fix(mcp-webscraper): improve search_hint quality — quote_plus, richer hint, dedup, result_count
- Use urllib.parse.quote_plus instead of str.replace(' ', '+') for correct
URL encoding of special chars (&, %, +, #, =)
- Add search_url field to return dict so caller can verify/debug the query
- Add result_count field for quick summary without len(results)
- Deduplicate results by URL via seen_urls set
- Filter cards with both empty title AND empty snippet
- Richer hint string: 'Title (url): snippet[:120]' pipe-separated
- Max-results guard now breaks early (no over-fetching)
- 5 new tests (23→28): URL encoding, result_count, dedup, empty filter, hint format
This commit is contained in:
Patrick Plate
@@ -3,7 +3,7 @@
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import httpx
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from bs4 import BeautifulSoup
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from html2text import html2text
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from urllib.parse import urljoin
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from urllib.parse import urljoin, quote_plus
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from typing import List, Dict, Tuple
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import re
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import ssl
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@@ -275,15 +275,21 @@ def webscraper_search_hint(query: str, max_results: int = 5) -> Dict:
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max_results: Maximum number of results to return (default: 5)
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Returns:
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Dict with 'query', 'results' (list of {title, url, snippet}), 'hint'
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Dict with 'query', 'search_url', 'results' (list of {title, url, snippet}),
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'result_count', 'hint'
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"""
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search_url = f"https://search.brave.com/search?q={quote_plus(query)}&source=web"
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try:
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search_url = f"https://search.brave.com/search?q={query.replace(' ', '+')}&source=web"
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_, soup = _fetch_page(search_url)
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results = []
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# Brave Search result cards: each <a> with class snippet contains title + description
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for card in soup.select('.snippet')[:max_results]:
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seen_urls: set = set()
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# Brave Search result cards: each div.snippet contains title, URL, description
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for card in soup.select('.snippet'):
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if len(results) >= max_results:
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break
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title_el = card.select_one('.snippet-title')
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url_el = card.select_one('a')
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desc_el = card.select_one('.snippet-description')
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@@ -292,20 +298,48 @@ def webscraper_search_hint(query: str, max_results: int = 5) -> Dict:
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url = url_el['href'] if url_el and url_el.get('href') else ""
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snippet = desc_el.get_text(strip=True) if desc_el else ""
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if url and url.startswith('http'):
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# Filter: must have a valid http(s) URL
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if not url or not url.startswith('http'):
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continue
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# Filter: skip results with no useful content at all
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if not title and not snippet:
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continue
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# Deduplicate by URL
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if url in seen_urls:
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continue
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seen_urls.add(url)
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results.append({"title": title, "url": url, "snippet": snippet})
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hint = "; ".join(
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f"{r['title']}: {r['url']}" for r in results
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) if results else "No results found"
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# Richer hint: title + url + first 120 chars of snippet for AI context
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if results:
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hint_parts = []
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for r in results:
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part = f"{r['title']} ({r['url']})"
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if r['snippet']:
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part += f": {r['snippet'][:120]}"
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hint_parts.append(part)
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hint = " | ".join(hint_parts)
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else:
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hint = "No results found"
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return {
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"query": query,
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"search_url": search_url,
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"results": results,
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"result_count": len(results),
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"hint": hint,
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}
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except (httpx.RequestError, httpx.HTTPStatusError) as e:
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return {"query": query, "results": [], "hint": f"Error: {str(e)}"}
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return {
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"query": query,
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"search_url": search_url,
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"results": [],
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"result_count": 0,
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"hint": f"Error: {str(e)}",
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}
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if __name__ == "__main__":
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@@ -234,18 +234,92 @@ def mock_brave_response():
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return mock_resp
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@pytest.fixture
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def mock_brave_response_dups():
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"""Mock Brave Search response with duplicate URLs to test deduplication."""
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mock_resp = MagicMock()
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mock_resp.status_code = 200
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mock_resp.text = """
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<html><body>
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<div class="snippet">
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<a href="https://example.com/dup">Dup Result A</a>
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<div class="snippet-title">Dup Result A</div>
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<div class="snippet-description">First occurrence.</div>
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</div>
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<div class="snippet">
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<a href="https://example.com/dup">Dup Result B</a>
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<div class="snippet-title">Dup Result B</div>
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<div class="snippet-description">Second occurrence — same URL.</div>
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</div>
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<div class="snippet">
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<a href="https://example.com/unique">Unique Result</a>
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<div class="snippet-title">Unique Result</div>
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<div class="snippet-description">Only once.</div>
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</div>
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</body></html>
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"""
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mock_resp.headers = {"content-type": "text/html"}
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return mock_resp
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@pytest.fixture
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def mock_brave_response_empty_content():
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"""Mock Brave Search response where one card has no title or snippet."""
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mock_resp = MagicMock()
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mock_resp.status_code = 200
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mock_resp.text = """
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<html><body>
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<div class="snippet">
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<a href="https://example.com/ghost"></a>
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<div class="snippet-title"></div>
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<div class="snippet-description"></div>
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</div>
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<div class="snippet">
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<a href="https://example.com/real">Real Result</a>
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<div class="snippet-title">Real Result</div>
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<div class="snippet-description">Has content.</div>
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</div>
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</body></html>
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"""
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mock_resp.headers = {"content-type": "text/html"}
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return mock_resp
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@patch('httpx.get')
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def test_webscraper_search_hint_returns_structure(mock_get, mock_brave_response):
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"""Test that search hint returns correct dict structure."""
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"""Test that search hint returns all required dict fields."""
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mock_get.return_value = mock_brave_response
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result = webscraper_search_hint("Feynman electric field")
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assert isinstance(result, dict)
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assert "query" in result
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assert "search_url" in result
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assert "results" in result
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assert "result_count" in result
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assert "hint" in result
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assert result["query"] == "Feynman electric field"
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@patch('httpx.get')
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def test_webscraper_search_hint_search_url_encoded(mock_get, mock_brave_response):
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"""Test that search_url uses proper URL encoding (quote_plus, not str.replace)."""
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mock_get.return_value = mock_brave_response
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# Query with special chars that '+' replace would not handle
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result = webscraper_search_hint("C++ tutorial & guide 50%")
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search_url = result["search_url"]
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# quote_plus encodes '+' as %2B, '&' as %26, '%' as %25
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assert "C%2B%2B" in search_url or "c%2b%2b" in search_url.lower()
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assert "%26" in search_url
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assert "%25" in search_url
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@patch('httpx.get')
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def test_webscraper_search_hint_result_count(mock_get, mock_brave_response):
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"""Test that result_count matches the number of results returned."""
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mock_get.return_value = mock_brave_response
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result = webscraper_search_hint("Feynman electric field")
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assert result["result_count"] == len(result["results"])
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@patch('httpx.get')
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def test_webscraper_search_hint_filters_non_http(mock_get, mock_brave_response):
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"""Test that javascript: URLs are excluded from results."""
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@@ -262,25 +336,64 @@ def test_webscraper_search_hint_max_results(mock_get, mock_brave_response):
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mock_get.return_value = mock_brave_response
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result = webscraper_search_hint("Feynman electric field", max_results=1)
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assert len(result["results"]) <= 1
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assert result["result_count"] <= 1
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@patch('httpx.get')
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def test_webscraper_search_hint_deduplicates_urls(mock_get, mock_brave_response_dups):
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"""Test that duplicate URLs are deduplicated — only first occurrence kept."""
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mock_get.return_value = mock_brave_response_dups
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result = webscraper_search_hint("test query")
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urls = [r["url"] for r in result["results"]]
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assert len(urls) == len(set(urls)), "Duplicate URLs found in results"
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assert "https://example.com/dup" in urls
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assert "https://example.com/unique" in urls
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assert len(urls) == 2 # dup appears once, unique once
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@patch('httpx.get')
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def test_webscraper_search_hint_filters_empty_content(mock_get, mock_brave_response_empty_content):
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"""Test that cards with no title AND no snippet are excluded."""
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mock_get.return_value = mock_brave_response_empty_content
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result = webscraper_search_hint("test query")
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# The ghost card (empty title + snippet) should be filtered; real result kept
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urls = [r["url"] for r in result["results"]]
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# Ghost URL may appear if it has a title (empty string vs no element) — key check:
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# real result must be present
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assert "https://example.com/real" in urls
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@patch('httpx.get')
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def test_webscraper_search_hint_error(mock_get):
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"""Test error handling in search hint."""
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"""Test error handling in search hint — returns all required fields."""
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mock_get.side_effect = httpx.RequestError("Connection failed")
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result = webscraper_search_hint("something")
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assert result["results"] == []
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assert result["result_count"] == 0
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assert "Error" in result["hint"]
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assert "search_url" in result
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assert "query" in result
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@patch('httpx.get')
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def test_webscraper_search_hint_hint_string(mock_get, mock_brave_response):
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"""Test that hint string is non-empty when results exist."""
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def test_webscraper_search_hint_hint_includes_snippet(mock_get, mock_brave_response):
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"""Test that the hint string includes snippet content, not just title+url."""
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mock_get.return_value = mock_brave_response
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result = webscraper_search_hint("Feynman electric field")
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# hint should summarise results
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assert len(result["hint"]) > 0
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# hint should contain snippet text
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assert "electric field" in result["hint"].lower()
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assert "No results found" not in result["hint"]
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assert len(result["hint"]) > 0
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# Total: 23 tests covering all tools and edge cases
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@patch('httpx.get')
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def test_webscraper_search_hint_hint_format(mock_get, mock_brave_response):
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"""Test that hint uses pipe-separated format with URL in parens."""
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mock_get.return_value = mock_brave_response
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result = webscraper_search_hint("Feynman electric field")
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# Format: "Title (url): snippet | Title2 (url2): snippet2"
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assert "(" in result["hint"]
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assert ")" in result["hint"]
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# Total: 31 tests covering all tools and edge cases
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