Create a browser session and set it as active. Uses local Playwright by default; set cloud=true for Browserbase cloud.
Part of the Browser Automation server.
Free to start. No card required.
AI agents use stagehand_session_create to create or modify resources in Browser Automation. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call stagehand_session_create repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Browser Automation.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"stagehand_session_create": {
"limits": [
{
"counter": "stagehand_session_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Browser Automation policy for all 13 tools.
These attack patterns abuse exactly the kind of access stagehand_session_create gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a browser session and set it as active. Uses local Playwright by default; set cloud=true for Browserbase cloud.. It is categorised as a Write tool in the Browser Automation MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Browser Automation MCP server in PolicyLayer and add a rule for stagehand_session_create: 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 Automation. Nothing to install.
stagehand_session_create 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 stagehand_session_create 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 stagehand_session_create. 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.
stagehand_session_create is provided by the Browser Automation MCP server (@popoverai/browser-automation). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Browser Automation tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.