Document Tools in Claude

Questions it answers

Four small document jobs in one place: count the words in a text, translate a web page you own into another language, make a calendar file, or turn a table into a CSV file.

Ask "how many words and characters is this?", "will this fit in one SMS?", "translate my docs page into Vietnamese, I own it", "make a calendar file for a meeting every Monday at 10 in New York" or "put these rows in a CSV I can open in Excel".

Counting gives characters, words, sentences, paragraphs, lines, SMS segments, reading time and Flesch reading scores, and states the rule behind each count.

Calendar files follow RFC 5545 and open in Google Calendar, Outlook and Apple Calendar, with time zones, repeats, reminders and all-day events. CSV files follow RFC 4180, with correct quoting and an optional byte order mark for Excel.

Translation reads a public web page that you own or have the rights to translate, such as your documentation or public-domain text, and returns Markdown in about 100 languages with headings, lists and code blocks in place.

It does not add events to your calendar, open or edit an existing spreadsheet, or translate copyrighted fiction or comics. Files come back as text and as a download link that expires after 24 hours. Your text and pages are not stored.

What it can do

• Counts characters, words, sentences, paragraphs and lines, with the counting rules stated
• Reports SMS encoding and how many segments a message takes
• Estimates reading time and Flesch reading scores for English text
• Makes .ics calendar files with time zones, repeats, reminders and all-day events
• Makes CSV files with correct quoting and an optional Excel byte order mark
• Returns the file text and a download link that works for 24 hours
• Translates owned web pages, documentation, and public-domain text into clean Markdown without persistent copies

Tools

• count_text, Count words and characters. Use this when the user asks how long a text is, for example "how many words is this", "character count for this tweet", "will this fit in one SMS", "how long does this take to read". Input tips: pass text exactly as written, up to 20,000 characters (about 3,500 words); do not trim or fix it. Returns: characters, characters without spaces, graphemes (user-perceived characters), words, sentences, paragraphs, lines, UTF-8 bytes, SMS encoding, units and segments, reading minutes, and Flesch reading ease and grade (English only, null otherwise), with the rule used for each count. Not for: counting text inside a file, PDF or spreadsheet the tool cannot see (paste the text instead), or counting tokens for a model. Errors: a text over the limit is refused; split it and add the counts. The text is not stored.
• make_calendar_file, Make a calendar (.ics) file. Use this when the user wants a calendar file to import, for example "make a calendar file for this meeting", "create an .ics for my weekly class", "export these dates so I can import them". Input tips: pass 1 to 50 events, each with a title, a start (2026-11-02 for all day, or 2026-11-02T09:30) and an end or duration_minutes, plus timezone (IANA name such as Europe/Paris) for a time without Z or an offset; ask the user for the time zone, never guess it. Example event: {"title":"Sprint review","start":"2026-11-02T09:30","duration_minutes":45,"timezone":"Europe/Paris"}. Optional: location, description, reminder_minutes and recurrence (freq daily, weekly, monthly or yearly, with interval, until or count, and byday). Returns: the .ics text, a download link that works for 24 hours, its expiry and the event count. Not for: adding, changing or reading events in Google Calendar, Outlook or any calendar account; it only makes a file. Errors: status invalid with a message naming the event and field to fix.
• make_csv_file, Make a CSV file. Use this when the user wants a new CSV file from a table, for example "put this table in a CSV", "make a spreadsheet file from these rows", "export this list as CSV for Excel". Input tips: pass columns (header names) and rows, where each row has exactly one cell per column (text, number, true, false or null for empty). Example: columns ["name","city"], rows [["Ada","London"],["Linus","Helsinki"]]. Up to 2,000 rows and 100 columns. Optional: filename, excel_bom (true when the user opens it in Excel and the text has accents) and escape_formulas (show cells starting with = + - or @ as text). Returns: the CSV text, a download link that works for 24 hours, its expiry, the row count and byte size. Not for: opening, reading, editing or adding up an existing spreadsheet or .xlsx file; it only writes a new CSV. Errors: status invalid with a message naming the row and cell to fix.
• translate_page, Translate a webpage or documentation. Use this when the user wants to translate a public webpage, documentation or public-domain text that they own or have the rights to translate. Input tips: url of the page (http or https), target_lang as a language code such as vi, es, fr, de, ja, zh, pt, ko, and confirm_rights true only after the user confirms the rights. Returns: clean Markdown with headings, lists and code kept, usually in 5 to 15 seconds for a page of up to 8,000 characters, plus characters left today. Not for: copyrighted fiction, manga, manhwa or commercial comics, pasted text, local files or pages behind a login. Errors and next step: rights_not_confirmed (ask the user, then set confirm_rights true); page_too_large over 12,000 characters (offer a shorter page, such as one chapter on its own URL); fetch_failed or no_content (check the URL opens without a login, or pick a page whose text is in the HTML); daily_translation_spent (the daily character limit is used up; try again after 00:00 UTC); translation_failed (try again in a minute).

