Manage saved screenshots: list, cleanup, or change the rolling cap.
AI agents use manage_screenshots to create or update resources in Openowl — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Openowl environment.
This tool modifies screenshot storage configuration and can delete cached screenshot files. Deletion of cached screenshots is reversible in practice (new screenshots can be captured) and affects only temporary system artifacts, not critical user data. The core capability is write/management of system state (screenshot file storage) rather than destructive action on irreplaceable data.
From the tool's definition The tool description states it can 'manage saved screenshots: list, cleanup, or change the rolling cap.' The operations include listing (read), cleanup (deletion of screenshots), and configuration changes (setting a rolling cap).
Documented attack patterns abuse exactly the kind of access manage_screenshots gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Openowl, and nothing reaches the server without passing your rules. This is the rule we recommend for manage_screenshots:
{
"version": "1",
"default": "deny",
"tools": {
"manage_screenshots": {
"limits": [
{
"counter": "manage_screenshots_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}manage_screenshots 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.
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Manage saved screenshots: list, cleanup, or change the rolling cap. It is categorised as a Write tool in the Openowl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Openowl MCP server in PolicyLayer and add a rule for manage_screenshots: 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 Openowl. Nothing to install.
manage_screenshots 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 manage_screenshots 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 manage_screenshots. 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.
manage_screenshots is provided by the Openowl MCP server (mihir-kanzariya/openowl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Openowl, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
40 Openowl tools catalogued and risk-classified — across an index of 43,000+ MCP servers.