mentor vs AtCoder MCP Server
mentor is a plugin bundle for AI coding tools published by ShawnCholeva. Marketplaces we read that list it: 1 (Claude Code: claude-plugins-community). AtCoder MCP Server is an MCP server published by ketherworks. Marketplaces we read that list it: 1 (Official MCP Registry). 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 |  mentor |  AtCoder MCP Server |
|---|---|---|
| Claude Code: claude-plugins-community | Listed Version: 3.4.8 Forks (GitHub): 0 Stars (GitHub): 1 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.1.0 Forks (GitHub): 0 Stars (GitHub): 0 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 | mentor | AtCoder MCP Server |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 1 (better) | 0 (worse) |
| Forks (GitHub) | 0 | 0 |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (api.ksrnyx.top/oj-mcp/atcoder/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Hooks it runs (differs) | 2 | Not published |
| Parts of the bundle (differs) | 4 | Not a bundle |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/shawncholeva/mentor | github.com/ketherworks/atcoder-mcp-server |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | no remote endpoint we check | Responded 36 h ago |
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
mentor
Mentor is an inline prompt coaching plugin for Claude Code. It watches every prompt before it reaches Claude and, when it spots something worth flagging, injects a short coaching note so Claude surfaces it at the top of its response.
AtCoder MCP Server
Search AtCoder problems and fetch public problem statements through MCP.
How to run each
mentor As a Claude Code plugin
/plugin marketplace add anthropics/claude-plugins-community
/plugin install mentor@claude-communityAtCoder MCP Server As a remote MCP server
claude mcp add --transport http atcoder https://api.ksrnyx.top/oj-mcp/atcoder/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only AtCoder MCP Server has a remote endpoint we check. How we check endpoints
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: mentor · What it can do: AtCoder MCP Server · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-community/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.