diff --git a/doc/manual/src/notifications.md b/doc/manual/src/notifications.md
index a2569172..f1203af8 100644
--- a/doc/manual/src/notifications.md
+++ b/doc/manual/src/notifications.md
@@ -63,7 +63,7 @@ It is possible for subsequent deliveries of the same `build_finished` data to im
 
 ### `eval_added`
 
-* **Payload:** Exactly two values, separated by the two-character string `\t` (ie: not a tab): an opaque trace ID representing this evaluation, and the ID of the JobsetEval record.
+* **Payload:** Exactly three values, tab separated: an opaque trace ID representing this evaluation, the ID of the jobset, and the ID of the JobsetEval record.
 * **When:** After the evaluator fetches inputs and completes the evaluation successfully.
 * **Delivery Semantics:** Ephemeral. `hydra-notify` must be running to react to this event. No record of this event is stored.
 
diff --git a/src/lib/Hydra/Event.pm b/src/lib/Hydra/Event.pm
index 0d50235e..9faf02e9 100644
--- a/src/lib/Hydra/Event.pm
+++ b/src/lib/Hydra/Event.pm
@@ -7,6 +7,7 @@ use Hydra::Event::BuildQueued;
 use Hydra::Event::BuildStarted;
 use Hydra::Event::CachedBuildFinished;
 use Hydra::Event::CachedBuildQueued;
+use Hydra::Event::EvalAdded;
 use Hydra::Event::EvalCached;
 use Hydra::Event::EvalFailed;
 use Hydra::Event::EvalStarted;
@@ -18,6 +19,7 @@ my %channels_to_events = (
   build_started => \&Hydra::Event::BuildStarted::parse,
   cached_build_finished => \&Hydra::Event::CachedBuildFinished::parse,
   cached_build_queued => \&Hydra::Event::CachedBuildQueued::parse,
+  eval_added => \&Hydra::Event::EvalAdded::parse,
   eval_cached => \&Hydra::Event::EvalCached::parse,
   eval_failed => \&Hydra::Event::EvalFailed::parse,
   eval_started => \&Hydra::Event::EvalStarted::parse,
diff --git a/src/lib/Hydra/Event/EvalAdded.pm b/src/lib/Hydra/Event/EvalAdded.pm
new file mode 100644
index 00000000..fb3a4a8f
--- /dev/null
+++ b/src/lib/Hydra/Event/EvalAdded.pm
@@ -0,0 +1,63 @@
+package Hydra::Event::EvalAdded;
+
+use strict;
+use warnings;
+
+sub parse :prototype(@) {
+    unless (@_ == 3) {
+        die "eval_added: payload takes exactly three arguments, but ", scalar(@_), " were given";
+    }
+
+    my ($trace_id, $jobset_id, $evaluation_id) = @_;
+
+    unless ($jobset_id =~ /^\d+$/) {
+        die "eval_added: payload argument jobset_id should be an integer, but '", $jobset_id, "' was given"
+    }
+    unless ($evaluation_id =~ /^\d+$/) {
+        die "eval_added: payload argument evaluation_id should be an integer, but '", $evaluation_id, "' was given"
+    }
+
+    return Hydra::Event::EvalAdded->new($trace_id, int($jobset_id), int($evaluation_id));
+}
+
+sub new {
+    my ($self, $trace_id, $jobset_id, $evaluation_id) = @_;
+    return bless {
+        "trace_id" => $trace_id,
+        "jobset_id" => $jobset_id,
+        "evaluation_id" => $evaluation_id,
+        "jobset" => undef,
+        "evaluation" => undef
+    }, $self;
+}
+
+sub interestedIn {
+    my ($self, $plugin) = @_;
+    return int(defined($plugin->can('evalAdded')));
+}
+
+sub load {
+    my ($self, $db) = @_;
+
+    if (!defined($self->{"jobset"})) {
+        $self->{"jobset"} = $db->resultset('Jobsets')->find({ id => $self->{"jobset_id"}})
+            or die "Jobset $self->{'jobset_id'} does not exist\n";
+    }
+
+    if (!defined($self->{"evaluation"})) {
+        $self->{"evaluation"} = $db->resultset('JobsetEvals')->find({ id => $self->{"evaluation_id"}})
+            or die "Jobset $self->{'jobset_id'} does not exist\n";
+    }
+}
+
+sub execute {
+    my ($self, $db, $plugin) = @_;
+
+    $self->load($db);
+
+    $plugin->evalAdded($self->{"trace_id"}, $self->{"jobset"}, $self->{"evaluation"});
+
+    return 1;
+}
+
+1;
diff --git a/src/lib/Hydra/Plugin.pm b/src/lib/Hydra/Plugin.pm
index ead65b9f..6cd46521 100644
--- a/src/lib/Hydra/Plugin.pm
+++ b/src/lib/Hydra/Plugin.pm
@@ -47,6 +47,11 @@ sub instantiate {
 #     my ($self, $traceID, $jobset) = @_;
 # }
 
