diff --git a/.github/changelog/1562-from-description b/.github/changelog/1562-from-description
new file mode 100644
index 000000000..acf5ca947
--- /dev/null
+++ b/.github/changelog/1562-from-description
@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Incoming interactions create an Announce activity so other instances get notified about it.
diff --git a/includes/collection/class-interactions.php b/includes/collection/class-interactions.php
index 545272ccd..10c5c3815 100644
--- a/includes/collection/class-interactions.php
+++ b/includes/collection/class-interactions.php
@@ -330,8 +330,9 @@ public static function activity_to_comment( $activity ) {
 			'comment_date'         => \get_date_from_gmt( \gmdate( 'Y-m-d H:i:s', \strtotime( $date ) ) ),
 			'comment_date_gmt'     => \gmdate( 'Y-m-d H:i:s', \strtotime( $date ) ),
 			'comment_meta'         => array(
-				'source_id' => \esc_url_raw( object_to_uri( $activity['object'] ) ),
-				'protocol'  => 'activitypub',
+				'source_id'             => \esc_url_raw( object_to_uri( $activity['object'] ) ),
+				'protocol'              => 'activitypub',
+				'_activitypub_activity' => $activity,
 			),
 		);
 
diff --git a/includes/scheduler/class-comment.php b/includes/scheduler/class-comment.php
index 09535f335..87d145d0d 100644
--- a/includes/scheduler/class-comment.php
+++ b/includes/scheduler/class-comment.php
@@ -7,6 +7,8 @@
 
 namespace Activitypub\Scheduler;
 
+use Activitypub\Activity\Activity;
+use Activitypub\Collection\Actors;
 use Activitypub\Comment as Comment_Utils;
 
 use function Activitypub\add_to_outbox;
@@ -45,9 +47,12 @@ public static function schedule_comment_activity( $new_status, $old_status, $com
 		}
 
 		$comment = get_comment( $comment );
+		if ( ! $comment ) {
+			return;
+		}
 
-		// Federate only comments that are written by a registered user.
-		if ( ! $comment || ! $comment->user_id ) {
+		if ( ! $comment->user_id ) {
+			self::maybe_announce_interaction( $new_status, $old_status, $comment );
 			return;
 		}
 
@@ -81,6 +86,54 @@ public static function schedule_comment_activity( $new_status, $old_status, $com
 		add_to_outbox( $comment, $type, $comment->user_id );
 	}
 
