# Velven (remote · mcp.velven.ai)

Publish browser games, worlds, tools and wonders built with AI to Velven's hosting, and manage them.

- Trust score: 66/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-29

## Components

- remote · `mcp.velven.ai`: 66/100 (this document), [markdown](https://verifymcp.io/servers/velvenai-velven/mcp.md), [page](https://verifymcp.io/servers/velvenai-velven/mcp)

## Channel facts

- Endpoint: `https://mcp.velven.ai/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.1`

## 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 2026-09-29.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (rollback).
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1304 tokens (~260/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **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 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

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

Velven is a hosted endpoint at https://mcp.velven.ai/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 velvenai-velven 'https://mcp.velven.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "velvenai-velven": {
      "url": "https://mcp.velven.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "velvenai-velven": {
      "type": "http",
      "url": "https://mcp.velven.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.velvenai-velven]
url = "https://mcp.velven.ai/mcp"
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add velvenai-velven --url 'https://mcp.velven.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  velvenai-velven:
    url: "https://mcp.velven.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "velvenai-velven": {
      "Transport": "http",
      "Url": "https://mcp.velven.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add velvenai-velven -t streamable-http -u 'https://mcp.velven.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "velvenai-velven": {
      "type": "http",
      "url": "https://mcp.velven.ai/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.

### 2026-09-29 (score 66, 0)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “publish” rewrote its description, which is the text the model reads
- [security] Tool “rollback” rewrote its description, which is the text the model reads
- [security] Tool “versions” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 216 → 260
- [functional improvement] Stability: unverified → 0.03
- [cosmetic] “publish” added an optional parameter “clip”
- [cosmetic] “publish” added an optional parameter “thumbnail”
- [cosmetic] “publish” reworded the description of “prod”

### 2026-09-28 (score 66)

First indexed and scored.

## MCP tools (5)

### `publish` (~662 tokens)

Publish a space

Publish a browser game, world, tool or wonder on Velven's hosting, from one HTML page or a small set of files (3 MB in all). Signed in: a private preview by default, or with prod: true the next live version, live on its Velven page within seconds. Not signed in: an unlisted page, live the same way, returned with a claim token that keeps it. A new space needs title, type and devices from the person. To update a space pass space (signed in) or claim (not signed in).

Input parameters:

- `claim` (string): The claim token of an unlisted page: publishes its next version, or claims it when signed in.
- `clip` (string): The video the tile plays on hover, without sound. Give the path of one of the files sent: an MP4 or WebM, up to 3 MB and 5 to 10 seconds long. Velven then records no clip of its own. Without a thumbn…
- `description` (string): One line under the name.
- `devices` (array): Where it can be played. Required for a new space.
- `engine` (string): What it draws with, if one of these.
- `entry` (string): The page that opens first, if not index.html.
- `files` (object): Files by relative path: text as a string, binary as { "base64": "..." }. Must include the entry page (index.html unless entry says otherwise). A velven.json, a dotfile, a dot-folder or node_modules,…
- `how_made` (string): How it was made, in the creator's words.
- `html` (string): A whole page as one HTML string, published as index.html.
- `prod` (boolean): Go live on the space's Velven page instead of making a preview. Signed in only. Default false.
- `sdk` (boolean): Add Velven's SDK script to the entry page. Default true.
- `spa` (boolean): Serve the entry page for any unknown path (a single-page app).
- `space` (string): Publish a new version of this space (yours, signed in).
- `thumbnail` (string): The picture on the space's tile. Give the path of one of the files sent: a JPEG, PNG or WebP, up to 2 MB and 4096 pixels on each side. It's used as soon as the version is live, and Velven takes no pi…
- `title` (string): The space's name. Required for a new space.
- `type` (string): What it is. Required for a new space.

Output parameters:

- `claimToken` (string): The unlisted page's claim token, shown once (no account).
- `claimUrl` (string): Open signed in to claim the page (no account).
- `expiresAt` (string|null): When an unlisted page is deleted unless claimed (no account).
- `leftOut` (array): Files not published (velven.json, dotfiles, node_modules), the first 10.
- `leftOutCount` (integer): How many files were left out in all.
- `pageUrl` (string): The space's page on Velven.
- `previewUrl` (string): The private preview, for 24 hours (a preview only).
- `reason` (string): Why it was refused, naming the file when it was one.
- `space` (string): The space's slug.
- `status` (string): The version's status: preview, publishing (waiting on Velven to publish it), live or refused.
- `terms` (string): The Terms line to show the person (no account).
- `version` (integer): The version this publish made.
- `watchUrl` (string): Where to follow the version on Velven.

### `my_spaces` (~55 tokens)

Your spaces

List the spaces of the signed-in Velven account: slug, title, status, whether Velven hosts it, and its page. Needs sign-in; called without it, the app asks the person to sign in to Velven.

Output parameters:

- `handle` (string)
- `spaces` (array)

### `versions` (~84 tokens)

Versions of a space

List a hosted space's versions, newest first: number, status (uploading, preview, publishing, live, refused, unjudged, replaced), size, and whether rollback can pick it. Refused versions carry the reason. Needs sign-in.

Input parameters:

- `space` (string, required): The space's slug, as my_spaces or publish named it, e.g. pixel-racer.

Output parameters:

- `space` (string)
- `versions` (array)

### `rollback` (~86 tokens)

Roll back a space

Make an earlier version of a hosted space live again. Only a version that was live before (rollback: true in versions) can be picked; it goes live at once. Needs sign-in.

Input parameters:

- `space` (string, required): The space's slug, as my_spaces or publish named it, e.g. pixel-racer.
- `version` (integer, required): The version number to make live again.

Output parameters:

- `pageUrl` (string)
- `status` (string)
- `version` (object)

### `search_docs` (~90 tokens)

Search Velven's docs

Search Velven's documentation: publishing and hosting, velven.json, the CLI, the SDK (sign-in, leaderboards, saves, achievements, rooms), claiming a page, the agent API and limits. Returns the best matching sections with links.

Input parameters:

- `limit` (integer): How many sections to return. Default 5.
- `query` (string, required): What to look up, in a few words.

Output parameters:

- `query` (string)
- `results` (array)

## Diagnostics

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

## Score history

- 2026-09-29: 66
- 2026-09-28: 66

## Common questions

### What is the Velven MCP server?

Velven is an MCP server listed in the public MCP registry as io.github.velvenai/velven. Publish browser games, worlds, tools and wonders built with AI to Velven's hosting, and manage them. This page covers its hosted endpoint (https://mcp.velven.ai/mcp).

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

Velven scores 66 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 Velven MCP server expose?

Velven exposes 5 tools: publish, my_spaces, versions, rollback, search_docs. Their descriptions and schemas cost roughly 977 tokens of context every time the server is loaded.

### Does the Velven MCP server require authentication?

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

### Is the Velven MCP server still maintained?

Velven is still listed as active in the MCP registry. We last reached this channel on 29 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://mcp.velven.ai/mcp
- Repository: https://github.com/velvenai/skills
- Website: https://velven.ai/docs
- Changelog RSS feed: https://verifymcp.io/servers/velvenai-velven/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/velvenai-velven/mcp.json
- HTML version of this page: https://verifymcp.io/servers/velvenai-velven/mcp