# FastMCP **kwargs Fix
## 🚨 Issue Resolved
**Error:** `Functions with **kwargs are not supported as tools`
**Root Cause:** FastMCP doesn't support functions with `**kwargs` parameters in tool definitions.
## ✅ **What Was Fixed**
### Before (Broken):
```python
@mcp.tool()
async def update_card(card_id: str, **updates: Any) -> dict:
# FastMCP doesn't support **kwargs
```
### After (Working):
```python
@mcp.tool()
async def update_card(
card_id: str,
title: Optional[str] = None,
description: Optional[str] = None,
priority: Optional[str] = None,
size: Optional[int] = None,
tags: Optional[list[str]] = None,
lane_id: Optional[str] = None,
position: Optional[int] = None,
) -> dict:
# Build updates dict from provided parameters
updates = {}
if title is not None:
updates["title"] = title
# ... etc for all parameters
```
## 🎯 **How It Works Now**
### Explicit Parameters
The `update_card` function now accepts explicit optional parameters:
- `title` - New card title
- `description` - New card description
- `priority` - Priority level (low, normal, high, critical)
- `size` - Card size
- `tags` - List of tags
- `lane_id` - Move to different lane
- `position` - Position in lane
### Internal Logic
The function builds an `updates` dictionary internally from the provided parameters, then passes it to the underlying `cards.update_card()` function.
## 🚀 **Usage Examples**
### Update Card Title
```python
await update_card(card_id="123", title="New Title")
```
### Update Multiple Fields
```python
await update_card(
card_id="123",
title="Updated Title",
priority="high",
tags=["urgent", "bug"]
)
```
### Move Card
```python
await update_card(
card_id="123",
lane_id="456",
position=2
)
```
## ✅ **FastMCP Compatibility**
This approach:
- ✅ Uses explicit parameters (FastMCP compatible)
- ✅ Maintains all functionality
- ✅ Provides clear parameter documentation
- ✅ Allows flexible updates
- ✅ No **kwargs issues
## 🎉 **Result**
Your FastMCP Cloud deployment should now work without the **kwargs error!
The server will:
- ✅ Start successfully
- ✅ Register all tools
- ✅ Handle card updates properly
- ✅ Be ready for Claude Desktop connection
