AI agents call get_frame_count to retrieve information from Vmd without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query to retrieve the frame count for a molecule. It has no side effects, does not modify data, does not execute code or commands, and does not delete or move data. The operation is purely informational, making it a straightforward Read category tool with low severity risk.
From the tool's definition Tool name 'get_frame_count' and description 'Return the number of trajectory frames loaded for a given molecule' indicate a query operation that retrieves metadata about loaded molecular dynamics trajectories without modifying or executing any operations.
Attacks that exploit this kind of access
Return the number of trajectory frames loaded for a given molecule. It is categorised as a Read tool in the Vmd MCP Server, which means it retrieves data without modifying state.
Register the Vmd MCP server in PolicyLayer and add a rule for get_frame_count: 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 Vmd. Nothing to install.
get_frame_count 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_frame_count 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_frame_count. 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_frame_count is provided by the Vmd MCP server (omararias-gaguancela/vmd-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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