decode_qr_code

Decode QR code from image file

SERVERContextForge MCP Gateway SOURCEjrmatherly/mcp-context-forge

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/jrmatherly-mcp-context-forge/decode-qr-code.md

WHAT IT DOES

What decode_qr_code does on ContextForge MCP Gateway

AI agents call decode_qr_code to retrieve information from ContextForge MCP Gateway without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why decode_qr_code is rated Low

This tool retrieves and parses data (QR code content) from an image file. It performs no data creation, modification, deletion, code execution, or financial operations. The operation is passive and non-destructive, with no external effects beyond returning decoded information. Severity is low because even if misused, decoding a QR code cannot harm systems or data—it merely extracts publicly-visible information.

From the tool's definition Tool name 'decode_qr_code' and description 'Decode QR code from image file' indicate a read-only operation that extracts information from an image without modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs decode_qr_code safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ContextForge MCP Gateway, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For decode_qr_code, this is the rule to start with:

decode_qr_code Allowed

decode_qr_code is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "decode_qr_code": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ContextForge MCP Gateway, apply this rule, and every decode_qr_code call is checked against it from then on.

FAQ

Questions about decode_qr_code

What does the decode_qr_code tool do? +

Decode QR code from image file. It is categorised as a Read tool in the ContextForge MCP Gateway MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on decode_qr_code? +

Register the ContextForge MCP Gateway MCP server in PolicyLayer and add a rule for decode_qr_code: 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 ContextForge MCP Gateway. Nothing to install.

What risk level is decode_qr_code? +

decode_qr_code is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit decode_qr_code? +

Yes. Add a rate_limit block to the decode_qr_code 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.

How do I block decode_qr_code completely? +

Set action: deny in the PolicyLayer policy for decode_qr_code. 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.

What MCP server provides decode_qr_code? +

decode_qr_code is provided by the ContextForge MCP Gateway MCP server (jrmatherly/mcp-context-forge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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