Export a recorded session (or filtered subset) to HAR format.
AI agents call proxy_export_har to retrieve information from Proxy 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 previously captured network traffic data into HAR format. It does not modify, delete, or execute anything — it retrieves recorded session data. However, severity is medium because HAR files can contain sensitive information like cookies, authorization headers, and request/response bodies captured by the MITM proxy.
From the tool's definition Export a recorded session (or filtered subset) to HAR format
Documented attack patterns abuse exactly the kind of access proxy_export_har gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for proxy_export_har:
{
"version": "1",
"default": "deny",
"tools": {
"proxy_export_har": {}
}
}proxy_export_har is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Export a recorded session (or filtered subset) to HAR format. It is categorised as a Read tool in the Proxy MCP Server, which means it retrieves data without modifying state.
Register the Proxy MCP server in PolicyLayer and add a rule for proxy_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 Proxy. Nothing to install.
proxy_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 proxy_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 proxy_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.
proxy_export_har is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
89 Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.