Adding a vacancy in the blacklist
AI agents use add-vacancy-to-blacklisted to create or update resources in HeadHunter API MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your HeadHunter API MCP Server environment.
This operation creates or modifies blacklist metadata associated with a vacancy—a reversible write action. It doesn't delete data permanently (Destructive) nor execute arbitrary code (Execute). The severity is medium because misuse could result in incorrect job listings being blacklisted, affecting recruiter workflows and visibility, but the action is reversible and has limited financial or system-wide impact.
From the tool's definition Tool name 'add-vacancy-to-blacklisted' and description 'Adding a vacancy in the blacklist' indicate a data modification operation that adds/updates blacklist state for a vacancy resource.
Attacks that exploit this kind of access
Adding a vacancy in the blacklist. It is categorised as a Write tool in the HeadHunter API MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the HeadHunter API MCP Server MCP server in PolicyLayer and add a rule for add-vacancy-to-blacklisted: 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 HeadHunter API MCP Server. Nothing to install.
add-vacancy-to-blacklisted is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add-vacancy-to-blacklisted 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 add-vacancy-to-blacklisted. 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.
add-vacancy-to-blacklisted is provided by the HeadHunter API MCP Server MCP server (sargonpiraev/hh-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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