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...
Accepts raw HTML/template content (content); Single-target operation
Part of the Qr Maker MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
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. Intercept'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.
tools:
render_template:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Qr Maker policy for all 19 tools.
Agents calling write-class tools like render_template have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
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.
Add a rule in your Intercept YAML policy under the tools section for render_template. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Qr Maker MCP server.
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 Intercept 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 Intercept 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). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept