SEO

Hashtag Science

Hashtag Science is an SEO skill for Claude Code, published by revfactory in harness-100.

1.2K stars427 forkson revfactory/harness-100Added 2026/08/12+1% in starsRepository updated 2026/03/22

Install in seconds

Install Hashtag Science

Copy Hashtag Science into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/revfactory/harness-100/tree/main/en/10-social-media-manager/.claude/skills/hashtag-science ~/.claude/skills/hashtag-science

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/revfactory/harness-100.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: en/10-social-media-manager/.claude/skills/hashtag-science/skill.md in revfactory/harness-100
Installs to: ~/.claude/skills/hashtag-science
Collection: One of 51 skills cataloged from this repository
Category: SEO — 164 skills

What Hashtag Science does

Hashtag Science helps an agent design hashtag sets using pyramid tiers, competition analysis, trend signals, and platform-specific limits. Use it for hashtag research, keyword strategy, and choosing tags for Instagram, TikTok, LinkedIn, or X.

Hashtag Science is cataloged under SEO on DirSkills.

Documentation

README

Excerpt

        /\
       / 1 \  <- Large (1M+ posts)
      /------\     2-3: Discovered with luck
     /   2    \  <- Medium (100K-1M)
    /----------\     5-7: Core battlefield
   /      3     \  <- Small (10K-100K)
  /--------------\     5-8: Targeted reach
 /         4      \  <- Niche (under 10K)
/------------------\     3-5: Community entry

Role by Tier

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Hashtag Science

What else does revfactory publish alongside Hashtag Science?
Hashtag Science is one of 51 skills that DirSkills catalogs from revfactory/harness-100, the repository it ships in. Its siblings there include Ad Copywriting Formulas, Advertising Campaign and Argumentation Framework. Each one is a separate skill with its own page in this directory, installs the same way Hashtag Science does, and is maintained by revfactory in that same repository. The rest of the collection is listed on the revfactory/harness-100 page.
How does Hashtag Science compare to other SEO skills?
Hashtag Science ranks #76 by stars among the 164 SEO skills in this catalog. The most-starred ones next to it are App Store Optimization, Answer Engine Optimization and SEO Analysis. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Hashtag Science against them. Open each page to compare what they document and how they install.