Create a new prompt template triggered by a command.
AI agents use create_prompt to create or update resources in Open WebUI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Open WebUI MCP Server environment.
This tool adds a new resource (prompt template) to the Open WebUI system. While it does not modify existing data or delete anything, it does persistently store new configuration/content. The severity is medium because prompt templates could be used to manipulate AI assistant behavior or embed instructions, and if created maliciously within a multi-user admin context, could affect other users.
From the tool's definition Tool creates a new prompt template, which is a data creation operation. Description states 'Create a new prompt template' - the verb 'Create' indicates a write action that adds new data to the system.
Documented attack patterns abuse exactly the kind of access create_prompt gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open WebUI MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_prompt:
{
"version": "1",
"default": "deny",
"tools": {
"create_prompt": {
"limits": [
{
"counter": "create_prompt_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_prompt 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.
Free to start. No card required.
Create a new prompt template triggered by a command. It is categorised as a Write tool in the Open WebUI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Open WebUI MCP Server MCP server in PolicyLayer and add a rule for create_prompt: 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 Open WebUI MCP Server. Nothing to install.
create_prompt 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 create_prompt 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 create_prompt. 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.
create_prompt is provided by the Open WebUI MCP Server MCP server (troylar/open-webui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open WebUI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
82 Open WebUI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.