get_subreddit_info crashes with KeyError: 'active_user_count'

[johntrandall]

Description

get_subreddit_info raises a KeyError: 'active_user_count' for any subreddit. Reddit's API has removed the active_user_count field from subreddit responses, causing the underlying redditwarp library to crash during model construction.

Steps to Reproduce

Call the get_subreddit_info tool with any subreddit name:

{"name": "get_subreddit_info", "arguments": {"subreddit_name": "python"}}

Error

KeyError: 'active_user_count'

Root Cause

The crash originates in redditwarp (dependency), specifically in redditwarp/models/subreddit.py:

self.viewing_count: int = -1 if (x := d['active_user_count']) is None else x

This uses bracket access (d['active_user_count']) instead of .get(), so when Reddit's API no longer includes the field, it raises KeyError.

The call chain is:

1. mcp-server-reddit calls self.client.p.subreddit.fetch_by_name(subreddit_name) in server.py
2. redditwarp constructs a Subreddit model from the API response
3. The model constructor does d['active_user_count'] on the raw JSON — crashes

Suggested Fix

Option A (upstream): File on Pyprohly/redditwarp to change d['active_user_count'] to d.get('active_user_count').

Option B (in this repo): Wrap the get_subreddit_info call in a try/except and return a degraded response (omitting active_user_count) when the field is missing.

Environment

• mcp-server-reddit: v1.26.0
• redditwarp: (latest via pip)
• Transport: supergateway (Streamable HTTP)