link_property_expression

Link a layer property to another layer's property via a simple expression (e.g. thisComp.layer('Name').transform.opacity).

SERVERAe SOURCE@synthetic-ai/ae-mcp

Medium RISK CLASS

Category Write

Parameters 74 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/synthetic-ai-ae-mcp/link-property-expression.md

WHAT IT DOES

What link_property_expression does on Ae

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

Parameter	Type	Required	Description
`save`	boolean	—
`compName`	string	Yes
`layerName`	string	Yes
`timeoutMs`	number	—
`projectPath`	string	—
`propertyPath`	array	Yes	Target property path.
`sourceExpression`	string	Yes	Full expression string to set.

Parameters from the server's own tool schema.

RISK

Why link_property_expression is rated Medium

An AI agent can call link_property_expression faster than any human can review: one bad instruction and it creates or modifies resources in Ae by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs link_property_expression safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ae, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For link_property_expression, this is the rule to start with:

link_property_expression Rate-limited

link_property_expression 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": {
    "link_property_expression": {
      "limits": [
        {
          "counter": "link_property_expression_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ae, apply this rule, and every link_property_expression call is checked against it from then on.

FAQ

Questions about link_property_expression

What does the link_property_expression tool do? +

Link a layer property to another layer's property via a simple expression (e.g. thisComp.layer('Name').transform.opacity). It is categorised as a Write tool in the Ae MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does link_property_expression accept? +

link_property_expression accepts 7 parameters: save, compName, layerName, timeoutMs, projectPath, propertyPath, sourceExpression. Required: compName, layerName, propertyPath, sourceExpression. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on link_property_expression? +

Register the Ae MCP server in PolicyLayer and add a rule for link_property_expression: 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 Ae. Nothing to install.

What risk level is link_property_expression? +

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

Can I rate-limit link_property_expression? +

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

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

link_property_expression is provided by the Ae MCP server (@synthetic-ai/ae-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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