+	/**
+	 * Announce an interaction.
+	 *
+	 * When a comment is received from another ActivityPub instance and approved,
+	 * this method creates an Announce activity so the blog's followers are notified
+	 * about the interaction.
+	 *
+	 * @param string      $new_status The new comment status.
+	 * @param string      $old_status The old comment status.
+	 * @param \WP_Comment $comment    The comment object.
+	 */
+	public static function maybe_announce_interaction( $new_status, $old_status, $comment ) {
+		// Only if we're in both Blog and User modes.
+		if ( ACTIVITYPUB_ACTOR_AND_BLOG_MODE !== \get_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_MODE ) ) {
+			return;
+		}
+
+		if ( 'approved' !== $new_status || 'approved' === $old_status ) {
+			return;
+		}
+
+		if ( ! Comment_Utils::was_received( $comment ) ) {
+			return;
+		}
+
+		// Get activity from comment meta.
+		$activity = \get_comment_meta( $comment->comment_ID, '_activitypub_activity', true );
+
+		// Validate activity structure.
+		if ( ! $activity || ! \is_array( $activity ) ) {
+			return;
+		}
+
+		// Ensure object exists in the activity.
+		if ( empty( $activity['object'] ) || ! \is_array( $activity['object'] ) ) {
+			return;
+		}
+
+		// Create the Announce activity.
+		$announce = new Activity();
+		$announce->set_type( 'Announce' );
+		$announce->set_actor( Actors::BLOG_USER_ID );
+		$announce->set_object( $activity );
+
+		// Add to outbox with error handling.
+		add_to_outbox( $announce, null, Actors::BLOG_USER_ID, ACTIVITYPUB_CONTENT_VISIBILITY_PUBLIC );
+	}
+
 	/**
 	 * Schedule Comment Activities on insert.
 	 *
diff --git a/package-lock.json b/package-lock.json
index 50e2b659a..1fb208cb3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -122,6 +122,7 @@
 			"integrity": "sha512-yJ474Zv3cwiSOO9nXJuqzvwEeM+chDuQ8GJirw+pZ91sCGCyOZ3dJkVE09fTV0VEVzXyLWhh3G/AolYTPX7Mow==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@ampproject/remapping": "^2.2.0",
 				"@babel/code-frame": "^7.25.7",
@@ -2098,6 +2099,7 @@
 			"integrity": "sha512-h0Un1ieD+HUrzBH6dJXhod3ifSghk5Hw/2Y4/KHBziPlZecrFyE9YOTPU6eOs0V9pYl8gOs86fkr/KN8lUX39A==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@keyv/serialize": "^1.1.1"
 			}
@@ -2138,6 +2140,7 @@
 				}
 			],
 			"license": "MIT",
+			"peer": true,
 			"engines": {
 				"node": ">=18"
 			},
@@ -2161,6 +2164,7 @@
 				}
 			],
 			"license": "MIT",
+			"peer": true,
 			"engines": {
 				"node": ">=18"
 			}
@@ -2295,6 +2299,7 @@
 			"integrity": "sha512-O000MLDBDdk/EohJPFUqvnp4qnHeYkVP5B0xEG0D/L7cOKP9kefu2DXn8dj74cQfsEzUqh+sr1RzFqiL1o+PpA==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@babel/runtime": "^7.18.3",
 				"@emotion/babel-plugin": "^11.13.5",
@@ -4050,6 +4055,7 @@
 			"integrity": "sha512-3giAOQvZiH5F9bMlMiv8+GSPMeqg0dbaeo58/0SlA9sxSqZhnUtxzX9/2FzyhS9sWQf5S0GJE0AKBrFqjpeYcg==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"engines": {
 				"node": ">=8.0.0"
 			}
@@ -4073,6 +4079,7 @@
 			"integrity": "sha512-s5vvxXPVdjqS3kTLKMeBMvop9hbWkwzBpu+mUO2M7sZtlkyDJGwFe33wRKnbaYDo8ExRVBIIdwIGrqpxHuKttA==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"engines": {
 				"node": ">=14"
 			},
@@ -4086,6 +4093,7 @@
 			"integrity": "sha512-OOCM2C/QIURhJMuKaekP3TRBxBKxG/TWWA0TL2J6nXUtDnuCtccy49LUJF8xPFXMX+0LMcxFpCo8M9cGY1W6rQ==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"dependencies": {
 				"@opentelemetry/semantic-conventions": "1.28.0"
 			},
@@ -4568,6 +4576,7 @@
 			"integrity": "sha512-5UxZqiAgLYGFjS4s9qm5mBVo433u+dSPUFWVWXmLAD4wB65oMCoXaJP1KJa9DIYYMeHu3z4BZcStG3LC593cWA==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"dependencies": {
 				"@opentelemetry/core": "1.30.1",
 				"@opentelemetry/semantic-conventions": "1.28.0"
@@ -4595,6 +4604,7 @@
 			"integrity": "sha512-jVPgBbH1gCy2Lb7X0AVQ8XAfgg0pJ4nvl8/IiQA6nxOsPvS+0zMJaFSs2ltXe0J6C8dqjcnpyqINDJmU30+uOg==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"dependencies": {
 				"@opentelemetry/core": "1.30.1",
 				"@opentelemetry/resources": "1.30.1",
@@ -4623,6 +4633,7 @@
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 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"engines": {
 				"node": ">=14"
 			}
@@ -4994,6 +5005,7 @@
