Sets a repository, organization, or environment GitHub Actions variable. Variables are not secret and may be visible in logs.
AI agents use variable-set to create or update resources in Make — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Make environment.
This tool modifies GitHub Actions variables, which are configuration artifacts that control CI/CD behavior. While the changes are reversible (variables can be updated or deleted), they can affect downstream workflows, deployments, and system behavior.
From the tool's definition Tool description states it 'Sets a repository, organization, or environment GitHub Actions variable', which modifies configuration state.
Documented attack patterns abuse exactly the kind of access variable-set gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Make, and nothing reaches the server without passing your rules. This is the rule we recommend for variable-set:
{
"version": "1",
"default": "deny",
"tools": {
"variable-set": {
"limits": [
{
"counter": "variable-set_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}variable-set 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.
Sets a repository, organization, or environment GitHub Actions variable. Variables are not secret and may be visible in logs. It is categorised as a Write tool in the Make MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Make MCP server in PolicyLayer and add a rule for variable-set: 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 Make. Nothing to install.
variable-set 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 variable-set 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 variable-set. 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.
variable-set is provided by the Make MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Make, 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.
202 Make tools catalogued and risk-classified — across an index of 43,000+ MCP servers.