diff --git a/cli/build/steps/configs_dynamic.ts b/cli/build/steps/configs_dynamic.ts
index b4bd617ac..1fb839dd4 100644
--- a/cli/build/steps/configs_dynamic.ts
+++ b/cli/build/steps/configs_dynamic.ts
@@ -68,7 +68,8 @@ export async function buildDynamicConfigs(parameters: IBuildCommandParameters):
  */
 async function getLtxConfigs(filters: Array<string> = []): Promise<Array<TFolderReplicationDescriptor>> {
   /**
-   * todo;
+   * Collect list of LTX configs for further transformation in typescript.
+   * Recursively find all ts files in configs dir.
    */
   function collectLtxConfigs(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/build/steps/configs_statics.ts b/cli/build/steps/configs_statics.ts
index 0114d69bf..e9fd05e21 100644
--- a/cli/build/steps/configs_statics.ts
+++ b/cli/build/steps/configs_statics.ts
@@ -54,7 +54,8 @@ export async function buildStaticConfigs(parameters: IBuildCommandParameters): P
  */
 async function getStaticConfigs(filters: Array<string> = []): Promise<Array<TFolderReplicationDescriptor>> {
   /**
-   * todo;
+   * Collect list of LTX configs for including in build.
+   * Recursively find all ltx files in configs dir.
    */
   function collectConfigs(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/build/steps/translations_dynamic.ts b/cli/build/steps/translations_dynamic.ts
index a59713dfe..d897bf3e4 100644
--- a/cli/build/steps/translations_dynamic.ts
+++ b/cli/build/steps/translations_dynamic.ts
@@ -36,7 +36,7 @@ export async function buildDynamicTranslations(): Promise<void> {
   }
 
   /**
-   * todo;
+   * Collect list of all dynamic translations recursively in provided directory.
    */
   function collectTranslations(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/build/steps/ui_dynamic.ts b/cli/build/steps/ui_dynamic.ts
index ea461d0ad..98dd76ecf 100644
--- a/cli/build/steps/ui_dynamic.ts
+++ b/cli/build/steps/ui_dynamic.ts
@@ -64,7 +64,7 @@ export async function buildDynamicUi(parameters: IBuildCommandParameters): Promi
  */
 async function getUiConfigs(filters: Array<string> = []): Promise<Array<TFolderReplicationDescriptor>> {
   /**
-   * todo;
+   * Collect list of ts configs for including in build and correctly transforming to XML forms.
    */
   function collectXmlConfigs(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/build/steps/ui_statics.ts b/cli/build/steps/ui_statics.ts
index 0060b3695..74fc6e9ff 100644
--- a/cli/build/steps/ui_statics.ts
+++ b/cli/build/steps/ui_statics.ts
@@ -52,7 +52,8 @@ export async function buildStaticUi(parameters: IBuildCommandParameters): Promis
  */
 async function getUiConfigs(filters: Array<string> = []): Promise<Array<TFolderReplicationDescriptor>> {
   /**
-   * todo;
+   * Collect list of XML configs for including in build.
+   * Recursively find all XML files in UI configs dir.
    */
   function collectXmlConfigs(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/format/format_ltx.ts b/cli/format/format_ltx.ts
index 33436ccee..a3419481b 100644
--- a/cli/format/format_ltx.ts
+++ b/cli/format/format_ltx.ts
@@ -50,7 +50,7 @@ async function formatLtxFile(file: string): Promise<void> {
  */
 async function getLtxConfigs(filters: Array<string> = []): Promise<Array<string>> {
   /**
-   * todo;
+   * Collect list of files for LTX formatting in provided directory.
    */
   function collectConfigs(acc: Array<string>, it: TFolderFiles): Array<string> {
     if (Array.isArray(it)) {
diff --git a/cli/parse/parse_externals.ts b/cli/parse/parse_externals.ts
index a3a1c4985..6d0e29dc8 100644
--- a/cli/parse/parse_externals.ts
+++ b/cli/parse/parse_externals.ts
@@ -44,11 +44,11 @@ export async function parseExternals(): Promise<void> {
 }
 
