set_playback_range
Set the playback start and end frames of a sequence.
This record as markdown: /tools/jjpxdev-unreal-mcp/set-playback-range.md
What set_playback_range does on Unreal
AI agents use set_playback_range 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 |
|---|---|---|---|
end_frame | number | Yes | End frame |
start_frame | number | Yes | Start frame |
sequence_path | string | Yes | LevelSequence asset path |
Parameters from the server's own tool schema.
Why set_playback_range is rated Medium
This tool modifies playback parameters of a sequence in Unreal Engine. While it changes state, the modification is reversible (the playback range can be changed again to different values) and does not create, delete, or irreversibly transform assets. It does not execute arbitrary code or trigger external operations with unpredictable effects—it performs a bounded, well-defined parameter change.
From the tool's definition set_playback_range sets the playback start and end frames of a sequence, which modifies configuration/metadata of a sequence rather than creating new assets or deleting data.
Attacks that exploit this kind of access
The rule that runs set_playback_range 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 set_playback_range, this is the rule to start with:
set_playback_range 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 set_playback_range call is checked against it from then on.
Questions about set_playback_range
Set the playback start and end frames of 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.
set_playback_range accepts 3 parameters: end_frame, start_frame, sequence_path. Required: end_frame, start_frame, 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 set_playback_range: 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.
set_playback_range 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 set_playback_range 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 set_playback_range. 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.
set_playback_range 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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