refactor(tools): decorator-based tool registry replaces monolithic tools.py

Split 2566-line tools.py into a tools/ package with @tool decorator
registration. Each tool's schema, metadata, and implementation live
together. Briefing eligibility is now a briefing=True flag instead of
a separate frozenset allowlist. Conditional inclusion (CalDAV, SearXNG)
uses requires= metadata. Public API (get_tools_for_user, execute_tool)
unchanged.

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

src/fabledassistant/services/tools/rss.py

@@ -0,0 +1,99 @@
+"""RSS and article tools."""
+
+from __future__ import annotations
+
+import logging
+
+from fabledassistant.services.tools._registry import tool
+
+logger = logging.getLogger(__name__)
+
+
+@tool(
+    name="get_rss_items",
+    description="Get recent items from the user's RSS feeds (news, blogs, Reddit, podcasts). Returns titles, URLs, and summaries of recent posts.",
+    parameters={
+        "limit": {"type": "integer", "description": "Number of items to return (default 15, max 50)"},
+        "category": {"type": "string", "description": "Filter by feed category (e.g. 'news', 'tech'). Omit for all."},
+    },
+    read_only=True,
+    briefing=True,
+)
+async def get_rss_items_tool(*, user_id, arguments, **_ctx):
+    from fabledassistant.services.rss import get_recent_items
+
+    limit = min(int(arguments.get("limit", 15)), 50)
+    items = await get_recent_items(user_id, limit=limit)
+    return {"data": {"items": items, "count": len(items)}}
+
+
+@tool(
+    name="add_rss_feed",
+    description="Add an RSS/Atom feed. Use when user asks to subscribe to or track a feed, blog, subreddit, or podcast.",
+    parameters={
+        "url": {"type": "string", "description": "The RSS/Atom feed URL to add."},
+        "category": {"type": "string", "description": "Optional category label (e.g. 'news', 'tech', 'reddit'). Omit if unsure."},
+    },
+    required=["url"],
+)
+async def add_rss_feed_tool(*, user_id, arguments, **_ctx):
+    import asyncio as _asyncio
+
+    from sqlalchemy import select as _select
+
+    from fabledassistant.models import async_session as _async_session
+    from fabledassistant.models.rss_feed import RssFeed
+    from fabledassistant.services.rss import fetch_and_cache_feed
+
+    url = str(arguments.get("url", "")).strip()
+    if not url:
+        return {"error": "url is required"}
+    category = arguments.get("category") or None
+    async with _async_session() as session:
+        existing = await session.execute(
+            _select(RssFeed).where(RssFeed.user_id == user_id, RssFeed.url == url)
+        )
+        if existing.scalars().first():
+            return {"error": "Feed already added", "url": url}
+        feed = RssFeed(user_id=user_id, url=url, title="", category=category)
+        session.add(feed)
+        await session.commit()
+        await session.refresh(feed)
+        feed_id = feed.id
+    _asyncio.create_task(fetch_and_cache_feed(feed_id, url))
+    return {"data": {"id": feed_id, "url": url, "message": "Feed added and fetching started."}}
+
+
+@tool(
+    name="read_article",
+    description=(
+        "Fetch and read the full text of a web page or article from a URL. "
+        "Use when the user shares a URL and wants you to read it, "
+        "or to get the full content of a linked page. "
+        "Do NOT use search_web for URLs — use this tool instead."
+    ),
+    parameters={
+        "url": {"type": "string", "description": "The URL to fetch and read"},
+    },
+    required=["url"],
+    read_only=True,
+    briefing=True,
+)
+async def read_article_tool(*, user_id, arguments, **_ctx):
+    from fabledassistant.services.rss import _fetch_full_article
+
+    url = arguments.get("url", "").strip()
+    if not url:
+        return {"success": False, "error": "No URL provided"}
+    content = await _fetch_full_article(url)
+    if not content:
+        return {"success": False, "error": f"Could not fetch article content from {url}"}
+    _TOOL_CONTENT_CAP = 40_000
+    truncated = len(content) > _TOOL_CONTENT_CAP
+    return {
+        "success": True,
+        "type": "article_content",
+        "url": url,
+        "content": content[:_TOOL_CONTENT_CAP],
+        "truncated": truncated,
+    }