 /**
- * Get list of LTX transformable descriptors.
+ * @returns descriptors of files to parse and generate docs
  */
 async function getSourcesList(source: string): Promise<Array<string>> {
   /**
-   * todo;
+   * Recursively find all files with possible definitions for docs generation.
    */
   function collectList(acc: Array<string>, it: TFolderFiles): Array<string> {
     if (Array.isArray(it)) {
diff --git a/cli/parse/utils/__test__/declaration.ts b/cli/parse/utils/__test__/declaration.ts
index e024a92cb..2f32628f4 100644
--- a/cli/parse/utils/__test__/declaration.ts
+++ b/cli/parse/utils/__test__/declaration.ts
@@ -11,12 +11,12 @@ interface IAbstractInterface {
 }
 
 /**
- * todo;
+ * Mock `extern` method for testing.
  */
 function extern(name: string, cb: (...args: Array<unknown>) => void): void {}
 
 /**
- * todo;
+ * Mock `another` method for testing of incorrect module global level calls.
  */
 function another(name: string, cb: (...args: Array<unknown>) => void): void {}
 
diff --git a/cli/preview/preview.ts b/cli/preview/preview.ts
index 8267a8a55..190bd83b5 100644
--- a/cli/preview/preview.ts
+++ b/cli/preview/preview.ts
@@ -99,11 +99,11 @@ function createFoldersForConfigs(xmlConfigs: Array<TFolderReplicationDescriptor>
 }
 
 /**
- * todo;
+ * @returns list of files for preview generation
  */
 async function getUiConfigs(filters: Array<string> = []): Promise<Array<TFolderReplicationDescriptor>> {
   /**
-   * todo;
+   * Collect list of xml configs for UI preview generation in a recursive way.
    */
   function collectXmlConfigs(
     acc: Array<TFolderReplicationDescriptor>,
diff --git a/cli/utils/fs/open_folder_in_explorer.ts b/cli/utils/fs/open_folder_in_explorer.ts
index 740e0f8aa..442a4c882 100644
--- a/cli/utils/fs/open_folder_in_explorer.ts
+++ b/cli/utils/fs/open_folder_in_explorer.ts
@@ -2,7 +2,10 @@ import * as cp from "child_process";
 import * as os from "os";
 
 /**
- * todo;
+ * Open folder in OS explorer application for fast access.
+ *
+ * @param path - directory path to open
+ * @returns promise resolving on open folder command execution
  */
 export function openFolderInExplorer(path: string): Promise<void> {
   return new Promise((resolve, reject) => {
diff --git a/cli/utils/fs/read_last_lines_of_file.ts b/cli/utils/fs/read_last_lines_of_file.ts
index e2a7d7f52..15efc38af 100644
--- a/cli/utils/fs/read_last_lines_of_file.ts
+++ b/cli/utils/fs/read_last_lines_of_file.ts
@@ -7,7 +7,12 @@ import { Optional } from "#/utils/types";
 const NEW_LINE_CHARACTERS: Array<string> = ["\n"];
 
 /**
- * todo;
+ * Read last lines of some text file in a streamed way.
+ *
+ * @param filePath - full path to read file
+ * @param maxLineCount - number of lines to read from EOF
+ * @param encoding - encoding to use when reading file as text
+ * @returns last lines of text file
  */
 export async function readLastLinesOfFile(
   filePath: string,
diff --git a/src/engine/core/schemes/combat_idle/PostCombatIdle.ts b/src/engine/core/schemes/combat_idle/PostCombatIdle.ts
index a85319ce8..02730c0dd 100644
--- a/src/engine/core/schemes/combat_idle/PostCombatIdle.ts
+++ b/src/engine/core/schemes/combat_idle/PostCombatIdle.ts
@@ -10,7 +10,8 @@ import { ActionBase, ActionPlanner, ClientObject } from "@/engine/lib/types";
 const logger: LuaLogger = new LuaLogger($filename);
 
