affinity_add_layer · Affinity MCP Server MCP: Risk & Policy

WHAT IT DOES

What affinity_add_layer does on Affinity MCP Server

AI agents use affinity_add_layer to create or update resources in Affinity MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Affinity MCP Server environment.

WHY IT NEEDS A POLICY

Why affinity_add_layer needs a policy

Creating a layer in a design document is a Write operation—it modifies the document state by adding a new element that can be undone. It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or merely read data (Read).

From the tool's definition Tool adds a new layer to an Affinity document (pixel, mask, adjustment, live filter, fill, pattern), which creates new data structures within the design project. This is a reversible modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

affinity_add_layer Rate-limited

affinity_add_layer stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "affinity_add_layer": {
      "limits": [
        {
          "counter": "affinity_add_layer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Affinity MCP Server, so you can run agents against it safely.

FAQ

Questions about affinity_add_layer

What does the affinity_add_layer tool do? +

Add a new layer (pixel, mask, adjustment, live filter, fill, pattern). It is categorised as a Write tool in the Affinity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on affinity_add_layer? +

Register the Affinity MCP Server MCP server in PolicyLayer and add a rule for affinity_add_layer: 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 Affinity MCP Server. Nothing to install.

What risk level is affinity_add_layer? +

affinity_add_layer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit affinity_add_layer? +

Yes. Add a rate_limit block to the affinity_add_layer 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 affinity_add_layer completely? +

Set action: deny in the PolicyLayer policy for affinity_add_layer. 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 affinity_add_layer? +

affinity_add_layer is provided by the Affinity MCP Server MCP server (sekharmalla/affinity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.