AI agents use generate_qr_code to create or update resources in Daraja MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Daraja MCP environment.
The tool generates QR codes, which are data outputs (Write category). While the description is empty, lowering confidence, the sibling tools (create_destination, create_source, create_workflow, run_workflow, stk_push) indicate this server handles financial workflows. QR codes in M-Pesa contexts often encode payment instructions or transaction metadata.
From the tool's definition Tool named 'generate_qr_code' with empty description. Context suggests integration with Safaricom's Daraja API and M-Pesa financial services. QR code generation typically creates new data artifacts.
Documented attack patterns abuse exactly the kind of access generate_qr_code gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Daraja MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_qr_code:
{
"version": "1",
"default": "deny",
"tools": {
"generate_qr_code": {
"limits": [
{
"counter": "generate_qr_code_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_qr_code stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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generate_qr_code. It is categorised as a Write tool in the Daraja MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Daraja MCP server in PolicyLayer and add a rule for generate_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 Daraja MCP. Nothing to install.
generate_qr_code 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 generate_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.
Set action: deny in the PolicyLayer policy for generate_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.
generate_qr_code is provided by the Daraja MCP server (jameskanyiri/darajamcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Daraja MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 Daraja MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.