AI agents use add_vector_layer to create or update resources in QGIS MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your QGIS MCP Server environment.
This tool modifies the QGIS project state by adding a vector layer, which is a reversible operation (layers can be removed). It does not execute arbitrary code, delete data, or cause financial impact. The severity is medium because improper use could add malicious or incorrect layers to a project, potentially corrupting analysis or visualizations, but the effect is recoverable.
From the tool's definition Tool name 'add_vector_layer' and description 'Add a vector layer to the project' indicate creation/modification of project data by adding a new layer.
Documented attack patterns abuse exactly the kind of access add_vector_layer gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and QGIS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_vector_layer:
{
"version": "1",
"default": "deny",
"tools": {
"add_vector_layer": {
"limits": [
{
"counter": "add_vector_layer_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_vector_layer 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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Add a vector layer to the project. It is categorised as a Write tool in the QGIS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the QGIS MCP Server MCP server in PolicyLayer and add a rule for add_vector_layer: 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 QGIS MCP Server. Nothing to install.
add_vector_layer 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 add_vector_layer 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 add_vector_layer. 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.
add_vector_layer is provided by the QGIS MCP Server MCP server (jjsantos01/qgis_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from QGIS 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.
15 QGIS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.