Tasks these servers can do
What does 21 CFR 11.10 say about electronic records controls?
Call get_cfr_section on Regulation Reader (https://rules.openkrill.app/mcp). The current unofficial eCFR text, authority and amendment history, with the date it was read. It is general information, not advice about your system.
Install steps: ChatGPT, Claude, Cursor, VS Code, Pi.
What has the FDA proposed recently on a topic I name?
Call search_federal_register on Regulation Reader (https://rules.openkrill.app/mcp). Rules, proposed rules, notices and presidential documents, with comment deadlines and effective dates when the notice states them.
Install steps: ChatGPT, Claude, Cursor, VS Code, Pi.
What is the LEI of Siemens Aktiengesellschaft in Germany?
Call find_company_lei on EU Business & VAT Checker (https://eubusiness.openkrill.app/mcp). Legal Entity Identifier records from GLEIF. Names that could belong to a private person are left out.
Install steps: ChatGPT, Claude, Cursor, VS Code, Pi.
What is the 2026 US federal standard deduction for a single filer?
Call get_tax_parameters on Tax Numbers (https://tax.openkrill.app/mcp). The figure from the IRS document named in the answer. It is not a tax return and not state tax.
Install steps: ChatGPT, Claude, Cursor, VS Code, Pi.
What they will not do
Do not describe your own legal situation in the search. The eCFR is an unofficial edition. Tax figures are federal parameters, and an estimate from Tax Numbers is not tax advice.
Where to start
Each link above is a client-specific install page with one call that was checked against the live server. The plain-text list of every server is llms.txt specification. The words MCP, tool and streamable HTTP are defined in the MCP and agent glossary.