Add Document Tools in Claude

Claude connects to a remote MCP server as a custom connector. The connection is made from Anthropic's cloud, not from your laptop, so the server must be on the public internet. Document Tools is. These steps were checked against Claude's custom-connector article (updated 2026-08-11) and the Claude Code MCP docs on 2026-10-01.

On a Pro or Max plan:

1. Open Customize, then Connectors.
2. Select the plus button, then Add custom connector.
3. Paste this URL. Leave Advanced settings empty: this server does not need an OAuth client id or secret.

   https://docs.openkrill.app/mcp

4. Select Add. The connector is yours. Anthropic has not reviewed it, and it is not a Directory listing.
5. In a conversation, open the plus button, then Connectors, and enable Document Tools. Ask: How many words and characters is "The quick brown fox jumps over the lazy dog."?

On Team and Enterprise, an Owner adds the connector first at Organization settings, then Connectors, then Add, then Custom, then Web, and pastes the same URL. Members then connect it from Customize. A Free plan can add one custom connector.

In Claude Code, add it from the project directory:

claude mcp add --transport http docs https://docs.openkrill.app/mcp

That writes a local or user config. A JSON entry needs "type": "http" (or streamable-http) plus the url. An entry with a url and no type is skipped. Confirm with claude mcp get docs. The tools you should see are count_text, make_calendar_file, make_csv_file, translate_page.

If Claude tries to fetch https://docs.openkrill.app/mcp from its code sandbox and reports HTTP 403, the block is Claude's sandbox network allowlist, not this server. The sandbox proxy answers 403 with x-deny-reason: host_not_allowed for every host outside the allowlist. Use the connector above instead: connector calls come from Anthropic's cloud and do not pass the sandbox proxy. To let the sandbox reach it as well, an Owner adds docs.openkrill.app under Settings, then Capabilities, then Additional allowed domains.

Enable the connector only in conversations that need it. Claude can call the tools while you work, including during research, so turn off any tool you do not want invoked. Document Tools does not write to your accounts. It still receives the arguments of each call. Read the privacy page before you paste anything that is not public.

If it does not work

A call checked on 2026-10-17

A short sentence is enough to show word and character counts. The text is not stored. The request below was posted to https://docs.openkrill.app/mcp as tools/call. HTTP 200. Source: the Document Tools server, read 2026-10-17.

{
  "method": "tools/call",
  "params": {
    "name": "count_text",
    "arguments": {
      "text": "Agent tools answer public questions."
    }
  }
}

The server returned structured content for this call.

Repeat the call yourself if you need a newer reading. Cached answers expire. A rate limit is not a result: wait and try again. Nothing in the call is a ranking, a filing, or advice.

Using it in production

Nothing to install and nothing to run: no package, no Python or Node.js version and no environment variable. Document Tools runs on our servers, and your client only needs the URL https://docs.openkrill.app/mcp.

Use it in other apps

• Document Tools in ChatGPT
• Document Tools in Cursor
• Document Tools in VS Code
• Document Tools in Pi

Roles that use Document Tools

• Writer guide

Frequently asked questions

Words on this page

• MCP (Model Context Protocol) definition
• Streamable HTTP transport definition
• Tool primitive definition
• Rate limit policy definition

Source: plugin listing for docs in this repository, and a live tools/call on 2026-10-17. As of 2026-10-17.