Document Tools in ChatGPT
Count text, make .ics and CSV. The MCP server is https://docs.openkrill.app/mcp. No key. The steps below are only for ChatGPT. A call to count_text was checked against that server on 2026-10-01.
What this server answers
Count the words in a text, make a calendar file you can open in any calendar app, or turn a table into a CSV file, and get the result right every time.
Ask "how many words and characters is this?", "will this fit in one SMS?", "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".
Document Tools counts characters, words, sentences, paragraphs and lines, reports how many SMS segments a message takes, estimates reading time and gives Flesch reading scores. The counting rules are stated in every answer, so you can see what a word or a character means.
It writes standard calendar files (RFC 5545 .ics) with one or many events, time zones, repeats, reminders and all-day events, and standard CSV files (RFC 4180) with correct quoting and an optional byte order mark for Excel.
Each file comes back as text you can copy and as a download link. The link works for 24 hours; after that the file is deleted. The text you ask it to count is never stored, and the only lasting record is a daily count of calls per tool.
Text counted is limited to about 3,500 words; a calendar file to 50 events; a CSV to 2,000 rows and 100 columns.
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
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". Pass the text exactly as written, at most 20,000 characters. Returns characters, characters without spaces, graphemes (user-perceived characters), words, sentences, paragraphs, lines, UTF-8 bytes, SMS encoding and segments, reading minutes, and Flesch reading ease and grade level (English only; null otherwise), with the rules used for each count. The text is not stored.make_calendar_file, Make a calendar (.ics) file. Use this when the user wants a calendar file, for example "make a calendar file for this meeting", "create an .ics for my weekly class", "export these dates so I can import them". Pass 1 to 50 events, each with a title, a start (a date for an all-day event, or a date and time) and an end or duration_minutes, plus a timezone (IANA name such as America/New_York) for a time without Z or an offset. Optional per event: location, description, reminder_minutes and a repeat (freq daily, weekly, monthly or yearly with interval, until or count, and byday for weekly). Returns the .ics text, a download link that works for 24 hours, its expiry and the event count. It makes a file only; it does not add anything to a calendar.make_csv_file, Make a CSV file. Use this when the user wants a CSV file, for example "put this table in a CSV", "make a spreadsheet file from these rows", "export this list as CSV for Excel". Pass columns (header names) and rows (each row has one cell per column; cells are text, numbers, true or false, or null), up to 2,000 rows and 100 columns. Optional: filename, excel_bom (start the file with a UTF-8 byte order mark so Excel reads 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 and the row count. It makes a file only; it does not open or edit spreadsheets.
Add Document Tools in ChatGPT
ChatGPT does not read a local config file. A custom MCP server is added in the product, and only after developer mode is on. These steps were checked against OpenAI's plugin connect guide and the ChatGPT MCP guide on 2026-10-01. Developer mode can be hidden by a workspace policy, so a Team or Enterprise admin may have to allow it first.
- Open ChatGPT settings, then Security and login, and turn on Developer mode.
- Open ChatGPT plugins and select the plus button.
- Enter a name such as "Document Tools" and a one-line description of what you want it to answer.
- Under Connection, choose the public endpoint and paste
https://docs.openkrill.app/mcp. Include the/mcppath. Do not add a tunnel id: this server is already public. - Create the connection and review the tools ChatGPT lists. You should see
count_text,make_calendar_file,make_csv_file. The feedback tools on the same server are optional and not required for the lookup. - Start a new conversation, add the connection from the tools menu, and ask: How many words and characters is this text?
No API key and no OAuth client id are required. The server answers without a login. Calls are limited per network and per day, and a limit comes back as a tool error rather than a partial answer. If the tool list is stale after a server change, open the connection and select Refresh, then start a new conversation.
The ChatGPT desktop app, Codex CLI and IDE extension share a different config. In the desktop app, open Settings, then MCP servers, choose Add server, select Streamable HTTP, and paste the same URL. In ~/.codex/config.toml the equivalent is a table named mcp_servers.docs with url = "https://docs.openkrill.app/mcp". ChatGPT on the web does not read that file. A published directory listing is also a different path: this page is the developer-mode connection, not a claim that Document Tools is already in the ChatGPT directory.
Treat the server as untrusted until you have read a few answers. A remote MCP server sees the arguments the model sends. Document Tools is read-only and documents what it sends onward on the privacy page.
A call checked on 2026-10-01
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 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "count_text",
"arguments": {
"text": "Agent tools answer public questions."
}
}
}- words. 5
- characters. 36
- sentences. 1
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.