Return B-factors for selected atoms.
AI agents call get_bfactors to retrieve information from ChimeraX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves structural data (B-factors, which represent atomic thermal motion in protein structures) from already-loaded structures. It performs a read-only query on existing data without creating, modifying, deleting, or executing external operations. The verb 'return' and lack of any destructive, write, or execution language confirm this is a pure Read operation with minimal risk.
From the tool's definition Tool name 'get_bfactors' and description 'Return B-factors for selected atoms' indicate a retrieval operation with no modification or side effects. B-factors are crystallographic data properties that can be queried but not altered by this tool.
Attacks that exploit this kind of access
Return B-factors for selected atoms. It is categorised as a Read tool in the ChimeraX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ChimeraX MCP Server MCP server in PolicyLayer and add a rule for get_bfactors: 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 ChimeraX MCP Server. Nothing to install.
get_bfactors 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_bfactors 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_bfactors. 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_bfactors is provided by the ChimeraX MCP Server MCP server (mahynotch/chimerax-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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