feat: add default OpenRouter app attribution headers

nanobot/providers/openai_compat_provider.py

@@ -26,6 +26,11 @@ _ALNUM = string.ascii_letters + string.digits
 
 _STANDARD_TC_KEYS = frozenset({"id", "type", "index", "function"})
 _STANDARD_FN_KEYS = frozenset({"name", "arguments"})
+_DEFAULT_OPENROUTER_HEADERS = {
+    "HTTP-Referer": "https://github.com/HKUDS/nanobot",
+    "X-OpenRouter-Title": "nanobot",
+    "X-OpenRouter-Categories": "cli-agent,personal-agent",
+}
 
 
 def _short_tool_id() -> str:
@@ -89,6 +94,13 @@ def _extract_tc_extras(tc: Any) -> tuple[
     return extra_content, prov, fn_prov
 
 
+def _uses_openrouter_attribution(spec: "ProviderSpec | None", api_base: str | None) -> bool:
+    """Apply Nanobot attribution headers to OpenRouter requests by default."""
+    if spec and spec.name == "openrouter":
+        return True
+    return bool(api_base and "openrouter" in api_base.lower())
+
+
 class OpenAICompatProvider(LLMProvider):
     """Unified provider for all OpenAI-compatible APIs.
 
@@ -113,14 +125,16 @@ class OpenAICompatProvider(LLMProvider):
             self._setup_env(api_key, api_base)
 
         effective_base = api_base or (spec.default_api_base if spec else None) or None
+        default_headers = {"x-session-affinity": uuid.uuid4().hex}
+        if _uses_openrouter_attribution(spec, effective_base):
+            default_headers.update(_DEFAULT_OPENROUTER_HEADERS)
+        if extra_headers:
+            default_headers.update(extra_headers)
 
         self._client = AsyncOpenAI(
             api_key=api_key or "no-key",
             base_url=effective_base,
-            default_headers={
-                "x-session-affinity": uuid.uuid4().hex,
-                **(extra_headers or {}),
-            },
+            default_headers=default_headers,
         )
 
     def _setup_env(self, api_key: str, api_base: str | None) -> None: