signavio_update_model

THE RISK

Medium Risk

Why signavio_update_model needs a policy

The tool modifies existing process models by creating new revisions, which is a reversible write operation. It does not delete data (would be Destructive), execute arbitrary code (would be Execute), move money (would be Financial), or merely retrieve data (would be Read). The severity is medium because modifying business process models could impact organizational workflows, but the change is versioned and reversible.

From the tool's definition Tool name 'signavio_update_model' with description 'Update a model by creating a new revision' indicates creating/modifying process models in SAP Signavio by establishing new versions.

Documented attack patterns abuse exactly the kind of access signavio_update_model gives an agent:

POLICY

How to control signavio_update_model

PolicyLayer is an MCP gateway — it sits between your AI agents and Signavio MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for signavio_update_model:

policy.json

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

signavio_update_model 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.

Create a free account and register Signavio MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Signavio MCP Server tools

Destructive signavio_delete_dictionary_entry Delete a dictionary entry Destructive signavio_delete_folder Permanently delete a folder and all its contents Write signavio_create_dictionary_category Create a new dictionary category Write signavio_create_dictionary_entry Create a new dictionary entry Write signavio_create_folder Create a new folder Write signavio_create_model Create a new model/diagram Write signavio_move_folder Move a folder to a new parent or to trash Write signavio_move_model Move a model to a different folder

All 23 Signavio MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about signavio_update_model

What does the signavio_update_model tool do? +

Update a model by creating a new revision. It is categorised as a Write tool in the Signavio 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 signavio_update_model? +

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

What risk level is signavio_update_model? +

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

Can I rate-limit signavio_update_model? +

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

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

signavio_update_model is provided by the Signavio MCP Server MCP server (willpowell8/signavio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Signavio MCP Server tool call.

Start from Signavio MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →