AI agents use update_access_group 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 modifies existing access group configurations, which is a Write operation. The severity is medium because unauthorized updates to access groups could grant unintended permissions to users or restrict legitimate access, affecting multiple parties, but the changes are theoretically reversible.
From the tool's definition Tool name 'update_access_group' and description 'Update an access group' indicate modification of access control settings. The verb 'Update' confirms reversible data modification rather than creation or deletion.
Documented attack patterns abuse exactly the kind of access update_access_group 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 update_access_group:
{
"version": "1",
"default": "deny",
"tools": {
"update_access_group": {
"limits": [
{
"counter": "update_access_group_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_access_group 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.
Update an access group. 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 update_access_group: 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.
update_access_group 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 update_access_group 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 update_access_group. 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.
update_access_group 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.