diff --git a/src/vantage/tools/__init__.py b/src/vantage/tools/__init__.py
index 25da4b7..82192ae 100644
--- a/src/vantage/tools/__init__.py
+++ b/src/vantage/tools/__init__.py
@@ -1,6 +1,7 @@
 from .calculator import Calculator
 from .weather_tool import WeatherTool
 from .stack_overflow_tool import StackOverflowTool
+from .wikipedia_tool import WikipediaTool
 
-__all__ = ["Calculator", "WeatherTool", "StackOverflowTool"]
+__all__ = ["Calculator", "WeatherTool", "StackOverflowTool", "WikipediaTool"]
 
diff --git a/src/vantage/tools/wikipedia_tool.py b/src/vantage/tools/wikipedia_tool.py
new file mode 100644
index 0000000..1c0eaa2
--- /dev/null
+++ b/src/vantage/tools/wikipedia_tool.py
@@ -0,0 +1,82 @@
+from __future__ import annotations
+
+import re
+from typing import Any, Dict
+from urllib.parse import urlencode
+
+import httpx
+
+from ..core.bases import ToolBase
+
+_DEFAULT_TIMEOUT = 10.0
+_RESPONSE_SNIPPET_LENGTH = 200
+
+
+class WikipediaTool(ToolBase):
+    def __init__(self, timeout: float = _DEFAULT_TIMEOUT) -> None:
+        if timeout <= 0:
+            raise ValueError("timeout must be positive")
+        self._timeout = timeout
+
+    @property
+    def name(self) -> str:
+        return "wikipedia_search"
+
+    @property
+    def description(self) -> str:
+        return "Search Wikipedia for a given query and return a brief summary of top results."
+
+    def input_schema(self) -> Dict[str, Any]:
+        return {
+            "type": "object",
+            "properties": {
+                "query": {
+                    "type": "string",
+                    "description": "The search query, e.g. 'Albert Einstein'",
+                },
+            },
+            "required": ["query"],
+            "additionalProperties": False,
+        }
+
+    def execute(self, **kwargs: Any) -> str:
+        query = str(kwargs.get("query", ""))
+        if not query.strip():
+            raise ValueError("query is required")
+            
+        params = {
+            "action": "query",
+            "list": "search",
+            "srsearch": query,
+            "utf8": "",
+            "format": "json"
+        }
+        url = f"https://en.wikipedia.org/w/api.php?{urlencode(params)}"
+        try:
+            response = httpx.get(url, timeout=self._timeout)
+            response.raise_for_status()
+            data = response.json()
+            search_results = data.get("query", {}).get("search", [])
+            if not search_results:
+                return "No results found."
+            
+            output = []
+            for item in search_results[:3]: # return top 3
+                title = item.get("title", "")
+                snippet = item.get("snippet", "")
+                # Clean up simple HTML tags from the snippet
+                snippet = re.sub(r'<[^>]+>', '', snippet)
+                output.append(f"Title: {title}\nSummary: {snippet}")
+                
+            return "\n\n".join(output)
+        except httpx.HTTPStatusError as exc:
+            body = exc.response.text
+            snippet = body[:_RESPONSE_SNIPPET_LENGTH] + ("..." if len(body) > _RESPONSE_SNIPPET_LENGTH else "")
+            message = f"Failed to fetch Wikipedia data for query '{query}' (status {exc.response.status_code})."
+            if snippet:
+                message += f" Response snippet: {snippet}"
+            raise RuntimeError(message) from exc
+        except httpx.RequestError as exc:
+            raise RuntimeError(f"Failed to fetch Wikipedia data for query '{query}': {exc}") from exc
+        except ValueError as exc:
+             raise RuntimeError(f"Failed to parse Wikipedia response for query '{query}': {exc}") from exc