AI agents call list_cached_scenes to retrieve information from Spline without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query/enumeration function to display cached scene files. It has no capability to modify, delete, execute, or trigger external operations. The blast radius of misuse is minimal — an agent could only discover what scenes are cached locally. No data destruction, code execution, or financial impact is possible.
From the tool's definition Tool name is 'list_cached_scenes' and description states 'List all cached .splinecode files' — a read-only operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
List all cached .splinecode files. It is categorised as a Read tool in the Spline MCP Server, which means it retrieves data without modifying state.
Register the Spline MCP server in PolicyLayer and add a rule for list_cached_scenes: 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 Spline. Nothing to install.
list_cached_scenes 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 list_cached_scenes 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 list_cached_scenes. 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.
list_cached_scenes is provided by the Spline MCP server (lesleslie/spline-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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