upgrade-agent vs Compiler Explorer
upgrade-agent is a plugin bundle for AI coding tools published by microsoft. Marketplaces we read that list it: 1 (Copilot CLI: github/awesome-copilot). Compiler Explorer is an MCP server published by compiler-explorer. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-12. 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 |  Compiler Explorer | |
|---|---|---|
| Copilot CLI: github/awesome-copilot | Listed Version: 1.1.652 Forks (GitHub): 9 Stars (GitHub): 41 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.0.0 Forks (GitHub): 2 127 Stars (GitHub): 19 126 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 | upgrade-agent | Compiler Explorer |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 41 (worse) | 19 126 (better) |
| Forks (GitHub) (differs) | 9 (worse) | 2 127 (better) |
| Last release | Not published | Not published |
| Where it runs (differs) | Installs as a plugin bundle | Remote server (godbolt.org/mcp) |
| Transport (differs) | Not stated | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/microsoft/upgrade-agent-plugins | github.com/compiler-explorer/compiler-explorer |
| 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 | not checked yet |
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
upgrade-agent
AI-powered upgrade assistant for upgrading and migrating applications. Helps modernize legacy code and upgrade .NET applications to current frameworks.
Compiler Explorer
Compile code with thousands of compilers, inspect the assembly, and share godbolt.org links
How to run each
upgrade-agent
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
Compiler Explorer As a remote MCP server
claude mcp add --transport http compiler-explorer https://godbolt.org/mcpCommands 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: upgrade-agent · What it can do: Compiler Explorer · Compare two other plugins
Data comes from the public marketplace file https://github.com/github/awesome-copilot/blob/HEAD/.github/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.