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Clio MCP by usefulapi

io.usefulapi/clio in the official MCP registry. Endpoint https://clio.usefulapi.io/mcp. Source: github.com/m190/usefulapi-mcp.

The registry describes it as: Read Clio matters, contacts, time, tasks, calendar and bills; add matters, time entries, notes.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

claude mcp add --transport http clio https://clio.usefulapi.io/mcp

{
  "mcpServers": {
    "clio": {
      "url": "https://clio.usefulapi.io/mcp"
    }
  }
}

code --add-mcp '{"name":"clio","type":"http","url":"https://clio.usefulapi.io/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which.

Let Claude Code check servers as it adds them

With the free lazaretto-guard plugin installed, when Claude Code adds a server for you or writes one into an MCP config, the plugin reads the server's tools first and asks you if one of our rules matches. Install it, restart Claude Code, then ask it to run the command above.

claude plugin marketplace add jamesdfinance-dev/lazaretto-plugins
claude plugin install lazaretto-guard@lazaretto-plugins

Tools it advertises

clio_who_am_i clio_list_users clio_list_matters clio_get_matter clio_list_contacts clio_get_contact clio_list_activities clio_list_tasks clio_list_calendar_entries clio_list_bills clio_get_bill clio_list_documents clio_list_notes clio_list_custom_fields clio_list_communications clio_create_contact clio_create_matter clio_create_time_entry clio_create_task clio_update_task clio_create_note clio_log_communication clio_create_calendar_entry

Tool changes

We compare every full read of this server with the one before. No change in what its tools say has been seen since we started keeping this record on 2026-10-30.

Fingerprint of its tools at our last full read (2026-11-01): 60caf43da7331e06. A client can hash the tools it is served the same way and compare; the full value and a hash per tool are in this page as JSON.

Run this server? Show the check in your README

The badge reflects the latest weekly read:

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-usefulapi-clio/badge.svg)](https://lazaretto.dev/mcp-registry/io-usefulapi-clio)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.

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