AI agents call list_actors to retrieve information from Jikan without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves account information (listing actors/users) without creating, modifying, deleting, or executing anything. It is purely informational in nature with minimal security impact—knowing who has access to an account is low-risk compared to unauthorized modifications or deletions. The blast radius of misuse is minimal (information disclosure only).
From the tool's definition Tool name 'list_actors' and description 'List all actors (humans + agents) in your account' indicates a query/retrieval operation with no modification capability.
Attacks that exploit this kind of access
List all actors (humans + agents) in your account. Free (0 credits). It is categorised as a Read tool in the Jikan MCP Server, which means it retrieves data without modifying state.
Register the Jikan MCP server in PolicyLayer and add a rule for list_actors: 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 Jikan. Nothing to install.
list_actors 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_actors 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_actors. 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_actors is provided by the Jikan MCP server (thunderrabbit/jikan). 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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