ECS operations

Category	✅ Supported	❌ Unsupported
General	40	8

Operation	Status	Notes	AWS Docs
CreateCapacityProvider	✅ Supported	FARGATE and FARGATE_SPOT built-ins seeded automatically; rejects FARGATE* prefix for custom providers	docs
CreateCluster	✅ Supported	Defaults name to “default” if empty	docs
CreateService	✅ Supported	Validates cluster + task def; creates PRIMARY deployment with rolloutState; scheduler starts Docker-backed tasks carrying the service networkConfiguration, ENI attachment and deployment ID in startedBy; networkConfiguration required when the task definition’s networkMode is awsvpc; deploymentController defaults to ECS; failed placements are recorded as service events and a FAILED rollout when a deploymentCircuitBreaker is enabled	docs
CreateTaskSet	✅ Supported	Requires CODE_DEPLOY or EXTERNAL deployment controller; Scale defaults to 100%; ComputedDesiredCount calculated from scale	docs
DeleteAccountSetting	✅ Supported	Removes override; subsequent reads return the hardcoded default	docs
DeleteAttributes	❌ Unsupported	stub; returns 501	docs
DeleteCluster	✅ Supported	Sets status INACTIVE	docs
DeleteService	✅ Supported	Sets DRAINING, desired=0; reconciler stops excess tasks	docs
DeleteTaskSet	✅ Supported	Returns DRAINING status; removes from service task set list	docs
DeregisterContainerInstance	✅ Supported	Removes from store; returns INACTIVE instance	docs
DeregisterTaskDefinition	✅ Supported	Marks INACTIVE	docs
DescribeCapacityProviders	✅ Supported	Filter by name or return all; failures array for missing providers	docs
DescribeClusters	✅ Supported	By name or ARN; returns failures for missing	docs
DescribeContainerInstances	✅ Supported	By ARN; failures array for missing	docs
DescribeServices	✅ Supported	By name or ARN; recounts task state; returns failures for missing	docs
DescribeTaskDefinition	✅ Supported	By family, family:rev, or ARN	docs
DescribeTaskSets	✅ Supported	Filter by task set ID or ARN; returns failures for missing	docs
DescribeTasks	✅ Supported	By task ID or ARN; returns failures for missing	docs
DiscoverPollEndpoint	❌ Unsupported	stub; returns 501	docs
ExecuteCommand	❌ Unsupported	stub; returns 501	docs
ListAccountSettings	✅ Supported	Returns all known settings with effective values; filter by name; hardcoded defaults	docs
ListAttributes	❌ Unsupported	stub; returns 501	docs
ListClusters	✅ Supported		docs
ListContainerInstances	✅ Supported	Filter by cluster and optional status	docs
ListServices	✅ Supported	Filter by cluster; optional launchType filter	docs
ListTagsForResource	✅ Supported	List tags for an ECS resource	docs
ListTaskDefinitionFamilies	✅ Supported	Optional familyPrefix filter	docs
ListTaskDefinitions	✅ Supported	Optional familyPrefix filter	docs
ListTasks	✅ Supported	Filter by cluster, desiredStatus, family	docs
PutAccountSetting	✅ Supported	Stores override for the caller; no per-principal scoping in emulator	docs
PutAccountSettingDefault	✅ Supported	Identical to PutAccountSetting in emulator (no principal distinction)	docs
PutAttributes	❌ Unsupported	stub; returns 501	docs
PutClusterCapacityProviders	✅ Supported	Associates providers and default strategy with a cluster	docs
RegisterContainerInstance	✅ Supported	Metadata-only; auto-generates ARN; status ACTIVE; agentConnected true	docs
RegisterTaskDefinition	✅ Supported	Family:revision versioning; Fargate: validates awsvpc networkMode, cpu/memory required with valid combos, rejects host.sourcePath and dockerVolumeConfiguration as AWS does; all four volume shapes honoured at placement (EFS, host.sourcePath binds, dockerVolumeConfiguration, name-only scratch); tags stored against the revision’s ARN, including overcast:hot-reload-path	docs
RunTask	✅ Supported	Docker-backed when available, metadata-only when no container runtime is wired; a task whose containers fail to start is STOPPED with stopCode TaskFailedToStart rather than reported RUNNING; async state transitions; networkConfiguration required when the task definition’s networkMode is awsvpc, synthetic ENI attachment returned, platformVersion defaults to LATEST; awsvpc task containers share one network namespace and address; each lastStatus transition emits an ECS Task State Change event to the default EventBridge bus; emulator-only and off by default, a task definition tagged overcast:debug=true (or overcast:debug/=true) under OVERCAST_ECS_DEBUGGER=true gets a step debugger port per named container, published on the task’s network namespace and released when the task stops — never observable on the AWS API, and a second running task of the same definition runs undebugged (#1939)	docs
StartTask	❌ Unsupported	stub; returns 501	docs
StopTask	✅ Supported	Stops Docker containers; sets STOPPED with stopCode UserInitiated; cancels pending transitions; emits an ECS Task State Change event to the default EventBridge bus	docs
TagResource	✅ Supported	Add tags to any ECS resource by ARN	docs
UntagResource	✅ Supported	Remove tags by key	docs
UpdateCapacityProvider	✅ Supported	Rejects updates to built-in FARGATE/FARGATE_SPOT providers	docs
UpdateCluster	✅ Supported	Validates cluster exists; returns current state	docs
UpdateClusterSettings	✅ Supported	Accepts settings array (metadata only)	docs
UpdateContainerAgent	❌ Unsupported	stub; returns 501	docs
UpdateContainerInstancesState	❌ Unsupported	stub; returns 501	docs
UpdateService	✅ Supported	Update desiredCount and/or taskDefinition; task definition changes and forceNewDeployment start a new deployment whose tasks refresh launch-time secrets and mutable image tags; propagates networkConfiguration/platformVersion; the rollout honours deploymentConfiguration maximumPercent/minimumHealthyPercent	docs
UpdateServicePrimaryTaskSet	✅ Supported	Promotes target to PRIMARY; demotes all other task sets to ACTIVE	docs
UpdateTaskSet	✅ Supported	Updates Scale and recalculates ComputedDesiredCount	docs