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Switchje MCP server

Which MCP servers are Switchje's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

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Whose server it is
  • Registry namenl.switchje/open-dataverified in the MCP registry

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

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools5
  • Server calls itselfswitchje-open-data
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 367 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 6 of the 7 days it takes to judge reliability.

Once connected

  • Parameters are untyped or undescribed in 4 of 5 tools: check arguments before calling.

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.

Measured dailydaily checks: 6, the first on 2026-10-27
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer546 ms
  • Space in an agent's context≈ 538 tokensthe definitions of all its tools (5), which an agent carries on every turn
  • Tool definitionsC · 70 of 100
  • Typed results0 of 5 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 4 of 5
  • Not saying whether it only reads or can destroy: 5 of 5

What an agent can do with it

  • not sure · compare fixed, variable and dynamic energy contracts side by side
  • not sure · answer six questions to see the cheapest contracts
  • not sure · revisit the day's contract prices through a seven-day link

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

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 →

Tools it offers5 tools · read 2026-10-27
  • cheapest_today

    The five cheapest energy offers in the Netherlands for a standard household profile on the most recent day with data, with a coarse cost split (supply, taxes and levies, network, feed-in, one-off) and the time each price was fetched…

  • cheapest_history

    The five cheapest offers per day for a standard profile over a date range (ISO dates, inclusive; both optional). A missing day had no valid run.

  • market_summary

    Market aggregates for one day (ISO date; default the most recent) and profile: offers priced per contract type, median yearly cost, spread between cheapest and priciest, offers with cashback, offers added and withdrawn that day.

  • offer_lifecycle

    When each offer was first seen on sale and when it was withdrawn (empty = still on sale), across every supplier we track; optionally filtered by supplier code (e.g. 'eneco').

  • methodology

    How Switchje ranks offers, the standard profiles spelled out, the licence and how to attribute.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "open-data": {
      "type": "http",
      "url": "https://switchje.nl/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http switchje https://switchje.nl/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://switchje.nl/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.