diff --git a/docs/source/api/capabilities_name.rst b/docs/source/api/capabilities_name.rst
index f82c186810..9ece17798b 100644
--- a/docs/source/api/capabilities_name.rst
+++ b/docs/source/api/capabilities_name.rst
@@ -18,9 +18,14 @@
 *************************
 ``capabilities/{{name}}``
 *************************
+.. deprecated:: ATCv4
+	As of ATC version 4.0, every method of this endpoint is deprecated. See each method for details.
 
 ``GET``
 =======
+.. deprecated:: ATCv4
+	This method of this endpoint is deprecated, please use the 'name' parameter of a ``GET`` request to :ref:`to-api-capabilities` instead.
+
 Get a capability by name.
 
 :Auth. Required: Yes
@@ -37,6 +42,16 @@ Request Structure
 	| name | The name of the capability of interest |
 	+------+----------------------------------------+
 
+.. code-block:: http
+	:caption: Request Example
+
+	GET /api/1.5/capabilities/testquest HTTP/1.1
+	User-Agent: python-requests/2.22.0
+	Accept-Encoding: gzip, deflate
+	Accept: */*
+	Connection: keep-alive
+	Cookie: mojolicious=...
+
 Response Structure
 ------------------
 :description: Describes the APIs covered by the capability
@@ -52,25 +67,34 @@ Response Structure
 	Access-Control-Allow-Methods: POST,GET,OPTIONS,PUT,DELETE
 	Access-Control-Allow-Origin: *
 	Cache-Control: no-cache, no-store, max-age=0, must-revalidate
+	Content-Encoding: gzip
+	Content-Length: 221
 	Content-Type: application/json
-	Date: Wed, 14 Nov 2018 20:37:17 GMT
+	Date: Wed, 29 Jan 2020 20:49:49 GMT
 	Server: Mojolicious (Perl)
-	Set-Cookie: mojolicious=...; Path=/; Expires=Mon, 18 Nov 2019 17:40:54 GMT; Max-Age=3600; HttpOnly
+	Set-Cookie: mojolicious=...; expires=Thu, 30 Jan 2020 00:49:49 GMT; path=/; HttpOnly
 	Vary: Accept-Encoding
-	Whole-Content-Sha512: 0YBTC5TEAOJ6B8gsaKgOD1ni2hnZ8Kh9u2JhcmExoGIPaMEKpp4Omr4FglkOQZuh/IB90eJjBMNMeCEvZCxWRg==
-	Content-Length: 167
 
-	{ "response": [
+	{ "alerts": [
+		{
+			"level": "warning",
+			"text": "This endpoint is deprecated, please use 'GET /capabilities with the 'name' query parameter' instead"
+		}
+	],
+	"response": [
 		{
-			"lastUpdated": "2018-11-14 20:33:00.275376+00",
-			"name": "test",
-			"description": "This is only a test. If this were a real capability, it might do something"
+			"lastUpdated": "2020-01-29 20:10:53.821978+00",
+			"name": "testquest",
+			"description": "A test capability for API examples"
 		}
 	]}
 
 
 ``PUT``
 =======
+.. deprecated:: ATCv4
+	This method of this endpoint is deprecated. In the future, Capabilities will be immutable, and so no alternative is offered.
+
 Edit a capability.
 
 :Auth. Required: Yes
@@ -92,15 +116,15 @@ Request Structure
 .. code-block:: http
 	:caption: Request Example
 
-	PUT /api/1.4/capabilities/test HTTP/1.1
-	Host: trafficops.infra.ciab.test
-	User-Agent: curl/7.47.0
+	PUT /api/1.5/capabilities/testquest HTTP/1.1
+	User-Agent: python-requests/2.22.0
+	Accept-Encoding: gzip, deflate
 	Accept: */*
+	Connection: keep-alive
 	Cookie: mojolicious=...
-	Content-Length: 45
-	Content-Type: application/json
+	Content-Length: 36
 
-	{"description": "A much shorter description"}
+	{"description": "A new description"}
 
