Add MongoDB skill to skills folder and update skill index

mongodb/SKILL.md

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+---
+name: mongodb
+description: Interact with the MongoDB instance at docdb.connorrhodes.com. Use this skill whenever the user wants to query, insert, update, or delete data in MongoDB, list databases or collections, explore schema, run aggregations, or do anything involving their database. Also trigger when the user mentions "mongo", "docdb", or "database" in a context that could involve their self-hosted instance.
+version: 1.0.0
+---
+
+# MongoDB Interaction
+
+Connect to and interact with the MongoDB instance using Python (`pymongo`) with `uv` for dependency management.
+
+## Connection Details
+
+- **Host**: `docdb.connorrhodes.com`
+- **Port**: `35563`
+- **Username**: `root`
+- **Password**: `3wwfoUjyk2E2zWELXFlLuHqfw1ALlOp4pb2H5Vq3TImbMIHL2h1u8Jej2mjzCPl`
+- **Connection string**: `mongodb://root:3wwfoUjyk2E2zWELXFlLuHqfw1ALlOp4pb2H5Vq3TImbMIHL2h1u8Jej2mjzCPl@docdb.connorrhodes.com:35563`
+
+## How to Run Scripts
+
+Always use `uv` with an inline dependency declaration so there's no project setup needed:
+
+```bash
+uv run --with pymongo script.py
+```
+
+This handles installing pymongo automatically. No venv or requirements.txt needed.
+
+## Pattern for Scripts
+
+Every script should follow this structure. The connection helper at `scripts/connect.py` can be imported to avoid repeating boilerplate — read it and copy it into a standalone script or import it directly:
+
+```python
+from pymongo import MongoClient
+
+client = MongoClient("mongodb://root:3wwfoUjyk2E2zWELXFlLuHqfw1ALlOp4pb2H5Vq3TImbMIHL2h1u8Jej2mjzCPl@docdb.connorrhodes.com:35563")
+```
+
+### Exploring the database
+
+When the user asks exploratory questions (e.g., "what's in my database?", "show me the data"), start by listing databases and collections to understand what's there before running targeted queries:
+
+```python
+from pymongo import MongoClient
+
+client = MongoClient("mongodb://root:3wwfoUjyk2E2zWELXFlLuHqfw1ALlOp4pb2H5Vq3TImbMIHL2h1u8Jej2mjzCPl@docdb.connorrhodes.com:35563")
+
+for db_name in client.list_database_names():
+    print(f"Database: {db_name}")
+    db = client[db_name]
+    for coll_name in db.list_collection_names():
+        count = db[coll_name].estimated_document_count()
+        print(f"  {coll_name} ({count} docs)")
+```
+
+### Querying documents
+
+```python
+from pymongo import MongoClient
+
+client = MongoClient("mongodb://root:3wwfoUjyk2E2zWELXFlLuHqfw1ALlOp4pb2H5Vq3TImbMIHL2h1u8Jej2mjzCPl@docdb.connorrhodes.com:35563")
+db = client["database_name"]
+collection = db["collection_name"]
+
+for doc in collection.find({"field": "value"}).limit(10):
+    print(doc)
+```
+
+### Inserting documents
+
+```python
+result = collection.insert_one({"key": "value"})
+print(f"Inserted: {result.inserted_id}")
+```
+
+For bulk inserts:
+```python
+result = collection.insert_many([{"key": f"val{i}"} for i in range(100)])
+print(f"Inserted {len(result.inserted_ids)} documents")
+```
+
+### Updating documents
+
+```python
+result = collection.update_one(
+    {"field": "match_value"},
+    {"$set": {"field": "new_value"}}
+)
+print(f"Matched: {result.matched_count}, Modified: {result.modified_count}")
+```
+
+### Deleting documents
+
+```python
+result = collection.delete_many({"field": "value"})
+print(f"Deleted: {result.deleted_count}")
+```
+
+### Aggregation pipeline
+
+```python
+pipeline = [
+    {"$group": {"_id": "$category", "count": {"$sum": 1}}},
+    {"$sort": {"count": -1}}
+]
+for doc in collection.aggregate(pipeline):
+    print(doc)
+```
+
+## Guidelines
+
+- Always use `uv run --with pymongo` to execute scripts — no manual venv or pip.
+- For one-off queries, write the script inline and run it directly. Don't create persistent files unless the user asks.
+- When exploring an unfamiliar database, list databases and collections first with document counts, then sample a few documents from relevant collections before running the user's actual query.
+- Use `.limit()` when previewing data to avoid dumping huge result sets.
+- For large results, consider using `.count_documents(filter)` first to warn the user about scale.
+- Pretty-print documents with `pprint` or JSON formatting for readability.
+- Close the client when done: `client.close()` — though for short scripts this isn't strictly necessary.