Connect the federal deadline calculators to your AI assistant

Ask an assistant when your answer to interrogatories is due and it will give you a date. Whether that date adds the 3 days for mail service before or after the weekend roll, whether it treats an observed Friday as a legal holiday, and which rule it rests on, it usually does not say. This connector hands your assistant the same rules engine behind every calculator on this site, so the date arrives with the rule quoted and the open questions attached.

The address

Add this URL to any client that speaks the Model Context Protocol. It is free, it needs no account, and there is nothing to sign up for.

https://federalcourtdeadlines.com/api/mcp

No authentication, no key, and no account. It is an open protocol endpoint rather than a feature of any one assistant, so the same address works in all of them.

Where it goes, per assistant

The URL is the same everywhere and the paste is not: some clients read a JSON file, some have a settings form, and the ones with files disagree about the key names. Here is the exact block for each.

{
  "mcpServers": {
    "federalcourtdeadlines": {
      "type": "http",
      "url": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

name: federalcourtdeadlines
version: 1.0.0
schema: v1
mcpServers:
  - name: federalcourtdeadlines
    type: streamableHttp
    url: https://federalcourtdeadlines.com/api/mcp

{
  "mcpServers": {
    "federalcourtdeadlines": {
      "type": "http",
      "url": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

{
  "mcpServers": {
    "federalcourtdeadlines": {
      "httpUrl": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

{
  "servers": {
    "federalcourtdeadlines": {
      "type": "http",
      "url": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

{
  "mcpServers": {
    "federalcourtdeadlines": {
      "serverUrl": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

{
  "context_servers": {
    "federalcourtdeadlines": {
      "source": "custom",
      "url": "https://federalcourtdeadlines.com/api/mcp"
    }
  }
}

A client that is not on this list almost certainly reads the first shape in that table. All of these files, ready to drop in, are in one small zip.

What it can answer

3 tools. Your assistant picks the right one from the question you asked.

• Federal civil deadline for one rule (federal_deadline). Compute one federal civil deadline under the Federal Rules of Civil Procedure, FRAP 4 or 28 U.S.C. 1446 and 1447, from the date of the event the rule counts from.
• Federal legal holidays for a year (federal_legal_holidays). List the legal holidays for a year under FRCP 6(a)(6) and FRAP 26(a)(6): the eleven days in 5 U.S.C. 6103(a), the Friday observed for a Saturday holiday (5 U.S.C. 6103(b)(1)), the Monday observed for a Sunday holiday (Executive Order 11582), and the days the President closed the executive branch.
• Count a federal period in days (federal_count_days). Count a period stated in days from a date under FRCP 6(a) or FRAP 26(a): leave out the trigger day, count every day, and if the last day is a weekend or legal holiday roll to the next open day (or, for a period counted backward before an event, to the preceding one).

What comes back

Every deadline arrives with the rule and subdivision it rests on, the rule text quoted from the official source, and a status line saying whether an attorney has countersigned that rule row. Where a question is not settled (an observed holiday, a presidential closure day, whether Rule 6(d) reaches the period), the answer gives the due date under the prevailing reading and also the earliest date, which is safe for a party computing its own deadline, and the latest date, which is the floor for arguing that someone else filed late. The tools tell your assistant to repeat those qualifiers rather than strip them.

Here is the deadline block for interrogatories served by mail on Thursday, October 8, 2026, computed by the same engine when this page was built:

2026-11-12 (Thursday)  Answers and objections to interrogatories (FRCP 33(b)(2))
    Note: State holidays are not applied (FRCP 6(a)(6)(C); FRAP 26(a)(6)(C)). Leaving one out can only move this date earlier, never later. See the note on state holidays below.
    Note: 3 days were added under Rule 6(d) after the period would otherwise have expired under Rule 6(a), and the date was rolled again.
    Authority: FRCP 33(b)(2)  https://www.uscourts.gov/sites/default/files/document/federal-rules-of-civil-procedure.pdf#page=76
    Authority: FRCP 6(d)  https://www.uscourts.gov/sites/default/files/document/federal-rules-of-civil-procedure.pdf#page=33
    Authority: FRCP 29(b)  https://www.uscourts.gov/sites/default/files/document/federal-rules-of-civil-procedure.pdf#page=69
    Status: not yet countersigned. The rule text was transcribed from the official source; no attorney has countersigned this row.

The 30 days end on Monday, November 9. Rule 6(d) adds its 3 days after the period would otherwise expire, so the answer is Thursday, November 12. Adding the 3 days first and then counting gives Tuesday, November 10, a date that looks right and is two days early.

What it does not do

• It holds no data about you. The tools take dates and return dates. There is no account, no login and no record of what was asked.
• It applies no local rules and no state holidays yet. No district's local rules or chambers rules are applied, and Rule 6(a)(6)(C) state holidays are left out, which can only make a forward deadline earlier. Each answer says so.
• It is not legal advice, and it is not a docketing service. A case management order, a standing order or a local rule can move almost any of these dates, and no server knows what your judge ordered. See the methodology page for what this site does not cover.

Why the answers are checkable

The tools do not have their own copy of the arithmetic. They call the same functions the calculators on this site call, so the server cannot quietly drift away from the page you can open and read. If a tool ever gives you a date this site does not give, that is a bug worth reporting.

68 rule rows transcribed from the official text on 2026-09-30. None has been countersigned yet. Every answer carries the status of the rule rows it used. The rule text, its source and its edition for every row are on the rule verification record, and what has changed since launch is on the changelog.

If something is wrong

Send the tool name, the arguments you passed and the answer you got to errors@federalcourtdeadlines.com. A deadline calculator that is wrong is worse than no calculator, and that goes double for one an assistant will repeat without checking.