On the Register MCP Server

by co-ontheregister Your server? Claim it

not responding

On the Register is listed as active in the registry but did not answer our last check. It exposes 23 tools.

Checks weight loss clinics and online pharmacies against the UK regulator registers (CQC, GPhC).

Uptime history 23 hours of history · worst hour 0%

23 hours agonow

22.6%

Uptime 24h

19 of 84 checks

Tools

read from the server

1214 ms

Response time

average over 24h

open, no key

Access

streamable-http

On the Register does not always answer

Over the last week it answered 22.6% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add on-the-register --transport http https://ontheregister.co.uk/api/mcp

Settings → Connectors → Add custom connector, then paste this address

https://ontheregister.co.uk/api/mcp

~/.codex/config.toml

[mcp_servers.on-the-register]
url = "https://ontheregister.co.uk/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "on-the-register": {
      "url": "https://ontheregister.co.uk/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "on-the-register": {
      "type": "http",
      "url": "https://ontheregister.co.uk/api/mcp"
    }
  }
}

Available tools 23

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

providers

providers_check

Check a provider by name, website URL or postcode against our CQC/GPhC register data. Returns whether it is a registered, listable provider and its registration wording, with how it was resolved. If we don't hold it, returns the official register to search by hand. Never a guess.

providers_get

Get one registered provider by its slug: its registration wording and rating, the treatments it offers, its locations, and its own published consultation fee where known. Returns null if the slug is not a listable provider. Registration facts only, no recommendation.

providers_search

Find UK providers that offer a treatment and are on the CQC/GPhC register. Filter by treatment (glp1-weight-loss, hormone-therapy, iv-therapy, vitamin-injections), kind (online/clinic/mobile), nation, town slug, a name search, or near a postcode. Sort by distance, CQC rating, Google rating or review count. Returns listings with registration wording, the Google rating and the provider's own consultation fee where published. Lists, never ranks by price or recommends.

calc

calc_convert

Convert between a dose (mg or mcg), syringe units and mL at a known strength. Give the strength as conc_mg_ml, or as vial_mg + water_ml. Set direction to dose_to_units or units_to_dose. Returns the counterpart plus concentration and mcg per unit. Arithmetic only.

calc_reconstitute

Work out the units to draw for a prescribed dose from a powder vial and bacteriostatic water. Inputs: vial mg, water mL, the dose (mg or mcg), and the syringe. Returns units, mL, the nearest syringe line and doses per vial. Arithmetic only — the user's own dose, no presets.

compounds

compounds_get

Get one compound's UK legal status: whether it is licensed, in trials, cosmetic or unlicensed, the evidence and risks, and the licensed alternative. Returns sources and dates. No dosing is included, by design.

compounds_list

List the UK peptide/compound profiles with their UK legal status (licensed, in trials, cosmetic, or research/unlicensed). Filter by status or category. Returns name, aka, class, status and the licensed alternative. A legal-status index, not a dosing tool.

howlong

howlong_clearance

Estimate when a GLP-1/GIP injection is essentially cleared after the last dose, from the SmPC half-life (about five half-lives). Give the drug and the last-dose date. Returns the clear date and whether the basis is the SmPC or an estimate. Informational.

howlong_timeline

Give the SmPC milestones for when a GLP-1/GIP injection starts working: when appetite drops, when the first full dose is, and how the effect builds. Returns dated-by-week milestones with their citation. Informational, no prediction for any one person.

pen

pen_howto

Give the step-by-step injection walkthrough for a GLP-1 pen (Mounjaro KwikPen, Wegovy, Ozempic or Saxenda), from the maker's UK instructions. Returns the ordered steps and the symptom list you can troubleshoot. Routes to the leaflet; not a substitute for it.

pen_troubleshoot

Answer a GLP-1 pen problem (won't dial, no clicks, stuck, not at zero, no drop at the needle, a bubble, a leak, cold, unsure) for a given pen, from the maker's UK leaflet. Returns what it means and what to do, with when to stop and call the pharmacist.

