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MCJars MCP server

Which MCP servers are MCJars'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 2026-10-30

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Whose server it is
  • Registry namecom.mcjars/minecraftverified in the MCP registry

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

When we asked itchecked 2026-10-30
  • Stateanswerschecked 2026-10-30
  • Tools3
  • Server calls itselfcom.mcjars/catalog
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-30 the server answered initialize and tools/list without a sign-in. First answer in 340 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 4 of the 7 days it takes to judge reliability.

Once connected

  • For "find proxy jars such as Velocity or BungeeCord", the likely first call is list_providers.
  • Parameters are untyped or undescribed in 2 of 3 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: 4, the first on 2026-10-30
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer261 ms
  • Space in an agent's context≈ 1,668 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsB · 89 of 100
  • Typed results0 of 3 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 2 of 3

What an agent can do with it

  • not sure · compare Paper, Fabric and Forge server builds
  • not sure · download a specific vanilla or Bedrock server version
  • can do · find proxy jars such as Velocity or BungeeCord

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 offers3 tools · read 2026-10-30
  • list_providers

    List available Minecraft server software and proxy providers with their slugs, descriptions, and latest-version summaries.

  • list_versions

    Browse provider builds in catalog order (newest first). Filter by Minecraft version and channel. Each result groups all operating-system downloads for one build. Stable builds only unless requested otherwise.

  • get_download

    Get an exact provider build or the newest matching build when version is omitted. Minecraft and loader versions are separate: use minecraftVersion for the game, version for the full provider build. Returns URLs only; does not download or…

How to connect

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

{
  "mcpServers": {
    "minecraft": {
      "type": "http",
      "url": "https://mcjars.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http mcjars https://mcjars.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcjars.com/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.