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Get subreddit details

reddit_get_subreddit
Read-only

Retrieve subreddit subscriber counts and metadata to size a community for market research. Optionally get rules and moderators for additional credits.

Instructions

Fetch one subreddit's profile: title, description, subscriber and active-user counts, age, NSFW flag, and topics. subreddit_name is the name without the r/ prefix, e.g. 'selfhosted'; a full reddit.com URL also works. Set include_settings to also get the community rules and moderator list for +2 credits (useful before posting or judging moderation culture). Costs 4 credits base. Subscriber counts here are the standard sizing signal for market research. This tool does not return posts: read the feed with reddit_get_subreddit_posts, and discover subreddits you don't know by name with reddit_search type=subreddits.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
freshnessNorecent (default) serves cached data from the last few hours when available; realtime forces a live fetch for +2 credits (refunded if we fall back to cached data). Trial keys are cached-only and reject realtime with TRIAL_CAP_EXCEEDED; paying upgrades this same key to unlock it.recent
max_creditsNoSpend ceiling for this one call. The call is rejected (nothing charged) if its quote exceeds this. Only the quote is ever reserved, never this ceiling.
subreddit_nameYesSubreddit name without the r/ prefix, e.g. 'selfhosted'. Full URLs are accepted and cleaned.
include_settingsNoAlso return rules and moderators for +2 credits.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
usageYes
commonYes
entityYes
platformYes
freshnessYes
data_as_ofYes
canonical_urlYes
schema_versionYes
platform_fieldsYes
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Discloses cost (4 credits base, +2 for settings), freshness/caching behavior (recent vs realtime, trial limitations), and confirms read-only nature. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with primary purpose, then parameter details, then sibling contrasts. Every sentence is informative; no redundant or vague phrasing.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given output schema exists, annotations are present, and schema coverage is 100%, the description covers all necessary aspects: what is returned, when to use, parameter semantics, limitations, and alternatives. Completely sufficient for an agent to correctly invoke the tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Adds context beyond schema: subreddit_name accepts r/ prefix or full URLs; include_settings adds rules/moderator list for +2 credits; freshness explains caching and trial fallback; max_credits is a spend ceiling, not a reservation. All 4 parameters are given meaningful elaboration.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it fetches a subreddit's profile with specific data fields (title, description, counts, etc.). It explicitly distinguishes from sibling tools reddit_get_subreddit_posts (for posts) and reddit_search (for discovery).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit guidance: use for subreddit details and market research; use reddit_get_subreddit_posts for posts; use reddit_search for discovery. Also advises using include_settings before posting or judging moderation culture. Mentions caching and trial key limitations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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