 /**
- * todo;
+ * Post combat idle scheme manager.
+ * Used to add idle state logics for game objects if it is needed.
  */
 export class PostCombatIdle {
   /**
diff --git a/src/engine/core/schemes/combat_idle/actions/ActionPostCombatIdleWait.ts b/src/engine/core/schemes/combat_idle/actions/ActionPostCombatIdleWait.ts
index 9d8807b9b..eaa17293b 100644
--- a/src/engine/core/schemes/combat_idle/actions/ActionPostCombatIdleWait.ts
+++ b/src/engine/core/schemes/combat_idle/actions/ActionPostCombatIdleWait.ts
@@ -10,7 +10,8 @@ import { ClientObject, Optional } from "@/engine/lib/types";
 const logger: LuaLogger = new LuaLogger($filename);
 
 /**
- * todo;
+ * Action to wait some time for possible remaining enemies after combat.
+ * Stalkers wait for some time and then go with alife activity / looting corpses / helping others.
  */
 @LuabindClass()
 export class ActionPostCombatIdleWait extends action_base {
@@ -80,7 +81,10 @@ export class ActionPostCombatIdleWait extends action_base {
   }
 
   /**
-   * todo;
+   * todo: Move to utils as pure function?
+   *
+   * @param object - object to check weapon staet
+   * @returns whether weapon is in locked state
    */
   public isWeaponLocked(object: ClientObject): boolean {
     const isWeaponStrapped: boolean = object.weapon_strapped();
diff --git a/src/engine/core/schemes/combat_idle/evaluators/EvaluatorPostCombatIdleEnemy.ts b/src/engine/core/schemes/combat_idle/evaluators/EvaluatorPostCombatIdleEnemy.ts
index 5638257db..dd062dcd0 100644
--- a/src/engine/core/schemes/combat_idle/evaluators/EvaluatorPostCombatIdleEnemy.ts
+++ b/src/engine/core/schemes/combat_idle/evaluators/EvaluatorPostCombatIdleEnemy.ts
@@ -10,7 +10,7 @@ import { ClientObject, Optional, TDistance, TTimestamp } from "@/engine/lib/type
 const logger: LuaLogger = new LuaLogger($filename);
 
 /**
- * todo;
+ * Evaluatore to check whether post-combat idle state should be active.
  */
 @LuabindClass()
 export class EvaluatorPostCombatIdleEnemy extends property_evaluator {
diff --git a/src/engine/forms/actor_menu.tsx b/src/engine/forms/actor_menu.tsx
index 6e7d73f88..426787c0a 100644
--- a/src/engine/forms/actor_menu.tsx
+++ b/src/engine/forms/actor_menu.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { captions } from "@/engine/lib/constants/captions";
 
 /**
- * todo;
+ * Actor menu form generation.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/actor_menu_16.tsx b/src/engine/forms/actor_menu_16.tsx
index 291e1f3ca..4ea8d0c2d 100644
--- a/src/engine/forms/actor_menu_16.tsx
+++ b/src/engine/forms/actor_menu_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { captions } from "@/engine/lib/constants/captions";
 
 /**
- * todo;
+ * Actor menu form generation for 16/9 screens.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/actor_menu_item.tsx b/src/engine/forms/actor_menu_item.tsx
index ce69c460f..e8aaa4311 100644
--- a/src/engine/forms/actor_menu_item.tsx
+++ b/src/engine/forms/actor_menu_item.tsx
@@ -4,7 +4,7 @@ import { ArtefactParams } from "@/engine/forms/af_params";
 import { BoosterParams } from "@/engine/forms/booster_params";
 
