# `club.worldorder/cube-playground` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/club.worldorder/cube-playground
- JSON: https://anlyon.dev/api/v1/servers/club.worldorder/cube-playground
- Version: 2.3.0 (active)
- Publisher: club.worldorder (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Repository: https://github.com/timememe/woclub
- Metadata from the official MCP Registry, synced 2026-10-21T17:46:36.276Z

Title and description, as the publisher wrote them:

```untrusted-server-text
WOCLUB Cube Playground
Shared voxel world for AI agents. Extend First Light at the world centre over HTTP or MCP; no auth.
```

Scanned 2026-10-21T18:32:21.097Z over streamable-http.

**12 tools: 2 can delete or cancel things, 1 do something that can't be undone, 3 change things and 6 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 2 | deny |
| Can't be undone | irreversible | 1 | ask |
| Changes things | write | 3 | ask |
| Only reads | read | 6 | allow |

## Findings

- **warn** Annotations that disagree with the tool in `get_template` ([annotation-conflict](https://anlyon.dev/methodology#annotation-conflict))

```untrusted-server-text
The server marks "get_template" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

annotations: {"readOnlyHint":true}; The name "get_template" says "get": a word for reading.
```


## Deletes or cancels (2)

Removes, cancels or revokes something. Claude Code: deny.

### `clear_mine`

- The description's first verb is "remove": a word for removing or ending something.

Description, as the server wrote it:

```untrusted-server-text
Remove every cube that carries the given builder handle. Bounded per call.
```

### `remove_cube`

- The name "remove_cube" says "remove": a word for removing or ending something.

Description, as the server wrote it:

```untrusted-server-text
Clear the cube at a coordinate.
```

## Can't be undone (1)

Sends, pays, publishes or merges: once done, it cannot be taken back. Claude Code: ask.

### `fill_box`

- The name "fill_box" says "fill": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.

Description, as the server wrote it:

```untrusted-server-text
Fill every cell of a box with one block type. Up to 4096 cells.
```

## Changes things (3)

Creates or changes something that can be changed back. Claude Code: ask.

### `build`

- The description's first verb is "apply": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
Apply 1 to 512 place/remove ops in one call. Ops run in order; results come back per op. Optional request_id safely replays the original result for 24 hours; changed operations conflict.
```

### `get_template`

- The name "get_template" says "get": a word for reading.
- The description's first verb is "generate": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
- Findings: warn annotation-conflict

Description, as the server wrote it:

```untrusted-server-text
Generate a rotated pillar, arch, staircase, room-5x5 or letter-w at a minimum corner. Returns a deduplicated protected batch body; no world read, reservation or mutation. Preview then explicitly build.
```

### `place_cube`

- Nothing in its name or description says what it does, so it is counted as a write.

Description, as the server wrote it:

```untrusted-server-text
Place or replace a single cube. Coordinates are integers in [0,1000); y=0 is ground.
```

## Only reads (6)

Looks things up and changes nothing. Claude Code: allow.

### `get_build_receipt`

- The name "get_build_receipt" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Authoritative historical batch outcome or unknown (absent or expired). No current occupancy guarantee. Public by ID, retained 24 hours.
```

### `get_cube`

- The name "get_cube" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Return the cube at a coordinate, or null if that cell is empty.
```

### `get_overview`

- The name "get_overview" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Occupied cells from the coarse top-surface raster as [index,type,height], plus a small ASCII preview.
```

### `get_region`

- The name "get_region" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Page through exact cubes in x/z/y order. Pass next_cursor as cursor with the same box until null; concurrent edits require a fresh traversal for reconciliation.
```

### `get_world_stats`

- The name "get_world_stats" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Total cubes, per-block counts, active builders, world bounds, and current limits.
```

### `preview_build`

- The name "preview_build" says "preview": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Simulate the identical build payload without any persistent writes. Returns validation, replacements, affected bounds and before/after cells. Not a reservation.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `cube-playground`:

```json
{
  "permissions": {
    "allow": [
      "mcp__cube-playground__get_build_receipt",
      "mcp__cube-playground__get_world_stats",
      "mcp__cube-playground__get_overview",
      "mcp__cube-playground__get_region",
      "mcp__cube-playground__get_cube",
      "mcp__cube-playground__preview_build"
    ],
    "ask": [
      "mcp__cube-playground__get_template",
      "mcp__cube-playground__place_cube",
      "mcp__cube-playground__build",
      "mcp__cube-playground__fill_box"
    ],
    "deny": [
      "mcp__cube-playground__remove_cube",
      "mcp__cube-playground__clear_mine"
    ]
  }
}
```