Extract Discord username from a candidate
AI agents call extract_discord_username to retrieve information from Viterbit MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/extracts existing candidate information (a Discord username) without creating, modifying, deleting, or executing any operations. It is a read-only query that has no side effects on the recruitment system or candidate data.
From the tool's definition Tool name is 'extract_discord_username' and description states it 'Extract[s] Discord username from a candidate' — a pure data retrieval operation with no modification, deletion, or execution capability.
Attacks that exploit this kind of access
Extract Discord username from a candidate. It is categorised as a Read tool in the Viterbit MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Viterbit MCP Server MCP server in PolicyLayer and add a rule for extract_discord_username: 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 Viterbit MCP Server. Nothing to install.
extract_discord_username 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 extract_discord_username 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 extract_discord_username. 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.
extract_discord_username is provided by the Viterbit MCP Server MCP server (techkampe/mcp_viterbit). 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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