This record as markdown: /tools/jjpxdev-unreal-mcp/add-track.md
What add_track does on Unreal
AI agents use add_track to create or update resources in Unreal, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unreal environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
binding_id | string | Yes | Binding ID (from add_actor_binding or get_sequence_info) |
track_type | string | Yes | Track class name |
sequence_path | string | Yes | LevelSequence asset path |
Parameters from the server's own tool schema.
Why add_track is rated Medium
This tool creates new data (a track) within an existing sequence, which is a reversible modification. It does not execute arbitrary operations, delete data, or move money. The blast radius is medium because misconfiguring tracks could corrupt a sequence project state, but changes are typically undoable in Unreal Engine's undo system.
From the tool's definition Tool name is 'add_track' and description states it will 'Add a track to an actor binding in a sequence' — this creates a new track object within a sequencer binding, modifying the sequence structure.
Attacks that exploit this kind of access
The rule that runs add_track safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Unreal, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_track, this is the rule to start with:
add_track 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Unreal, apply this rule, and every add_track call is checked against it from then on.
Questions about add_track
Add a track to an actor binding in a sequence. It is categorised as a Write tool in the Unreal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
add_track accepts 3 parameters: binding_id, track_type, sequence_path. Required: binding_id, track_type, sequence_path. The full parameter table on this page comes from the server's own tool schema.
Register the Unreal MCP server in PolicyLayer and add a rule for add_track: 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 Unreal. Nothing to install.
add_track 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 add_track 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 add_track. 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.
add_track is provided by the Unreal MCP server (@jjpxdev/unreal-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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