# GrowBlocks Dev Kit (npm · growblocks)

Build, play-test with screenshots, and ship three.js browser games on GrowBlocks.

- Trust score: 66/100 (medium)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-24

## Components

- npm · `growblocks`: 66/100 (this document), [markdown](https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks.md), [page](https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks)

## Channel facts

- Registry: `npm`
- Package: `growblocks`
- Version: `1.2.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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 2026-10-24.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 32/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Licence could not be checked: the licence is shipped as a file inside the package, not declared as a standard (SPDX) licence identifier, so we cannot tell whether it is OSI-approved.
  - Actively maintained (last published 7 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 80/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1486 tokens (~82/item across 18 items; 16 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 85/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 54% 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.
  - All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 18 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the GrowBlocks Dev Kit MCP server?

GrowBlocks Dev Kit runs locally as an npm package, launched with npx -y growblocks. 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 xyz-growblocks-growblocks -- npx -y growblocks
```

### Cursor

```json
{
  "mcpServers": {
    "xyz-growblocks-growblocks": {
      "command": "npx",
      "args": [
        "-y",
        "growblocks"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "xyz-growblocks-growblocks": {
      "command": "npx",
      "args": [
        "-y",
        "growblocks"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add xyz-growblocks-growblocks -- npx -y growblocks
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "xyz-growblocks-growblocks": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "growblocks"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add xyz-growblocks-growblocks --command npx --arg -y --arg growblocks
```

### Hermes

```yaml
mcp_servers:
  xyz-growblocks-growblocks:
    command: "npx"
    args: ["-y", "growblocks"]
```

### Netclaw

```json
{
  "McpServers": {
    "xyz-growblocks-growblocks": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "growblocks"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add xyz-growblocks-growblocks -t stdio -c npx -a -y growblocks
```

### Other

