Watermark PDF — Add text watermark to PDF pages. Runs in the browser. Covered by signup welcome credits and by the Day Pass (24-hour unlimited on this workspace group). All three credit-based workspaces unlock with the same one-time credit pack — there is no per-workspace subscription. See mioffi...
Part of the MiOffice — AI-Powered Workspace Studio server.
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AI agents use mio_pdf_watermark to create or modify resources in MiOffice — AI-Powered Workspace Studio. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call mio_pdf_watermark repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach MiOffice — AI-Powered Workspace Studio.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"mio_pdf_watermark": {
"limits": [
{
"counter": "mio_pdf_watermark_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full MiOffice — AI-Powered Workspace Studio policy for all 133 tools.
These attack patterns abuse exactly the kind of access mio_pdf_watermark gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Watermark PDF — Add text watermark to PDF pages. Runs in the browser. Covered by signup welcome credits and by the Day Pass (24-hour unlimited on this workspace group). All three credit-based workspaces unlock with the same one-time credit pack — there is no per-workspace subscription. See mioffice.ai/pricing for current plans.. It is categorised as a Write tool in the MiOffice — AI-Powered Workspace Studio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MiOffice — AI-Powered Workspace Studio MCP server in PolicyLayer and add a rule for mio_pdf_watermark: 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 MiOffice — AI-Powered Workspace Studio. Nothing to install.
mio_pdf_watermark 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 mio_pdf_watermark 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 mio_pdf_watermark. 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.
mio_pdf_watermark is provided by the MiOffice — AI-Powered Workspace Studio MCP server (https://mioffice.ai/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 133 MiOffice — AI-Powered Workspace Studio tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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