visual_baseline_update

Update existing baseline with current screenshot

SERVERClaude Mobile SOURCEalexgladkov/claude-in-mobile

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/alexgladkov-claude-in-mobile/visual-baseline-update.md

WHAT IT DOES

What visual_baseline_update does on Claude Mobile

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

RISK

Why visual_baseline_update is rated Medium

This tool modifies an existing baseline (a reference screenshot used for visual testing/comparison) with new screenshot data. This is a reversible write operation—the baseline can be updated again or reverted. It does not delete data (not Destructive), execute arbitrary code (not Execute), or involve financial transactions (not Financial).

From the tool's definition Tool name 'update' and description 'Update existing baseline with current screenshot' indicate modification of stored data (baseline image/reference).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs visual_baseline_update safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Claude Mobile, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For visual_baseline_update, this is the rule to start with:

visual_baseline_update Rate-limited

visual_baseline_update stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "visual_baseline_update": {
      "limits": [
        {
          "counter": "visual_baseline_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Claude Mobile, apply this rule, and every visual_baseline_update call is checked against it from then on.

FAQ

Questions about visual_baseline_update

What does the visual_baseline_update tool do? +

Update existing baseline with current screenshot. It is categorised as a Write tool in the Claude Mobile MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on visual_baseline_update? +

Register the Claude Mobile MCP server in PolicyLayer and add a rule for visual_baseline_update: 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 Claude Mobile. Nothing to install.

What risk level is visual_baseline_update? +

visual_baseline_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit visual_baseline_update? +

Yes. Add a rate_limit block to the visual_baseline_update 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.

How do I block visual_baseline_update completely? +

Set action: deny in the PolicyLayer policy for visual_baseline_update. 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.

What MCP server provides visual_baseline_update? +

visual_baseline_update is provided by the Claude Mobile MCP server (alexgladkov/claude-in-mobile). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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