diff --git a/agent/webapp.py b/agent/webapp.py
index 74646cef..00acc727 100644
--- a/agent/webapp.py
+++ b/agent/webapp.py
@@ -1192,6 +1192,11 @@ _SUPPORTED_GH_EVENTS = frozenset(
 )
 _SUPPORTED_GH_ISSUE_ACTIONS = frozenset(["edited", "opened", "reopened"])
 _SUPPORTED_GH_PULL_REQUEST_ACTIONS = frozenset(["review_requested"])
+_SUPPORTED_GH_COMMENT_ACTIONS = {
+    "issue_comment": frozenset(["created", "edited"]),
+    "pull_request_review_comment": frozenset(["created", "edited"]),
+    "pull_request_review": frozenset(["submitted", "edited"]),
+}
 
 
 def _build_github_issue_comments_text(comments: list[dict[str, Any]]) -> str:
@@ -1817,10 +1822,23 @@ async def github_webhook(request: Request, background_tasks: BackgroundTasks) ->
         background_tasks.add_task(process_github_issue, payload, event_type)
         return {"status": "accepted", "message": "Processing GitHub issue event"}
 
+    action = payload.get("action", "")
+    supported_comment_actions = _SUPPORTED_GH_COMMENT_ACTIONS.get(event_type)
+    if supported_comment_actions is None:
+        logger.info("Ignoring unsupported GitHub payload shape for event=%s", event_type)
+        return {"status": "ignored", "reason": f"Unsupported payload for event type: {event_type}"}
+    if action and action not in supported_comment_actions:
+        logger.debug("Ignoring unsupported GitHub %s action: %s", event_type, action)
+        return {"status": "ignored", "reason": f"Unsupported GitHub {event_type} action: {action}"}
+
     comment = payload.get("comment") or payload.get("review", {})
     comment_body = (comment.get("body") or "") if comment else ""
     if not any(tag in comment_body.lower() for tag in OPEN_SWE_TAGS):
-        logger.info("Ignoring comment that does not mention @openswe or @open-swe")
+        logger.debug(
+            "Ignoring GitHub %s%s that does not mention @openswe or @open-swe",
+            event_type,
+            f" action={action}" if action else "",
+        )
         return {"status": "ignored", "reason": "Comment does not mention @openswe or @open-swe"}
 
     logger.info("Accepted GitHub webhook: event=%s, scheduling background task", event_type)
diff --git a/tests/test_github_issue_webhook.py b/tests/test_github_issue_webhook.py
index 877d7667..07718061 100644
--- a/tests/test_github_issue_webhook.py
+++ b/tests/test_github_issue_webhook.py
@@ -5,6 +5,7 @@ import hashlib
 import hmac
 import importlib
 import json
+import logging
 
 from fastapi.testclient import TestClient
 
@@ -206,6 +207,7 @@ def test_github_webhook_accepts_issue_comment_events(monkeypatch) -> None:
         client,
         "issue_comment",
         {
+            "action": "created",
             "issue": {"id": 12345, "number": 42, "title": "Fix the flaky test"},
             "comment": {"body": "@openswe please handle this"},
             "repository": {"owner": {"login": "langchain-ai"}, "name": "open-swe"},
@@ -218,6 +220,72 @@ def test_github_webhook_accepts_issue_comment_events(monkeypatch) -> None:
     assert called["event_type"] == "issue_comment"
 
 
+def test_github_webhook_ignores_unmentioned_comment_without_info_log(monkeypatch, caplog) -> None:
+    async def fake_process_github_pr_comment(payload: dict[str, object], event_type: str) -> None:
+        raise AssertionError("process_github_pr_comment should not be called")
+
+    monkeypatch.setattr(webapp, "process_github_pr_comment", fake_process_github_pr_comment)
+    monkeypatch.setattr(webapp, "GITHUB_WEBHOOK_SECRET", _TEST_WEBHOOK_SECRET)
+    caplog.set_level(logging.INFO, logger=webapp.logger.name)
+
+    client = TestClient(webapp.app)
+    response = _post_github_webhook(
+        client,
+        "pull_request_review_comment",
+        {
+            "action": "created",
+            "pull_request": {
+                "number": 1244,
+                "html_url": "https://github.com/langchain-ai/open-swe/pull/1244",
+                "base": {"sha": "base-sha"},
+                "head": {"sha": "head-sha", "ref": "feature-branch"},
+            },
+            "comment": {"body": "Looks good to me"},
+            "repository": {"owner": {"login": "langchain-ai"}, "name": "open-swe"},
+            "sender": {"login": "octocat"},
+        },
+    )
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "status": "ignored",
+        "reason": "Comment does not mention @openswe or @open-swe",
+    }
+    assert "does not mention @openswe or @open-swe" not in caplog.text
+
+
+def test_github_webhook_ignores_unsupported_comment_action(monkeypatch) -> None:
+    async def fake_process_github_pr_comment(payload: dict[str, object], event_type: str) -> None:
+        raise AssertionError("process_github_pr_comment should not be called")
+
+    monkeypatch.setattr(webapp, "process_github_pr_comment", fake_process_github_pr_comment)
+    monkeypatch.setattr(webapp, "GITHUB_WEBHOOK_SECRET", _TEST_WEBHOOK_SECRET)
+
+    client = TestClient(webapp.app)
+    response = _post_github_webhook(
+        client,
+        "pull_request_review",
+        {
+            "action": "dismissed",
+            "review": {"body": "@openswe please check this"},
+            "pull_request": {
+                "number": 1244,
+                "html_url": "https://github.com/langchain-ai/open-swe/pull/1244",
+                "base": {"sha": "base-sha"},
+                "head": {"sha": "head-sha", "ref": "feature-branch"},
+            },
+            "repository": {"owner": {"login": "langchain-ai"}, "name": "open-swe"},
+            "sender": {"login": "octocat"},
+        },
+    )
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "status": "ignored",
+        "reason": "Unsupported GitHub pull_request_review action: dismissed",
+    }
+
+
 def test_github_webhook_blocks_reviewer_repo_not_in_reviewer_repo_allowlist(monkeypatch) -> None:
     called = False