fix: fable_add_task_log sends content not body to match API

The MCP tool was sending {"body": ...} but the task logs API route
expects {"content": ...}, causing 400 errors.

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

fable-mcp/fable_mcp/server.py

@@ -298,7 +298,7 @@ async def fable_update_task(
 
 
 @mcp.tool()
-async def fable_add_task_log(task_id: int, body: str) -> dict:
+async def fable_add_task_log(task_id: int, content: str) -> dict:
     """Append a timestamped progress log entry to a Fable task.
 
     Use this to record work sessions, decisions, or status updates over time without
@@ -306,7 +306,7 @@ async def fable_add_task_log(task_id: int, body: str) -> dict:
     chronologically in the task view.
     """
     async with FableClient() as client:
-        return await tasks.add_task_log(client, task_id=task_id, body=body)
+        return await tasks.add_task_log(client, task_id=task_id, content=content)
 
 
 # ---------------------------------------------------------------------------

fable-mcp/fable_mcp/tools/tasks.py

@@ -87,7 +87,7 @@ async def add_task_log(
     client: FableClient,
     *,
     task_id: int,
-    body: str,
+    content: str,
 ) -> dict[str, Any]:
     """Append a log entry to a task."""
-    return await client.post(f"/api/tasks/{task_id}/logs", json={"body": body})
+    return await client.post(f"/api/tasks/{task_id}/logs", json={"content": content})

fable-mcp/tests/test_tools_tasks.py

@@ -46,9 +46,9 @@ async def test_update_task_patches(client):
 @pytest.mark.asyncio
 async def test_add_task_log_posts_to_logs_endpoint(client):
     from fable_mcp.tools.tasks import add_task_log
-    client.post = AsyncMock(return_value={"id": 1, "body": "progress"})
+    client.post = AsyncMock(return_value={"id": 1, "content": "progress"})
-    await add_task_log(client, task_id=9, body="progress")
+    await add_task_log(client, task_id=9, content="progress")
     client.post.assert_called_once()
     path = client.post.call_args[0][0]
     assert path == "/api/tasks/9/logs"
-    assert client.post.call_args[1]["json"]["body"] == "progress"
+    assert client.post.call_args[1]["json"]["content"] == "progress"