Creates a new list. Once you have your list, add attributes to it using the [Create attribute](/rest-api/endpoint-reference/attributes/create-an-attribute) API, and add records to it using the [Add records to list](/rest-api/endpoint-reference/entries/create-an-entry-add-record-to-list) API. New ...
AI agents use postv2lists to create or update resources in Attio — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Attio environment.
This tool creates new data (lists) in the Attio system, which is a reversible modification operation. It falls under Write category rather than Read (no data retrieval) or Destructive (data creation is reversible). Severity is medium because creating new lists could affect organizational data structure and workflows, but the impact is limited in scope and reversible—users can delete lists if needed.
From the tool's definition Tool name 'postv2lists' and description states 'Creates a new list', which is a create operation that modifies data within Attio by adding a new list object.
Documented attack patterns abuse exactly the kind of access postv2lists gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Attio, and nothing reaches the server without passing your rules. This is the rule we recommend for postv2lists:
{
"version": "1",
"default": "deny",
"tools": {
"postv2lists": {
"limits": [
{
"counter": "postv2lists_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}postv2lists 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 list. Once you have your list, add attributes to it using the [Create attribute](/rest-api/endpoint-reference/attributes/create-an-attribute) API, and add records to it using the [Add records to list](/rest-api/endpoint-reference/entries/create-an-entry-add-record-to-list) API. New lists must specify which records can be added with the \. It is categorised as a Write tool in the Attio MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Attio MCP server in PolicyLayer and add a rule for postv2lists: 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 Attio. Nothing to install.
postv2lists 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 postv2lists 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 postv2lists. 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.
postv2lists is provided by the Attio MCP server (itsbrex/attio-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Attio, 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.
57 Attio tools catalogued and risk-classified — across an index of 43,000+ MCP servers.