Creates a new alias for the deployment with the given deployment ID
AI agents use assign_alias to create or update resources in eToro MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your eToro MCP Server environment.
This tool creates or modifies deployment configuration by assigning aliases. While aliases can typically be removed or reassigned (making this reversible), it does alter the deployment's state and configuration. This fits the Write category rather than Read (which would only retrieve data) or Execute (which would trigger external operations with unpredictable side effects).
From the tool's definition "Creates a new alias for the deployment" - this operation modifies deployment configuration by adding a new alias, which is a reversible write operation. The tool name "assign_alias" and description clearly indicate creation/assignment of a new alias.
Documented attack patterns abuse exactly the kind of access assign_alias gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and eToro MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for assign_alias:
{
"version": "1",
"default": "deny",
"tools": {
"assign_alias": {
"limits": [
{
"counter": "assign_alias_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}assign_alias 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 alias for the deployment with the given deployment ID. It is categorised as a Write tool in the eToro MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the eToro MCP Server MCP server in PolicyLayer and add a rule for assign_alias: 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 eToro MCP Server. Nothing to install.
assign_alias 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 assign_alias 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 assign_alias. 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.
assign_alias is provided by the eToro MCP Server MCP server (shlomico-tr/etoroportfoliomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from eToro MCP Server, 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.
154 eToro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.