This record as markdown: /tools/io-github-0nork-0nmcp/vault-fingerprint.md
What vault_fingerprint does on 0nmcp
AI agents call vault_fingerprint to retrieve information from 0nmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why vault_fingerprint is rated Low
This tool appears to query system metadata to display machine identity information without modifying, executing commands, or causing destructive effects. The verb 'show' is passive and the description suggests simple retrieval of existing system properties. While fingerprinting can have privacy implications, the tool itself performs no writes or destructive actions.
From the tool's definition Tool name 'vault_fingerprint' with description 'Show your machine' indicates a read-only operation that retrieves machine identification information (fingerprint/hardware identifier).
Attacks that exploit this kind of access
The rule that runs vault_fingerprint safely
PolicyLayer is an MCP gateway: it sits between your AI agents and 0nmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For vault_fingerprint, this is the rule to start with:
vault_fingerprint is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect 0nmcp, apply this rule, and every vault_fingerprint call is checked against it from then on.
Questions about vault_fingerprint
Show your machine. It is categorised as a Read tool in the 0nmcp MCP Server, which means it retrieves data without modifying state.
Register the 0n MCP server in PolicyLayer and add a rule for vault_fingerprint: 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 0nmcp. Nothing to install.
vault_fingerprint 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 vault_fingerprint 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 vault_fingerprint. 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.
vault_fingerprint is provided by the 0n MCP server (0nmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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