 Response Structure
 ------------------
@@ -117,29 +141,36 @@ Response Structure
 	Access-Control-Allow-Methods: POST,GET,OPTIONS,PUT,DELETE
 	Access-Control-Allow-Origin: *
 	Cache-Control: no-cache, no-store, max-age=0, must-revalidate
+	Content-Encoding: gzip
+	Content-Length: 224
 	Content-Type: application/json
-	Date: Wed, 14 Nov 2018 20:40:33 GMT
+	Date: Wed, 29 Jan 2020 21:25:10 GMT
 	Server: Mojolicious (Perl)
-	Set-Cookie: mojolicious=...; Path=/; Expires=Mon, 18 Nov 2019 17:40:54 GMT; Max-Age=3600; HttpOnly
+	Set-Cookie: mojolicious=...; expires=Thu, 30 Jan 2020 01:25:10 GMT; path=/; HttpOnly
 	Vary: Accept-Encoding
-	Whole-Content-Sha512: +5mLZ/CJnDkJMbnFviXtVdjwt4bu7ykiMIs73zsnuKV/k4q/d025b2pjYDQkSgtfWPJ73FcusAuBM9TCVT3KsA==
-	Content-Length: 181
 
 	{ "alerts": [
 		{
 			"level": "success",
 			"text": "Capability was updated."
+		},
+		{
+			"level": "warning",
+			"text": "This endpoint and its functionality is deprecated, and will be removed in the future"
 		}
 	],
 	"response": {
-		"lastUpdated": "2018-11-14 20:33:00.275376+00",
-		"name": "test",
-		"description": "A much shorter description"
+		"lastUpdated": "2020-01-29 21:24:56.361518+00",
+		"name": "testquest",
+		"description": "A new description"
 	}}
 
 
 ``DELETE``
 ==========
+.. deprecated:: ATCv4
+	This method of this endpoint is deprecated. In the future, Capabilities will be immutable, and so no alternative is offered.
+
 Delete a capability.
 
 :Auth. Required: Yes
@@ -156,6 +187,18 @@ Request Structure
 	| ``name``        | yes      | Capability name.                               |
 	+-----------------+----------+------------------------------------------------+
 
+.. code-block:: http
+	:caption: Request Example
+
+	DELETE /api/1.5/capabilities/testquest HTTP/1.1
+	User-Agent: python-requests/2.22.0
+	Accept-Encoding: gzip, deflate
+	Accept: */*
+	Connection: keep-alive
+	Cookie: mojolicious=...
+	Content-Length: 0
+
+
 Response Structure
 ------------------
 .. code-block:: http
@@ -167,18 +210,21 @@ Response Structure
 	Access-Control-Allow-Methods: POST,GET,OPTIONS,PUT,DELETE
 	Access-Control-Allow-Origin: *
 	Cache-Control: no-cache, no-store, max-age=0, must-revalidate
+	Content-Encoding: gzip
+	Content-Length: 146
 	Content-Type: application/json
-	Date: Wed, 14 Nov 2018 20:45:37 GMT
+	Date: Wed, 29 Jan 2020 21:27:57 GMT
 	Server: Mojolicious (Perl)
-	Set-Cookie: mojolicious=...; Path=/; Expires=Mon, 18 Nov 2019 17:40:54 GMT; Max-Age=3600; HttpOnly
+	Set-Cookie: mojolicious=...; expires=Thu, 30 Jan 2020 01:27:57 GMT; path=/; HttpOnly
 	Vary: Accept-Encoding
-	Whole-Content-Sha512: IlAiV4ebwTpMIgeYlR5RuwOhwmHsFs8Ekt7AaEDb3v+lXjvjkqU98xFsfNWvpvPbT/iJnotENhtVq8TVdvoPLg==
-	Content-Length: 61
 
 	{ "alerts": [
 		{
 			"level": "success",
 			"text": "Capability deleted."
+		},
+		{
+			"level": "warning",
+			"text": "This endpoint and its functionality is deprecated, and will be removed in the future"
 		}
 	]}
-
diff --git a/traffic_ops/app/lib/API/Capability.pm b/traffic_ops/app/lib/API/Capability.pm
index 53d9b47309..4019fd5875 100644
--- a/traffic_ops/app/lib/API/Capability.pm
+++ b/traffic_ops/app/lib/API/Capability.pm
@@ -46,9 +46,11 @@ sub name {
 	my $self = shift;
 	my $name = $self->param('name');
 
