# SNS operations 22 of 30 listed operations are implemented. Back to [SNS](/docs/services/sns/index.md). ## Summary | Category | ✅ Supported | ⚠️ Partial | ❌ Unsupported | | --- | --- | --- | --- | | Topics | 8 | | | | Subscriptions | 7 | | | | Publishing | 5 | 1 | | | Platform applications (mobile push) | | | 5 | | SMS | 1 | | 3 | --- ## Endpoints ### Topics | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `CreateTopic` | ✅ Supported | Idempotent; attributes stored; inline `Tags` applied at creation and left untouched by a repeat call | [docs](https://docs.aws.amazon.com/sns/latest/api/API_CreateTopic.html) | | `DeleteTopic` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_DeleteTopic.html) | | `GetTopicAttributes` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_GetTopicAttributes.html) | | `SetTopicAttributes` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_SetTopicAttributes.html) | | `ListTopics` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListTopics.html) | | `TagResource` | ✅ Supported | Tags are stored on the topic; member-indexed form encoding | [docs](https://docs.aws.amazon.com/sns/latest/api/API_TagResource.html) | | `UntagResource` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_UntagResource.html) | | `ListTagsForResource` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListTagsForResource.html) | ### Subscriptions | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `Subscribe` | ✅ Supported | Protocols: `sqs`, `sms`, `email`, `email-json`, `http`, `https`, `lambda`. `application` and `firehose` return 400. | [docs](https://docs.aws.amazon.com/sns/latest/api/API_Subscribe.html) | | `ConfirmSubscription` | ✅ Supported | Emulator auto-confirms; any token accepted | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ConfirmSubscription.html) | | `Unsubscribe` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_Unsubscribe.html) | | `ListSubscriptions` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListSubscriptions.html) | | `ListSubscriptionsByTopic` | ✅ Supported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListSubscriptionsByTopic.html) | | `GetSubscriptionAttributes` | ✅ Supported | Returns SubscriptionArn, TopicArn, Protocol, Endpoint, Owner + custom attributes | [docs](https://docs.aws.amazon.com/sns/latest/api/API_GetSubscriptionAttributes.html) | | `SetSubscriptionAttributes` | ✅ Supported | Stores any attribute; FilterPolicy drives message filtering, RedrivePolicy the subscription dead-letter queue | [docs](https://docs.aws.amazon.com/sns/latest/api/API_SetSubscriptionAttributes.html) | ### Publishing | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `Publish` | ✅ Supported | TopicArn/PhoneNumber/TargetArn destination selection (exactly one required); MessageStructure=json per-protocol payload selection; Message (256 KB) and Subject (<100 chars, no control/line-break chars) validation; async fan-out to `sqs`, `lambda`, `email`, `email-json`, `http`, `https`, and `sms` subscribers; records AWS/SNS CloudWatch metrics NumberOfMessagesPublished and PublishSize on accept, and NumberOfNotificationsDelivered/NumberOfNotificationsFailed per subscription delivery attempt — a delivery whose protocol dependency was never wired into this instance (nil enqueuer/mailer/smsSender/outbound) is treated as a delivery failure like any other protocol's: failDelivery runs (recording NumberOfNotificationsFailed, redirecting to the subscription's DLQ when configured), with a one-time Warn per (topic, protocol) telling the operator what to wire (#1306) | [docs](https://docs.aws.amazon.com/sns/latest/api/API_Publish.html) | | `PublishBatch` | ✅ Supported | Up to 10 messages; each entry independently validated (Message/Subject/MessageStructure=json), a bad entry fails without aborting the batch; records NumberOfMessagesPublished/PublishSize per successful entry | [docs](https://docs.aws.amazon.com/sns/latest/api/API_PublishBatch.html) | | `Message filtering (subscription filter policy)` | ✅ Supported | String/Number attribute value matching via FilterPolicy on SetSubscriptionAttributes | [docs](https://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html) | | `Lambda subscription delivery` | ✅ Supported | Publish invokes the subscribed function asynchronously with the AWS `Records[].Sns` event; RawMessageDelivery does not apply to `lambda`, matching AWS | [docs](https://docs.aws.amazon.com/sns/latest/dg/sns-lambda-as-subscriber.html) | | `Subscription dead-letter queue (RedrivePolicy)` | ✅ Supported | A delivery that fails is redirected to the SQS queue named by the subscription's RedrivePolicy | [docs](https://docs.aws.amazon.com/sns/latest/dg/sns-dead-letter-queues.html) | | `FIFO topic Publish parameters` | ⚠️ Partial | MessageGroupId/MessageDeduplicationId are required and validated for a topic named `*.fifo` (or ContentBasedDeduplication substitutes for the dedup ID); actual FIFO ordering, deduplication, and SequenceNumber generation remain unimplemented | [docs](https://docs.aws.amazon.com/sns/latest/api/API_Publish.html) | ### Platform applications (mobile push) | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `CreatePlatformApplication` | ❌ Unsupported | APNs, GCM/FCM, ADM | [docs](https://docs.aws.amazon.com/sns/latest/api/API_CreatePlatformApplication.html) | | `DeletePlatformApplication` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_DeletePlatformApplication.html) | | `ListPlatformApplications` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListPlatformApplications.html) | | `CreatePlatformEndpoint` | ❌ Unsupported | Device registration | [docs](https://docs.aws.amazon.com/sns/latest/api/API_CreatePlatformEndpoint.html) | | `PublishToEndpoint` | ❌ Unsupported | via Publish with TargetArn; returns 400 InvalidParameter explicitly rather than a generic missing-TopicArn error | [docs](https://docs.aws.amazon.com/sns/latest/dg/mobile-push-send-directmessage.html) | ### SMS | Operation | Status | Notes | AWS Docs | | --- | --- | --- | --- | | `SMS publish` | ✅ Supported | via sms subscription on Publish, or directly via Publish with PhoneNumber (no topic involved); captured in the Inbox with kind=sms | [docs](https://docs.aws.amazon.com/sns/latest/dg/sns-mobile-phone-number-as-subscriber.html) | | `CheckIfPhoneNumberIsOptedOut` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_CheckIfPhoneNumberIsOptedOut.html) | | `ListPhoneNumbersOptedOut` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_ListPhoneNumbersOptedOut.html) | | `OptInPhoneNumber` | ❌ Unsupported | | [docs](https://docs.aws.amazon.com/sns/latest/api/API_OptInPhoneNumber.html) | ## Related - [SNS](/docs/services/sns/index.md) — quick start, what works, and the differences from AWS - [All service pages](/docs/services/index.md)