; Check whether a holiday falls on a business day.
Checked on 6 of the 7 days it takes to judge reliability.

Once connected

For "Count business days between two US dates", the likely first call is count_business_days.
For "Roll a deadline past federal office closures", the likely first call is roll_date.
For "Check whether a holiday falls on a business day", the likely first call is is_business_day.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 6, the first on 2026-10-28

INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
What an agent can do with it3 of 3 use cases
Answeredmeasuring6 of the 7 daily checks it takes to print a share
Median first answer505 ms
Space in an agent's context≈ 2,572 tokensthe definitions of all its tools (8), which an agent carries on every turn
Tool definitionsA · 100 of 100
Typed results8 of 8 toolsdeclared outputSchema: results come typed, read once

Every tool passes all six checks.

What an agent can do with it

can do · Count business days between two US dates
can do · Roll a deadline past federal office closures
can do · Check whether a holiday falls on a business day

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers8 tools · read 2026-10-28

list_calendars
Shipped calendars: id, name, source URL, Saturday and Sunday rules, coverage, last verified, and changelog. us-federal-opm is the default. us-nyse covers 2026-01-01 through 2028-12-31. us-sifma covers 2026-01-01 through 2027-12-31. us-ca…
list_holidays
Holiday rows for one year. us-federal-opm and us-fed-banking return the eleven nationwide legal public holidays. On us-fed-banking, observed is null when the legal date is a Saturday, because Friday stays open. us-nyse returns the NYSE…
is_business_day
Whether a civil date is a business day, and why. Omit calendar for us-federal-opm (US federal offices). us-fed-banking is the Federal Reserve Banks schedule: a Saturday holiday does not close the preceding Friday. us-nyse is NYSE full-day…
add_business_days
The date that is days business days after start. The start date is day 0, matching Excel WORKDAY, so days=1 always leaves the start date. days is an integer from -3660 to 3660. Omit calendar for us-federal-opm. us-fed-banking keeps…
count_business_days
How many business days are in the inclusive span from start through end, matching Excel NETWORKDAYS. Negative when end is earlier. The span must be 3660 days or less. Omit calendar for us-federal-opm.
roll_date
Stay on date when it is already a business day. Otherwise move to the nearest business day in direction next or previous. This is not Excel WORKDAY, and it does not decide whether a filing is timely. Omit calendar for us-federal-opm.
frcp_6a_deadline
Count a period stated in days under Fed. R. Civ. P. 6(a)(1). Exclude the trigger day. Count every calendar day, including intermediate Saturdays, Sundays, and legal holidays. Roll only the last day. direction is after or before. days is…
report_discrepancy
Store a suspected wrong closing for later review. Requires calendar, date, claim, and source_url. The report is not applied to either calendar. The result is accepted true and applied false. claim is one line of at most 500 characters…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "bizday": {
      "type": "http",
      "url": "https://isitabizday.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http isitabizday https://isitabizday.com/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://isitabizday.com/mcp as a custom connector in the settings.

Other servers listed as Bizday's

com.isitabizday/hotel-fact-graphanswers, 3 toolsverified in the MCP registry

OpenAPI spec

14 paths, read 2026-10-28. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.