 			"integrity": "sha512-vSMYtL/zOcFpvJCW71Q/OEGQb7KYBPAdKh35WNSkaZA75JlAO8ED8UN6GUNTm3drWomcbcqRPFqQbLae8yBTdg==",
 			"dev": true,
 			"license": "Apache-2.0",
+			"peer": true,
 			"dependencies": {
 				"playwright": "1.56.1"
 			},
@@ -5941,6 +5953,7 @@
 			"integrity": "sha512-8QqtOQT5ACVlmsvKOJNEaWmRPmcojMOzCz4Hs2BGG/toAp/K38LcsMRyLp349glq5AzJbCEeimEoxaX6v/fLrA==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@babel/core": "^7.21.3",
 				"@svgr/babel-preset": "8.1.0",
@@ -6193,8 +6206,7 @@
 			"resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
 			"integrity": "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw==",
 			"dev": true,
-			"license": "MIT",
-			"peer": true
+			"license": "MIT"
 		},
 		"node_modules/@types/babel__core": {
 			"version": "7.20.5",
@@ -6302,6 +6314,7 @@
 			"integrity": "sha512-FXx2pKgId/WyYo2jXw63kk7/+TY7u7AziEJxJAnSFzHlqTAS3Ync6SvgYAN/k4/PQpnnVuzoMuVnByKK2qp0ag==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@types/estree": "*",
 				"@types/json-schema": "*"
@@ -6648,6 +6661,7 @@
 			"integrity": "sha512-RFA/bURkcKzx/X9oumPG9Vp3D3JUgus/d0b67KB0t5S/raciymilkOa66olh78MUI92QLbEJevO7rvqU/kjwKA==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@types/prop-types": "*",
 				"csstype": "^3.0.2"
@@ -6659,6 +6673,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"peerDependencies": {
 				"@types/react": "^18.0.0"
 			}
@@ -6874,6 +6889,7 @@
 			"integrity": "sha512-tbsV1jPne5CkFQCgPBcDOt30ItF7aJoZL997JSF7MhGQqOeT3svWRYxiqlfA5RUdlHN6Fi+EI9bxqbdyAUZjYQ==",
 			"dev": true,
 			"license": "BSD-2-Clause",
+			"peer": true,
 			"dependencies": {
 				"@typescript-eslint/scope-manager": "6.21.0",
 				"@typescript-eslint/types": "6.21.0",
@@ -8269,6 +8285,7 @@
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 			"dev": true,
 			"license": "GPL-2.0-or-later",
+			"peer": true,
 			"dependencies": {
 				"@inquirer/prompts": "^7.2.0",
 				"chalk": "^4.0.0",
@@ -9309,6 +9326,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"bin": {
 				"acorn": "bin/acorn"
 			},
@@ -9402,6 +9420,7 @@
 			"integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"fast-deep-equal": "^3.1.1",
 				"fast-json-stable-stringify": "^2.0.0",
@@ -9619,7 +9638,6 @@
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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"dependencies": {
 				"dequal": "^2.0.3"
 			}
@@ -10464,6 +10482,7 @@
 				}
 			],
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"baseline-browser-mapping": "^2.8.9",
 				"caniuse-lite": "^1.0.30001746",
@@ -12261,7 +12280,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=6"
 			}
@@ -12320,7 +12338,8 @@
 			"resolved": "https://registry.npmjs.org/devtools-protocol/-/devtools-protocol-0.0.1507524.tgz",
 			"integrity": "sha512-OjaNE7qpk6GRTXtqQjAE5bGx6+c4F1zZH0YXtpZQLM92HNXx4zMAaqlKhP4T52DosG6hDW8gPMNhGOF8xbwk/w==",
 			"dev": true,
-			"license": "BSD-3-Clause"
+			"license": "BSD-3-Clause",
+			"peer": true
 		},
 		"node_modules/diff": {
 			"version": "4.0.2",
@@ -12399,8 +12418,7 @@
 			"resolved": "https://registry.npmjs.org/dom-accessibility-api/-/dom-accessibility-api-0.5.16.tgz",
 			"integrity": "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg==",
 			"dev": true,
-			"license": "MIT",
-			"peer": true
+			"license": "MIT"
 		},
 		"node_modules/dom-serializer": {
 			"version": "2.0.0",
@@ -12983,6 +13001,7 @@
 			"deprecated": "This version is no longer supported. Please see https://eslint.org/version-support for other options.",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@eslint-community/eslint-utils": "^4.2.0",
 				"@eslint-community/regexpp": "^4.6.1",
@@ -13039,6 +13058,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"bin": {
 				"eslint-config-prettier": "bin/cli.js"
 			},
@@ -16732,6 +16752,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@jest/core": "^29.7.0",
 				"@jest/types": "^29.6.3",
@@ -18432,7 +18453,8 @@
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 			"dev": true,
-			"license": "BSD-3-Clause"
+			"license": "BSD-3-Clause",
+			"peer": true
 		},
 		"node_modules/lighthouse/node_modules/puppeteer-core/node_modules/ws": {
 			"version": "8.18.3",
@@ -18722,7 +18744,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"lz-string": "bin/bin.js"
