# browser_perf Get page performance metrics. Agent View of the PolicyLayer registry record for `browser_perf`. HTML page: https://policylayer.com/tools/salviz-termux-browser-pilot/browser-perf ## Facts - Tool: `browser_perf` - Server: Termux Browser Pilot (`salviz/termux-browser-pilot`) — https://policylayer.com/tools/salviz-termux-browser-pilot.md - Homepage: https://github.com/salviz/termux-browser-pilot - Risk category: Read (Low risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Allowed ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "browser_perf", "arguments": {} } } ``` ## Why browser_perf is rated Low This tool retrieves performance metrics from the current page (e.g., load times, resource timings, FCP, LCP). It is a read-only operation with no side effects, no code execution, and no data modification. The blast radius of misuse is minimal—an agent could gather performance data but cannot interact with page content, modify state, or trigger actions. From the tool's own definition: "Tool name 'browser_perf' and description 'Get page performance metrics' indicate a retrieval operation that queries performance data without modifying browser state or triggering external actions." ## Use case AI agents call browser_perf to retrieve information from Termux Browser Pilot without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere. ## Recommended policy (PolicyLayer) Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Termux Browser Pilot: ```json { "version": "1", "default": "deny", "tools": { "browser_perf": {} } } ``` ## Other tools on Termux Browser Pilot (147) - `browser_auth_delete` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-auth-delete.md - `browser_console_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-console-clear.md - `browser_cookies_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-cookies-clear.md - `browser_dialog_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-dialog-clear.md - `browser_events_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-events-clear.md - `browser_headers_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-headers-clear.md - `browser_mock_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-mock-clear.md - `browser_mutations_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-mutations-clear.md - `browser_network_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-network-clear.md - `browser_profile_delete` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-profile-delete.md - `browser_responses_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-responses-clear.md - `browser_session_delete` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-session-delete.md - `browser_snapshot_delete` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-snapshot-delete.md - `browser_storage_clear` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-storage-clear.md - `browser_storage_remove` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-storage-remove.md - `browser_tab_close` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-tab-close.md - `browser_unblock` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-unblock.md - `browser_window_close` — Destructive — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-window-close.md - `browser_attr_remove` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-attr-remove.md - `browser_attr_set` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-attr-set.md - `browser_auth_load` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-auth-load.md - `browser_back` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-back.md - `browser_block` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-block.md - `browser_check` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-check.md - `browser_click` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-click.md - `browser_console_start` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-console-start.md - `browser_console_stop` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-console-stop.md - `browser_cookies_load` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-cookies-load.md - `browser_css_inject` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-css-inject.md - `browser_css_remove` — Execute — https://policylayer.com/tools/salviz-termux-browser-pilot/browser-css-remove.md - …and 117 more: https://policylayer.com/tools/salviz-termux-browser-pilot.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=salviz-termux-browser-pilot · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/salviz-termux-browser-pilot