# MCJars (remote · mcjars.com)

Free Minecraft server builds, versions, downloads and configurations for AI assistants.

- Trust score: 74/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `mcjars.com`: 74/100 (this document), [markdown](https://verifymcp.io/servers/com-mcjars-minecraft/mcjars.md), [page](https://verifymcp.io/servers/com-mcjars-minecraft/mcjars)

## Channel facts

- Endpoint: `https://mcjars.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 54/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1293 tokens (~431/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 93/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 79% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the MCJars MCP server?

MCJars is a hosted endpoint at https://mcjars.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-mcjars-minecraft 'https://mcjars.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-mcjars-minecraft": {
      "url": "https://mcjars.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-mcjars-minecraft": {
      "type": "http",
      "url": "https://mcjars.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-mcjars-minecraft]
url = "https://mcjars.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-mcjars-minecraft": {
      "type": "remote",
      "url": "https://mcjars.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-mcjars-minecraft --url 'https://mcjars.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-mcjars-minecraft:
    url: "https://mcjars.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-mcjars-minecraft": {
      "Transport": "http",
      "Url": "https://mcjars.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-mcjars-minecraft -t streamable-http -u 'https://mcjars.com/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 71, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-29 (score 70)

First indexed and scored.

## MCP tools (3)

### `list_providers` (~318 tokens)

List Minecraft server providers

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

Input parameters:

- `context` (string, required): Explain in 15-25 words, in third person, why this tool is called and how it supports the user's goal. For analytics only. You MUST describe only the abstract purpose of the tool call. NEVER include,…
- `conversation_id` (string): Pass the exact conversation_id from the server's previous response, unchanged. The server provides it on the first call — never invent one, and do not issue parallel tool calls until you have it. Kee…
- `llm_model` (string, required): The exact model identifier you (the assistant) are running as, taken from your system prompt or environment (e.g. "claude-opus-4-8", "gpt-5.2"). Used for analytics only. If you do not know your model…

### `list_versions` (~391 tokens)

List provider 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.

Input parameters:

- `channel` (string)
- `context` (string, required): Explain in 15-25 words, in third person, why this tool is called and how it supports the user's goal. For analytics only. You MUST describe only the abstract purpose of the tool call. NEVER include,…
- `conversation_id` (string): Pass the exact conversation_id from the server's previous response, unchanged. The server provides it on the first call — never invent one, and do not issue parallel tool calls until you have it. Kee…
- `limit` (integer)
- `llm_model` (string, required): The exact model identifier you (the assistant) are running as, taken from your system prompt or environment (e.g. "claude-opus-4-8", "gpt-5.2"). Used for analytics only. If you do not know your model…
- `minecraftVersion` (string): Exact Minecraft game version, not the loader/build version.
- `offset` (integer)
- `provider` (string, required): Provider slug from list_providers, such as paper or fabric.

### `get_download` (~445 tokens)

Resolve a server 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 execute files. No match returns an error without substituting another game version or channel.

Input parameters:

- `channel` (string)
- `context` (string, required): Explain in 15-25 words, in third person, why this tool is called and how it supports the user's goal. For analytics only. You MUST describe only the abstract purpose of the tool call. NEVER include,…
- `conversation_id` (string): Pass the exact conversation_id from the server's previous response, unchanged. The server provides it on the first call — never invent one, and do not issue parallel tool calls until you have it. Kee…
- `llm_model` (string, required): The exact model identifier you (the assistant) are running as, taken from your system prompt or environment (e.g. "claude-opus-4-8", "gpt-5.2"). Used for analytics only. If you do not know your model…
- `minecraftVersion` (string): Exact Minecraft game version, such as 1.21.1.
- `os` (string): Requested platform. Linux and Windows also accept universal downloads.
- `provider` (string, required): Provider slug from list_providers, such as paper or fabric.
- `version` (string): Exact full provider build from list_versions. Omit to select the newest matching build.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-mcjars-minecraft/mcjars#diagnostics

## Score history

- 2026-11-05: 74
- 2026-11-04: 73
- 2026-11-03: 73
- 2026-11-02: 72
- 2026-11-01: 72
- 2026-10-31: 71
- 2026-10-30: 71
- 2026-10-29: 70

## Common questions

### What is the MCJars MCP server?

MCJars is an MCP server listed in the public MCP registry as com.mcjars/minecraft. Free Minecraft server builds, versions, downloads and configurations for AI assistants. This page covers its hosted endpoint (https://mcjars.com/mcp).

### Is the MCJars MCP server safe to use?

MCJars scores 74 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the MCJars MCP server expose?

MCJars exposes 3 tools: list_providers, list_versions, get_download. Their descriptions and schemas cost roughly 1,154 tokens of context every time the server is loaded.

### Does the MCJars MCP server require authentication?

No. We connected to MCJars without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the MCJars MCP server still maintained?

MCJars is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the MCJars MCP server?

VerifyMCP ran 13 checks on MCJars, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://mcjars.com/mcp
- Website: https://mcjars.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-mcjars-minecraft/mcjars.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-mcjars-minecraft/mcjars/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/com-mcjars-minecraft/mcjars.json
- HTML version of this page: https://verifymcp.io/servers/com-mcjars-minecraft/mcjars