Set a single property on an instance. Args: - path (string): Instance path - property (string): Property name - value (any): Value to set (supports strings, numbers, booleans, arrays for Vector3/Color3) Returns: Confirmation with old and new values.
AI agents use set_property to create or update resources in Melo — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Melo environment.
set_property creates or modifies data on a Roblox instance without permanent deletion. The operation is reversible—a subsequent set_property call can restore the previous value (old value is returned). While it could impact game behavior if properties are set incorrectly (e.g., disabling safety mechanisms), it remains a Write-category tool.
From the tool's definition Tool description states "Set a single property on an instance" with arguments to modify an instance's property and returns confirmation of old and new values. This is a reversible modification operation.
Attacks that exploit this kind of access
Set a single property on an instance. Args: - path (string): Instance path - property (string): Property name - value (any): Value to set (supports strings, numbers, booleans, arrays for Vector3/Color3) Returns: Confirmation with old and new values. It is categorised as a Write tool in the Melo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Melo MCP server in PolicyLayer and add a rule for set_property: 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 Melo. Nothing to install.
set_property is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_property 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.
Set action: deny in the PolicyLayer policy for set_property. 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.
set_property is provided by the Melo MCP server (yannyhl/linkedsword-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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