add_user_to_group

Part of the AWS IAM MCP Server MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents use add_user_to_group to create or modify resources in AWS IAM MCP Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON ADD_USER_TO_GROUP

Without a policy, an AI agent could call add_user_to_group repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach AWS IAM MCP Server.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

aws-iam-mcp-server.yaml

tools:
  add_user_to_group:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full AWS IAM MCP Server policy for all 29 tools.

// DETAILS

Tool Name add_user_to_group

Category Write

MCP Server AWS IAM MCP Server MCP Server

Risk Level Medium

// MORE AWS IAM MCP SERVER TOOLS

Destructive delete_access_key Destructive delete_group Destructive delete_role_policy Destructive delete_user Destructive delete_user_policy Destructive remove_user_from_group Write attach_group_policy Write attach_user_policy

View all 29 tools →

// WHAT CAN GO WRONG

Agents calling write-class tools like add_user_to_group have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

Firecrawl Web Scraping Server firecrawl_generate_llmstxt AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update

// RELATED READING

// FAQ

What does the add_user_to_group tool do? +

Add a user to an IAM group. Args: group_name: The name of the IAM group user_name: The name of the IAM user confirmed: Must be true to confirm this write operation Returns: GroupMembershipResponse containing operation status. It is categorised as a Write tool in the AWS IAM MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_user_to_group? +

Add a rule in your Intercept YAML policy under the tools section for add_user_to_group. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the AWS IAM MCP Server MCP server.

What risk level is add_user_to_group? +

add_user_to_group is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_user_to_group? +

Yes. Add a rate_limit block to the add_user_to_group rule in your Intercept 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.

How do I block add_user_to_group completely? +

Set action: deny in the Intercept policy for add_user_to_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.

What MCP server provides add_user_to_group? +

add_user_to_group is provided by the AWS IAM MCP Server MCP server (awslabs.iam-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

add_user_to_group

Let agents act without letting them run wild.