Use when verifying whether a Minecraft mod has a build for a specific MC version and modloader before recommending KEEP, ADD, REPLACE, or REMOVE for that mod.
How this skill is triggered — by the user, by Claude, or both
Slash command
/minecraft-prism-client:compat-checkThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Verify a mod has an actual build for the target MC version before including it in any verdict or recommendation. Run this for EVERY mod assessed and EVERY gap candidate — never skip.
Verify a mod has an actual build for the target MC version before including it in any verdict or recommendation. Run this for EVERY mod assessed and EVERY gap candidate — never skip.
For each mod, call Modrinth:
GET https://api.modrinth.com/v2/project/{slug}/version?game_versions=["{mc-version}"]&loaders=["{loader}"]
If the slug is unknown, find it first:
GET https://api.modrinth.com/v2/search?query={mod-name}&facets=[["project_type:mod"]]
Take the top result's slug.
| Result | Status | Action |
|---|---|---|
| Versions returned, game version matches exactly | ✓ exact | Use latest version + date |
No results → retry with minor series (e.g. 1.21.1 for target 1.21.11) → found | ~ minor | Flag as unconfirmed |
| No results on Modrinth → check CurseForge / GitHub | ? external | Note source |
| Nothing found anywhere | ✗ none | Block — see rules |
For every ADD candidate, also check its required dependencies:
GET https://api.modrinth.com/v2/project/{slug}/version?game_versions=["{mc-version}"]&loaders=["{loader}"]
Read dependencies array. For each required dep not already in the user's mod list, run this same procedure on it. If any required dep has ✗ none, the candidate cannot be recommended.
✗ none → NEVER recommend KEEP, ADD, or REPLACE with this mod. Flag as INCOMPATIBLE (user mod) or drop from gap list (candidate).~ minor → May include, but flag in report as "unconfirmed for exact version".? external → Include with source noted.✗ none → Drop the candidate entirely; note why.Add to every row in the Category Report:
| Compat | Latest for target | Date |
| ✓ exact | 0.21.3+1.21.11 | 2026-02 |
| ~ minor | 0.21.2+1.21.1 | 2025-11 |
| ✗ none | — | — |
In a real audit run, 6 category agents recommended ADD for 14 mods without verifying exact 1.21.11 builds. The versions:1.21.11 Modrinth search facet filters results but does not confirm that a downloadable JAR for exactly 1.21.11 exists — a mod can appear in search results via minor-series matching. This skill closes that gap.
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