Feat: Add Wikipedia search engine (#478)

* feat: add Wikipedia search engine

* wikipedia

* make format

pyproject.toml

@@ -33,6 +33,7 @@ dependencies = [
     "mcp>=1.6.0",
     "langchain-mcp-adapters>=0.0.9",
     "langchain-deepseek>=0.1.3",
+    "wikipedia>=1.4.0",
 ]
 
 [project.optional-dependencies]

src/config/tools.py

@@ -13,6 +13,7 @@ class SearchEngine(enum.Enum):
     DUCKDUCKGO = "duckduckgo"
     BRAVE_SEARCH = "brave_search"
     ARXIV = "arxiv"
+    WIKIPEDIA = "wikipedia"
 
 
 # Tool configuration

src/tools/search.py

@@ -5,9 +5,17 @@ import logging
 import os
 from typing import List, Optional
 
-from langchain_community.tools import BraveSearch, DuckDuckGoSearchResults
+from langchain_community.tools import (
+    BraveSearch,
+    DuckDuckGoSearchResults,
+    WikipediaQueryRun,
+)
 from langchain_community.tools.arxiv import ArxivQueryRun
-from langchain_community.utilities import ArxivAPIWrapper, BraveSearchWrapper
+from langchain_community.utilities import (
+    ArxivAPIWrapper,
+    BraveSearchWrapper,
+    WikipediaAPIWrapper,
+)
 
 from src.config import SearchEngine, SELECTED_SEARCH_ENGINE
 from src.config import load_yaml_config
@@ -24,6 +32,7 @@ LoggedTavilySearch = create_logged_tool(TavilySearchResultsWithImages)
 LoggedDuckDuckGoSearch = create_logged_tool(DuckDuckGoSearchResults)
 LoggedBraveSearch = create_logged_tool(BraveSearch)
 LoggedArxivSearch = create_logged_tool(ArxivQueryRun)
+LoggedWikipediaSearch = create_logged_tool(WikipediaQueryRun)
 
 
 def get_search_config():
@@ -76,5 +85,19 @@ def get_web_search_tool(max_search_results: int):
                 load_all_available_meta=True,
             ),
         )
+    elif SELECTED_SEARCH_ENGINE == SearchEngine.WIKIPEDIA.value:
+        wiki_lang = search_config.get("wikipedia_lang", "en")
+        wiki_doc_content_chars_max = search_config.get(
+            "wikipedia_doc_content_chars_max", 4000
+        )
+        return LoggedWikipediaSearch(
+            name="web_search",
+            api_wrapper=WikipediaAPIWrapper(
+                lang=wiki_lang,
+                top_k_results=max_search_results,
+                load_all_available_meta=True,
+                doc_content_chars_max=wiki_doc_content_chars_max,
+            ),
+        )
     else:
         raise ValueError(f"Unsupported search engine: {SELECTED_SEARCH_ENGINE}")

uv.lock

@@ -393,6 +393,7 @@ dependencies = [
     { name = "socksio" },
     { name = "sse-starlette" },
     { name = "uvicorn" },
+    { name = "wikipedia" },
     { name = "yfinance" },
 ]
 
@@ -439,6 +440,7 @@ requires-dist = [
     { name = "socksio", specifier = ">=1.0.0" },
     { name = "sse-starlette", specifier = ">=1.6.5" },
     { name = "uvicorn", specifier = ">=0.27.1" },
+    { name = "wikipedia", specifier = ">=1.4.0" },
     { name = "yfinance", specifier = ">=0.2.54" },
 ]
 provides-extras = ["dev", "test"]
@@ -974,10 +976,10 @@ name = "langgraph"
 version = "0.4.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "langchain-core", marker = "python_full_version < '4.0'" },
+    { name = "langchain-core", marker = "python_full_version < '4'" },
     { name = "langgraph-checkpoint" },
-    { name = "langgraph-prebuilt", marker = "python_full_version < '4.0'" },
-    { name = "langgraph-sdk", marker = "python_full_version < '4.0'" },
+    { name = "langgraph-prebuilt", marker = "python_full_version < '4'" },
+    { name = "langgraph-sdk", marker = "python_full_version < '4'" },
     { name = "pydantic" },
     { name = "xxhash" },
 ]
@@ -995,11 +997,11 @@ dependencies = [
     { name = "cryptography" },
     { name = "httpx" },
     { name = "jsonschema-rs" },
-    { name = "langchain-core", marker = "python_full_version < '4.0'" },
-    { name = "langgraph", marker = "python_full_version < '4.0'" },
-    { name = "langgraph-checkpoint", marker = "python_full_version < '4.0'" },
+    { name = "langchain-core", marker = "python_full_version < '4'" },
+    { name = "langgraph", marker = "python_full_version < '4'" },
+    { name = "langgraph-checkpoint", marker = "python_full_version < '4'" },
     { name = "langgraph-runtime-inmem" },
-    { name = "langgraph-sdk", marker = "python_full_version < '4.0'" },
+    { name = "langgraph-sdk", marker = "python_full_version < '4'" },
     { name = "langsmith" },
     { name = "orjson" },
     { name = "pyjwt" },
@@ -1043,8 +1045,8 @@ wheels = [
 
 [package.optional-dependencies]
 inmem = [
-    { name = "langgraph-api", marker = "python_full_version < '4.0'" },
-    { name = "langgraph-runtime-inmem", marker = "python_full_version < '4.0'" },
+    { name = "langgraph-api", marker = "python_full_version < '4'" },
+    { name = "langgraph-runtime-inmem", marker = "python_full_version < '4'" },
     { name = "python-dotenv" },
 ]
 
@@ -1067,8 +1069,8 @@ version = "0.0.11"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "blockbuster" },
-    { name = "langgraph", marker = "python_full_version < '4.0'" },
-    { name = "langgraph-checkpoint", marker = "python_full_version < '4.0'" },
+    { name = "langgraph", marker = "python_full_version < '4'" },
+    { name = "langgraph-checkpoint", marker = "python_full_version < '4'" },
     { name = "sse-starlette" },
     { name = "starlette" },
     { name = "structlog" },
@@ -2235,6 +2237,16 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/f4/24/2a3e3df732393fed8b3ebf2ec078f05546de641fe1b667ee316ec1dcf3b7/webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78", size = 11774, upload-time = "2017-04-05T20:21:32.581Z" },
 ]
 
+[[package]]
+name = "wikipedia"
+version = "1.4.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "beautifulsoup4" },
+    { name = "requests" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/67/35/25e68fbc99e672127cc6fbb14b8ec1ba3dfef035bf1e4c90f78f24a80b7d/wikipedia-1.4.0.tar.gz", hash = "sha256:db0fad1829fdd441b1852306e9856398204dc0786d2996dd2e0c8bb8e26133b2", size = 27748, upload-time = "2014-11-15T15:59:49.808Z" }
+
 [[package]]
 name = "xxhash"
 version = "3.5.0"