Retrieve a specific environment variable from your Rails application running on Hatchbox via SSH. This tool connects to your server and reads the requested environment variable directly from the running puma process. Example response: RAILS_ENV=production Or if not found: Environment variable
AI agents call getEnvVar to retrieve information from Playwright Stealth without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries environment variable values from a running Rails application. It performs a read-only operation that returns data without modifying, deleting, or executing any code. While environment variables may contain sensitive information (credentials, API keys), the tool itself is fundamentally a read operation.
From the tool's definition Tool description states it 'Retrieve[s] a specific environment variable' and 'reads the requested environment variable directly from the running puma process.' The word 'Retrieve' and 'reads' indicate data retrieval with no side effects.
Documented attack patterns abuse exactly the kind of access getEnvVar gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Playwright Stealth, and nothing reaches the server without passing your rules. This is the rule we recommend for getEnvVar:
{
"version": "1",
"default": "deny",
"tools": {
"getEnvVar": {}
}
}getEnvVar is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve a specific environment variable from your Rails application running on Hatchbox via SSH. This tool connects to your server and reads the requested environment variable directly from the running puma process. Example response: RAILS_ENV=production Or if not found: Environment variable. It is categorised as a Read tool in the Playwright Stealth MCP Server, which means it retrieves data without modifying state.
Register the Playwright Stealth MCP server in PolicyLayer and add a rule for getEnvVar: 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 Playwright Stealth. Nothing to install.
getEnvVar 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 getEnvVar 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 getEnvVar. 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.
getEnvVar is provided by the Playwright Stealth MCP server (pulsemcp/mcp-servers). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Playwright Stealth, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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68 Playwright Stealth tools catalogued and risk-classified — across an index of 43,000+ MCP servers.