PostKing: Reddit Growth

Build a fit-scored subreddit pool, match content to the best communities with posting angles, and rewrite posts natively for Reddit.

Reddit Growth

Grow a brand's presence on Reddit the way Reddit actually rewards: find the communities that fit, match a specific piece of content to the best ones with a tailored angle, and rewrite it in native Reddit voice — then hand it to the human to review and post.

When to Use

Use this skill when a user wants to find subreddits that fit their brand, match an existing piece of content (blog post, post draft) to the best-fit communities with a posting angle, or get a Reddit-native rewrite of content before posting it themselves.

When NOT to Use

Not for automatically publishing to Reddit — PostKing never posts on the brand's behalf; this skill only prepares review-ready drafts. Not for other-platform content generation or scheduling — that's postking-social/postking. Not for applying a saved voice profile in general — that's postking-brand-voice (this skill only consumes a voiceId from it).

Minimal tool subset

This skill needs only these tools out of PostKing's 200+:

• reddit_generate_pool — crawl Reddit and build the brand's fit-scored subreddit pool from brand signals (async).
• reddit_get_pool — read the saved pool, sorted most-relevant first; each row includes posting_style and no_promotion_reason.
• reddit_discover_subreddits — search Reddit with explicit queries for candidates beyond the brand-signal pool (sync, 15 credits flat).
• reddit_add_to_pool — add chosen subreddits to the pool by name (sync, 0 credits).
• reddit_remove_from_pool — prune subreddits from the pool by name (sync, 0 credits).
• reddit_suggest — match a piece of content to up to 8 best-fit subreddits with posting angles (sync, 0 credits).
• reddit_rewrite — natively rewrite a post for a specific subreddit, optionally in a saved voice.
• reddit_list_posts — list previously rewritten Reddit posts.
• list_voices — get a voiceId to pass into reddit_rewrite.
• get_job — poll reddit_generate_pool.

Optional: reddit_global_pool — informational stats on the global known-subreddit dataset (not brand-specific). get_post — fallback poll if reddit_rewrite times out and returns a postId instead of a finished draft.

Prerequisites

1. Authenticated with credits — see the postking-getting-started skill.
2. A brand already onboarded — see the postking-getting-started skill.

Procedure

"Find subreddits for us and turn this blog post into a Reddit post."

Async tools return { operationId, status } — poll get_job({ operationId }) until state is completed, failed, partially_failed, or cancelled.

1. Build the pool. reddit_generate_pool({ brandId }) → async, poll get_job. Crawls Reddit and builds the brand's fit-scored subreddit pool from brand signals alone. Only needs to run once per brand (re-run occasionally to refresh). See "Manual subreddit curation" below for the alternative/companion path when the user wants to search in a specific direction instead of (or in addition to) this brand-signal crawl.
2. Review the pool. reddit_get_pool({ brandId, top }) — the fit-scored subreddit pool, most relevant first. This is the brand-level match: no content needed yet. Each row's posting_style and no_promotion_reason fields are where you read a community's posting norms and promo tolerance — there is no separate "get subreddit rules" tool, it's surfaced here.
3. Match content. reddit_suggest({ postId }) (an existing BlogArticle id) or reddit_suggest({ title, content, detail: "medium" }) (pasted content) — returns up to 8 best-fit subreddits from the pool, each with 2–3 posting angles (angle type + tailored title + framing hook), match_score, promotion_mode, buyer_intent, reason, and rule_to_watch. Use detail: "medium" to get all angles plus reason/rule_to_watch. Requires the pool from step 1 to exist.
4. (Optional) Pick a voice. list_voices({}) → get a voiceId, or use "none" for no voice. See the postking-brand-voice skill for details on managing voice profiles.
5. Rewrite natively. reddit_rewrite({ subreddit, voiceId, sourcePostId, angle, length, variations }) (or sourceContent + optional sourceTitle instead of sourcePostId) — subreddit and angle should come from reddit_suggest's results; voiceId is required. Usually returns the finished post inline; if it returns a postId instead, poll get_post({ postId }) until operationStatus is COMPLETED.
6. Review saved posts. reddit_list_posts({ brandId }) — cursor-paginated list of past rewrites, each with outputData (redditTitle, body, notes, wordCount, angle, length, subreddit).

Important — Reddit is repurpose-to-review, not scheduled publishing. PostKing does not post to Reddit on the brand's behalf. reddit_rewrite produces a review-ready native draft; the human copies it into Reddit and posts it themselves. Always surface the suggested rule_to_watch and promotion_mode to the user before they post, so they don't get a post removed for breaking a community's rules.

Manual subreddit curation

reddit_generate_pool only finds subreddits from brand signals. Use this path instead (or alongside it) when the user wants to search in a specific direction — a competitor's niche, a product category, a named community they've heard of.

1. Discover. reddit_discover_subreddits({ queries, context, minSubs }) — 1–8 explicit search queries, sync, 15 credits flat per call regardless of cache state. Pass context to disambiguate ambiguous terms (e.g. a brand name that also means something else). Returns candidates sorted by subscriber count, each flagged already_in_pool and already_cached. This only returns candidates — it does not add anything to the pool.
2. Add. reddit_add_to_pool({ names }) — add the user's picks by name, 1–25 per call, free. Each name is resolved live against Reddit and merged into the pool. Partial success is normal, not an error: check the returned failed array — retryable: true means a transient lookup failure (retry the call), retryable: false means the subreddit itself can't be added (nonexistent/banned/private).
3. Remove. reddit_remove_from_pool({ names }) — prune by name, 1–50 per call, free, case-insensitive. Brand-scoped unsubscribe only — it never touches the platform's global subreddit cache, so re-adding later is cheap. Names not currently in the pool come back in notFound, which is still success.

Note: reddit_rewrite auto-adds whatever subreddit(s) it targets to the pool at rewrite time, before the draft is even reviewed — so reddit_add_to_pool isn't a prerequisite for rewriting. Use it when curating the pool ahead of time, independent of any single rewrite, and use reddit_remove_from_pool afterward to prune anything a rewrite auto-added that the user doesn't want kept.

CLI fast path

The reddit_* tools are MCP-only today — there is no pking CLI equivalent.

Expected Output

A fit-scored subreddit pool for the brand, a shortlist of best-fit communities with tailored angles for a given piece of content, and a Reddit-native rewritten draft (with rule/promotion-mode guidance) ready for human review and posting.

Pitfalls

• Empty pool / "no subreddit pool yet" on reddit_suggest or reddit_rewrite — run reddit_generate_pool and poll get_job to completion first.
• Expecting reddit_discover_subreddits to save results — it only returns candidates; call reddit_add_to_pool with the chosen names to actually add them.
• Subreddit not in pool on reddit_rewrite — pick a subreddit value from reddit_get_pool or a reddit_suggest result rather than typing one in.
• INSUFFICIENT_CREDITS — surface the checkoutUrl from the error envelope and stop, or hand off to the postking-getting-started skill's billing section (billing_list_packs → billing_topup).
• RATE_LIMITED — back off using the retryAfter value from the error envelope before retrying.
• UNAUTHORIZED — re-run the login flow described in the postking-getting-started skill.

Verification

• reddit_get_pool({ brandId }) should return a non-empty pool after reddit_generate_pool completes.
• reddit_list_posts({ brandId }) should include the new draft after reddit_rewrite finishes.