Change the destination URL of a QR code without touching the printed image. Print once, redirect anywhere — forever. Accepts either the internal qr_code_id or the short_code from the redirect URL. On success the result is a pre-formatted markdown table — display it exactly as received, do not ref...
Part of the QrVerloz server.
Free to start. No card required.
AI agents use update_qr_target to create or modify resources in QrVerloz. 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 update_qr_target 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 QrVerloz.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"update_qr_target": {
"limits": [
{
"counter": "update_qr_target_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full QrVerloz policy for all 8 tools.
These attack patterns abuse exactly the kind of access update_qr_target 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.
Change the destination URL of a QR code without touching the printed image. Print once, redirect anywhere — forever. Accepts either the internal qr_code_id or the short_code from the redirect URL. On success the result is a pre-formatted markdown table — display it exactly as received, do not reformat or summarise. Requires authentication.. It is categorised as a Write tool in the QrVerloz MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the QrVerloz MCP server in PolicyLayer and add a rule for update_qr_target: 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 QrVerloz. Nothing to install.
update_qr_target 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 update_qr_target 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 update_qr_target. 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.
update_qr_target is provided by the QrVerloz MCP server (https://qrverloz.com/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 8 QrVerloz tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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