diff --git a/libraries/java/Claritas.jar b/libraries/java/Claritas.jar
index ffaa9ad4..9cf05018 100644
Binary files a/libraries/java/Claritas.jar and b/libraries/java/Claritas.jar differ
diff --git a/src/model/claritas/ClaritasResult.ts b/src/model/claritas/ClaritasResult.ts
index a431e1c0..ff02d486 100644
--- a/src/model/claritas/ClaritasResult.ts
+++ b/src/model/claritas/ClaritasResult.ts
@@ -1,22 +1,40 @@
 export interface ClaritasModuleMetadata {
     
     /**
-     * Present on ForgeMods
+     * Present on ForgeMods (1.7-1.12) of type MOD.
+     * Possibly present on ForgeMods (1.7-1.12) of type CORE_MOD.
+     * Always present on ForgeMods 1.13+.
+     * Never present in all other circumstances.
      */
     id?: string
     /**
-     * Always Present
+     * Never present on ForgeMods (1.7-1.12) of type UNKNOWN.
+     * Present in all other circumstances.
      */
-    group: string
+    group?: string
     /**
-     * Possibly present on ForgeMods 1.12-
+     * Possibly present on ForgeMods (1.7-1.12).
+     * Never present in all other circumstances.
      */
     version?: string
     /**
-     * Possibly present on ForgeMods 1.12-
+     * Possibly present on ForgeMods (1.7-1.12).
+     * Never present in all other circumstances.
      */
     name?: string
+    /**
+     * Always present on ForgeMods (1.7-1.12).
+     * Never present in all other circumstances.
+     */
+    modType?: ForgeModType_1_7
+
+}
 
+export enum ForgeModType_1_7 {
+    MOD = 'MOD',
+    CORE_MOD = 'CORE_MOD',
+    TWEAKER = 'TWEAKER',
+    UNKNOWN = 'UNKNOWN'
 }
 
 export interface ClaritasResult {
diff --git a/src/model/struct/model/module/forgemod/forgemod17.struct.ts b/src/model/struct/model/module/forgemod/forgemod17.struct.ts
index ac7cdd1b..5f349436 100644
--- a/src/model/struct/model/module/forgemod/forgemod17.struct.ts
+++ b/src/model/struct/model/module/forgemod/forgemod17.struct.ts
@@ -5,6 +5,7 @@ import { McModInfo } from '../../../../forge/mcmodinfo'
 import { McModInfoList } from '../../../../forge/mcmodinfolist'
 import { BaseForgeModStructure } from '../forgemod.struct'
 import { MinecraftVersion } from '../../../../../util/MinecraftVersion'
+import { ForgeModType_1_7 } from '../../../../claritas/ClaritasResult'
 
 export class ForgeModStructure17 extends BaseForgeModStructure {
 
@@ -131,6 +132,18 @@ export class ForgeModStructure17 extends BaseForgeModStructure {
         if(cRes == null) {
             this.logger.error(`Claritas failed to yield metadata for ForgeMod ${name}!`)
             this.logger.error('Is this mod malformated or does Claritas need an update?')
+        } else {
+            switch(cRes.modType!) {
+                case ForgeModType_1_7.CORE_MOD:
+                    this.logger.warn(`CORE_MOD Discovered: ForgeMod ${name} has no @Mod annotation. Metadata inference capabilities are limited.`)
+                    break
+                case ForgeModType_1_7.TWEAKER:
+                    this.logger.warn(`TWEAKER Discovered: ForgeMod ${name} has no @Mod annotation. Metadata inference capabilities may be limited.`)
+                    break
+                case ForgeModType_1_7.UNKNOWN:
+                    this.logger.error(`Jar file ${name} is not a ForgeMod. Is it a library?`)
+                    break
+            }
         }
 
         const claritasId = cRes?.id