Dev Facts Check in Claude
EOL, licences, browsers, RFCs. The MCP server is https://devfacts.openkrill.app/mcp. No key. The steps below are only for Claude. A call to check_license was checked against that server on 2026-10-01.
What this server answers
Check the facts a developer asks for again and again: when a software version reaches end of life, what an open-source license is, whether a web feature works in a browser and what an RFC says about itself.
Ask "is Node.js 20 still supported?", "is the MIT license OSI approved?", "can I use CSS container queries in Safari?" or "which RFC obsoletes RFC 2616?".
It reads four public sources: endoflife.date for release cycles and support dates, the SPDX License List for license identifiers and OSI and FSF status, webstatus.dev for Baseline status and the first browser version that supports a web feature, and the RFC Editor and IETF Datatracker for RFC status, abstracts and obsoleting links.
Every answer names its source and the date of the data. endoflife.date is maintained by volunteers, so confirm a date with the vendor before a contract or compliance decision. A license answer identifies a license and does not say what it lets you do: it is not legal advice.
It does not scan packages for vulnerabilities or health: use the Package Health Check plugin for that.
It stores nothing about you: answers are cached for a few hours and the only lasting record is a daily count of calls per tool.
What it can do
- Shows whether a version of a product has reached end of life, with its end-of-life and LTS dates
- Lists the release cycles of a product that are still supported, newest first, with the latest patch
- Looks up an SPDX license by identifier or name: OSI approved, FSF free, deprecated or not
- Shows the first release of each major browser that supports a web feature, and its Baseline status
- Looks up an RFC by number or title words: status, abstract, and the RFCs that obsolete or update it
- Names the source and the date of its data in every answer
Tools
get_eol_status, Get end-of-life status. Use this when the user asks whether a software version is still supported or when it reaches end of life, such as "is Node.js 20 still supported?" or "which Python versions get security fixes?". Pass the product (nodejs, python, ubuntu, postgresql and so on) and optionally a version or release cycle. With a version it returns that cycle's end-of-life date, whether it has passed, LTS dates and the latest patch. Without one it returns the release cycles that are still supported. Data comes from endoflife.date, maintained by volunteers: confirm with the vendor for contract or compliance decisions. Not for package vulnerabilities: use the Package Health Check plugin.check_license, Check a license. Use this when the user asks about an open-source license, such as "is the MIT license OSI approved?" or "what is the SPDX id of Apache License 2.0?". Pass an SPDX identifier or the license name. Returns the SPDX id, full name, whether it is OSI approved, whether the FSF lists it as free, whether the id is deprecated, and the SPDX page. If the name matches several licenses it returns candidates to choose from. It identifies a license and does not say what the license permits or requires. It is not legal advice.check_browser_support, Check browser support. Use this when the user asks whether a web platform feature works in browsers, such as "can I use CSS container queries in Safari?" or "is subgrid Baseline?". Pass the feature name or its id. Returns its Baseline status (widely available, newly available or limited), the dates it reached them, and the first version that supports it in Chrome, Edge, Firefox and Safari, including Android and iOS. A browser shown as null has not shipped the feature. If the name is unclear it returns candidate features.lookup_rfc, Look up an RFC. Use this when the user asks about an RFC, such as "which RFC obsoletes RFC 2616?" or "find the RFC about WebSocket". Pass either the RFC number, or words from its title (not both). A number returns the title, status, publication date, authors, abstract, and the RFCs it obsoletes, is obsoleted by, updates and is updated by. Title words return up to five matching RFCs with their numbers: call again with a number for the details.
Add Dev Facts Check 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. Dev Facts Check 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:
- Open Customize, then Connectors.
- Select the plus button, then Add custom connector.
- Paste
https://devfacts.openkrill.app/mcp. Leave Advanced settings empty: this server does not need an OAuth client id or secret. - Select Add. The connector is yours. Anthropic has not reviewed it, and it is not a Directory listing.
- In a conversation, open the plus button, then Connectors, and enable Dev Facts Check. Ask: Is Node.js 20 still supported, and when does it reach end of life?
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 dev-facts https://devfacts.openkrill.app/mcpThat 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 dev-facts. The tools you should see are get_eol_status, check_license, check_browser_support, lookup_rfc.
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. Dev Facts Check 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.
A call checked on 2026-10-01
MIT is an SPDX identifier. The answer is the public license record, not legal advice. The request below was posted to https://devfacts.openkrill.app/mcp as tools/call. HTTP 200. Source: the Dev Facts Check server, read 2026-10-01.
{
"method": "tools/call",
"params": {
"name": "check_license",
"arguments": {
"license": "MIT"
}
}
}- status. ok
- asOf. 2026-09-16
- source. SPDX License List (https://spdx.org/licenses)
- notice. Identifies a license and its OSI and FSF status. It does not say what the license permits or requires, and it is not legal advice: read the license text.
- license name. MIT License
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.