mcp_update

Update an MCP server

SERVER1MCP Server SOURCE1mcp-app/agent

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/1mcp-app-agent/mcp-update.md

WHAT IT DOES

What mcp_update does on 1MCP Server

AI agents use mcp_update to create or update resources in 1MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your 1MCP Server environment.

RISK

Why mcp_update is rated Medium

The tool modifies MCP server state, which could alter behavior, dependencies, or configurations. While updates are typically reversible (can be downgraded), the high blast radius justifies 'high' severity: a malicious update could inject malicious MCP servers into the aggregator or break connectivity for all clients relying on this unified server.

From the tool's definition Tool name 'mcp_update' and description 'Update an MCP server' indicate modification of existing MCP server configurations or state. This is a reversible write operation on system-critical infrastructure.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mcp_update safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 1MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mcp_update, this is the rule to start with:

mcp_update Rate-limited

mcp_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": {
    "mcp_update": {
      "limits": [
        {
          "counter": "mcp_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 1MCP Server, apply this rule, and every mcp_update call is checked against it from then on.

FAQ

Questions about mcp_update

What does the mcp_update tool do? +

Update an MCP server. It is categorised as a Write tool in the 1MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mcp_update? +

Register the 1MCP Server MCP server in PolicyLayer and add a rule for mcp_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 1MCP Server. Nothing to install.

What risk level is mcp_update? +

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

Can I rate-limit mcp_update? +

Yes. Add a rate_limit block to the mcp_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 mcp_update completely? +

Set action: deny in the PolicyLayer policy for mcp_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 mcp_update? +

mcp_update is provided by the 1MCP Server MCP server (1mcp-app/agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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