Renewably MCP server

• Registry nameuk.renewably/mcpverified in the MCP registry

The registry name sits under renewably.uk. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-11-03
• Tools10
• Server calls itselfrenewably
• Server version1.11.0
• Protocol version2025-06-18

On 2026-11-03 the server answered initialize and tools/list without a sign-in. First answer in 576 ms.

• Its tools do every use case we checked: find the cheapest hour to run appliances; show live electricity prices on a wall tablet.
• Checked on 1 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
• What an agent can do with it2 of 2 use cases
• Answeredmeasuring1 of the 7 daily checks it takes to print a share
• Median first answer612 ms
• Space in an agent's context≈ 8,433 tokensthe definitions of all its tools (10), which an agent carries on every turn
• Tool definitionsA · 100 of 100
• Typed results0 of 10 toolsdeclared outputSchema: results come typed, read once

• Every tool passes all six checks.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• list_regions

  The 14 Agile regions (GSP groups) – or, with `postcode`, the region a postcode is in: the first half is enough (eg `EH1`), and in the few districts on a boundary both regions come back, with `postcode.status` `ambiguous`.

• list_tariffs

  The time-of-use and standard tariffs from Octopus, EDF and E.ON Next that the `tariff` parameter accepts – or, with `direction=export`, their export tariffs (for /prices, /unit-rates and `export`), each saying which homes can have it…

• get_prices

  Half-hourly prices for a region from midnight today. On Agile (the default) and Agile Outgoing, each is published by Octopus or estimated by Renewably (flagged `estimate`); other tariffs show only their supplier's published prices. An…

• find_cheapest_window

  The cheapest (or lowest-carbon) run of `duration_hours` starting from the next half hour and finishing by the next `finish_by` – when to set a washing machine or dishwasher's delay timer. Cached for five minutes.

• plan_ev_charging

  The cheapest or greenest half hours to charge an electric car by a ready-by time up to four days ahead - the same as the /ev-charging/ planner, with the same parameters. Cached for five minutes.

• get_heat_pump_times

  For a typical weekday and weekend day at this time of year (on a fixed-window or flat tariff, today's rates): the cheapest time to reheat hot water (and the cheapest ready by 07:00), and the cost of each kWh of heat by hour – price…

• get_home_battery_times

  For a typical weekday and weekend day at this time of year (on a fixed-window or flat tariff, today's rates): the cheapest charge slot to fill a home battery before the 16:00 peak, an optional afternoon top-up, and what it saves a home…

• plan_home_battery

  A home battery's plan from the half hour under way to the end of tomorrow, on the tariff's real prices (Agile's, and Agile Outgoing's, estimated beyond what Octopus has published), half hour by half hour: charge from the grid, hold, run…

• plan_home

  A home's past year on every tariff in /tariffs and at Ofgem's price cap – and what switching tariff, an electric car, a heat pump, solar panels or a battery would save, each added to everything before it (tariff, car, heating, solar…

• get_flexibility_events

  When the grid operator, NESO, is asking homes in a region to use less electricity (often the evening peak) or more (often in Scotland, when there's more wind than the grid can carry south), through its Demand Flexibility Service: live…