# set_session_storage

A write tool on the Playwright MCP Server MCP server.

Agent View of the PolicyLayer registry record for `set_session_storage`. HTML page: https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/set-session-storage

## Facts

- Tool: `set_session_storage`
- Server: Playwright MCP Server (`alexrwilliam/playwright-mcp-server`) — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server.md
- Homepage: https://github.com/alexrwilliam/playwright-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "set_session_storage",
    "arguments": {}
  }
}
```

## Why set_session_storage is rated Medium

This tool creates or modifies session storage data in the browser, which is reversible but affects application state. It does not delete data (Destructive), execute arbitrary code (Execute), or move money (Financial).

From the tool's own definition: "Tool name 'set_session_storage' indicates modification of browser session storage. Playwright is a browser automation framework; setting session storage modifies client-side data that can affect application state and behavior."

## Use case

AI agents use set_session_storage to create or update resources in Playwright MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Playwright MCP Server environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Playwright MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_session_storage": {
      "limits": [
        {
          "counter": "set_session_storage_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Playwright MCP Server (66)

- `clear_cookies` — Destructive — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/clear-cookies.md
- `clear_network_logs` — Destructive — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/clear-network-logs.md
- `clear_storage` — Destructive — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/clear-storage.md
- `apply_antidetect_preset` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/apply-antidetect-preset.md
- `check_checkbox` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/check-checkbox.md
- `clear_text` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/clear-text.md
- `click` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/click.md
- `evaluate` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/evaluate.md
- `fill` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/fill.md
- `go_back` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/go-back.md
- `go_forward` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/go-forward.md
- `hover` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/hover.md
- `intercept_route` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/intercept-route.md
- `navigate` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/navigate.md
- `press_key` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/press-key.md
- `recreate_context` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/recreate-context.md
- `reload` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/reload.md
- `restart_browser` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/restart-browser.md
- `scroll` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/scroll.md
- `select_option` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/select-option.md
- `set_extra_headers` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/set-extra-headers.md
- `set_user_agent` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/set-user-agent.md
- `set_viewport_size` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/set-viewport-size.md
- `switch_page` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/switch-page.md
- `switch_to_latest_page` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/switch-to-latest-page.md
- `type_text` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/type-text.md
- `uncheck_checkbox` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/uncheck-checkbox.md
- `unroute_all` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/unroute-all.md
- `upload_file` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/upload-file.md
- `wait_for_element` — Execute — https://policylayer.com/tools/alexrwilliam-playwright-mcp-server/wait-for-element.md
- …and 36 more: https://policylayer.com/tools/alexrwilliam-playwright-mcp-server.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=alexrwilliam-playwright-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/alexrwilliam-playwright-mcp-server