Create a NEW scene in Home Assistant. ONLY call when user EXPLICITLY asks to create/save a NEW scene. Before calling: 1) Show current lights with scene_show_lights, 2) Ask user for mode: 'exclusive' or 'additive'. Do NOT call this to update existing scenes - use scene_update for that.
Part of the Ha server.
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AI agents use scene_create to create or modify resources in Ha. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call scene_create repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Ha.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"scene_create": {
"limits": [
{
"counter": "scene_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Ha policy for all 11 tools.
These attack patterns abuse exactly the kind of access scene_create gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a NEW scene in Home Assistant. ONLY call when user EXPLICITLY asks to create/save a NEW scene. Before calling: 1) Show current lights with scene_show_lights, 2) Ask user for mode: 'exclusive' or 'additive'. Do NOT call this to update existing scenes - use scene_update for that.. It is categorised as a Write tool in the Ha MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ha MCP server in PolicyLayer and add a rule for scene_create: 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 Ha. Nothing to install.
scene_create 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 scene_create 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 scene_create. 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.
scene_create is provided by the Ha MCP server (ha-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 11 Ha tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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