Check if an action would be authorized by Stage0 (does NOT execute the action)
AI agents call check-authorization to retrieve information from Stage0 Authorization 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 authorization status information without performing any side effects, modifications, or actual execution of actions. It is purely informational and defensive in nature—designed to prevent unauthorized actions by checking permissions before they occur. This is a classic Read category operation: it queries state (authorization policy) and returns information without changing anything.
From the tool's definition Tool description explicitly states it 'Check if an action would be authorized' and '(does NOT execute the action)'. The name 'check-authorization' and the non-execution nature clearly indicate a read-only query operation.
Attacks that exploit this kind of access
Check if an action would be authorized by Stage0 (does NOT execute the action). It is categorised as a Read tool in the Stage0 Authorization MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Stage0 Authorization MCP Server MCP server in PolicyLayer and add a rule for check-authorization: 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 Stage0 Authorization MCP Server. Nothing to install.
check-authorization 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-authorization 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-authorization. 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-authorization is provided by the Stage0 Authorization MCP Server MCP server (starlight143/mcp-server-stage0-authorization). 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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