```json
{
  "mcpServers": {
    "xyz-growblocks-growblocks": {
      "command": "npx",
      "args": [
        "-y",
        "growblocks"
      ]
    }
  }
}
```

## 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.

### 2026-10-16 (score 66)

First indexed and scored.

## MCP tools (16)

### `growblocks_docs` (~92 tokens)

Read the Dev Kit API

The GrowBlocks Dev Kit API for writing game.js (llms.txt): the contract, every gb.* call, patterns and pitfalls. Read it before writing game code. Pass topic (e.g. "gb.physics", "gb.net", "Pitfalls") to get one section.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).
- `topic` (string)

### `growblocks_check` (~110 tokens)

Check and play the game

Run the Dev Kit checker on the game folder. play=false: static checks (syntax, unknown gb.* calls, blocked browser APIs, imports, file limits). play=true: also plays the game headless inside GrowBlocks for some seconds, reports every runtime error and returns a screenshot. Run it after every change; fix everything it reports.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).
- `play` (boolean)
- `seconds` (number)

### `growblocks_whoami` (~60 tokens)

Who is signed in

Who the GrowBlocks CLI is signed in as, and how many games they have. Fails with "Not signed in" if login is needed.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_login` (~82 tokens)

Sign in to GrowBlocks

Start signing in to GrowBlocks. Returns a link and a code: give both to the human, who opens the link, checks the code, signs in with Google and presses Allow. The sign-in finishes in the background; check it with growblocks_whoami.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_games` (~62 tokens)

List my games

The signed-in developer's games: status (draft, in review, live, changes needed), test and live builds with their links, and GrowBlocks' review note.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_status` (~58 tokens)

Game status and review note

The status of the game this folder is linked to (growblocks.json): builds, links, review state and note, and what to do next.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_create_game` (~152 tokens)

Create a game on GrowBlocks

Create a new game on GrowBlocks and link the folder to it. address: 3-32 lowercase letters, numbers and dashes (its URL, game.html?g=<address>). Ask the human for the name and address first. A logo (WebP, under 22 KB) and a description are needed before submitting.

Input parameters:

- `address` (string, required)
- `description` (string)
- `dir` (string): The game folder (default: the folder the assistant runs in).
- `logo` (string): Path to a WebP logo.
- `name` (string, required)
- `players` (number): Players per room, 1-16.
- `tagline` (string)

### `growblocks_link_game` (~51 tokens)

Link folder to a game

Link the folder to one of your existing games (writes growblocks.json).

Input parameters:

- `address` (string, required)
- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_update_game` (~110 tokens)

Change game details

Change the linked game's name, tagline, description, studio (the name shown after "by"; empty = the developer's account name), players per room or logo.

Input parameters:

- `description` (string)
- `dir` (string): The game folder (default: the folder the assistant runs in).
- `logo` (string): Path to a WebP logo.
- `name` (string)
- `players` (number)
- `studio` (string)
- `tagline` (string)

### `growblocks_push` (~83 tokens)

Upload a test build

Run the static checks, then upload the folder as a new test build of the linked game. Returns the unlisted test link to play and share. Does not make anything public. At most 20 uploads per game a day, so push when a change is worth testing.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_submit` (~66 tokens)

Submit for review

Submit the latest test build to GrowBlocks for review (needs a logo and a description). Only do this when the human asks: GrowBlocks plays it and approves it or sends a note.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_blocks` (~86 tokens)

Search blocks

Search the GrowBlocks blocks: parts of games other developers published (vehicles, game modes, enemy brains, level kits) that a game can add instead of writing them. Look here before building something common. Pass words to search names, descriptions and tags.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).
- `query` (string)

### `growblocks_block_info` (~62 tokens)

Block details

One block: what it does, its versions (and what it forked), its entry file and which live games use it.

Input parameters:

- `block` (string, required)
- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_add_block` (~128 tokens)

Add a block to the game

Add a block to the game: copies its files into blocks/<slug>/ and records it in growblocks.json. Then import it from ./blocks/<slug>/<entry> and read its code for how to use it. Do not edit the block files: GrowBlocks recognises the block by them and its author earns from the game (paid by GrowBlocks; the game keeps its 70%). To change one, publish a fork.

Input parameters:

- `block` (string, required): slug or slug@version
- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_publish_block` (~85 tokens)

Publish a block publicly

Publish the folder as a block. It needs block.json (slug, name, description, entry, tags, and forkOf if it started from another block). Others can then add it, and its author earns from every live game that ships it. Only when the human asks.

Input parameters:

- `dir` (string): The game folder (default: the folder the assistant runs in).

### `growblocks_new_game` (~65 tokens)

New game folder

Create a new game folder from the latest starter kit (game.js, play.html, check.mjs, llms.txt, gb.d.ts, this CLI and .mcp.json). Then pass that folder as dir to the other tools.

Input parameters:

- `folder` (string, required)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks#diagnostics

## Score history

- 2026-10-24: 66
- 2026-10-23: 66
- 2026-10-22: 66
- 2026-10-21: 66
- 2026-10-20: 66
- 2026-10-19: 66
- 2026-10-18: 66
- 2026-10-17: 66
- 2026-10-16: 66

## Common questions

### What is the GrowBlocks Dev Kit MCP server?

GrowBlocks Dev Kit is an MCP server listed in the public MCP registry as xyz.growblocks/growblocks. Build, play-test with screenshots, and ship three.js browser games on GrowBlocks. This page covers its npm package (growblocks).

### Is the GrowBlocks Dev Kit MCP server safe to use?

GrowBlocks Dev Kit scores 66 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 24 October 2026. It declares no install or post-install scripts. 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 GrowBlocks Dev Kit MCP server expose?

GrowBlocks Dev Kit exposes 16 tools: growblocks_docs, growblocks_check, growblocks_whoami, growblocks_login, growblocks_games, and 11 more. Their descriptions and schemas cost roughly 1,352 tokens of context every time the server is loaded.

### Is the GrowBlocks Dev Kit MCP server still maintained?

GrowBlocks Dev Kit is still listed as active in the MCP registry. We last reached this channel on 24 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- npm package: https://www.npmjs.com/package/growblocks
- Socket report: https://socket.dev/npm/package/growblocks
- Repository: https://github.com/Gioluan/growblocks-devkit
- Website: https://growblocks.xyz/devkit.html
- Changelog RSS feed: https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks.xml
- Changelog JSON feed: https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks.json
- HTML version of this page: https://verifymcp.io/servers/xyz-growblocks-growblocks/growblocks