Kb Lemmy

Background knowledge about Lemmy, the federated link aggregation and discussion platform (Reddit alternative). Covers Lemmy's fundamental architectural decision of Communities as Group actors that automatically Announce all content to followers, the ActivityPub object type mappings (Post as Page with mandatory title, Comment as Note with inReplyTo tree, Community as Group, User as Person, Instance as Application, Private Message as ChatMessage), voting via Like/Dislike activities (unique first-class downvotes unlike most Fediverse platforms), ranking algorithms (Active, Hot, Scaled, Top), the full activity reference (Create/Update/Delete for posts and comments, Follow/Accept for community subscription, Remove/Block/Lock for moderation, Flag for reporting, Announce for community relay), federation modes (allowlist, blocklist, open), custom namespace extensions (stickied, distinguished, commentsEnabled, postingRestrictedToMods), the Lemmy JSON-LD context (join-lemmy.org/context.json), the REST API v3 with JWT auth and pictrs image service, known interoperability issues (name vs preferredUsername reversal, JSON-LD context errors, Mastodon reply propagation failures, vote federation inconsistencies, strict parsing), the tech stack (Rust/Actix-web/Diesel/PostgreSQL backend, TypeScript/Inferno.js frontend, activitypub-federation-rust library), and the Threadiverse ecosystem (Kbin/Mbin, PieFed, Sublinks). Load when the user asks about Lemmy federation; implementing a Lemmy- compatible ActivityPub server; how Lemmy communities work as Group actors; how Lemmy voting federates; Lemmy's Page object type; how posts and comments federate in Lemmy; Lemmy's moderation activities; interoperating with Lemmy instances; the Lemmy API; or the Threadiverse.

mkdir -p ~/.claude/skills/kb-lemmy
curl -L https://claudskills.com/skills/kb-lemmy/SKILL.md \
  -o ~/.claude/skills/kb-lemmy/SKILL.md

@misc{kb-lemmy-2026,
  author    = {reiver},
  title     = {Kb Lemmy [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/kb-lemmy/}
}