Velven
REMOTE · MCP.VELVEN.AI · SCANNED SEP 29
Publish browser games, worlds, tools and wonders built with AI to Velven's hosting, and manage them.
Available components
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. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (rollback). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability66
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management3
- Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
remote · mcp.velven.ai
claude mcp add --transport http velvenai-velven 'https://mcp.velven.ai/mcp'
{
"mcpServers": {
"velvenai-velven": {
"url": "https://mcp.velven.ai/mcp"
}
}
} {
"servers": {
"velvenai-velven": {
"type": "http",
"url": "https://mcp.velven.ai/mcp"
}
}
} [mcp_servers.velvenai-velven] url = "https://mcp.velven.ai/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"velvenai-velven": {
"type": "remote",
"url": "https://mcp.velven.ai/mcp",
"enabled": true
}
}
} openclaw mcp add velvenai-velven --url 'https://mcp.velven.ai/mcp' --transport streamable-http
mcp_servers:
velvenai-velven:
url: "https://mcp.velven.ai/mcp" {
"McpServers": {
"velvenai-velven": {
"Transport": "http",
"Url": "https://mcp.velven.ai/mcp"
}
}
} assistant mcp add velvenai-velven -t streamable-http -u 'https://mcp.velven.ai/mcp'
{
"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.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 29 Sept 26 0
- 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 security
- Schema quality: 216 → 260 ▼ functional
- Stability: unverified → 0.03 ▲ functional
- “publish” added an optional parameter “clip” cosmetic
- “publish” added an optional parameter “thumbnail” cosmetic
- “publish” reworded the description of “prod” cosmetic
- 28 Sept 26 66
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 29 Sept 2026 · Probed https://mcp.velven.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=mcp.velven.ai | CN=YR1,O=Let's Encrypt,C=US | 28 Sept 2026 | 27 Dec 2026 | RSA 2048 | SHA256-RSA | 6468db52572bf64c0f99558a55644567e00 |
| SANs: mcp.velven.ai | ||||||
| CN=YR1,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | a20253f15f2691c05dc1ce13b9bcca4e |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.velven.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 3799 | 8 | Verified |
| velven.ai. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| content-security-policy | frame-ancestors 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.velven.ai/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.velven.ai/mcp | HTTPS enforced | 308 | https://mcp.velven.ai/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
my_spaces Your spaces ~55
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.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| handle | string | yes | – |
| spaces | array | yes | – |
No examples provided.
publish Publish a space ~662
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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 | yes | The space's slug. |
| status | string | yes | 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 | yes | The version this publish made. |
| watchUrl | string | – | Where to follow the version on Velven. |
No examples provided.
rollback Roll back a space ~86
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.
| Name | Type | Req | Description |
|---|---|---|---|
| space | string | yes | The space's slug, as my_spaces or publish named it, e.g. pixel-racer. |
| version | integer | yes | The version number to make live again. |
| Name | Type | Req | Description |
|---|---|---|---|
| pageUrl | string | yes | – |
| status | string | yes | – |
| version | object | yes | – |
No examples provided.
search_docs Search Velven's docs ~90
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.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | How many sections to return. Default 5. |
| query | string | yes | What to look up, in a few words. |
| Name | Type | Req | Description |
|---|---|---|---|
| query | string | yes | – |
| results | array | yes | – |
No examples provided.
versions Versions of a space ~84
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.
| Name | Type | Req | Description |
|---|---|---|---|
| space | string | yes | The space's slug, as my_spaces or publish named it, e.g. pixel-racer. |
| Name | Type | Req | Description |
|---|---|---|---|
| space | string | yes | – |
| versions | array | yes | – |
No examples provided.
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.