# Add IAM user to group

Canonical URL: https://docs.fuse.init.inc/integrations/aws/actions/iam.groups.members.add

Add an IAM user to a group. Requires iam:AddUserToGroup.

Action ID: `iam.groups.members.add`
Provider: AWS (`aws`)
Contract version: 1

## Risk and exposure

- Risk: Write
- Idempotency: Safe — Safe to retry without coordination; repeats do not create additional side effects.
- Availability: Default
- Exposure: REST, SDK
- MCP hints: readOnly=false, destructive=false, idempotent=true, openWorld=true

## Required scopes

- `iam:AddUserToGroup`

## Input schema fields

- `group_name`
- `user_name`

## Output schema fields

None.

Provider overview: https://docs.fuse.init.inc/integrations/aws
Actions index: https://docs.fuse.init.inc/integrations/aws/actions
Exact canonical JSON contract: https://docs.fuse.init.inc/api/catalog/v1/providers/aws/actions/iam.groups.members.add
Deployment-effective discovery: https://api.fuse.init.inc/v1/tenants/%7Btenant_id%7D/providers/aws/actions