# canvas

Capture or render canvas content from a paired node

Agent View of the PolicyLayer registry record for `canvas`. HTML page: https://policylayer.com/tools/openclaw/canvas

## Facts

- Tool: `canvas`
- Server: OpenClaw (`openclaw`) — https://policylayer.com/tools/openclaw.md
- Install: `npx -y openclaw`
- Homepage: https://www.npmjs.com/package/openclaw
- Risk category: Read (Low risk)
- Registry record: grade F, identity verified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "canvas",
    "arguments": {}
  }
}
```

## Why canvas is rated Low

The tool captures or renders canvas content, which primarily suggests a read/retrieval operation. However, 'render' could imply triggering a computation or side effect. The description is sparse and the server has no overall description, lowering confidence. Classified as Read at medium severity since canvas content could include sensitive visual data.

From the tool's own definition: "'Capture or render canvas content from a paired node' — 'capture' suggests reading/retrieving content; 'render' is ambiguous but likely implies displaying/retrieving visual output"

## Use case

AI agents call canvas to retrieve information from OpenClaw without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches OpenClaw:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "canvas": {}
  }
}
```

## Other tools on OpenClaw (128)

- `drop` — Destructive — https://policylayer.com/tools/openclaw/drop.md
- `reset` — Destructive — https://policylayer.com/tools/openclaw/reset.md
- `uninstall` — Destructive — https://policylayer.com/tools/openclaw/uninstall.md
- `abort` — Execute — https://policylayer.com/tools/openclaw/abort.md
- `acp` — Execute — https://policylayer.com/tools/openclaw/acp.md
- `action` — Execute — https://policylayer.com/tools/openclaw/action.md
- `agent` — Execute — https://policylayer.com/tools/openclaw/agent.md
- `auth` — Execute — https://policylayer.com/tools/openclaw/auth.md
- `bash` — Execute — https://policylayer.com/tools/openclaw/bash.md
- `browser` — Execute — https://policylayer.com/tools/openclaw/browser.md
- `capability` — Execute — https://policylayer.com/tools/openclaw/capability.md
- `chat` — Execute — https://policylayer.com/tools/openclaw/chat.md
- `command` — Execute — https://policylayer.com/tools/openclaw/command.md
- `completion` — Execute — https://policylayer.com/tools/openclaw/completion.md
- `crestodian` — Execute — https://policylayer.com/tools/openclaw/crestodian.md
- `cron` — Execute — https://policylayer.com/tools/openclaw/cron.md
- `daemon` — Execute — https://policylayer.com/tools/openclaw/daemon.md
- `doctor` — Execute — https://policylayer.com/tools/openclaw/doctor.md
- `elevated` — Execute — https://policylayer.com/tools/openclaw/elevated.md
- `events_wait` — Execute — https://policylayer.com/tools/openclaw/events-wait.md
- `gateway` — Execute — https://policylayer.com/tools/openclaw/gateway.md
- `infer` — Execute — https://policylayer.com/tools/openclaw/infer.md
- `new` — Execute — https://policylayer.com/tools/openclaw/new.md
- `node` — Execute — https://policylayer.com/tools/openclaw/node.md
- `nodes` — Execute — https://policylayer.com/tools/openclaw/nodes.md
- `permissions_respond` — Execute — https://policylayer.com/tools/openclaw/permissions-respond.md
- `phone` — Execute — https://policylayer.com/tools/openclaw/phone.md
- `plugins` — Execute — https://policylayer.com/tools/openclaw/plugins.md
- `proxy` — Execute — https://policylayer.com/tools/openclaw/proxy.md
- `qa` — Execute — https://policylayer.com/tools/openclaw/qa.md
- …and 98 more: https://policylayer.com/tools/openclaw.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=openclaw · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/openclaw