save_app

SERVEROpen Mcp Apps SOURCE@2nd1st/open-mcp-apps

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/2nd1st-open-mcp-apps/save-app.md

WHAT IT DOES

What save_app does on Open Mcp Apps

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

RISK

Why save_app is rated Medium

Modifies persistent app registry by creating or updating UI app definitions and manifests.

From the tool's definition Create or update a UI app in the persistent registry

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs save_app safely

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

save_app Rate-limited

save_app 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": {
    "save_app": {
      "limits": [
        {
          "counter": "save_app_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 Open Mcp Apps, apply this rule, and every save_app call is checked against it from then on.

FAQ

Questions about save_app

What does the save_app tool do? +

Create or update a UI app in the persistent registry. Two slots, each optional on update (an omitted slot keeps its current value): ui — the complete self-contained HTML document (contract in get_app_guide; window.oma, no external resources, NO embedded manifest block) — and manifest, the app. It is categorised as a Write tool in the Open Mcp Apps MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on save_app? +

Register the Open Mcp Apps MCP server in PolicyLayer and add a rule for save_app: 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 Open Mcp Apps. Nothing to install.

What risk level is save_app? +

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

Can I rate-limit save_app? +

Yes. Add a rate_limit block to the save_app 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 save_app completely? +

Set action: deny in the PolicyLayer policy for save_app. 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 save_app? +

save_app is provided by the Open Mcp Apps MCP server (@2nd1st/open-mcp-apps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Open Mcp Apps, and thousands of servers like it.

This server

All 32 Open Mcp Apps tools →

Across the catalogue

save_snapshot on Why Did You Render → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →