discord bot coding function calls - function

Question

A good portion of the code right now is me trying to figure out what I am doing wrong, so I am printing a few things here and there.
My goal:
Retrieve number of messages in a specific discord channel, and delete any new messages that exceed the limit of 10 (haven't implemented deletion yet)
I want this to be an event (currently a command for testing) that is called whenever a member tries to post a message in said channel
Planning on using message.channel when I swap to an on_messege event, and hopefully I can figure it all out from there...
The msg counter function does work when I call it just using !numMsg (with both ctx and when I add the channel name myself i.e. !numMsg channel-name)
# delete new messages if 10 already exist in channel
#bot.command(name = 'test')
async def test(ctx):
print('in here')
print(ctx.channel.id)
num = await message_count(ctx.channel)
await ctx.send(num)
# msg counter
#bot.command(name = 'numMsg')
async def message_count(ctx, channel: discord.TextChannel=None):
print('in here 2')
print(channel)
channel = channel or ctx.channel
count = 0
async for _ in channel.history(limit=None):
count += 1
return count
#await ctx.send(count)
#await ctx.send("There were {} messages in {}".format(count, channel.mention))
Here is the output:
Here is how I change the code slightly to confirm the function itself works:
# msg counter
#bot.command(name = 'numMsg')
async def message_count(ctx, channel: discord.TextChannel=None):
print('in here 2')
print(channel)
channel = channel or ctx.channel
count = 0
async for _ in channel.history(limit=None):
count += 1
#return count
await ctx.send(count)
#await ctx.send("There were {} messages in {}".format(count, channel.mention))