save_cookies_from_browser

WHAT IT DOES

What save_cookies_from_browser does on YST KPI Daily Report Collector

AI agents use save_cookies_from_browser to create or update resources in YST KPI Daily Report Collector — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your YST KPI Daily Report Collector environment.

WHY IT NEEDS A POLICY

Why save_cookies_from_browser needs a policy

This tool writes/persists authentication cookies to storage, enabling future session reuse without re-authentication. While not destructive or financial, storing credentials creates a security risk if accessed by an unauthorized agent—they could reuse saved sessions. The Write category applies because the tool creates and stores data (cookies) with reversible side effects.

From the tool's definition Tool name 'save_cookies_from_browser' and description '保存浏览器 Cookie（用于首次登录）' (Save browser cookies for initial login) explicitly indicate persistent storage of authentication credentials.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

save_cookies_from_browser Rate-limited

save_cookies_from_browser stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_cookies_from_browser": {
      "limits": [
        {
          "counter": "save_cookies_from_browser_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches YST KPI Daily Report Collector, so you can run agents against it safely.

FAQ

Questions about save_cookies_from_browser

What does the save_cookies_from_browser tool do? +

保存浏览器 Cookie（用于首次登录）. It is categorised as a Write tool in the YST KPI Daily Report Collector MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on save_cookies_from_browser? +

Register the YST KPI Daily Report Collector MCP server in PolicyLayer and add a rule for save_cookies_from_browser: 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 YST KPI Daily Report Collector. Nothing to install.

What risk level is save_cookies_from_browser? +

save_cookies_from_browser is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit save_cookies_from_browser? +

Yes. Add a rate_limit block to the save_cookies_from_browser 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.

How do I block save_cookies_from_browser completely? +

Set action: deny in the PolicyLayer policy for save_cookies_from_browser. 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.

What MCP server provides save_cookies_from_browser? +

save_cookies_from_browser is provided by the YST KPI Daily Report Collector MCP server (xuzan9396/yst_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.