AI agents call op_version to retrieve information from Op without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves version information with no side effects, no data modification, no code execution, and no access to secrets or sensitive vault data. It is purely informational and has minimal blast radius if misused by an AI agent. The 'No auth required' note further confirms it is a low-risk informational query.
From the tool's definition Tool returns version information of the op CLI binary with 'No auth required'. This is a simple query operation that retrieves metadata about the installed tool.
Attacks that exploit this kind of access
Return the version of the op CLI binary. No auth required. It is categorised as a Read tool in the Op MCP Server, which means it retrieves data without modifying state.
Register the Op MCP server in PolicyLayer and add a rule for op_version: 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 Op. Nothing to install.
op_version 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 op_version 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 op_version. 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.
op_version is provided by the Op MCP server (jluckyiv/op-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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