AI agents invoke browser_navigate_back to trigger actions in AWS Labs postgres MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Browser navigation is an Execute-category action because it triggers external side effects (changing browser state, loading pages, executing client-side scripts) whose impact depends on the current page context. While the immediate effect (back button) is reversible, it qualifies as Execute rather than Write because it controls an external system (browser) rather than directly modifying application data.
From the tool's definition Tool name 'browser_navigate_back' indicates it performs a browser automation action. The empty description prevents definitive classification but the action—navigating browser state—constitutes execution of external operations via browser control.
Documented attack patterns abuse exactly the kind of access browser_navigate_back gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS Labs postgres MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_navigate_back:
{
"version": "1",
"default": "deny",
"tools": {
"browser_navigate_back": {
"limits": [
{
"counter": "browser_navigate_back_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}browser_navigate_back stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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browser_navigate_back. It is categorised as a Execute tool in the AWS Labs postgres MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the AWS Labs postgres MCP Server MCP server in PolicyLayer and add a rule for browser_navigate_back: 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 AWS Labs postgres MCP Server. Nothing to install.
browser_navigate_back 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 browser_navigate_back 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_navigate_back. 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_navigate_back is provided by the AWS Labs postgres MCP Server MCP server (awslabs.postgres-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS Labs postgres MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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805 AWS Labs postgres MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.