agent-skills vs sdlc-skills
agent-skills is a plugin bundle for AI coding tools published by Addy Osmani. Marketplaces we read that list it: 1 (Community GitHub marketplaces). sdlc-skills is a plugin bundle for AI coding tools published by TsCarpe. Marketplaces we read that list it: 1 (Community GitHub marketplaces). As of our marketplace pass on 2026-11-10. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  agent-skills | |
|---|---|---|
| Community marketplace addyosmani/agent-skills | Listed Version: 0.6.15 Forks (GitHub): 11 952 Stars (GitHub): 114 342 Not marked · First seen |
Not listed |
| Community marketplace az9713/addyosmani-agent-skills | Listed Version: 0.6.15 Forks (GitHub): 11 952 Stars (GitHub): 114 342 Not marked · First seen |
Not listed |
| Community marketplace dangindev/antigravity-awesome-workspace-skill | Removed on 2026-10-28 Version: 0.6.13 Forks (GitHub): 11 612 Stars (GitHub): 111 018 Not marked · First seen |
Not listed |
| Community marketplace tscarpe/claude-sdlc-skills | Not listed | Listed Version: not stated Forks (GitHub): 0 Stars (GitHub): 66 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | agent-skills | sdlc-skills |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 114 342 (better) | 66 (worse) |
| Forks (GitHub) (differs) | 11 952 (better) | 0 (worse) |
| Last release (differs) | 2026-10-31 | Not published |
| Where it runs | Installs as a plugin bundle | Installs as a plugin bundle |
| Transport | Not stated | Not stated |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 38 | 10 |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/addyosmani/agent-skills | github.com/tscarpe/claude-sdlc-skills |
| Changes in the last 7 days (differs) | 0 | 2 |
| First seen (differs) | 2026-10-15 | 2026-11-09 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
agent-skills
Production-grade engineering skills covering every phase of software development: spec, plan, build, verify, review, and ship.
sdlc-skills
Ten battle-tested SDLC skills: sdlc-intent (PRD digest + seven-layer audit + A/B/C risk tiering), sdlc-design (technical design: alternatives, tiered interface contracts, shared assets, C/H decisions, slicing constraints), sdlc-test (cases/dev/static/exec/spec/report with human checkpoints), sdlc-gate (risk-tiered adversarial review gate: 4/2 fresh-context subagents or self-check, plus guard_dev), sdlc-doubt (adversarial re-check of non-trivial decisions), sdlc-ui-visual (design-to-code visual restoration via screenshots: DOM geometry + pixel heatmap + tiered fix rounds), sdlc-release-check (pre-release audit: config keys, job/MQ registrations, DDL/DML grading, runbook), sdlc-guardrails (write-time red-line engine: PostToolUse hook + pre-commit + baseline scan), sdlc-sync (artifact sync bridge between local markdown and the team-facing platform), sdlc-handoff (cross-agent session handoff: self-contained card, drift check, direct takeover).
How to run each
agent-skills As a Claude Code plugin
/plugin marketplace add addyosmani/agent-skills
/plugin install agent-skills@addy-agent-skillssdlc-skills As a Claude Code plugin
/plugin marketplace add tscarpe/claude-sdlc-skills
/plugin install sdlc-skills@claude-sdlc-skillsCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: agent-skills · What it can do: sdlc-skills · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.