List request/response header fields from proxy-captured traffic since the browser was launched, with pagination and truncation.
AI agents call interceptor_browser_list_network_fields 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 queries captured network traffic metadata (headers) to display to the user. While the severity is elevated because the proxy itself captures sensitive traffic (auth tokens, API keys, PII in headers), the tool's specific function is read-only retrieval of already-intercepted data.
From the tool's definition Tool 'interceptor_browser_list_network_fields' retrieves and lists 'request/response header fields from proxy-captured traffic' with pagination. The verb 'list' and 'from' indicate data retrieval with no modification or deletion.
Documented attack patterns abuse exactly the kind of access interceptor_browser_list_network_fields 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 interceptor_browser_list_network_fields:
{
"version": "1",
"default": "deny",
"tools": {
"interceptor_browser_list_network_fields": {}
}
}interceptor_browser_list_network_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List request/response header fields from proxy-captured traffic since the browser was launched, with pagination and truncation. 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 interceptor_browser_list_network_fields: 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.
interceptor_browser_list_network_fields 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 interceptor_browser_list_network_fields 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 interceptor_browser_list_network_fields. 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.
interceptor_browser_list_network_fields 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.
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89 Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.