Check status of file downloads or list all downloaded files in this session. Downloads happen automatically when you click download links or navigate to files (PDFs, CSVs, etc.) — you do NOT need to call this tool to trigger downloads. Use this tool to: - Wait for a large download to finish: down...
Part of the Chrome server.
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AI agents call download to retrieve information from Chrome without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though download only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"download": {}
}
}See the full Chrome policy for all 23 tools.
These attack patterns abuse exactly the kind of access download gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Check status of file downloads or list all downloaded files in this session. Downloads happen automatically when you click download links or navigate to files (PDFs, CSVs, etc.) — you do NOT need to call this tool to trigger downloads. Use this tool to: - Wait for a large download to finish: download() - List all downloaded files: download({ action: "list" }). It is categorised as a Read tool in the Chrome MCP Server, which means it retrieves data without modifying state.
Register the Chrome MCP server in PolicyLayer and add a rule for download: 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 Chrome. Nothing to install.
download 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 download 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 download. 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.
download is provided by the Chrome MCP server (@silbercue/chrome). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 23 Chrome tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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