AI agents call openart_list_characters to retrieve information from Openart without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns existing data (a list of characters) without creating, modifying, deleting, or executing any actions. It is a straightforward read operation with minimal security risk.
From the tool's definition Tool name is 'openart_list_characters' and description states it 'List all characters/avatars in the user' — a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List all characters/avatars in the user. It is categorised as a Read tool in the Openart MCP Server, which means it retrieves data without modifying state.
Register the Openart MCP server in PolicyLayer and add a rule for openart_list_characters: 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 Openart. Nothing to install.
openart_list_characters 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 openart_list_characters 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 openart_list_characters. 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.
openart_list_characters is provided by the Openart MCP server (jbertus/openart-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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