feat: add Gemini 2.5 Flash enrichment to web_search results

Fetch full page content per result, then call Gemini 2.5 Flash
(via OCI GenAI) to extract: abstract, date, author, tags,
content_type, and uuid. Enrichment runs in parallel (ThreadPoolExecutor).
enrich=False flag available to skip for raw/fast results.

src/enricher.py

@@ -0,0 +1,164 @@
+"""Page fetching and LLM-based enrichment via Gemini 2.5 Pro on OCI GenAI."""
+
+import json
+import os
+import re
+import uuid
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from html.parser import HTMLParser
+
+import httpx
+import oci
+from oci.generative_ai_inference import GenerativeAiInferenceClient
+from oci.generative_ai_inference.models import (
+    ChatDetails,
+    GenericChatRequest,
+    OnDemandServingMode,
+    TextContent,
+    UserMessage,
+)
+
+# ---------------------------------------------------------------------------
+# HTML stripping
+# ---------------------------------------------------------------------------
+
+class _TextExtractor(HTMLParser):
+    _SKIP_TAGS = {"script", "style", "head", "nav", "footer", "noscript"}
+
+    def __init__(self) -> None:
+        super().__init__()
+        self._buf: list[str] = []
+        self._skip = 0
+
+    def handle_starttag(self, tag: str, attrs: list) -> None:
+        if tag in self._SKIP_TAGS:
+            self._skip += 1
+
+    def handle_endtag(self, tag: str) -> None:
+        if tag in self._SKIP_TAGS and self._skip:
+            self._skip -= 1
+
+    def handle_data(self, data: str) -> None:
+        if not self._skip:
+            text = data.strip()
+            if text:
+                self._buf.append(text)
+
+    def get_text(self) -> str:
+        return " ".join(self._buf)
+
+
+def _html_to_text(html: str) -> str:
+    parser = _TextExtractor()
+    parser.feed(html)
+    return re.sub(r"\s{3,}", "  ", parser.get_text())
+
+
+# ---------------------------------------------------------------------------
+# Page fetching
+# ---------------------------------------------------------------------------
+
+_HEADERS = {"User-Agent": "Mozilla/5.0 (compatible; searxng-mcp/1.0)"}
+
+
+def fetch_page_text(url: str, max_chars: int = 5000) -> str:
+    """Fetch a URL and return stripped plain text, truncated to max_chars."""
+    try:
+        r = httpx.get(url, timeout=10, follow_redirects=True, headers=_HEADERS)
+        r.raise_for_status()
+        return _html_to_text(r.text)[:max_chars]
+    except Exception:
+        return ""
+
+
+# ---------------------------------------------------------------------------
+# OCI GenAI (Gemini 2.5 Pro) enrichment
+# ---------------------------------------------------------------------------
+
+_PROMPT = """\
+You are an information extractor. Analyze the web page content below and return ONLY a valid JSON object with these fields:
+- "abstract": 2-3 sentence summary of the page content (string)
+- "date": publication or last-modified date in ISO 8601 format, or null if not found (string | null)
+- "author": author or organization name, or null if not found (string | null)
+- "tags": list of 3-5 relevant keywords (string[])
+- "content_type": one of "article", "documentation", "news", "forum", "code", "video", "other" (string)
+
+Title: {title}
+URL: {url}
+Content:
+{content}
+
+Return only the JSON object, no markdown, no explanation."""
+
+
+def _get_llm_client() -> GenerativeAiInferenceClient:
+    config = oci.config.from_file()
+    return GenerativeAiInferenceClient(
+        config,
+        service_endpoint=os.environ["OCI_GENAI_ENDPOINT"],
+    )
+
+
+def enrich_result(title: str, url: str, snippet: str) -> dict:
+    """Fetch page, then call Gemini 2.5 Pro to extract structured metadata."""
+    page_text = fetch_page_text(url)
+    content = page_text if page_text else snippet
+
+    prompt = _PROMPT.format(title=title, url=url, content=content[:4000])
+
+    try:
+        client = _get_llm_client()
+        req = GenericChatRequest(
+            messages=[UserMessage(content=[TextContent(text=prompt)])],
+            max_tokens=512,
+            temperature=0,
+        )
+        det = ChatDetails(
+            compartment_id=os.environ["OCI_COMPARTMENT_ID"],
+            serving_mode=OnDemandServingMode(
+                model_id=os.environ["OCI_CHAT_MODEL_ID"]
+            ),
+            chat_request=req,
+        )
+        response = client.chat(det)
+        raw = response.data.chat_response.choices[0].message.content[0].text.strip()
+        # Strip markdown code fences if present
+        raw = re.sub(r"^```(?:json)?\s*|\s*```$", "", raw, flags=re.MULTILINE)
+        metadata = json.loads(raw)
+    except Exception as exc:
+        metadata = {
+            "abstract": snippet,
+            "date": None,
+            "author": None,
+            "tags": [],
+            "content_type": "other",
+            "_error": str(exc),
+        }
+
+    metadata["uuid"] = str(uuid.uuid4())
+    return metadata
+
+
+def enrich_results_parallel(
+    results: list[dict],
+    max_workers: int = 5,
+) -> list[dict]:
+    """Enrich a list of search results in parallel, adding metadata to each."""
+    enriched: dict[int, dict] = {}
+
+    with ThreadPoolExecutor(max_workers=max_workers) as pool:
+        futures = {
+            pool.submit(enrich_result, r["title"], r["url"], r["content"]): i
+            for i, r in enumerate(results)
+        }
+        for future in as_completed(futures):
+            idx = futures[future]
+            try:
+                enriched[idx] = future.result()
+            except Exception as exc:
+                enriched[idx] = {"uuid": str(uuid.uuid4()), "_error": str(exc)}
+
+    return [
+        {**results[i], **enriched.get(i, {})}
+        for i in range(len(results))
+    ]

