browser_navigate_back

THE RISK

High Risk

Why browser_navigate_back needs a policy

This tool triggers a browser navigation action (going back), which is an external operation whose effects depend on the current browser state and navigation history. Browser control actions are classified as Execute because they trigger operations with side effects that are not simply read operations.

From the tool's definition Tool name 'browser_navigate_back' indicates a browser control action. The description is empty, providing no additional context.

Documented attack patterns abuse exactly the kind of access browser_navigate_back gives an agent:

POLICY

How to control browser_navigate_back

PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Valkey, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_navigate_back:

policy.json

{
  "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.

Create a free account and register Awslabs Valkey — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern code and CI agents → Branch allowlists, approval on merges, and rate caps on the build and pipeline tools agents trigger.
High-risk tools in Awslabs Valkey → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about browser_navigate_back

What does the browser_navigate_back tool do? +

browser_navigate_back. It is categorised as a Execute tool in the Awslabs Valkey MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on browser_navigate_back? +

Register the Awslabs Valkey 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 Awslabs Valkey. Nothing to install.

What risk level is browser_navigate_back? +

browser_navigate_back is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit browser_navigate_back? +

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.

How do I block browser_navigate_back completely? +

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.

What MCP server provides browser_navigate_back? +

browser_navigate_back is provided by the Awslabs Valkey MCP server (awslabs.valkey-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Awslabs Valkey tool call.

Start from Awslabs Valkey, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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