create_filter · Vikunja MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_filter does on Vikunja MCP Server

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

WHY IT NEEDS A POLICY

Why create_filter needs a policy

This tool creates and persists a named filter configuration in Vikunja, which is a write operation on the filters collection. It has no destructive effects (filters are not permanent data loss), does not execute arbitrary code or external operations, and does not involve financial transactions. The operation is fully reversible via deletion.

From the tool's definition Tool name 'create_filter' and description 'Save a named filter for reuse' indicates creation of a new filter resource. This is a reversible write operation—filters can be deleted (evidenced by 'delete_filter' sibling tool) and modified.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_filter Rate-limited

create_filter 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": {
    "create_filter": {
      "limits": [
        {
          "counter": "create_filter_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 Vikunja MCP Server, so you can run agents against it safely.

FAQ

Questions about create_filter

What does the create_filter tool do? +

Save a named filter for reuse. Saved filters appear alongside projects in Vikunja. Use the same filter expression syntax as list_tasks. It is categorised as a Write tool in the Vikunja 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 create_filter? +

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

What risk level is create_filter? +

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

Can I rate-limit create_filter? +

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

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

create_filter is provided by the Vikunja MCP Server MCP server (lindenlion/vikunja-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.