 			}
@@ -19616,6 +19637,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"ajv": "^6.12.6",
 				"ajv-errors": "^1.0.1",
@@ -20771,6 +20793,7 @@
 				}
 			],
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"nanoid": "^3.3.11",
 				"picocolors": "^1.1.1",
@@ -21547,6 +21570,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"funding": {
 				"type": "opencollective",
 				"url": "https://opencollective.com/preact"
@@ -21569,6 +21593,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"bin": {
 				"prettier": "bin/prettier.cjs"
 			},
@@ -21598,7 +21623,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"ansi-regex": "^5.0.1",
 				"ansi-styles": "^5.0.0",
@@ -21614,7 +21638,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=10"
 			},
@@ -21627,8 +21650,7 @@
 			"resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
 			"integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
 			"dev": true,
-			"license": "MIT",
-			"peer": true
+			"license": "MIT"
 		},
 		"node_modules/process-nextick-args": {
 			"version": "2.0.1",
@@ -21991,6 +22013,7 @@
 			"integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"loose-envify": "^1.1.0"
 			},
@@ -22064,6 +22087,7 @@
 			"integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"loose-envify": "^1.1.0",
 				"scheduler": "^0.23.2"
@@ -22100,6 +22124,7 @@
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 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"engines": {
 				"node": ">=0.10.0"
 			}
@@ -22339,7 +22364,8 @@
 			"resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
 			"integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w==",
 			"dev": true,
-			"license": "MIT"
+			"license": "MIT",
+			"peer": true
 		},
 		"node_modules/reflect.getprototypeof": {
 			"version": "1.0.10",
@@ -22922,6 +22948,7 @@
 			"integrity": "sha512-t+YPtOQHpGW1QWsh1CHQ5cPIr9lbbGZLZnbihP/D/qZj/yuV68m8qarcV17nvkOX81BCrvzAlq2klCQFZghyTg==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"chokidar": "^4.0.0",
 				"immutable": "^5.0.2",
@@ -23027,6 +23054,7 @@
 			"integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"fast-deep-equal": "^3.1.3",
 				"fast-uri": "^3.0.1",
@@ -24563,6 +24591,7 @@
 				}
 			],
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@csstools/css-parser-algorithms": "^3.0.5",
 				"@csstools/css-tokenizer": "^3.0.4",
@@ -24898,6 +24927,7 @@
 			"integrity": "sha512-8sLjZwK0R+JlxlYcTuVnyT2v+htpdrjDOKuMcOVdYjt52Lh8hWRYpxBPoKx/Zg+bcjc3wx6fmQevMmUztS/ccA==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"cssesc": "^3.0.0",
 				"util-deprecate": "^1.0.2"
@@ -25673,6 +25703,7 @@
 			"integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
 			"dev": true,
 			"license": "(MIT OR CC0-1.0)",
+			"peer": true,
 			"engines": {
 				"node": ">=10"
 			},
@@ -26320,6 +26351,7 @@
 			"integrity": "sha512-7h/weGm9d/ywQ6qzJ+Xy+r9n/3qgp/thalBbpOi5i223dPXKi04IBtqPN9nTd+jBc7QKfvDbaBnFipYp4sJAUQ==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@types/eslint-scope": "^3.7.7",
 				"@types/estree": "^1.0.8",
@@ -26428,6 +26460,7 @@
 			"integrity": "sha512-pIDJHIEI9LR0yxHXQ+Qh95k2EvXpWzZ5l+d+jIo+RdSm9MiHfzazIxwwni/p7+x4eJZuvG1AJwgC4TNQ7NRgsg==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@discoveryjs/json-ext": "^0.5.0",
 				"@webpack-cli/configtest": "^2.1.1",
@@ -26508,6 +26541,7 @@
 			"integrity": "sha512-0XavAZbNJ5sDrCbkpWL8mia0o5WPOd2YGtxrEiZkBK9FjLppIUK2TgxK6qGD2P3hUXTJNNPVibrerKcx5WkR1g==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"@types/bonjour": "^3.5.9",
 				"@types/connect-history-api-fallback": "^1.3.5",
@@ -27194,6 +27228,7 @@
 			"integrity": "sha512-OIDwaflOaq4wC6YlPBy2L6ceKeKuF7DeTxx+jPzv1FHn9tCZ0ZwSRnUBxD05E3yed46fv/FWJbvR+Ud7x0L7zw==",
 			"dev": true,
 			"license": "MIT",
+			"peer": true,
 			"dependencies": {
 				"lib0": "^0.2.99"
 			},
diff --git a/tests/phpunit/tests/includes/scheduler/class-test-comment.php b/tests/phpunit/tests/includes/scheduler/class-test-comment.php
index 2a204031f..2d70e9d9a 100644
--- a/tests/phpunit/tests/includes/scheduler/class-test-comment.php
+++ b/tests/phpunit/tests/includes/scheduler/class-test-comment.php
@@ -225,4 +225,251 @@ public function test_no_delete_activity_for_non_federated_comment() {
 
