feat: replace search_web with unified lookup tool (Wikipedia + SearXNG fallback)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/fabledassistant/services/tools/web.py

@@ -1,4 +1,4 @@
-"""Web search, research, and image tools (require SearXNG)."""
+"""Web search, research, and image tools."""
 
 from __future__ import annotations
 
@@ -10,29 +10,70 @@ logger = logging.getLogger(__name__)
 
 
 @tool(
-    name="search_web",
+    name="lookup",
     description=(
-        "Quick web lookup — returns search result snippets for factual questions, current events, "
-        "definitions, or version numbers. No note is saved. Use research_topic when the user wants "
-        "a comprehensive written report saved as a note."
+        "Look up a topic, concept, or factual question. Returns a concise answer from "
+        "Wikipedia or web sources. Use for definitions, explanations, 'what is X', "
+        "'how does Y work', current events, or version numbers. No note is saved. "
+        "For comprehensive written reports saved as notes, use research_topic instead."
     ),
     parameters={
-        "query": {"type": "string", "description": "The search query"},
+        "query": {"type": "string", "description": "The topic or question to look up"},
     },
     required=["query"],
-    requires="searxng",
 )
-async def search_web_tool(*, user_id, arguments, **_ctx):
-    from fabledassistant.services.research import _search_searxng
+async def lookup_tool(*, user_id, arguments, **_ctx):
+    from fabledassistant.config import Config
+    from fabledassistant.services.wikipedia import wiki_summary
 
     query = arguments.get("query", "")
-    results = await _search_searxng(query)
-    if not results:
-        return {"success": False, "error": f"No results found for '{query}'"}
+
+    # 1. Try Wikipedia first
+    wiki = await wiki_summary(query)
+    if wiki:
+        return {
+            "success": True,
+            "type": "lookup",
+            "source": "wikipedia",
+            "data": wiki,
+        }
+
+    # 2. Fall back to SearXNG + article fetch
+    if Config.searxng_enabled():
+        from fabledassistant.services.research import _search_searxng
+        from fabledassistant.services.rss import _fetch_full_article
+
+        results = await _search_searxng(query)
+        if results:
+            articles: list[dict] = []
+            for r in results[:2]:
+                url = r.get("url", "")
+                if not url:
+                    continue
+                content = await _fetch_full_article(url)
+                articles.append({
+                    "url": url,
+                    "title": r.get("title", url),
+                    "snippet": r.get("snippet", ""),
+                    "content": (content or "")[:4000],
+                })
+            if articles:
+                return {
+                    "success": True,
+                    "type": "lookup",
+                    "source": "web",
+                    "data": {"query": query, "results": articles},
+                }
+
+    # 3. No sources available
     return {
         "success": True,
-        "type": "web_search",
-        "data": {"query": query, "results": results, "count": len(results)},
+        "type": "lookup",
+        "source": "none",
+        "data": {
+            "query": query,
+            "message": "No results found. You can answer from your own knowledge.",
+        },
     }
 
 
@@ -42,7 +83,7 @@ async def search_web_tool(*, user_id, arguments, **_ctx):
         "Deep web research — searches multiple sources, synthesizes findings, and saves the result "
         "as a structured note with sections and citations. Use when the user says 'research', "
         "'look into', or wants a comprehensive write-up. Takes 30–120 seconds. "
-        "For a quick factual answer without saving a note, use search_web."
+        "For a quick factual answer without saving a note, use lookup."
     ),
     parameters={
         "topic": {"type": "string", "description": "The topic or question to research"},
@@ -64,7 +105,7 @@ async def research_topic_tool(*, user_id, arguments, **_ctx):
 
 @tool(
     name="search_images",
-    description="Search and display images inline. Use ONLY when the user explicitly asks to see, show, or find an image or photo. Not for factual questions — use search_web for those.",
+    description="Search and display images inline. Use ONLY when the user explicitly asks to see, show, or find an image or photo. Not for factual questions — use lookup for those.",
     parameters={
         "query": {"type": "string", "description": "The image search query"},
     },