AI agents call gva_count to retrieve information from MCP4GVA without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read-only operation that counts features based on filtering criteria. Even though it accepts a WHERE clause for filtering, it only returns a count result and has no side effects on the underlying data. This is a retrieval/query operation typical of Read category tools.
From the tool's definition Tool name is 'gva_count' and description states it 'Count features matching a WHERE clause' — this is a query operation that retrieves aggregate data without modification or deletion.
Attacks that exploit this kind of access
Count features matching a WHERE clause. It is categorised as a Read tool in the MCP4GVA MCP Server, which means it retrieves data without modifying state.
Register the MCP4GVA MCP server in PolicyLayer and add a rule for gva_count: 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 MCP4GVA. Nothing to install.
gva_count is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the gva_count 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 gva_count. 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.
gva_count is provided by the MCP4GVA MCP server (pepo1275/mcp4gva). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →