AI agents call is_beam_blanked to retrieve information from mcpXL30 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to query whether the electron beam is currently blanked (turned off), which is a non-destructive information retrieval operation. It has no side effects and does not modify microscope state. While the description is empty, the naming pattern and context from similar tools on the same server strongly suggest this is a status-checking (Read) operation.
From the tool's definition Tool name 'is_beam_blanked' indicates a status query operation. The naming convention (is_*) suggests checking the state of the beam blanking mechanism.
Attacks that exploit this kind of access
is_beam_blanked. It is categorised as a Read tool in the mcpXL30 MCP Server, which means it retrieves data without modifying state.
Register the mcpXL30 MCP server in PolicyLayer and add a rule for is_beam_blanked: 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 mcpXL30. Nothing to install.
is_beam_blanked 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 is_beam_blanked 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 is_beam_blanked. 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.
is_beam_blanked is provided by the mcpXL30 MCP server (tspspi/mcpxl30). 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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