Subreddit growth signals assistants can pull with strict keyword rules

Reddit in Trends MCP measures subscriber change for named communities, not post text volume. Assistants must pass the subreddit name without the r/ prefix so get_trends and get_growth return the right pipeline and avoid silent mismatches.

Subreddit metrics are easy to misuse

Assistants that pass free-form topics instead of subreddit names confuse readers. The contract from Data Sources is explicit: source: "reddit" plus a subreddit identifier without r/.

When subscriber trends matter

Investors and community managers watch whether a niche is attracting members faster than adjacent boards. Brand teams watch whether criticism or fandom subs are swelling after a launch. Trends MCP keeps that signal in JSON so summaries stay tied to the returned dates.

Pairing with discussion data

For post-level context, teams still read threads manually or use Reddit discussion data positioning pages. Subscriber curves answer "is the room getting bigger" before diving into comment sentiment.

Related pages

Reddit trends, Social listening AI. Hub: MCP trend tools for assistants.

get_trends

Plot how a community grew across quarters before entering a niche.

get_trends(keyword='investing', source='reddit', data_mode='weekly')

get_growth

Measure 30D and 3M subscriber acceleration for community health reports.

get_growth(keyword='investing', source='reddit', percent_growth=['30D', '3M', '12M'])

get_ranked_trends

Rank communities or discussion topics by growth to surface Reddit momentum before mainstream coverage.

get_ranked_trends(source='reddit', sort='yoy_pct_change', limit=30)

get_top_trends

Show hottest front-page posts or world news posts right now.

get_top_trends(type='Reddit Hot Posts', limit=20)

Common questions

Subreddit name only with no r/ prefix, exactly as the Data Sources table states on trendsmcp.ai/docs. Example: technology not r/technology.
Subscriber growth for that subreddit over the supported window. It is a community-size signal, not a count of posts or comments.
reddit expects a subreddit slug while tiktok expects a hashtag or topic phrase. If the user names a community such as technology, a combined get_growth call with google search can still run when the phrase is valid on both sides, but assistants should read results carefully because the semantics differ.
get_top_trends supports Reddit Hot Posts and Reddit World News for snapshot culture checks alongside subreddit history calls.
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