# browser_set_localstorage

A write tool on the Looking Glass MCP server.

Agent View of the PolicyLayer registry record for `browser_set_localstorage`. HTML page: https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-set-localstorage

## Facts

- Tool: `browser_set_localstorage`
- Server: Looking Glass (`looking-glass-mcp`) — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp.md
- Install: `npx -y looking-glass-mcp`
- Homepage: https://github.com/Sahib-Sawhney-WH/LookingGlass
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 2 (2 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `key` | string | yes | Storage key |
| `value` | string | yes | Storage value |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "browser_set_localstorage",
    "arguments": {
      "key": "<key>",
      "value": "<value>"
    }
  }
}
```

## Why browser_set_localstorage is rated Medium

Setting localStorage values modifies client-side persistent data reversibly. This is a Write operation—data can be changed or cleared. Severity is medium because localStorage modifications could affect application behavior, session state, or persistence of sensitive data, but the blast radius is limited to the current browser context and the operation is reversible (unlike Destructive actions).

From the tool's own definition: "Tool name 'browser_set_localstorage' indicates modification of browser local storage; sibling tools like 'browser_clear_storage' and 'browser_clear_mocks' confirm this server manipulates browser state. The 'set' verb denotes data creation/modification."

## Use case

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

## Recommended policy (PolicyLayer)

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

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

## Other tools on Looking Glass (70)

- `browser_clean_slate` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-clean-slate.md
- `browser_clear_history` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-clear-history.md
- `browser_clear_mocks` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-clear-mocks.md
- `browser_clear_storage` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-clear-storage.md
- `browser_close` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-close.md
- `session_end` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/session-end.md
- `test_chaos_clear` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/test-chaos-clear.md
- `vault_delete` — Destructive — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/vault-delete.md
- `browser_click` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-click.md
- `browser_drag` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-drag.md
- `browser_evaluate` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-evaluate.md
- `browser_explore` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-explore.md
- `browser_fill_and_submit` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-fill-and-submit.md
- `browser_go` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-go.md
- `browser_go_back` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-go-back.md
- `browser_go_forward` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-go-forward.md
- `browser_hover` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-hover.md
- `browser_login` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-login.md
- `browser_mock_route` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-mock-route.md
- `browser_navigate` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-navigate.md
- `browser_performance_audit` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-performance-audit.md
- `browser_press_key` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-press-key.md
- `browser_recover` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-recover.md
- `browser_resolve_element` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-resolve-element.md
- `browser_scroll` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-scroll.md
- `browser_select_option` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-select-option.md
- `browser_smart_click` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-smart-click.md
- `browser_tab_new` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-tab-new.md
- `browser_tab_select` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-tab-select.md
- `browser_type` — Execute — https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-mcp/browser-type.md
- …and 40 more: https://policylayer.com/tools/io-github-sahib-sawhney-wh-looking-glass-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=io-github-sahib-sawhney-wh-looking-glass-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-sahib-sawhney-wh-looking-glass-mcp