Canvs
REMOTE · APP.CANVS.IO · SCANNED AUG 3
AI-powered diagrams, mind maps, flowcharts on a free unlimited collaborative whiteboard
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 →
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 (update_elements). 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 Usability80
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1142 tokens (~163/item across 7 items; 6 tools + 1 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 Management27
- Stability observed for 8 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
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
- Supports UI / widget rendering.Pass
Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.
remote · app.canvs.io
claude mcp add --transport http voronkovm-canvs https://app.canvs.io/mcp
[mcp_servers.voronkovm-canvs] url = "https://app.canvs.io/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"voronkovm-canvs": {
"type": "remote",
"url": "https://app.canvs.io/mcp",
"enabled": true
}
}
} openclaw mcp add voronkovm-canvs --url https://app.canvs.io/mcp --transport streamable-http
mcp_servers:
voronkovm-canvs:
url: "https://app.canvs.io/mcp" {
"mcpServers": {
"voronkovm-canvs": {
"type": "http",
"url": "https://app.canvs.io/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.
- 2 Aug 26 +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.
- 31 Jul 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 29 Jul 26 +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.
- 28 Jul 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 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 3 Aug 2026 · Probed https://app.canvs.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=canvs.io | CN=WE1,O=Google Trust Services,C=US | 22 Jul 2026 | 20 Oct 2026 | ECDSA 256 | ECDSA-SHA256 | c6a51b9173278f8d13193d6c1c4efec8 |
| SANs: canvs.io, *.canvs.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
DNSSEC insecure
Validation of app.canvs.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 57355 | 8 | Verified |
| canvs.io. | 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; includeSubDomains; preload |
| x-content-type-options | nosniff |
| referrer-policy | strict-origin-when-cross-origin |
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://app.canvs.io/mcp | Verified | 200 | |
| http (plaintext) | http://app.canvs.io/mcp | HTTPS enforced | 301 | https://app.canvs.io/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.
add_elements Add elements to the board or create a new one ~318
Creates elements on a canvas. Creates a new canvas if room_id is omitted, or adds to the existing canvas if room_id is provided. Use cases: wireframes, UI mockups, freeform illustrations, standalone shapes, and manual layouts that Mermaid does not cover well. For diagrams Mermaid can express, use add_elements_from_mermaid instead. Element types: rectangle, ellipse, diamond, arrow, line, freedraw, text, image. Rich text: the text field supports limited HTML for text elements and rectangle/ellipse/diamond shape labels. Supports the rich-text plugin HTML subset: <b>/<strong>, <i>/<em>, <u>, <br>, <div>/<p>, <ul>/<ol>/<li>, <a href>, <font color>, and <span style="color, background/background-color, font-size, font-family">. Use textAlign for left/center/right alignment; avoid unsupported HTML/CSS. TEXT IN SHAPES: use containerId on text element pointing to shape id. ARROWS: Position at EDGE of source shape. Auto-bound within 30px. Colors: strokeColor, backgroundColor (hex).
| Name | Type | Req | Description |
|---|---|---|---|
| elements | array | yes | Array of element definitions to create |
| room_id | string | — | Room ID of an existing canvas to add to. If the user is continuing a canvas already referenced in this conversation (by room_id, or a URL like ?room=[room_id] or /gdrive?id=[room_id]), pass it here.… |
| Name | Type | Req | Description |
|---|---|---|---|
| appState | object | yes | Canvas app state (viewBackgroundColor, etc.) |
| collabUrl | string | yes | Collaboration server URL for Socket.IO |
| elements | array | yes | All elements currently on the canvas |
| isNew | boolean | yes | Whether a new canvas was created |
| room_id | string | — | Canvas room ID |
| url | string | yes | Canvas room URL |
No examples provided.
