Creates a new filter on a source. Args: source_name: Name of the source to add the filter to filter_name: Name for the new filter filter_kind: Type of filter to add filter_settings: Settings object to initialize the filter with
AI agents use create_source_filter 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 creates a new filter resource on an OBS source, which is a reversible write operation. It modifies the OBS configuration by adding a filter, but this change can be undone by deleting the filter. It does not execute arbitrary code, delete data, move money, or perform irreversible operations.
From the tool's definition Tool description states 'Creates a new filter on a source' with parameters for source_name, filter_name, filter_kind, and filter_settings. The verb 'Creates' and action of initializing a new filter indicates data modification.
Documented attack patterns abuse exactly the kind of access create_source_filter 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 create_source_filter:
{
"version": "1",
"default": "deny",
"tools": {
"create_source_filter": {
"limits": [
{
"counter": "create_source_filter_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_source_filter 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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Creates a new filter on a source. Args: source_name: Name of the source to add the filter to filter_name: Name for the new filter filter_kind: Type of filter to add filter_settings: Settings object to initialize the filter with. 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 create_source_filter: 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.
create_source_filter 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 create_source_filter 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 create_source_filter. 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.
create_source_filter 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.