added things related to routing

.claude/skills/norwegian-legal-research/SKILL.md

@@ -599,6 +599,72 @@ https://lovdata.no/lov/2005-06-17-64/§2-1
 - Text-based numbering (supports "8a", "III", "første ledd")
 - Parent-child relationships between provisions
 
+### Document Type Routing
+**Choosing the correct MCP tool based on document identifiers:**
+
+**Document Type Identification by Prefix:**
+
+| Prefix | Document Type | Source Table | Correct MCP Tool |
+|--------|--------------|--------------|------------------|
+| `NL/lov/...` | Current consolidated law | `lover` | `get_lov(identifier)` |
+| `NL/forskrift/...` | Current regulation | `lover` | `get_lov(identifier)` |
+| `SF/forskrift/...` | Central regulation (Sentrale Forskrifter) | `lover` | `get_lov(identifier)` |
+| `LTI/lov/...` | Historical gazette law | `lovtidender` | `get_full_lovtidend(lovtidend_id)` |
+| `LTI/forskrift/...` | Historical gazette regulation | `lovtidender` | `get_full_lovtidend(lovtidend_id)` |
+
+**Using Search Result Metadata:**
+
+When search tools return results, they include a `"source"` field:
+
+- `"source": "forskrift"` → Use provision tools (`get_forskrift`)
+- `"source": "lovtidendebestemmelse"` → Use gazette provision tools (`get_lovtidendebestemmelse`)
+- `"source": "lovtidend"` → Use `get_full_lovtidend(doc_id)`
+
+**Routing Decision Tree:**
+
+```
+1. Did you get doc_id from search results?
+   → Check the "source" field:
+      - "lovtidend" → get_full_lovtidend(doc_id)
+      - "forskrift" → get_forskrift(id) or get_lov(law_doc_id)
+      - "lovtidendebestemmelse" → get_lovtidendebestemmelse(id)
+
+2. Do you have a raw doc_id string?
+   → Check prefix:
+      - Starts with "LTI/" → get_full_lovtidend(doc_id)
+      - Starts with "NL/" or "SF/" → get_lov(doc_id)
+      - No prefix (slug) → get_lov(identifier)
+```
+
+**Common Errors to Avoid:**
+
+❌ **Wrong:** Using `get_lov("LTI/lov/2001-05-18-24")`
+✅ **Correct:** Using `get_full_lovtidend("LTI/lov/2001-05-18-24")`
+
+❌ **Wrong:** Ignoring the `"source"` field from search results
+✅ **Correct:** Routing based on `"source"` metadata
+
+**Example Workflow:**
+
+```
+1. Search: search_all_forskrifter_fts("helseregisterloven")
+2. Results include: {
+     "doc_id": "LTI/lov/2001-05-18-24",
+     "source": "gazette_document",
+     ...
+   }
+3. Correct tool: get_full_lovtidend("LTI/lov/2001-05-18-24")
+```
+
+**Note on Multiple Versions:**
+
+Norwegian laws may exist in multiple forms:
+- **Current consolidated version** (`NL/` prefix) - Recommended for current law
+- **Original gazette version** (`LTI/` prefix) - Historical reference
+- **Amendment versions** (`LTI/` prefix) - Track legislative changes
+
+Always verify you're using the appropriate version for your research purpose.
+
 ### Search Result Processing
 **Converting system output to legal analysis:**