bmi

bmi_check

Body mass index from weight and height, with the NHS adult category and the healthy-weight range for that height. UK thresholds; note the NHS lowers them for some ethnic backgrounds. General information, not a diagnosis.

compare

compare_medicines

Put two weight-loss/diabetes injections (Mounjaro, Wegovy, Ozempic, Saxenda) side by side on SmPC facts: doses, frequency, pen, licensing, NHS access, storage. Returns a row-by-row table with the rows that differ flagged. Facts only, never a 'which is right for you'.

energy

energy_tdee

Daily energy use (BMR via Mifflin-St Jeor, then TDEE for activity) and two safe calorie-deficit targets for weight loss, clamped to the NHS lower limits. Needs age and sex for the equation. General information, not a diet plan.

fluid

fluid_target

Rough daily fluid estimate from body weight (about 30-35 ml/kg), framed against the NHS 6-to-8-glasses guidance. Needs rise in heat, with exercise, and with GLP-1 sickness. A general estimate, not a medical fluid target.

guides

guides_list

Browse On the Register's plain-English UK guides to weight-loss medicines and the providers who supply them: checking a provider, cost and NHS access, using a pen, and side effects and treatment. Filter by category. Returns each guide's title, summary and page URL to link as further reading.

patch

patch_calendar

Lay out the change days for an HRT estradiol patch from the day the first patch goes on, and rotate the application site. Products: estradot, evorel, evorel_conti, estraderm_mx (twice weekly); femseven, femseven_conti, progynova_ts (weekly). Optional weeks to show (default 8). SmPC change interval, not dosing advice.

protein

protein_target

Work out a daily protein target for someone losing weight on a GLP-1, from weight (and height, which sharpens it) and activity level. Returns grams per day with the band and which body-weight basis was used. General information, not personalised dietetic advice.

sideeffects

sideeffects_list

List the SmPC side effects of a GLP-1/GIP injection (Mounjaro, Wegovy, Ozempic, Saxenda) by frequency band, plus the serious warnings with what to do (999/111/prescriber) and the Yellow Card link. General leaflet information, not a prediction and not triage.

storage

storage_check

Say whether a GLP-1 pen or a reconstituted peptide vial is still good, given the situation (unopened, in use in the fridge, or left out) and, if left out, how long and how warm. Returns a graded verdict with the SmPC in-use limit. No dosing.

supply

supply_runout

Work out when an HRT or testosterone gel, spray or sachet pack runs out and when to reorder. Inputs: product (oestrogel, sandrena, lenzetto, testogel_pump, testogel_sachet, tostran), doses per day, optional containers, pack-opened date and reorder lead days. Returns doses left, days, run-out and order-by dates. Counts are estimates for metered packs.

waist

waist_ratio

Waist-to-height ratio from waist and height, against the NICE bands (keep your waist under half your height). Flags central-fat risk that BMI can miss. For adults with BMI under 35. General information, not a diagnosis.

weight

weight_ideal

Healthy-weight range for a given height, from the healthy BMI band (18.5-24.9), with the BMI-22 midpoint as a single figure. There is no one 'ideal weight'; this is the healthy range. General information.

Endpoints

URL	Transport	State	Latency	Checked
https://ontheregister.co.uk/api/mcp	streamable-http	answering	56 ms	2 min ago

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On the Register — questions

Answers built from our own checks of this server.

What can On the Register do?

It exposes 23 tools, read directly from the server on our last check. Among them: bmi_check, calc_convert, calc_reconstitute, compare_medicines, compounds_get, compounds_list and 17 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is On the Register mostly used for?

Its tools cluster around providers, calc and pen. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is On the Register working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 19 of 84 checks got a reply (22.6%), average response time 1214 ms. The bar chart above shows every period we have measured.

The registry lists On the Register as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect On the Register?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does On the Register need an API key?

No. On the Register completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 23 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is On the Register?

It answers our handshake in 1214 ms on average, which is faster than 2% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.