diff --git a/core/src/com/unciv/GUI.kt b/core/src/com/unciv/GUI.kt
index a7c26ee538..40dcb7f30f 100644
--- a/core/src/com/unciv/GUI.kt
+++ b/core/src/com/unciv/GUI.kt
@@ -9,6 +9,7 @@ import com.unciv.ui.screens.worldscreen.UndoHandler.Companion.clearUndoCheckpoin
 import com.unciv.ui.screens.worldscreen.worldmap.WorldMapHolder
 import com.unciv.ui.screens.worldscreen.WorldScreen
 import com.unciv.ui.screens.worldscreen.unit.UnitTable
+import yairm210.purity.annotations.Readonly
 
 object GUI {
 
@@ -24,6 +25,7 @@ object GUI {
         UncivGame.Current.resetToWorldScreen()
     }
 
+    @Readonly
     fun getSettings(): GameSettings {
         return UncivGame.Current.settings
     }
diff --git a/core/src/com/unciv/logic/civilization/diplomacy/DiplomacyFunctions.kt b/core/src/com/unciv/logic/civilization/diplomacy/DiplomacyFunctions.kt
index 9bab07e909..f33a4d32a4 100644
--- a/core/src/com/unciv/logic/civilization/diplomacy/DiplomacyFunctions.kt
+++ b/core/src/com/unciv/logic/civilization/diplomacy/DiplomacyFunctions.kt
@@ -87,13 +87,15 @@ class DiplomacyFunctions(val civInfo: Civilization) {
             }
         }
     }
-
+    
+    @Readonly
     fun canSignDeclarationOfFriendshipWith(otherCiv: Civilization): Boolean {
         return otherCiv.isMajorCiv() && !otherCiv.isAtWarWith(civInfo)
             && !civInfo.getDiplomacyManager(otherCiv)!!.hasFlag(DiplomacyFlags.Denunciation)
             && !civInfo.getDiplomacyManager(otherCiv)!!.hasFlag(DiplomacyFlags.DeclarationOfFriendship)
     }
 
+    @Readonly
     fun canSignResearchAgreement(): Boolean {
         if (!civInfo.isMajorCiv()) return false
         if (!civInfo.hasUnique(UniqueType.EnablesResearchAgreements)) return false
@@ -101,6 +103,7 @@ class DiplomacyFunctions(val civInfo: Civilization) {
         return true
     }
 
+    @Readonly
     fun canSignResearchAgreementNoCostWith (otherCiv: Civilization): Boolean {
         val diplomacyManager = civInfo.getDiplomacyManager(otherCiv)!!
         return canSignResearchAgreement() && otherCiv.diplomacyFunctions.canSignResearchAgreement()
@@ -109,12 +112,14 @@ class DiplomacyFunctions(val civInfo: Civilization) {
             && !diplomacyManager.otherCivDiplomacy().hasFlag(DiplomacyFlags.ResearchAgreement)
     }
 
+    @Readonly
     fun canSignResearchAgreementsWith(otherCiv: Civilization): Boolean {
         val cost = getResearchAgreementCost(otherCiv)
         return canSignResearchAgreementNoCostWith(otherCiv)
             && civInfo.gold >= cost && otherCiv.gold >= cost
     }
 
+    @Readonly
     fun getResearchAgreementCost(otherCiv: Civilization): Int {
         // https://forums.civfanatics.com/resources/research-agreements-bnw.25568/
         return ( max(civInfo.getEra().researchAgreementCost, otherCiv.getEra().researchAgreementCost)
@@ -122,12 +127,14 @@ class DiplomacyFunctions(val civInfo: Civilization) {
             ).toInt()
     }
 
+    @Readonly
     fun canSignDefensivePact(): Boolean {
         if (!civInfo.isMajorCiv()) return false
         if (!civInfo.hasUnique(UniqueType.EnablesDefensivePacts)) return false
         return true
     }
 
+    @Readonly
     fun canSignDefensivePactWith(otherCiv: Civilization): Boolean {
         val diplomacyManager = civInfo.getDiplomacyManager(otherCiv)!!
         return canSignDefensivePact() && otherCiv.diplomacyFunctions.canSignDefensivePact()
diff --git a/core/src/com/unciv/logic/civilization/managers/TechManager.kt b/core/src/com/unciv/logic/civilization/managers/TechManager.kt
index b4b0e2ce6e..b95e014aa6 100644
--- a/core/src/com/unciv/logic/civilization/managers/TechManager.kt
+++ b/core/src/com/unciv/logic/civilization/managers/TechManager.kt
@@ -189,6 +189,7 @@ class TechManager : IsPartOfGameInfoSerialization {
         return tech.prerequisites.all { isResearched(it) }
     }
 
+    @Readonly @Suppress("purity") // should be autorecognized
     fun allTechsAreResearched() = allTechsAreResearched
 
     //endregion