Update Cypher filter for visualization. Empty string clears filter.
AI agents use update_visualization_filter to create or update resources in Mcp Graph Engine — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Graph Engine environment.
This tool modifies visualization filter settings, which is a write operation (reversible data/configuration change). It does not execute arbitrary queries, delete data, or perform destructive operations. The scope is limited to visualization preferences rather than the underlying graph data, making it lower severity than other tools on this server like cypher_query (Execute) or delete_graph (Destructive).
From the tool's definition Tool name 'update_visualization_filter' and description 'Update Cypher filter for visualization' indicate modification of visualization settings; the mention of clearing filters with empty strings confirms reversible state changes.
Documented attack patterns abuse exactly the kind of access update_visualization_filter gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Graph Engine, and nothing reaches the server without passing your rules. This is the rule we recommend for update_visualization_filter:
{
"version": "1",
"default": "deny",
"tools": {
"update_visualization_filter": {
"limits": [
{
"counter": "update_visualization_filter_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_visualization_filter 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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Update Cypher filter for visualization. Empty string clears filter. It is categorised as a Write tool in the Mcp Graph Engine MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Graph Engine MCP server in PolicyLayer and add a rule for update_visualization_filter: 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 Mcp Graph Engine. Nothing to install.
update_visualization_filter 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 update_visualization_filter 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 update_visualization_filter. 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.
update_visualization_filter is provided by the Mcp Graph Engine MCP server (utilitydelta/mcp-graph-engine). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Graph Engine, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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24 Mcp Graph Engine tools catalogued and risk-classified — across an index of 43,000+ MCP servers.