AI agents call get_icons_in_set to retrieve information from Nucleo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns icon data from a local Nucleo SQLite database without side effects. It is a pure retrieval operation with no capability to create, modify, delete, or execute code. The blast radius is minimal—misuse would only result in retrieving icon metadata or lists already available in the local database.
From the tool's definition Tool retrieves icons from a specific icon set without modifying data. Description uses passive query language ('Get all icons belonging to a specific icon set').
Attacks that exploit this kind of access
Get all icons belonging to a specific icon set. It is categorised as a Read tool in the Nucleo MCP Server, which means it retrieves data without modifying state.
Register the Nucleo MCP server in PolicyLayer and add a rule for get_icons_in_set: 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 Nucleo. Nothing to install.
get_icons_in_set 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_icons_in_set 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_icons_in_set. 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_icons_in_set is provided by the Nucleo MCP server (julianallchin/nucleo-mcp). 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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