meta-ads-mcp

list_account_users

Retrieve all users with access to a Meta ad account, including their roles and permissions. Use account_id to query a specific account or fall back to META_AD_ACCOUNT_ID.

Instructions

List users who have access to the ad account with their roles and permissions.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_account_users"
  }
}

Input Schema

Name	Required	Description
`after`	No	Pagination cursor for next page
`limit`	No	Number of results (default 25)
`fields`	No	Comma-separated fields to return
`account_id`	No	Ad account ID to query (e.g. 'act_123' or '123'). Falls back to META_AD_ACCOUNT_ID env var if omitted.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.6.1Oct 21, 2026

addedInput schema / properties / account_id

Added value: +{
+  "description": "Ad account ID to query (e.g. 'act_123' or '123'). Falls back to META_AD_ACCOUNT_ID env var if omitted.",
+  "type": "string"
+}

First observedv1.2.0Mar 19, 2026

TDQS

C2.9/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full behavioral burden and largely does not meet it. It never states that this is a read-only listing, how pagination behaves, rate limits, or the env-var fallback for account_id. Only the implicit 'List' verb hints at a non-mutating operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single tight sentence with the resource front-loaded and zero filler. It is appropriately sized, though it says almost nothing beyond the essentials.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple four-parameter read with no output schema and no annotations, the description covers what is returned (roles and permissions) but omits pagination expectations and the account_id fallback. Adequate but with visible gaps given the total reliance on prose.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so all four parameters (after, limit, fields, account_id) are already documented in the schema. The description adds nothing about parameter meaning, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('List') and resource ('users who have access to the ad account') and even states the returned shape (roles and permissions). It does not explicitly distinguish itself from the nearby sibling list_business_users, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use guidance, no prerequisites, and no named alternative. An agent cannot tell from the text whether this belongs at account level versus the business-level user listing siblings.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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