Create a relation between two tasks. This is how you create subtasks, blocking dependencies, etc. Relation kinds (use the code value): subtask – other task is a subtask of this task parenttask – other task is the parent of this task related – tasks are related (symmetric) blocking – this task blo...
AI agents use create_relation 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.
This tool creates or modifies task relationships in a project management system. It establishes links between existing tasks but does not delete, execute arbitrary code, move financial resources, or irreversibly alter data. Task relations can be modified or removed, making this a Write operation.
From the tool's definition Tool creates a new relation between two tasks with relation kinds including subtask, blocking dependencies, related, precedes, follows, duplicateof, etc. The description explicitly states 'Create a relation' which is a reversible modification operation.
Attacks that exploit this kind of access
Create a relation between two tasks. This is how you create subtasks, blocking dependencies, etc. Relation kinds (use the code value): subtask – other task is a subtask of this task parenttask – other task is the parent of this task related – tasks are related (symmetric) blocking – this task blocks the other task blocked – this task is blocked by the other task precedes – this task comes before the other task follows – this task comes after the other task duplicateof – this task is a duplicate of the other duplicates – other task duplicates this task copiedfrom – this task was copied from the other copiedto – this task was copied to the other Example: to make task #2 a subtask of task #1, call with task_id=1, other_task_id=2, relation_kind=. 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.
Register the Vikunja MCP Server MCP server in PolicyLayer and add a rule for create_relation: 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.
create_relation is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_relation 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.
Set action: deny in the PolicyLayer policy for create_relation. 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.
create_relation 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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