update_client · FacturaHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_client does on FacturaHub MCP Server

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

WHY IT NEEDS A POLICY

Why update_client needs a policy

The tool modifies existing client data (email, address, tax ID, etc.) but does not delete or destroy information—changes are reversible through subsequent updates. This fits the Write category (create or modify data reversibly). Severity is medium because incorrect client data could cause billing/communication issues, but the impact is limited to a single client record and reversible.

From the tool's definition Tool description explicitly states 'Update client details' with fields like name, email, company, taxId, country, address, phone. This is a data modification operation that creates or modifies client records reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_client Rate-limited

update_client 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_client": {
      "limits": [
        {
          "counter": "update_client_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 FacturaHub MCP Server, so you can run agents against it safely.

FAQ

Questions about update_client

What does the update_client tool do? +

[FacturaHub] Update client details (name, email, company, taxId, country, address, phone). It is categorised as a Write tool in the FacturaHub 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_client? +

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

What risk level is update_client? +

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

Can I rate-limit update_client? +

Yes. Add a rate_limit block to the update_client 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_client completely? +

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

update_client is provided by the FacturaHub MCP Server MCP server (santy1422/facturahub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.