 		$this->assertEmpty( $outbox_posts, 'Should not create Delete activity for non-federated comment deletion' );
 	}
+
+	/**
+	 * Test that no announce is created when not in Blog and User mode.
+	 *
+	 * @covers ::maybe_announce_interaction
+	 */
+	public function test_no_announce_when_not_in_blog_and_user_mode() {
+		$post_id = self::factory()->post->create( array( 'post_author' => self::$user_id ) );
+
+		// Set actor mode to User only mode.
+		\update_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_MODE );
+
+		$activity = array(
+			'type'   => 'Create',
+			'actor'  => 'https://example.com/users/testuser',
+			'object' => array(
+				'type'    => 'Note',
+				'content' => 'Test comment content',
+			),
+		);
+
+		$comment_id = self::factory()->comment->create(
+			array(
+				'comment_post_ID'  => $post_id,
+				'comment_approved' => 0,
+				'comment_meta'     => array(
+					'protocol'              => 'activitypub',
+					'_activitypub_activity' => $activity,
+				),
+			)
+		);
+
+		// Get count of Announce activities before approval.
+		$before_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		\wp_set_comment_status( $comment_id, 'approve' );
+
+		// Get count after approval.
+		$after_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		$this->assertEquals( $before_count, $after_count, 'Should not create Announce when not in Blog and User mode' );
+
+		\wp_delete_comment( $comment_id, true );
+	}
+
+	/**
+	 * Test that no announce is created for non-received comments.
+	 *
+	 * @covers ::maybe_announce_interaction
+	 */
+	public function test_no_announce_for_non_received_comments() {
+		$post_id = self::factory()->post->create( array( 'post_author' => self::$user_id ) );
+
+		\update_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_AND_BLOG_MODE );
+
+		// Create a comment WITHOUT ActivityPub protocol meta (not received).
+		$comment_id = self::factory()->comment->create(
+			array(
+				'comment_post_ID'  => $post_id,
+				'comment_approved' => 0,
+			)
+		);
+
+		$before_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		\wp_set_comment_status( $comment_id, 'approve' );
+
+		$after_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		$this->assertEquals( $before_count, $after_count, 'Should not create Announce for non-received comments' );
+
+		\wp_delete_comment( $comment_id, true );
+	}
+
+	/**
+	 * Test that no announce is created when activity data is missing.
+	 *
+	 * @covers ::maybe_announce_interaction
+	 */
+	public function test_no_announce_when_activity_data_missing() {
+		$post_id = self::factory()->post->create( array( 'post_author' => self::$user_id ) );
+
+		\update_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_AND_BLOG_MODE );
+
+		// Create a comment with protocol meta but no activity data.
+		$comment_id = self::factory()->comment->create(
+			array(
+				'comment_post_ID'  => $post_id,
+				'comment_approved' => 0,
+				'comment_meta'     => array(
+					'protocol' => 'activitypub',
+				),
+			)
+		);
+
+		$before_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		\wp_set_comment_status( $comment_id, 'approve' );
+
+		$after_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		$this->assertEquals( $before_count, $after_count, 'Should not create Announce when activity data is missing' );
+
+		\wp_delete_comment( $comment_id, true );
+	}
+
+	/**
+	 * Test that no announce is created when activity is malformed.
+	 *
+	 * @covers ::maybe_announce_interaction
+	 */
+	public function test_no_announce_when_activity_malformed() {
+		$post_id = self::factory()->post->create( array( 'post_author' => self::$user_id ) );
+
+		\update_option( 'activitypub_actor_mode', ACTIVITYPUB_ACTOR_AND_BLOG_MODE );
+
+		// Create a comment with malformed activity (missing 'object' field).
+		$malformed_activity = array(
+			'type'  => 'Create',
+			'actor' => 'https://example.com/users/testuser',
+		);
+
+		$comment_id = self::factory()->comment->create(
+			array(
+				'comment_post_ID'  => $post_id,
+				'comment_approved' => 0,
+				'comment_meta'     => array(
+					'protocol'              => 'activitypub',
+					'_activitypub_activity' => $malformed_activity,
+				),
+			)
+		);
+
+		$before_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		\wp_set_comment_status( $comment_id, 'approve' );
+
+		$after_count = \count(
+			\get_posts(
+				array(
+					'post_type'   => Outbox::POST_TYPE,
+					'numberposts' => -1,
+					'meta_query'  => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
+						array(
+							'key'   => '_activitypub_activity_type',
+							'value' => 'Announce',
+						),
+					),
+				)
+			)
+		);
+
+		$this->assertEquals( $before_count, $after_count, 'Should not create Announce when activity is malformed' );
+
+		\wp_delete_comment( $comment_id, true );
+	}
 }