AI agents call get_pharo_metric to retrieve information from Pharo Nc without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the description being empty, the naming convention and context of sibling tools strongly suggest this is a Read operation that queries Pharo system metrics. The 'get_' prefix and the pattern of similar tools on this server indicate data retrieval with no side effects.
From the tool's definition Tool name 'get_pharo_metric' uses the 'get_' prefix pattern, indicating data retrieval. Sibling tools on the server (get_class_comment, get_class_definition, get_method_list) are consistently Read operations that retrieve system information without…
Attacks that exploit this kind of access
get_pharo_metric. It is categorised as a Read tool in the Pharo Nc MCP Server, which means it retrieves data without modifying state.
Register the Pharo Nc MCP server in PolicyLayer and add a rule for get_pharo_metric: 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 Pharo Nc. Nothing to install.
get_pharo_metric 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 get_pharo_metric 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 get_pharo_metric. 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.
get_pharo_metric is provided by the Pharo Nc MCP server (mumez/pharo-nc-mcp-server). 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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