Add a transition between states in an Animator Controller. Supports conditions, exit time, and AnyState transitions.
AI agents use unity_animation_add_transition to create or update resources in Unity MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Unity MCP Server environment.
This tool creates new transitions in animation controllers—a reversible modification to project data. It does not delete data (ruling out Destructive), execute arbitrary code (ruling out Execute), handle financial transactions (ruling out Financial), or merely read data (ruling out Read).
From the tool's definition Tool description explicitly states it 'Add[s] a transition between states' in an Animator Controller, which creates or modifies animation state machine logic within a Unity project.
Documented attack patterns abuse exactly the kind of access unity_animation_add_transition gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Unity MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unity_animation_add_transition:
{
"version": "1",
"default": "deny",
"tools": {
"unity_animation_add_transition": {
"limits": [
{
"counter": "unity_animation_add_transition_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}unity_animation_add_transition 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.
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Add a transition between states in an Animator Controller. Supports conditions, exit time, and AnyState transitions. It is categorised as a Write tool in the Unity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Unity MCP Server MCP server in PolicyLayer and add a rule for unity_animation_add_transition: 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 Unity MCP Server. Nothing to install.
unity_animation_add_transition 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 unity_animation_add_transition 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 unity_animation_add_transition. 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.
unity_animation_add_transition is provided by the Unity MCP Server MCP server (anklebreaker-studio/unity-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 324 Unity MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
324 Unity MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.