update_access_code · Seam MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_access_code does on Seam MCP Server

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

WHY IT NEEDS A POLICY

Why update_access_code needs a policy

Updating access codes is a Write operation—it modifies configuration data without deletion. However, severity is high because misuse could grant unwanted access, disable legitimate codes, or create security gaps in physical access control systems. The blast radius extends to physical security and facility access for multiple lock brands.

From the tool's definition Tool explicitly updates/modifies an existing access code by changing 'name, code, or time limits'. This is a reversible modification that alters stored access control data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_access_code Rate-limited

update_access_code 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": {
    "update_access_code": {
      "limits": [
        {
          "counter": "update_access_code_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Seam MCP Server, so you can run agents against it safely.

FAQ

Questions about update_access_code

What does the update_access_code tool do? +

Update an existing access code (change name, code, or time limits). It is categorised as a Write tool in the Seam MCP 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 update_access_code? +

Register the Seam MCP Server MCP server in PolicyLayer and add a rule for update_access_code: 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 Seam MCP Server. Nothing to install.

What risk level is update_access_code? +

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

Can I rate-limit update_access_code? +

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

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

update_access_code is provided by the Seam MCP Server MCP server (keithah/seam-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.