Export full network activity log in HAR format (see browser_docs)
AI agents call browser_net_export_har to retrieve information from Browser MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and exports recorded network activity (HTTP requests/responses, headers, timings) in HAR format. It retrieves existing data without modifying state. However, severity is medium because HAR files can contain sensitive data including cookies, auth tokens, and request/response bodies that could be exposed if misused.
From the tool's definition Export full network activity log in HAR format
Attacks that exploit this kind of access
Export full network activity log in HAR format (see browser_docs). It is categorised as a Read tool in the Browser MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Browser MCP Server MCP server in PolicyLayer and add a rule for browser_net_export_har: 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 Browser MCP Server. Nothing to install.
browser_net_export_har 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 browser_net_export_har 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 browser_net_export_har. 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.
browser_net_export_har is provided by the Browser MCP Server MCP server (madebytokens/browser-mcp-server). 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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