Run a Stagehand script file (default export from defineScript) against the current browser session. Returns {status: "passed"|"failed", durationMs}. On failure also returns error and stack. Use after authoring a script to validate it; the MCP's live session is reused, so no sepa...
Accepts file system path (path)
Part of the Browser Automation MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents invoke stagehand_run_script to trigger processes or run actions in Browser Automation. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
stagehand_run_script can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. Intercept enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
tools:
stagehand_run_script:
rules:
- action: allow
rate_limit:
max: 10
window: 60
validate:
required_args: trueSee the full Browser Automation policy for all 13 tools.
Agents calling execute-class tools like stagehand_run_script have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Execute risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
stagehand_run_script is one of the high-risk operations in Browser Automation. For the full severity-focused view — only the high-risk tools with their recommended policies — see the breakdown for this server, or browse all high-risk tools across every MCP server.
Run a Stagehand script file (default export from defineScript) against the current browser session. Returns {status: "passed"|"failed", durationMs}. On failure also returns error and stack. Use after authoring a script to validate it; the MCP's live session is reused, so no separate setup is required.. It is categorised as a Execute tool in the Browser Automation MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Add a rule in your Intercept YAML policy under the tools section for stagehand_run_script. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Browser Automation MCP server.
stagehand_run_script is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the stagehand_run_script rule in your Intercept 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 Intercept policy for stagehand_run_script. 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_run_script is provided by the Browser Automation MCP server (@popoverai/browser-automation). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept