diff --git a/agent/auxiliary_client.py b/agent/auxiliary_client.py
index 3546e6bdb8..b8229bb5e2 100644
--- a/agent/auxiliary_client.py
+++ b/agent/auxiliary_client.py
@@ -28,6 +28,13 @@ from hermes_constants import OPENROUTER_BASE_URL
 
 logger = logging.getLogger(__name__)
 
+# OpenRouter app attribution headers
+_OR_HEADERS = {
+    "HTTP-Referer": "https://github.com/NousResearch/hermes-agent",
+    "X-OpenRouter-Title": "Hermes Agent",
+    "X-OpenRouter-Categories": "cli-agent",
+}
+
 # Default auxiliary models per provider
 _OPENROUTER_MODEL = "google/gemini-3-flash-preview"
 _NOUS_MODEL = "gemini-3-flash"
@@ -78,7 +85,8 @@ def get_text_auxiliary_client() -> Tuple[Optional[OpenAI], Optional[str]]:
     or_key = os.getenv("OPENROUTER_API_KEY")
     if or_key:
         logger.debug("Auxiliary text client: OpenRouter")
-        return OpenAI(api_key=or_key, base_url=OPENROUTER_BASE_URL), _OPENROUTER_MODEL
+        return OpenAI(api_key=or_key, base_url=OPENROUTER_BASE_URL,
+                       default_headers=_OR_HEADERS), _OPENROUTER_MODEL
 
     # 2. Nous Portal
     nous = _read_nous_auth()
@@ -112,7 +120,8 @@ def get_vision_auxiliary_client() -> Tuple[Optional[OpenAI], Optional[str]]:
     or_key = os.getenv("OPENROUTER_API_KEY")
     if or_key:
         logger.debug("Auxiliary vision client: OpenRouter")
-        return OpenAI(api_key=or_key, base_url=OPENROUTER_BASE_URL), _OPENROUTER_MODEL
+        return OpenAI(api_key=or_key, base_url=OPENROUTER_BASE_URL,
+                       default_headers=_OR_HEADERS), _OPENROUTER_MODEL
 
     # 2. Nous Portal
     nous = _read_nous_auth()
diff --git a/run_agent.py b/run_agent.py
index 0c73e44d56..b96879c8b1 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -270,6 +270,15 @@ class AIAgent:
             # Primary: OPENROUTER_API_KEY, fallback to direct provider keys
             client_kwargs["api_key"] = os.getenv("OPENROUTER_API_KEY", "")
         
+        # OpenRouter app attribution — shows hermes-agent in rankings/analytics
+        effective_base = client_kwargs.get("base_url", "")
+        if "openrouter" in effective_base.lower():
+            client_kwargs["default_headers"] = {
+                "HTTP-Referer": "https://github.com/NousResearch/hermes-agent",
+                "X-OpenRouter-Title": "Hermes Agent",
+                "X-OpenRouter-Categories": "cli-agent",
+            }
+        
         self._client_kwargs = client_kwargs  # stored for rebuilding after interrupt
         try:
             self.client = OpenAI(**client_kwargs)
diff --git a/tools/session_search_tool.py b/tools/session_search_tool.py
index 369a5901b7..179d485c09 100644
--- a/tools/session_search_tool.py
+++ b/tools/session_search_tool.py
@@ -31,10 +31,17 @@ from agent.auxiliary_client import get_text_auxiliary_client
 _aux_client, _SUMMARIZER_MODEL = get_text_auxiliary_client()
 _async_aux_client: AsyncOpenAI | None = None
 if _aux_client is not None:
-    _async_aux_client = AsyncOpenAI(
-        api_key=_aux_client.api_key,
-        base_url=str(_aux_client.base_url),
-    )
+    _async_kwargs = {
+        "api_key": _aux_client.api_key,
+        "base_url": str(_aux_client.base_url),
+    }
+    if "openrouter" in str(_aux_client.base_url).lower():
+        _async_kwargs["default_headers"] = {
+            "HTTP-Referer": "https://github.com/NousResearch/hermes-agent",
+            "X-OpenRouter-Title": "Hermes Agent",
+            "X-OpenRouter-Categories": "cli-agent",
+        }
+    _async_aux_client = AsyncOpenAI(**_async_kwargs)
 MAX_SESSION_CHARS = 100_000
 MAX_SUMMARY_TOKENS = 2000
 
diff --git a/tools/vision_tools.py b/tools/vision_tools.py
index 38d168f08d..4b88724ab3 100644
--- a/tools/vision_tools.py
+++ b/tools/vision_tools.py
@@ -46,10 +46,17 @@ logger = logging.getLogger(__name__)
 _aux_sync_client, DEFAULT_VISION_MODEL = get_vision_auxiliary_client()
 _aux_async_client: AsyncOpenAI | None = None
 if _aux_sync_client is not None:
-    _aux_async_client = AsyncOpenAI(
-        api_key=_aux_sync_client.api_key,
-        base_url=str(_aux_sync_client.base_url),
-    )
+    _async_kwargs = {
+        "api_key": _aux_sync_client.api_key,
+        "base_url": str(_aux_sync_client.base_url),
+    }
+    if "openrouter" in str(_aux_sync_client.base_url).lower():
+        _async_kwargs["default_headers"] = {
+            "HTTP-Referer": "https://github.com/NousResearch/hermes-agent",
+            "X-OpenRouter-Title": "Hermes Agent",
+            "X-OpenRouter-Categories": "cli-agent",
+        }
+    _aux_async_client = AsyncOpenAI(**_async_kwargs)
 
 _debug = DebugSession("vision_tools", env_var="VISION_TOOLS_DEBUG")
 
diff --git a/tools/web_tools.py b/tools/web_tools.py
index 43a7da55a0..8610e38c6f 100644
--- a/tools/web_tools.py
+++ b/tools/web_tools.py
@@ -71,10 +71,17 @@ DEFAULT_MIN_LENGTH_FOR_SUMMARIZATION = 5000
 _aux_sync_client, DEFAULT_SUMMARIZER_MODEL = get_text_auxiliary_client()
 _aux_async_client: AsyncOpenAI | None = None
 if _aux_sync_client is not None:
-    _aux_async_client = AsyncOpenAI(
-        api_key=_aux_sync_client.api_key,
-        base_url=str(_aux_sync_client.base_url),
-    )
+    _async_kwargs = {
+        "api_key": _aux_sync_client.api_key,
+        "base_url": str(_aux_sync_client.base_url),
+    }
+    if "openrouter" in str(_aux_sync_client.base_url).lower():
+        _async_kwargs["default_headers"] = {
+            "HTTP-Referer": "https://github.com/NousResearch/hermes-agent",
+            "X-OpenRouter-Title": "Hermes Agent",
+            "X-OpenRouter-Categories": "cli-agent",
+        }
+    _aux_async_client = AsyncOpenAI(**_async_kwargs)
 
 _debug = DebugSession("web_tools", env_var="WEB_TOOLS_DEBUG")