+# # Called when $evaluation of $jobset has completed successfully.
+# sub evalAdded {
+#     my ($self, $traceID, $jobset, $evaluation) = @_;
+# }
+
 # # Called when build $build has been queued.
 # sub buildQueued {
 #     my ($self, $build) = @_;
diff --git a/src/script/hydra-eval-jobset b/src/script/hydra-eval-jobset
index 12ccfd5d..a68fe858 100755
--- a/src/script/hydra-eval-jobset
+++ b/src/script/hydra-eval-jobset
@@ -771,7 +771,7 @@ sub checkJobsetWrapped {
         });
 
         $db->storage->dbh->do("notify eval_added, ?", undef,
-                              join('\t', $tmpId, $ev->id));
+                              join("\t", $tmpId, $jobset->get_column('id'), $ev->id));
 
         if ($jobsetChanged) {
             # Create JobsetEvalMembers mappings.
diff --git a/src/script/hydra-notify b/src/script/hydra-notify
index 40f87ffd..3b8ffe6d 100755
--- a/src/script/hydra-notify
+++ b/src/script/hydra-notify
@@ -98,6 +98,7 @@ $listener->subscribe("build_queued");
 $listener->subscribe("build_started");
 $listener->subscribe("cached_build_finished");
 $listener->subscribe("cached_build_queued");
+$listener->subscribe("eval_added");
 $listener->subscribe("eval_cached");
 $listener->subscribe("eval_failed");
 $listener->subscribe("eval_started");
diff --git a/t/Hydra/Event/EvalAdded.t b/t/Hydra/Event/EvalAdded.t
new file mode 100644
index 00000000..140fa462
--- /dev/null
+++ b/t/Hydra/Event/EvalAdded.t
@@ -0,0 +1,112 @@
+use strict;
+use warnings;
+use Setup;
+use Hydra::Event;
+use Hydra::Event::EvalAdded;
+use Test2::V0;
+use Test2::Tools::Exception;
+use Test2::Tools::Mock qw(mock_obj);
+
+
+my $ctx = test_context();
+my $builds = $ctx->makeAndEvaluateJobset(
+    expression => "basic.nix",
+    build => 1
+);
+
+
+subtest "Parsing eval_added" => sub {
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "") },
+        qr/three arguments/,
+        "empty payload"
+    );
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "abc123") },
+        qr/three arguments/,
+        "one argument"
+    );
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "abc123\tabc123") },
+        qr/three arguments/,
+        "two arguments"
+    );
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "abc123\tabc123\tabc123\tabc123") },
+        qr/three arguments/,
+        "four arguments"
+    );
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "abc123\tabc123\t123") },
+        qr/should be an integer/,
+        "not an integer: second position"
+    );
+    like(
+        dies { Hydra::Event::parse_payload("eval_added", "abc123\t123\tabc123") },
+        qr/should be an integer/,
+        "not an integer: third position"
+    );
+    is(
+        Hydra::Event::parse_payload("eval_added", "abc123\t123\t456"),
+        Hydra::Event::EvalAdded->new("abc123", 123, 456)
+    );
+};
+
+subtest "interested" => sub {
+    my $event = Hydra::Event::EvalAdded->new("abc123", 123, 456);
+
+    subtest "A plugin which does not implement the API" => sub {
+        my $plugin = {};
+        my $mock = mock_obj $plugin => ();
+
+        is($event->interestedIn($plugin), 0, "The plugin is not interesting.");
+    };
+
+    subtest "A plugin which does implement the API" => sub {
+        my $plugin = {};
+        my $mock = mock_obj $plugin => (
+            add => [
+                "evalAdded" => sub {}
+            ]
+        );
+
+        is($event->interestedIn($plugin), 1, "The plugin is interesting.");
