AI agents use browser_cookie_set to create or update resources in Termux Browser Pilot — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Termux Browser Pilot environment.
Setting cookies is a reversible write operation that modifies browser state. It could be misused to inject malicious cookies, impersonate users, or manipulate site behavior, but lacks the irreversibility of destructive operations or the financial impact of transactions. High severity due to potential authentication/session hijacking implications in an automated browser context.
From the tool's definition Tool name 'browser_cookie_set' indicates cookie creation or modification. No description provided, but the context of browser automation and sibling tools like 'browser_auth_save' and 'browser_attr_set' establish this as a data modification operation.
Documented attack patterns abuse exactly the kind of access browser_cookie_set gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Termux Browser Pilot, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_cookie_set:
{
"version": "1",
"default": "deny",
"tools": {
"browser_cookie_set": {
"limits": [
{
"counter": "browser_cookie_set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}browser_cookie_set 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.
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browser_cookie_set. It is categorised as a Write tool in the Termux Browser Pilot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Termux Browser Pilot MCP server in PolicyLayer and add a rule for browser_cookie_set: 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 Termux Browser Pilot. Nothing to install.
browser_cookie_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the browser_cookie_set 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_cookie_set. 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_cookie_set is provided by the Termux Browser Pilot MCP server (salviz/termux-browser-pilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Termux Browser Pilot, 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.
148 Termux Browser Pilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.