AI agents call list_stdlibs to retrieve information from Jane without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates existing standard library documentation without modifying, deleting, or executing anything. It is a pure query operation that returns information about available documents. The optional filtering parameter does not change the fundamental read-only nature of the operation. Blast radius is minimal—misuse would only expose information already in the knowledge base.
From the tool's definition Tool name 'list_stdlibs' and description 'List available standard library documents, optionally filtered by language' indicate a read-only listing/retrieval operation with no side effects.
Attacks that exploit this kind of access
List available standard library documents, optionally filtered by language. It is categorised as a Read tool in the Jane MCP Server, which means it retrieves data without modifying state.
Register the Jane MCP server in PolicyLayer and add a rule for list_stdlibs: 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 Jane. Nothing to install.
list_stdlibs 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_stdlibs 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_stdlibs. 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_stdlibs is provided by the Jane MCP server (quinncuatro/jane-mcp-server). 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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