Sets the blend mode of a scene item. Args: scene_name: Name of the scene the item is in scene_item_id: ID of the scene item blend_mode: New blend mode (OBS_BLEND_NORMAL, etc.)
AI agents use set_scene_item_blend_mode to create or update resources in OBS MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your OBS MCP Server environment.
This tool changes visual presentation settings (blend mode) of a scene item in OBS Studio. It is a Write operation because it modifies state reversibly—the blend mode can be changed back to its previous value.
From the tool's definition Tool modifies scene item properties ('Sets the blend mode of a scene item'), specifically the blend_mode attribute. This is a reversible modification to OBS Studio scene configuration.
Documented attack patterns abuse exactly the kind of access set_scene_item_blend_mode gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OBS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set_scene_item_blend_mode:
{
"version": "1",
"default": "deny",
"tools": {
"set_scene_item_blend_mode": {
"limits": [
{
"counter": "set_scene_item_blend_mode_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_scene_item_blend_mode 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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Sets the blend mode of a scene item. Args: scene_name: Name of the scene the item is in scene_item_id: ID of the scene item blend_mode: New blend mode (OBS_BLEND_NORMAL, etc.). It is categorised as a Write tool in the OBS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the OBS MCP Server MCP server in PolicyLayer and add a rule for set_scene_item_blend_mode: 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 OBS MCP Server. Nothing to install.
set_scene_item_blend_mode 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_scene_item_blend_mode 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_scene_item_blend_mode. 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_scene_item_blend_mode is provided by the OBS MCP Server MCP server (royshil/obs-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 200 OBS MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
200 OBS MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.