AI agents call preview_application to retrieve information from Crosswalk without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'preview_application' and description 'Open the application' suggest a read/display operation — opening and viewing an application draft. Preview operations typically have no side effects. However, the description is minimal and uninformative, which lowers confidence.
From the tool's definition 'Open the application' and 'preview' in the tool name suggest viewing/displaying an existing application without modification
Attacks that exploit this kind of access
Open the application. It is categorised as a Read tool in the Crosswalk MCP Server, which means it retrieves data without modifying state.
Register the Crosswalk MCP server in PolicyLayer and add a rule for preview_application: 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 Crosswalk. Nothing to install.
preview_application 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 preview_application 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 preview_application. 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.
preview_application is provided by the Crosswalk MCP server (mohakgarg5/crosswalk-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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