src/server.py

@@ -1,4 +1,4 @@
-"""MCP server wrapping the self-hosted SearXNG instance for free web search."""
+"""MCP server wrapping self-hosted SearXNG with Gemini 2.5 Pro enrichment."""
 
 import os
 import sys
@@ -14,24 +14,38 @@ load_dotenv(os.path.join(_project_root, ".env"))
 import httpx
 from mcp.server.fastmcp import FastMCP
 
+from src.enricher import enrich_results_parallel
+
 mcp = FastMCP(
     name="searxng",
-    instructions="Web search via self-hosted SearXNG. Use this instead of built-in WebSearch.",
+    instructions=(
+        "Web search via self-hosted SearXNG + Gemini 2.5 Pro enrichment. "
+        "Use this instead of the built-in WebSearch tool."
+    ),
 )
 
 SEARXNG_URL = os.environ.get("SEARXNG_URL", "https://searxng.cloud-handson.com")
 
 
 @mcp.tool()
-def web_search(query: str, max_results: int = 10) -> list[dict]:
+def web_search(query: str, max_results: int = 10, enrich: bool = True) -> list[dict]:
     """Search the web using the self-hosted SearXNG instance.
 
+    Each result is enriched by Gemini 2.5 Pro (via OCI GenAI) with:
+    - abstract: 2-3 sentence summary of the page
+    - date: publication date (ISO 8601) or null
+    - author: author/org name or null
+    - tags: 3-5 relevant keywords
+    - content_type: article / documentation / news / forum / code / video / other
+    - uuid: unique identifier for this result
+
     Args:
         query: The search query string.
         max_results: Maximum number of results to return (default 10).
+        enrich: Set to False to skip LLM enrichment and return raw results faster.
 
     Returns:
-        List of result dicts with keys: ``title``, ``url``, ``content`` (snippet).
+        List of enriched result dicts.
     """
     response = httpx.get(
         f"{SEARXNG_URL}/search",
@@ -41,7 +55,7 @@ def web_search(query: str, max_results: int = 10) -> list[dict]:
     response.raise_for_status()
     data = response.json()
 
-    return [
+    results = [
         {
             "title": r.get("title", ""),
             "url": r.get("url", ""),
@@ -50,6 +64,11 @@ def web_search(query: str, max_results: int = 10) -> list[dict]:
         for r in data.get("results", [])[:max_results]
     ]
 
+    if enrich and results:
+        results = enrich_results_parallel(results)
+
+    return results
+
 
 def main() -> None:
     mcp.run()