# browser_sessionstorage_list

A read tool on the Playwright MCP server.

Agent View of the PolicyLayer registry record for `browser_sessionstorage_list`. HTML page: https://policylayer.com/tools/hanato238-playwright-mcp/browser-sessionstorage-list

## Facts

- Tool: `browser_sessionstorage_list`
- Server: Playwright (`hanato238/playwright-mcp`) — https://policylayer.com/tools/hanato238-playwright-mcp.md
- Homepage: https://github.com/Hanato238/playwright-mcp
- 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_sessionstorage_list",
    "arguments": {}
  }
}
```

## Why browser_sessionstorage_list is rated Low

This tool retrieves session storage data from the browser, a read-only operation with no side effects. The empty description slightly lowers confidence, but the naming pattern and context of sibling tools strongly suggest data retrieval. Session storage access poses minimal risk as it typically contains non-sensitive session data, with blast radius limited to information disclosure.

From the tool's own definition: "Tool name 'browser_sessionstorage_list' indicates a list/query operation on session storage; sibling tools like 'browser_cookie_list' and 'browser_cookie_get' confirm this server's pattern of Read operations for data retrieval."

## Use case

AI agents call browser_sessionstorage_list to retrieve information from Playwright 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 Playwright:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "browser_sessionstorage_list": {}
  }
}
```

## Other tools on Playwright (65)

- `browser_cookie_clear` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-cookie-clear.md
- `browser_cookie_delete` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-cookie-delete.md
- `browser_localstorage_clear` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-localstorage-clear.md
- `browser_localstorage_delete` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-localstorage-delete.md
- `browser_sessionstorage_clear` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-sessionstorage-clear.md
- `browser_sessionstorage_delete` — Destructive — https://policylayer.com/tools/hanato238-playwright-mcp/browser-sessionstorage-delete.md
- `browser_click` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-click.md
- `browser_close` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-close.md
- `browser_drag` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-drag.md
- `browser_drop` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-drop.md
- `browser_evaluate` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-evaluate.md
- `browser_handle_dialog` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-handle-dialog.md
- `browser_hide_highlight` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-hide-highlight.md
- `browser_hover` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-hover.md
- `browser_mouse_click_xy` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-click-xy.md
- `browser_mouse_down` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-down.md
- `browser_mouse_drag_xy` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-drag-xy.md
- `browser_mouse_move_xy` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-move-xy.md
- `browser_mouse_up` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-up.md
- `browser_mouse_wheel` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-mouse-wheel.md
- `browser_navigate` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-navigate.md
- `browser_navigate_back` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-navigate-back.md
- `browser_network_request` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-network-request.md
- `browser_network_state_set` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-network-state-set.md
- `browser_pdf_save` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-pdf-save.md
- `browser_press_key` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-press-key.md
- `browser_resize` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-resize.md
- `browser_resume` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-resume.md
- `browser_route` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-route.md
- `browser_run_code_unsafe` — Execute — https://policylayer.com/tools/hanato238-playwright-mcp/browser-run-code-unsafe.md
- …and 35 more: https://policylayer.com/tools/hanato238-playwright-mcp.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=hanato238-playwright-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/hanato238-playwright-mcp