+	my $alt = "GET /capabilities with the 'name' query parameter";
+
 	my $rs_data = $self->db->resultset("Capability")->search( 'me.name' => $name );
 	if ( !defined($rs_data) ) {
-		return $self->not_found();
+		return $self->with_deprecation("Resource not found.", "error", 404, $alt);
 	}
 	my @data = ();
 	while ( my $row = $rs_data->next ) {
@@ -60,7 +62,7 @@ sub name {
 			}
 		);
 	}
-	$self->success( \@data );
+	$self->deprecation(200, $alt, \@data );
 }
 
 sub create {
@@ -119,22 +121,22 @@ sub update {
 	my $params = $self->req->json;
 
 	if ( !&is_oper($self) ) {
-		return $self->forbidden();
+		return $self->with_deprecation_with_no_alternative("Forbidden", "error", 403);
 	}
 
 	if ( !defined($params) ) {
-		return $self->alert("Parameters must be in JSON format.");
+		return $self->with_deprecation_with_no_alternative("Parameters must be in JSON format.", "error", 400);
 	}
 
 	my $description = $params->{description} if defined( $params->{description} );
 
 	my $capability = $self->db->resultset('Capability')->find( { name => $name } );
 	if ( !defined($capability) ) {
-		return $self->not_found();
+		return $self->with_deprecation_with_no_alternative("Resource not found.", "error", 404);
 	}
 
 	if ( !defined($description) or $description eq "" ) {
-		return $self->alert("Description is required.");
+		return $self->with_deprecation_with_no_alternative("Description is required.", "error", 400);
 	}
 
 	my $values = { description => $description };
@@ -148,10 +150,10 @@ sub update {
 
 		&log( $self, "Updated Capability: '$response->{name}', '$response->{description}'", "APICHANGE" );
 
-		return $self->success( $response, "Capability was updated." );
+		return $self->with_deprecation_with_no_alternative("Capability was updated.", "success", 200, $response);
 	}
 	else {
-		return $self->alert("Capability update failed.");
+		return $self->with_deprecation_with_no_alternative("Capability update failed.", "error", 400);
 	}
 }
 
@@ -160,27 +162,27 @@ sub delete {
 	my $name = $self->param('name');
 
 	if ( !&is_oper($self) ) {
-		return $self->forbidden();
+		return $self->with_deprecation_with_no_alternative("Forbidden", "error", 403);
 	}
 
 	my $capability = $self->db->resultset('Capability')->find( { name => $name } );
 	if ( !defined($capability) ) {
-		return $self->not_found();
+		return $self->with_deprecation_with_no_alternative("Resource not found.", "error", 404);
 	}
 
 	# make sure no api_capability refers to this capability
 	my $rs_data = $self->db->resultset("ApiCapability")->find( { 'me.capability' => $name } );
 	if ( defined($rs_data) ) {
 		my $reference_id = $rs_data->id;
-		return $self->alert("Capability \'$name\' is refered by an api_capability mapping: $reference_id. Deletion failed.");
+		return $self->with_deprecation_with_no_alternative("Capability \'$name\' is refered by an api_capability mapping: $reference_id. Deletion failed.", "error", 400);
 	}
 
 	my $rs = $capability->delete();
 	if ($rs) {
-		return $self->success_message("Capability deleted.");
+		return $self->with_deprecation_with_no_alternative("Capability deleted.", "success", 200);
 	}
 	else {
-		return $self->alert("Capability deletion failed.");
+		return $self->with_deprecation_with_no_alternative("Capability deletion failed.", "error", 400);
 	}
 }
 
diff --git a/traffic_ops/app/lib/MojoPlugins/Response.pm b/traffic_ops/app/lib/MojoPlugins/Response.pm
index d636ab5fb4..6dcd75d8bb 100644
--- a/traffic_ops/app/lib/MojoPlugins/Response.pm
+++ b/traffic_ops/app/lib/MojoPlugins/Response.pm
@@ -187,6 +187,25 @@ sub register {
 		}
 	);
 
+	$app->renderer->add_helper(
+		with_deprecation_with_no_alternative => sub {
+			my $self = shift || confess("Call on an instance of MojoPlugins::Response");
+			my $alert = shift || confess("Please supply an alert string");
+			my $level = shift || confess("Please supply an alert level such as 'error' or 'warning'");
+			my $code = shift || confess("Please supply a response code e.g. 400");
+			my $response_object = shift;
+
+			my $builder ||= MojoPlugins::Response::Builder->new($self, @_);
+			my @alerts_response = ({$LEVEL_KEY => $level, $TEXT_KEY => $alert}, {$LEVEL_KEY => $WARNING_LEVEL, $TEXT_KEY => "This endpoint and its functionality is deprecated, and will be removed in the future"});
+
+			if (defined($response_object)) {
+				return $self->render( $STATUS_KEY => $code, $JSON_KEY => { $ALERTS_KEY => \@alerts_response, $RESPONSE_KEY => $response_object } );
+			} else {
+				return $self->render( $STATUS_KEY => $code, $JSON_KEY => { $ALERTS_KEY => \@alerts_response } );
+			}
+		}
+	);
+
 	# Alerts (500)
 	$app->renderer->add_helper(
 		internal_server_error => sub {