// MCP TOOL REFERENCE

set_viewport

Control the canvas viewport (camera). Auto-fit all elements, center on a specific element, or set zoom/scroll directly. Requires the canvas frontend open in a browser.

ServerExcalidraw MCP Server
CategoryExecute

How to control set_viewport ↓

WHAT SET_VIEWPORT ON EXCALIDRAW MCP SERVER DOES

AI agents invoke set_viewport to trigger actions in Excalidraw MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

THE RISK

High Risk

This tool triggers an external operation in a browser (manipulating the viewport/camera of a live canvas), which qualifies as Execute. It doesn't read, write persistent data, or destroy anything, but it actively drives browser-side state changes whose effects depend on the arguments passed (zoom, scroll, centering). Severity is medium since misuse could disorient a user's view but causes no data loss.

From the tool's definition Control the canvas viewport (camera). Auto-fit all elements, center on a specific element, or set zoom/scroll directly. Requires the canvas frontend open in a browser.

Documented attack patterns abuse exactly the kind of access set_viewport gives an agent:

HOW TO CONTROL SET_VIEWPORT

PolicyLayer is an MCP gateway — it sits between your AI agents and Excalidraw MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set_viewport:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_viewport": {
      "limits": [
        {
          "counter": "set_viewport_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

set_viewport stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Excalidraw MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Excalidraw MCP Server tools

Destructive clear_canvas Clear all elements from the canvas Destructive delete_element Delete an Excalidraw element Write snapshot_scene Save a named snapshot of the current canvas state for later restoration Write align_elements Align elements to a specific position Write batch_create_elements Create multiple Excalidraw elements at once. For arrows, use startElementId/endElementId t Write create_element Create a new Excalidraw element. For arrows, use startElementId/endElementId to bind to sh Write create_from_mermaid Convert a Mermaid diagram to Excalidraw elements and render them on the canvas Write distribute_elements Distribute elements evenly

All 26 Excalidraw MCP Server tools →

Execute tools on other servers

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Go deeper

High-risk tools in Excalidraw MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the set_viewport tool do? +

Control the canvas viewport (camera). Auto-fit all elements, center on a specific element, or set zoom/scroll directly. Requires the canvas frontend open in a browser. It is categorised as a Execute tool in the Excalidraw MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_viewport? +

Register the Excalidraw MCP Server MCP server in PolicyLayer and add a rule for set_viewport: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Excalidraw MCP Server. Nothing to install.

What risk level is set_viewport? +

set_viewport is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit set_viewport? +

Yes. Add a rate_limit block to the set_viewport rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block set_viewport completely? +

Set action: deny in the PolicyLayer policy for set_viewport. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides set_viewport? +

set_viewport is provided by the Excalidraw MCP Server MCP server (yctimlin/mcp_excalidraw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Excalidraw MCP Server tool call.

Deterministic rules across all 26 Excalidraw MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN EXCALIDRAW →

Free to start. No card required.

26 Excalidraw MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

set_viewport

// WHAT SET_VIEWPORT ON EXCALIDRAW MCP SERVER DOES

// THE RISK

// HOW TO CONTROL SET_VIEWPORT

// EXPLORE