claude-harness vs fde-os
claude-harness is a plugin bundle for AI coding tools published by Chachamaru127. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). fde-os is a plugin bundle for AI coding tools published by suboss87. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). As of our marketplace pass on 2026-10-13. 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 |  claude-harness |  fde-os |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 5.6.0 Forks (GitHub): 302 Stars (GitHub): 3 160 Not marked · First seen |
Listed Version: 3.9.20 Forks (GitHub): 107 Stars (GitHub): 960 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 | claude-harness | fde-os |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 3 160 (better) | 960 (worse) |
| Forks (GitHub) (differs) | 302 (better) | 107 (worse) |
| Last release | Not published | 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 |
| Hooks it runs (differs) | 68 | 3 |
| Parts of the bundle (differs) | 52 | 4 |
| Licence | MIT | MIT |
| Repository (differs) | github.com/chachamaru127/claude-code-harness | github.com/suboss87/fdeops |
| 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
claude-harness
Autonomous Plan → Work → Review cycle for Claude Code. Go-native engine with 25× faster hooks, runtime guardrails on .git/ / secrets / destructive commands, and SSOT memory — designed for solo developers ("Vibecoders") who ship full-cycle contract work.
fde-os
FDEOS makes Claude operate like an experienced Forward Deployed Engineer. It brings the judgment FDEs need that generic AI lacks: when to challenge the brief, how to earn trust before touching code, how to build safely in a codebase you did not create, and how to hand over clean when the engagement ends. 13 skills covering the full FDE lifecycle from first meeting to final handoff. Enterprise overlays for healthcare (HIPAA), fintech (PCI-DSS), and government (FedRAMP) activate when the context is detected
How to run each
claude-harness As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install claude-harness@claude-communityfde-os As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install fde-os@claude-communityCommands 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: claude-harness · What it can do: fde-os · Compare two other plugins
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.