feat: use semantic scholar api key

app/config.py

@@ -3,6 +3,7 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 
 class Settings(BaseSettings):
     google_api_key: str
+    semantic_scholar_api_key: str | None = None
 
     model_config = SettingsConfigDict(env_file=".env")
 

app/tools/literature.py

@@ -3,6 +3,8 @@ from xml.etree import ElementTree
 import httpx
 from tenacity import retry, stop_after_attempt, wait_random_exponential
 
+from app.config import settings
+
 
 @retry(
     stop=stop_after_attempt(10), wait=wait_random_exponential(multiplier=0.5, max=10)
@@ -10,6 +12,11 @@ from tenacity import retry, stop_after_attempt, wait_random_exponential
 def search_semantic_scholar(
     query: str, top_k: int = 20, min_citation_count: int = 5
 ) -> list[dict]:
+    headers = {}
+
+    if api_key := settings.semantic_scholar_api_key:
+        headers["x-api-key"] = api_key
+
     resp = httpx.get(
         "https://api.semanticscholar.org/graph/v1/paper/search",
         params={
@@ -19,6 +26,7 @@ def search_semantic_scholar(
             "fieldsOfStudy": "Medicine,Biology",
             "minCitationCount": min_citation_count,
         },
+        headers=headers,
         timeout=10.0,
     )
     resp.raise_for_status()