apply_anim_modifier
Apply an animation modifier to an animation sequence.
This record as markdown: /tools/jjpxdev-unreal-mcp/apply-anim-modifier.md
What apply_anim_modifier does on Unreal
AI agents use apply_anim_modifier 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 |
|---|---|---|---|
sequence_path | string | Yes | AnimSequence asset path |
modifier_class | string | Yes | Animation modifier class name |
Parameters from the server's own tool schema.
Why apply_anim_modifier is rated Medium
This tool modifies animation assets within Unreal Engine by applying modifiers to sequences. This is a reversible Write operation—the modification can be undone or changed. It's not Destructive because animation modifiers are non-destructive adjustments, not irreversible deletions. It's not Execute in the sense of arbitrary code execution, but rather a targeted asset manipulation.
From the tool's definition Tool applies (modifies) an animation modifier to an animation sequence. The verb 'apply' indicates a modification operation that changes animation asset state.
Attacks that exploit this kind of access
The rule that runs apply_anim_modifier 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 apply_anim_modifier, this is the rule to start with:
apply_anim_modifier 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 apply_anim_modifier call is checked against it from then on.
Questions about apply_anim_modifier
Apply an animation modifier to an animation 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.
apply_anim_modifier accepts 2 parameters: sequence_path, modifier_class. Required: sequence_path, modifier_class. 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 apply_anim_modifier: 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.
apply_anim_modifier 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 apply_anim_modifier 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 apply_anim_modifier. 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.
apply_anim_modifier 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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