ERClinic MCP server

Find agenda times, read appointments; book, confirm and cancel them in ERClinic. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect ERClinic50 free tool calls a month

What can I ask?

Turn on the ERClinic connector, then ask in plain words. The AI picks the tools.

Which appointments do we have tomorrow, and which are still not confirmed?
Find the first free time for a cardiology visit next week with Dr. Silva.
Who has a birthday this week among our patients?
Cancel the 15:00 appointment for patient 4821 on Friday.

What you can do with ERClinic in Claude and ChatGPT

For clinics in Brazil that run their unit agenda and bookings in ERClinic.

Plan the agenda by unit and professional

List the clinic's units and professionals. Then list the appointments of a date range to see what is booked.

Find the first open time for a visit

List the dates that have open agenda slots, then the times of one date. Insurance and specialty filters need a professional id.

Book an appointment at an open time

Book a new appointment in the clinic agenda. The booking is real: patients and staff see it. Check the time first.

Changes data

Confirm or cancel an appointment

Set an appointment to confirmed, or cancel it so the slot can be booked again. Repeating a confirm leaves the appointment confirmed.

Changes data

Check procedures and insurance plans

List the active procedures of a professional, with their preparation text. List the insurance plans the clinic accepts.

How do I connect ERClinic?

Before you connect

The login page asks for your ERClinic Api-Key.

Your clinic admin creates it in ERClinic → Configurações → Configurações da Clínica → Integrações (Criar nova Chave API Pública). The key is used only to call the ERClinic API for your clinic.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name ERClinic and this URL, then click Add:
https://erclinic.usefulapi.io/mcp
Claude opens the login page: enter your ERClinic Api-Key.
In a chat, click + → Connectors and turn on ERClinic.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name ERClinic and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://erclinic.usefulapi.io/mcp
ChatGPT opens the login page: enter your ERClinic Api-Key.
In Plugins, install ERClinic, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

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

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

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

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "erclinic": {
      "type": "http",
      "url": "https://erclinic.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add erclinic --url https://erclinic.usefulapi.io/mcp

codex mcp login erclinic

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://erclinic.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ERClinic Api-Key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper user	$9/mo · $90/yr	10,000 tool calls / month
Pro+per user	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this ERClinic server only. Ask your AI to run erclinic_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with erclinic_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with erclinic_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 19

Show all 19 tools (the AI picks them for you)

Read only · 10

List unitserclinic_list_unities
List the clinic's units, and whether each accepts in-person and tele-consultation bookings. Good first call.
List specialtieserclinic_list_specialties
List active specialties (numeric ids), optionally only those of one professional.
List professionalserclinic_list_professionals
List the clinic's professionals (id, name, gender, age range), optionally filtered by insurance, procedure or specialty.
List procedureserclinic_list_procedures
List active procedures for one professional (id, name, preparation text). Insurance or specialty filters also need professional_id.
List insurance planserclinic_list_insurance
List active insurance plans (convênios) with their ids, optionally for one professional.
Find dates with free slotserclinic_get_available_dates
List dates with free agenda slots. Defaults: from today to 30 days ahead. Insurance or specialty filters need professional_id.
Find free times on a dateerclinic_get_available_times
List the free times on one date. Insurance or specialty filters need professional_id.
List appointmentserclinic_list_appointments
List appointments by date range, appointment id, patient, professional or status (AGENDADO, CANCELADO, CONFIRMADO, ATENDIDO).
Find a patienterclinic_find_patient
Find one patient by id, CPF or phone. Returns personal data (sensitive, LGPD).
List patients with a birthdayerclinic_list_birthdays
List patients whose birthday is on one month and day (mm-dd). Returns personal data (sensitive, LGPD).

Changes data · 5

Create an appointmenterclinic_create_appointment
Book a new appointment in the clinic agenda. Creates a real booking that patients and staff see.
Confirm an appointmenterclinic_confirm_appointment
Set one appointment's status to CONFIRMADO. Repeating the call leaves it confirmed.
Cancel an appointmenterclinic_cancel_appointment
Set one appointment's status to CANCELADO. The slot is freed for other bookings.
Create a patienterclinic_create_patient
Register a new patient record in the clinic. Creates personal data (sensitive, LGPD).
Update a patienterclinic_update_patient
Update a patient's record. The API requires every field, so send the current value for any field you do not change. Personal data (sensitive, LGPD).

Your usefulapi plan · 4

Usage status (free-tier meter)erclinic_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featureerclinic_request_feature
Tell usefulapi that the user needs something the ERClinic tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+erclinic_upgrade
Get a paid plan for ERClinic (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptionerclinic_cancel_subscription
Cancel the caller's ERClinic Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run erclinic_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with ERClinic in Claude or ChatGPT?

Plan the agenda by unit and professional. Find the first open time for a visit. Book an appointment at an open time. Confirm or cancel an appointment. Check procedures and insurance plans. See what you can do for the details.

Is this an official ERClinic product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by ERClinic. The server calls the ERClinic API with your own ERClinic access, so it sees only the data that your account can see.

Can I connect ERClinic to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your ERClinic Api-Key. See Before you connect for where to find it.

Do I put my ERClinic key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ERClinic Api-Key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my ERClinic credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the ERClinic API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in ERClinic.

Can the AI change my ERClinic data?

Yes, if you approve it. 5 of the 15 ERClinic tools can create or change data. The other 10 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this ERClinic server only. Cancel any time: your paid plan then runs to the end of the paid period. Run erclinic_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run erclinic_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run erclinic_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a ERClinic tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with erclinic_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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