Generate a QR code by applying a saved style preset to new content. Looks up the template by ID, merges any provided overrides on top of the stored style options, then renders the QR code. Returns a public image URL and, for PNG output, an inline base64 image. Use this instead of generate_qr when...
Risk signalsAccepts raw HTML/template content (content)
Part of the Qr Maker server.
Free to start. No card required.
AI agents use render_template to create or modify resources in Qr Maker. 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 render_template 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 Qr Maker.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"render_template": {
"limits": [
{
"counter": "render_template_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Qr Maker policy for all 19 tools.
These attack patterns abuse exactly the kind of access render_template 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.
Generate a QR code by applying a saved style preset to new content. Looks up the template by ID, merges any provided overrides on top of the stored style options, then renders the QR code. Returns a public image URL and, for PNG output, an inline base64 image. Use this instead of generate_qr when the user has a saved brand style they want to reuse — avoids re-specifying all style options each time. Use overrides to tweak individual properties (e.g. foreground color) without changing the saved preset.. It is categorised as a Write tool in the Qr Maker MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Qr Maker MCP server in PolicyLayer and add a rule for render_template: 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 Qr Maker. Nothing to install.
render_template 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 render_template 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 render_template. 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.
render_template is provided by the Qr Maker MCP server (@qr-maker/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Qr Maker tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.