AI agents use generate_flow to create or update resources in Kestra Python MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Kestra Python MCP Server environment.
Without a description, classification relies on naming convention and server context. 'Generate' most likely means creating a new workflow flow, which is a reversible write operation. Confidence is moderate (0.7) due to empty description; if the tool actually executes generated flows or modifies existing ones, severity could escalate to high.
From the tool's definition Tool named 'generate_flow' with no description provided. Based on sibling tools on the server (create_flow_from_yaml, execute_flow, delete_flow_logs), this server manages Kestra workflows.
Documented attack patterns abuse exactly the kind of access generate_flow gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kestra Python MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_flow:
{
"version": "1",
"default": "deny",
"tools": {
"generate_flow": {
"limits": [
{
"counter": "generate_flow_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}generate_flow 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_flow. It is categorised as a Write tool in the Kestra Python MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Kestra Python MCP Server MCP server in PolicyLayer and add a rule for generate_flow: 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 Kestra Python MCP Server. Nothing to install.
generate_flow 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_flow 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_flow. 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_flow is provided by the Kestra Python MCP Server MCP server (kestra-io/mcp-server-python). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kestra Python MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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39 Kestra Python MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.