+    };
+};
+
+subtest "load" => sub {
+    my $jobset = $builds->{"empty_dir"}->jobset;
+    my $evaluation = $builds->{"empty_dir"}->jobsetevals->first();
+
+    my $event = Hydra::Event::EvalAdded->new("traceID", $jobset->id, $evaluation->id);
+
+    $event->load($ctx->db());
+    is($event->{"trace_id"}, "traceID", "The Trace ID matches");
+    is($event->{"jobset_id"}, $jobset->id, "The Jobset ID matches");
+    is($event->{"evaluation_id"}, $evaluation->id, "The Evaluation ID matches");
+
+
+    # Create a fake "plugin" with a evalAdded sub, the sub sets these
+    # "globals"
+    my $passedTraceID;
+    my $passedJobset;
+    my $passedEvaluation;
+    my $plugin = {};
+    my $mock = mock_obj $plugin => (
+        add => [
+            "evalAdded" => sub {
+                my ($self, $traceID, $jobset, $evaluation) = @_;
+                $passedTraceID = $traceID;
+                $passedJobset = $jobset;
+                $passedEvaluation = $evaluation;
+            }
+        ]
+    );
+
+    $event->execute($ctx->db(), $plugin);
+    is($passedTraceID, "traceID", "We get the expected trace ID");
+    is($passedJobset->id, $jobset->id, "The correct jobset is passed");
+    is($passedEvaluation->id, $evaluation->id, "The correct evaluation is passed");
+};
+
+done_testing;
diff --git a/t/scripts/hydra-eval-jobset/notifications.t b/t/scripts/hydra-eval-jobset/notifications.t
index e8c3281f..d2412432 100644
--- a/t/scripts/hydra-eval-jobset/notifications.t
+++ b/t/scripts/hydra-eval-jobset/notifications.t
@@ -67,13 +67,18 @@ subtest "on the initial evaluation" => sub {
     is($listener->block_for_messages(0)->()->{"channel"}, "build_queued", "expect 2/4 builds being queued");
     is($listener->block_for_messages(0)->()->{"channel"}, "build_queued", "expect 3/4 builds being queued");
     is($listener->block_for_messages(0)->()->{"channel"}, "build_queued", "expect 4/4 builds being queued");
-    is($listener->block_for_messages(0)->()->{"channel"}, "eval_added", "the evaluation has completed");
+
+    expectEvent($listener, "eval_added", sub {
+        is($_->{"jobset_id"}, $jobset->get_column('id'), "the jobset ID matches");
+        is($_->{"evaluation_id"}, $evaluation->get_column('id'), "the evaluation ID matches");
+    });
     is($listener->block_for_messages(0)->()->{"channel"}, "builds_added", "new builds have been scheduled");
     is($listener->block_for_messages(0)->(), undef, "there are no more messages from the evaluator");
 };
 
 subtest "on a subsequent, totally cached / unchanged evaluation" => sub {
     ok(evalSucceeds($jobset), "evaluating for the second time");
+    my $evaluation = $builds->{"stable-job-queued"}->jobsetevals->first();
 
     my $traceID;
     expectEvent($listener, "eval_started", sub {
@@ -103,7 +108,9 @@ subtest "on a fresh evaluation with changed sources" => sub {
     $builds->{"stable-job-failing"}->discard_changes();
 
     ok(evalSucceeds($builds->{"variable-job"}->jobset), "evaluating for the third time");
-    is($listener->block_for_messages(0)->()->{"channel"}, "eval_started", "the evaluation started");
+    expectEvent($listener, "eval_started", sub {
+        is($_->{"jobset_id"}, $jobset->get_column('id'), "the jobset ID matches");
+    });
 
     # The order of builds is randomized when writing to the database,
     # so we can't expect the list in any specific order here.