Check if the current session is authenticated with Claude.
AI agents call check_claude_auth to retrieve information from Claude Usage MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only check of authentication state. It retrieves information about the current session without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an attacker could only learn whether a session is authenticated, which has limited security impact compared to other categories.
From the tool's definition Tool name 'check_claude_auth' and description 'Check if the current session is authenticated' indicate a query/verification operation that retrieves authentication status without modifying any data or triggering external operations.
Attacks that exploit this kind of access
Check if the current session is authenticated with Claude. It is categorised as a Read tool in the Claude Usage MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Claude Usage MCP Server MCP server in PolicyLayer and add a rule for check_claude_auth: 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 Claude Usage MCP Server. Nothing to install.
check_claude_auth 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 check_claude_auth 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 check_claude_auth. 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.
check_claude_auth is provided by the Claude Usage MCP Server MCP server (mvacaporale/claude-usage-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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