Check agent authorization status: operator address, on-chain allowances, and chain config
AI agents call yault_check_authorization to retrieve information from Yault AESP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves authorization metadata (operator address, allowances, chain configuration) without creating, modifying, deleting, or executing any operations. It is a passive query of blockchain state. While it operates in a financial context (crypto vault), the tool itself performs no financial transaction, only reads current authorization status.
From the tool's definition The tool name is 'yault_check_authorization' and the description states it 'Check[s] agent authorization status: operator address, on-chain allowances, and chain config' — these are read-only operations that query and retrieve authorization information…
Attacks that exploit this kind of access
Check agent authorization status: operator address, on-chain allowances, and chain config. It is categorised as a Read tool in the Yault AESP MCP Server, which means it retrieves data without modifying state.
Register the Yault AESP MCP server in PolicyLayer and add a rule for yault_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 Yault AESP. Nothing to install.
yault_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 yault_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 yault_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.
yault_check_authorization is provided by the Yault AESP MCP server (@yault/aesp). 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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