rubber-duck-tutor vs Delimit
rubber-duck-tutor is a plugin bundle for AI coding tools published by LeeJuOh. Marketplaces we read that list it: 1 (Community GitHub marketplaces). Delimit is an MCP server published by delimit-ai. Marketplaces we read that list it: 3 (Official MCP Registry, npm registry (MCP servers), Community GitHub marketplaces). As of our marketplace pass on 2026-10-28. 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 |  Delimit | |
|---|---|---|
| Community marketplace leejuoh/claude-code-zero | Listed Version: 3.1.3 Forks (GitHub): 4 Stars (GitHub): 53 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 3.10.4 Downloads/month (npm): 8 902 Downloads/week (npm): 963 Forks (GitHub): 5 Stars (GitHub): 23 Not marked · First seen |
| npm registry (MCP servers) | Not listed | Listed Version: 4.22.0 Downloads/month (npm): 8 902 Downloads/week (npm): 963 Forks (GitHub): 5 Stars (GitHub): 23 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 | rubber-duck-tutor | Delimit |
|---|---|---|
| Marketplaces that list it (differs) | 1 (worse) | 3 (better) |
| Stars (GitHub) (differs) | 53 (better) | 23 (worse) |
| Forks (GitHub) (differs) | 4 (worse) | 5 (better) |
| Last release (differs) | Not published | 2026-10-16 |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (delimit-cli) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Hooks it runs (differs) | 9 | 2 |
| Parts of the bundle (differs) | 8 | 6 |
| Licence | MIT | MIT |
| Repository (differs) | github.com/leejuoh/claude-code-zero | github.com/delimit-ai/delimit |
| Changes in the last 7 days (differs) | 2 | 0 |
| First seen (differs) | 2026-10-26 | 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
rubber-duck-tutor
Rubber duck tutor that keeps you engaged across the whole AI-coding lifecycle — before you ask AI to build (/duck-prebuild), once code is written and before you ship (/duck-verify, /duck-review), and when orienting to unfamiliar code (/duck-orient), plus /duck for auto-detect. /coach is its teaching sibling, manual-invocation only: /coach <topic> explains and drills a concept, /coach <file> or a bare /coach right after generating code dissects it section by section (what/why-this-way/where-it-breaks), and /coach alone surfaces an unresolved gap from a past duck session and teaches it — resolved only once you pass the exercise, not by saying you understand. Ship-point hooks triage what you just pushed against six risk categories and target the riskiest change you didn't actually discuss, fall back to retrieving an unresolved gap from a past session, or demote to a non-blocking scoreboard after three ignored confrontations in a row. Confrontation telemetry (fired/answered/ignored) is queryable from /duck-orient
Delimit
One workspace for every AI coding assistant. Shared tasks, memory, and governance.
How to run each
rubber-duck-tutor As a Claude Code plugin
/plugin marketplace add leejuoh/claude-code-zero
/plugin install rubber-duck-tutor@claude-code-zeroDelimit As a local MCP server: npm package
claude mcp add --transport stdio delimit -- npx -y delimit-cliCommands 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: rubber-duck-tutor · What it can do: Delimit · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Package data comes from the public npm registry (registry.npmjs.org). Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.