AI agents call samr_get_standard_sample 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.
This tool performs a simple retrieval operation on reference material metadata. It queries and returns existing data without modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an agent could only retrieve metadata that is presumably already public. This is a standard Read classification.
From the tool's definition Tool name contains 'get', description states 'Get' a reference-material detail by id or URL. No write, delete, execute, or financial operations are indicated. The tool retrieves metadata about GSB (national standard) reference materials.
Attacks that exploit this kind of access
Get 国家标准样品 / GSB reference-material detail by id or GSM detail URL. 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 samr_get_standard_sample: 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.
samr_get_standard_sample 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 samr_get_standard_sample 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 samr_get_standard_sample. 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.
samr_get_standard_sample 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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