get_actor
AI agents call get_actor to retrieve information from MaStR MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'get_actor' follows the 'get_*' prefix pattern consistent with other Read operations on this MaStR server. The MaStR is a public German energy market register, and actor retrieval is a standard query operation with no side effects. The absence of modifying verbs (create, update, delete, execute) and the context of a data register API strongly indicate this is a Read operation with minimal risk.
From the tool's definition Tool name 'get_actor' suggests data retrieval. Sibling tools on this server (get_api_quota, get_balancing_areas, get_catalog_categories, get_catalog_values, get_grid_connection, get_local_time, get_location, get_recent_changes, get_unit, search_actors_public)…
Attacks that exploit this kind of access
get_actor. It is categorised as a Read tool in the MaStR MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MaStR MCP Server MCP server in PolicyLayer and add a rule for get_actor: 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 MaStR MCP Server. Nothing to install.
get_actor 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_actor 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_actor. 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_actor is provided by the MaStR MCP Server MCP server (UliRCS/mastr-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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