AI agents use set-element-version-prevent-cleanup to create or update resources in Mcp Dev — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Dev environment.
This tool modifies configuration or metadata for an element version by setting a cleanup prevention flag. It does not delete data (would be Destructive), execute arbitrary commands (would be Execute), or create new objects (Write is more appropriate than Create since it modifies existing state). The action is reversible—cleanup prevention can be toggled off.
From the tool's definition Tool name contains 'set-' and description states 'Prevent cleanup for a specific element version', indicating modification of element version settings/state.
Attacks that exploit this kind of access
Prevent cleanup for a specific element version. It is categorised as a Write tool in the Mcp Dev MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Dev MCP server in PolicyLayer and add a rule for set-element-version-prevent-cleanup: 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 Mcp Dev. Nothing to install.
set-element-version-prevent-cleanup 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-element-version-prevent-cleanup 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-element-version-prevent-cleanup. 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-element-version-prevent-cleanup is provided by the Mcp Dev MCP server (@umbraco-cms/mcp-dev). 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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