diff --git a/tools/content/library_api.py b/tools/content/library_api.py
index 6b022b2..148231d 100644
--- a/tools/content/library_api.py
+++ b/tools/content/library_api.py
@@ -8,6 +8,7 @@ from envfile import env_value
 DEFAULT_API_URL = "http://localhost:5000"
 IMAGE_PATH_PREFIX = "/api/library/images/"
 REQUEST_TIMEOUT_SECONDS = 60
+USER_AGENT = "sirblob-content-tool/1.0"
 
 
 class LibraryError(ValueError):
@@ -49,7 +50,7 @@ def error_message(error: urllib.error.HTTPError) -> str:
 
 def send(method: str, path: str, body: dict | None = None, signed: bool = True, site: Site | None = None):
     site = site or local_site()
-    headers = {"Accept": "application/json"}
+    headers = {"Accept": "application/json", "User-Agent": USER_AGENT}
     data = None
     if signed:
         headers["Authorization"] = f"Bearer {site.require_key()}"