browser_snapshot_navigate_to_line
Navigate to a specific global line number in the current page snapshot with configurable surrounding context lines. Shows which spans contain the context lines. The target line is marked with
This record as markdown: /tools/cowork-bench/browser-snapshot-navigate-to-line.md
What browser_snapshot_navigate_to_line does on Cowork Bench
AI agents call browser_snapshot_navigate_to_line to retrieve information from Cowork Bench without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why browser_snapshot_navigate_to_line is rated Low
Even though browser_snapshot_navigate_to_line only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Attacks that exploit this kind of access
The rule that runs browser_snapshot_navigate_to_line safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Cowork Bench, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For browser_snapshot_navigate_to_line, this is the rule to start with:
browser_snapshot_navigate_to_line is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Cowork Bench, apply this rule, and every browser_snapshot_navigate_to_line call is checked against it from then on.
Questions about browser_snapshot_navigate_to_line
Navigate to a specific global line number in the current page snapshot with configurable surrounding context lines. Shows which spans contain the context lines. The target line is marked with. It is categorised as a Read tool in the Cowork Bench MCP Server, which means it retrieves data without modifying state.
Register the Cowork Bench MCP server in PolicyLayer and add a rule for browser_snapshot_navigate_to_line: 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 Cowork Bench. Nothing to install.
browser_snapshot_navigate_to_line 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 browser_snapshot_navigate_to_line 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_snapshot_navigate_to_line. 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_snapshot_navigate_to_line is provided by the Cowork Bench MCP server (0717376/cowork_bench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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