LienDeadline MCP server

Mechanics lien and notice deadlines in Claude, ChatGPT, Cursor and any MCP client

Ask your AI assistant when your preliminary notice and lien deadlines fall. Every date cites its statute, a missing fact returns “needs review” instead of a guess, and you need no account or key.

Add to Claude Install in Cursor Install in VS Code

Hosted server

Connect with one URL

Streamable HTTP, no sign-in. Paste it into any MCP client.

https://mcp.liendeadline.com/mcp

Other clients

Claude Code

claude mcp add --transport http liendeadline https://mcp.liendeadline.com/mcp

ChatGPT

Open Plugins and select +.
Choose Add custom MCP server.
Paste the URL above.
Select No authentication.

Codex CLI

codex mcp add liendeadline --url https://mcp.liendeadline.com/mcp

Run it locally

npx -y liendeadline-mcp

Needs Node.js 22.22 or newer. The local server also serves the two customer API tools.

Example

Ask in plain language, get dates with statutes

LienDeadline returns the Notice to Owner deadline, Sep 17, 2026, under Fla. Stat. § 713.06(2)(a), and the claim of lien deadline, Dec 9, 2026, under Fla. Stat. § 713.08(5). — Real output from the hosted connector, October 2026. An educational baseline, not legal advice.

Coverage

What it calculates today

When LienDeadline can't calculate a date, it says so and explains why.

Calculated supplier deadlines: Preliminary notice and lien filing for Florida and Kansas private projects.
More states: Added as each state's reviewed rules are released.
Everything else: Returns “needs review” with the reason: other states, public projects and any deadline that depends on a fact you don't know.
Lien guides: All 50 states and DC, with statute citations.
Invoice-based deadlines: Available with a customer API key through the local MCP server.

Tools

Five public tools, all read-only

calculate_supplier_deadlines: Preliminary notice and lien filing deadlines from your delivery dates and yes, no or unknown answers about events that can move a deadline.
get_supplier_questions: Checks whether a state, project type and hiring relationship are covered, and lists the questions to ask with their sources.
calculate_supplier_deadlines_v3: Calculates the deadlines from the facts gathered with get_supplier_questions.
get_state_lien_guide: One state's lien guide: rules, statute citations, a deadline table and common questions.
list_state_lien_guides: Lists every guide, for all 50 states and DC.

Two more tools, calculate_lien_deadline and list_supported_states, calculate invoice-based deadlines with a customer API key. They run on the local server only.

Privacy and safety

Read-only, and only the facts you give

Read-only. Nothing sends notices, files liens or makes payments.
Sends only the facts you give. State, dates, project type, who hired you and your yes, no or unknown answers. Guide lookups send only a state code.
Nothing stored between requests. No account, no key.

Details are in the privacy policy.

Resources

Source, packages and reference

Pair it with the agent skill

The skill teaches your agent which facts to collect before it asks for a date.

See the agent skill

Not legal advice. Results are educational baselines calculated from published state rules. Statutes change and every project is different, so verify critical deadlines with counsel. LienDeadline is not a law firm and does not file anything on your behalf.