qr-maker

render_template

Apply saved QR code style presets to new content, using template IDs to maintain brand consistency while allowing optional style overrides for customization.

Instructions

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.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "template_id": "<template_id>",
      "content": "<content>"
    },
    "name": "render_template"
  }
}

Input Schema

Name	Required	Description
`template_id`	Yes	ID of the template to render
`content`	Yes	Data to encode in the QR code (URL, text, etc.)
`format`	No	Output format. Default: png.
`overrides`	No	Optional style overrides to apply on top of the template

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Apr 13, 2026

TDQS

A4.4/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden and does well by disclosing key behaviors: it describes the multi-step process (lookup template, merge overrides, render), specifies the return format ('Returns a public image URL and, for PNG output, an inline base64 image'), and mentions the purpose of overrides. However, it doesn't cover potential error conditions or rate limits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Perfectly structured with three sentences: first states purpose and process, second provides usage guidelines with clear alternative, third explains overrides with example. Every sentence adds essential information with zero waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with no annotations and no output schema, the description does an excellent job covering purpose, usage, and behavior. It explains the return format and provides context about template-based generation. The only minor gap is lack of explicit error handling or performance characteristics.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description adds some value by explaining the relationship between template_id and overrides ('merges any provided overrides on top of the stored style options') and providing an example for overrides ('e.g. foreground color'), but doesn't significantly enhance parameter understanding beyond what the schema already documents.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific action ('Generate a QR code by applying a saved style preset to new content') and distinguishes it from sibling tool 'generate_qr' by emphasizing template reuse. It identifies the resource (QR code) and verb (generate with template) precisely.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states when to use this tool ('Use this instead of generate_qr when the user has a saved brand style they want to reuse') and provides guidance on when to use overrides ('Use overrides to tweak individual properties without changing the saved preset'). Clear alternative tool is named.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.