AI agents use create_source to create or update resources in ParaView-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ParaView-MCP environment.
This tool creates new geometric sources in ParaView's visualization pipeline. Creation of new objects is a Write operation—it modifies the visualization state and pipeline but does not irreversibly delete data or execute arbitrary external code.
From the tool's definition Tool name 'create_source' and description 'Create a new geometric source' indicate creation of new visualization objects in ParaView, which modifies the visualization state but is reversible (can be undone/deleted).
Documented attack patterns abuse exactly the kind of access create_source gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ParaView-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for create_source:
{
"version": "1",
"default": "deny",
"tools": {
"create_source": {
"limits": [
{
"counter": "create_source_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_source 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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Create a new geometric source. It is categorised as a Write tool in the ParaView-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the ParaView- MCP server in PolicyLayer and add a rule for create_source: 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 ParaView-MCP. Nothing to install.
create_source 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_source 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_source. 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_source is provided by the ParaView- MCP server (llnl/paraview_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ParaView-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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23 ParaView-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.