Grade an MCP server A–F on maintenance health and adoptability — so you can choose between four servers that all claim to do the same thing.
| Grade | Score | Verdict | What it means in practice |
|---|---|---|---|
| A | 90–100 | safe to adopt | Reachable, maintained, installable and documented. |
| B | 78–89 | safe to adopt | Sound overall; one signal is weak. |
| C | 62–77 | usable with caution | Works today, but something will bite you. |
| D | 45–61 | avoid | Stale or uninstallable — pick an alternative. |
| F | 0–44 | avoid | Dead, deprecated, or the repo is gone. |
This grades the signals you supply, not the code. A server can score A and still be insecure — use the MCP Server Security Audit for that. Absence of a repository or registry entry is not proof of malice, only of missing evidence.
Two independent audits in 2026 converged on the same number: 52% of publicly listed MCP servers are dead or abandoned. The underlying registry data is blunter still — of 15,382 entries, 1,880 point to repositories that no longer exist, 218 packages have been deprecated by their own authors, and 299 have had no push in six months. This matters because MCP servers run inside your agent with your credentials; an abandoned server is not a neutral choice, it is an unpatched one. The trap is that the signal everyone reaches for first — star count — is the least reliable. A server with 300 stars and a commit last week is a better bet than one with 3,000 stars and nothing since 2024. So this scorer deliberately does not count stars: reachability, commit recency, deprecation status, installability and documentation are what actually predict whether the thing will work and keep working.
Reachability and maintenance carry 55 of the 100 points between them, because those are what separate a working server from a dead one. Install config and documentation carry 25 more — a server nobody can install or understand is unusable no matter how healthy its repo is.
Two servers both claim to expose the same GitHub toolset. One has 3,000 stars but its last commit was 400 days ago and its npm package is deprecated. The other has 180 stars, a commit 12 days ago, a working install config and documented tools.
Why did the cow cross the road?
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