Add an If-Then-Else action that checks if a variable contains a value.
AI agents use km_add_if_variable_contains to create or update resources in Keyboard Maestro — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Keyboard Maestro environment.
This tool adds a conditional (If-Then-Else) action to a Keyboard Maestro macro. It creates/modifies macro structure by inserting a new action, which is a reversible write operation. It doesn't execute code, delete data, or involve financial transactions. Severity is medium because modifying macro logic can affect automation behavior, but the action itself is a structural write to a macro definition.
From the tool's definition Add an If-Then-Else action that checks if a variable contains a value
Documented attack patterns abuse exactly the kind of access km_add_if_variable_contains gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Keyboard Maestro, and nothing reaches the server without passing your rules. This is the rule we recommend for km_add_if_variable_contains:
{
"version": "1",
"default": "deny",
"tools": {
"km_add_if_variable_contains": {
"limits": [
{
"counter": "km_add_if_variable_contains_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}km_add_if_variable_contains 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.
Free to start. No card required.
Add an If-Then-Else action that checks if a variable contains a value. It is categorised as a Write tool in the Keyboard Maestro MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Keyboard Maestro MCP server in PolicyLayer and add a rule for km_add_if_variable_contains: 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 Keyboard Maestro. Nothing to install.
km_add_if_variable_contains 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 km_add_if_variable_contains 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 km_add_if_variable_contains. 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.
km_add_if_variable_contains is provided by the Keyboard Maestro MCP server (saihgupr/keyboard-maestro-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Keyboard Maestro, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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