Get the Instagram username for a given user ID. Args: user_id: Instagram user ID. Returns: A dictionary with success status and the username or error message.
AI agents call get_username_from_user_id to retrieve information from Instagram DM MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a simple data retrieval tool that maps a user ID to a username. It queries existing data without modifying state, triggering actions, or committing resources. The blast radius of misuse is minimal—an attacker could discover usernames from IDs they already possess, but this is low-impact reconnaissance. Classified as Read with low severity.
From the tool's definition Tool performs a lookup/retrieval operation ("Get the Instagram username") with no side effects. Returns data without modifying, deleting, or executing actions.
Documented attack patterns abuse exactly the kind of access get_username_from_user_id gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Instagram DM MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_username_from_user_id:
{
"version": "1",
"default": "deny",
"tools": {
"get_username_from_user_id": {}
}
}get_username_from_user_id is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the Instagram username for a given user ID. Args: user_id: Instagram user ID. Returns: A dictionary with success status and the username or error message. It is categorised as a Read tool in the Instagram DM MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Instagram DM MCP Server MCP server in PolicyLayer and add a rule for get_username_from_user_id: 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 Instagram DM MCP Server. Nothing to install.
get_username_from_user_id 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 get_username_from_user_id 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 get_username_from_user_id. 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.
get_username_from_user_id is provided by the Instagram DM MCP Server MCP server (trypeggy/instagram_dm_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Instagram DM MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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25 Instagram DM MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.