AI agents call resmea_list_standard_types to retrieve information from GBMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and enumerates available standard-type filter values from the RESMEA metrology system. This is a read-only operation that provides information for filtering purposes, with no capacity to modify data, execute code, or trigger external side effects. The blast radius of misuse is minimal—an agent could only retrieve organizational metadata about available standard types.
From the tool's definition Tool name contains 'list' and description states 'List RESMEA metrology standard-type filter values' — this is a straightforward query operation that retrieves metadata without modification or side effects.
Attacks that exploit this kind of access
List RESMEA metrology standard-type filter values. It is categorised as a Read tool in the GBMCP MCP Server, which means it retrieves data without modifying state.
Register the GB MCP server in PolicyLayer and add a rule for resmea_list_standard_types: 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 GBMCP. Nothing to install.
resmea_list_standard_types 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 resmea_list_standard_types 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 resmea_list_standard_types. 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.
resmea_list_standard_types is provided by the GB MCP server (loydgik/gbmcp). 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.
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