add_elements_from_mermaid Create a diagram from Mermaid, or add one to the board ~356
Creates diagram elements from a Mermaid definition. Creates a new canvas if room_id is omitted, or adds to the existing canvas if room_id is provided. Preferred over add_elements for new diagrams and large changes to existing diagrams whenever the content can be represented in Mermaid. Supports: flowchart, graph, flowchart-elk, sequenceDiagram, classDiagram, classDiagram-v2, stateDiagram, stateDiagram-v2, erDiagram, journey, gantt, pie, gitGraph, mindmap, timeline, C4Context, C4Container, C4Component, C4Dynamic, C4Deployment, sankey, sankey-beta, quadrantChart, xychart, xychart-beta, requirement, requirementDiagram, kanban, architecture, block, block-beta, packet, packet-beta, radar-beta, treemap, info. Example: "flowchart TD\n A[Start] --> B{Decision}\n B -->|Yes| C[OK]\n B -->|No| D[Cancel]"
| Name | Type | Req | Description |
|---|---|---|---|
| config | object | — | Optional Mermaid rendering config. flowchart.curve is handled automatically. |
| mermaid | string | yes | Mermaid diagram definition. Prefer converting compatible user requests into Mermaid instead of using add_elements. |
| room_id | string | — | Room ID of an existing canvas to add to. If the user is continuing a canvas already referenced in this conversation (by room_id, or a URL like ?room=[room_id] or /gdrive?id=[room_id]), pass it here.… |
| timeout | number | — | Room lifetime in seconds (default: 3600, max: 86400). Only used when creating new canvas |
| Name | Type | Req | Description |
|---|---|---|---|
| appState | object | yes | Canvas app state (viewBackgroundColor, etc.) |
| collabUrl | string | yes | Collaboration server URL for Socket.IO |
| elements | array | yes | All elements currently on the canvas |
| isNew | boolean | yes | Whether a new canvas was created |
| pendingMermaid | object | — | Mermaid definition pending client-side rendering |
| room_id | string | — | Canvas room ID |
| url | string | yes | Canvas room URL |
No examples provided.
delete_elements Delete elements from the board ~98
Delete elements from a canvas. Requires room_id from a previous Canvs tool result. Pass ids array of element IDs to delete.
| Name | Type | Req | Description |
|---|---|---|---|
| ids | array | yes | Array of element IDs to delete |
| room_id | string | yes | Room ID from a previous Canvs tool result. If you only have a URL, extract it from https://[host]/?room=[room_id] or https://[host]/gdrive?id=[room_id]. |
| Name | Type | Req | Description |
|---|---|---|---|
| appState | object | yes | Canvas app state (viewBackgroundColor, etc.) |
| collabUrl | string | yes | Collaboration server URL for Socket.IO |
| elements | array | yes | All elements currently on the canvas |
| isNew | boolean | yes | Whether a new canvas was created |
| room_id | string | — | Canvas room ID |
| url | string | yes | Canvas room URL |
No examples provided.
get_guide Get whiteboard instructions ~42
Returns guidance on diagram-creation workflow and tool selection: how to choose between Mermaid and manual element creation, and the recommended iteration workflow. Consult before building complex diagrams.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| guide | string | yes | Tool usage instructions text |
No examples provided.
query_elements Find elements on the board ~151
Query elements on a canvas. Requires room_id from a previous Canvs tool result. Returns elements matching optional filters. Use this before update_elements when making small edits to existing diagrams. If no browser has the canvas open, returns an error — ask the user to open the canvas URL in their browser and retry.
| Name | Type | Req | Description |
|---|---|---|---|
| filter | object | — | Additional key-value filters (e.g., {locked: true}) |
| room_id | string | yes | Room ID from a previous Canvs tool result. If you only have a URL, extract it from https://[host]/?room=[room_id] or https://[host]/gdrive?id=[room_id]. |
| type | string | — | Filter by element type |
| Name | Type | Req | Description |
|---|---|---|---|
| count | number | yes | Number of matching elements |
| elements | array | yes | Matching elements |
No examples provided.
update_elements Update elements on the board ~165
Update elements on a canvas. Requires room_id from a previous Canvs tool result. Pass elements array with id and fields to update. IMPORTANT: in each update object ONLY `id` is required; all other fields are optional patch fields. Include ONLY elements that need changes; elements omitted from the request remain unchanged on the board. Prefer this tool for SMALL edits to existing diagrams (rename/move/restyle a few elements), typically after query_elements.
| Name | Type | Req | Description |
|---|---|---|---|
| elements | array | yes | Array of element updates (each must have id) |
| room_id | string | yes | Room ID from a previous Canvs tool result. If you only have a URL, extract it from https://[host]/?room=[room_id] or https://[host]/gdrive?id=[room_id]. |
| Name | Type | Req | Description |
|---|---|---|---|
| appState | object | yes | Canvas app state (viewBackgroundColor, etc.) |
| collabUrl | string | yes | Collaboration server URL for Socket.IO |
| elements | array | yes | All elements currently on the canvas |
| isNew | boolean | yes | Whether a new canvas was created |
| room_id | string | — | Canvas room ID |
| url | string | yes | Canvas room URL |
No examples provided.