This record as markdown: /tools/io-github-0nork-0nmcp/app-validate.md
What app_validate does on 0nmcp
AI agents call app_validate 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 app_validate is rated Low
Validation is a read-only operation that examines an application bundle for correctness, structure, or compliance. It retrieves and analyzes data about the bundle but does not modify, execute, delete, or create side effects. The blast radius is low—a misconfigured validation call cannot harm systems or data beyond potentially false positive/negative validation results.
From the tool's definition Tool name 'app_validate' and description 'Validate a .0n application bundle' indicate inspection/verification of an existing artifact without modification, deletion, or execution.
Attacks that exploit this kind of access
The rule that runs app_validate 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 app_validate, this is the rule to start with:
app_validate 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 app_validate call is checked against it from then on.
Questions about app_validate
Validate a .0n application bundle. 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 app_validate: 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.
app_validate 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 app_validate 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 app_validate. 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.
app_validate 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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