StackGen vs harness-architect
StackGen is an MCP server published by stackgenhq. Marketplaces we read that list it: 1 (Docker MCP Catalog). harness-architect is a plugin bundle for AI coding tools published by leee880619-commits. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). As of our marketplace pass on 2026-10-14. 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 |  StackGen |  harness-architect |
|---|---|---|
| Docker MCP Catalog | Listed Version: sha256:e0bab64f662a Forks (GitHub): 1 Stars (GitHub): 1 Not marked · First seen |
Not listed |
| Claude Code: claude-plugins-community | Not listed | Listed Version: 1.0.6 Forks (GitHub): 0 Stars (GitHub): 2 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 | StackGen | harness-architect |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 1 (worse) | 2 (better) |
| Forks (GitHub) (differs) | 1 (better) | 0 (worse) |
| Last release | Not published | Not published |
| Where it runs (differs) | On your machine (ghcr.io/stackgenhq/stackgen) | Installs as a plugin bundle |
| Transport (differs) | stdio | Not stated |
| Tools it declares (differs) | 4 | Not published |
| Environment variables it asks for (differs) | 2, secrets among them: 1 | Not published |
| Hooks it runs (differs) | Not published | 1 |
| Parts of the bundle (differs) | Not a bundle | 17 |
| Licence (differs) | Not stated | Apache-2.0 |
| Repository (differs) | github.com/stackgenhq/homebrew-stackgen | github.com/leee880619-commits/claudecode-harness-setup-assistant |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
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
StackGen
AI-powered DevOps assistant for managing cloud infrastructure and applications.
harness-architect
harness-architect is a meta-tool that scans any target project and builds an end-to-end Claude Code harness — CLAUDE.md, settings, rules, agents, playbooks, hooks, and MCP — through a 9-phase orchestrated workflow. The plugin enforces a strict Agent-Playbook separation (WHO / HOW): agents define identity and hand off methodology to sub-agent-only playbooks, preventing the main session from bypassing guardrails. Every phase is reviewed by an independent red-team advisor that produces BLOCK / ASK / NOTE classifications, and cross-phase state is persisted to `docs/{request}/` so interrupted sessions resume deterministically. Target users: anyone — including non-developers — who wants a correct-from-day-one Claude Code setup on every new project without re-deriving the same 30-decision matrix each time. The plugin ships a 6-step "strict-coding" preset for complex coding projects and three Phase 1-2 branches (fresh setup / Cursor migration / harness audit).
How to run each
StackGen As a local MCP server: Docker image
claude mcp add --env "STACKGEN_TOKEN=<YOUR_STACKGEN_TOKEN>" --transport stdio stackgen -- docker run -i --rm -e STACKGEN_TOKEN ghcr.io/stackgenhq/stackgenRequires: STACKGEN_TOKEN (secret)
harness-architect As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install harness-architect@claude-communityCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
The marketplaces of harness-architect publish no list of tools, so we do not compare tools.
Settings each asks for
The marketplaces of harness-architect publish no settings it asks for, so we do not compare settings.
What it can do: StackGen · What it can do: harness-architect · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.