AI agents call list_brand_accounts to retrieve information from Posterly without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns information about connected social accounts without modifying, deleting, or executing any operations. It is a straightforward data retrieval function that has no side effects. The low severity reflects minimal blast radius if misused — an agent would only gain visibility into which accounts are connected to a brand, not the ability to modify, delete, or act upon those accounts.
From the tool's definition Tool name is 'list_brand_accounts' and description states 'List the connected social accounts assigned to a brand/client' — the verb 'list' and action of retrieving account information with no modification capability indicates a read-only query operation.
Attacks that exploit this kind of access
List the connected social accounts assigned to a brand/client. Use this when a user refers to a brand name rather than a raw account handle. It is categorised as a Read tool in the Posterly MCP Server, which means it retrieves data without modifying state.
Register the Posterly MCP server in PolicyLayer and add a rule for list_brand_accounts: 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 Posterly. Nothing to install.
list_brand_accounts is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_brand_accounts 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 list_brand_accounts. 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.
list_brand_accounts is provided by the Posterly MCP server (posterly-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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