 /**
- * todo;
+ * Actor menu form item form generation.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/actor_menu_item_16.tsx b/src/engine/forms/actor_menu_item_16.tsx
index b8cd9283d..e7132931c 100644
--- a/src/engine/forms/actor_menu_item_16.tsx
+++ b/src/engine/forms/actor_menu_item_16.tsx
@@ -4,7 +4,7 @@ import { ArtefactParams } from "@/engine/forms/af_params_16";
 import { BoosterParams } from "@/engine/forms/booster_params_16";
 
 /**
- * todo;
+ * Actor menu form item form generation for 16/9 screens.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/af_params.tsx b/src/engine/forms/af_params.tsx
index f0a5454f6..da92a8ec8 100644
--- a/src/engine/forms/af_params.tsx
+++ b/src/engine/forms/af_params.tsx
@@ -1,14 +1,14 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms for artefact parameters elements.
  */
 export function create(): JSXNode {
   return <ArtefactParams />;
 }
 
 /**
- * todo;
+ * Component describing possible artefact parameters.
  */
 export function ArtefactParams(): JSXNode {
   return (
diff --git a/src/engine/forms/booster_params.tsx b/src/engine/forms/booster_params.tsx
index 73a834c03..b93e78540 100644
--- a/src/engine/forms/booster_params.tsx
+++ b/src/engine/forms/booster_params.tsx
@@ -12,7 +12,7 @@ export function create(): JSXNode {
 }
 
 /**
- * todo;
+ * Component describing booster parameters for inventory items.
  */
 export function BoosterParams(): JSXNode {
   return (
diff --git a/src/engine/forms/inventory_upgrade_info.tsx b/src/engine/forms/inventory_upgrade_info.tsx
index e76ed1bb1..4d384daa0 100644
--- a/src/engine/forms/inventory_upgrade_info.tsx
+++ b/src/engine/forms/inventory_upgrade_info.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of inventory items upgrading possible info forms.
  */
 export function create(): JSXNode {
   return <w></w>;
diff --git a/src/engine/forms/maingame.tsx b/src/engine/forms/maingame.tsx
index ca10bc1ff..b6a069445 100644
--- a/src/engine/forms/maingame.tsx
+++ b/src/engine/forms/maingame.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { GameUi } from "@/engine/forms/game/GameUi.component";
 
 /**
- * todo;
+ * Creation of UI forms related to in-game play interface.
  */
 export function create(): JSXNode {
   return <GameUi />;
diff --git a/src/engine/forms/maingame_16.tsx b/src/engine/forms/maingame_16.tsx
index 84e24276c..81ac6ec42 100644
--- a/src/engine/forms/maingame_16.tsx
+++ b/src/engine/forms/maingame_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { GameUi } from "@/engine/forms/game/GameUi.component.16";
 
 /**
- * todo;
+ * Creation of UI forms related to in-game play interface (16/9).
  */
 export function create(): JSXNode {
   return <GameUi />;
diff --git a/src/engine/forms/map_spots.tsx b/src/engine/forms/map_spots.tsx
index 95a25d82e..ee2ebd3d3 100644
--- a/src/engine/forms/map_spots.tsx
+++ b/src/engine/forms/map_spots.tsx
@@ -3,7 +3,7 @@
 import { MapSpots } from "@/engine/forms/game/map/MapSpots.component";
 
 /**
- * todo;
+ * Creation of UI forms related to in-game map spots.
  */
 export function create(): JSXNode {
   return <MapSpots />;
diff --git a/src/engine/forms/map_spots_16.tsx b/src/engine/forms/map_spots_16.tsx
index 49a8b7f42..33c591d12 100644
--- a/src/engine/forms/map_spots_16.tsx
+++ b/src/engine/forms/map_spots_16.tsx
@@ -3,7 +3,7 @@
 import { MapSpots } from "@/engine/forms/game/map/MapSpots.component.16";
 
 /**
- * todo;
+ * Creation of UI forms related to in-game map spots (16/9).
  */
 export function create(): JSXNode {
   return <MapSpots />;
diff --git a/src/engine/forms/message_box.tsx b/src/engine/forms/message_box.tsx
index 03641ac1f..34f7ea912 100644
--- a/src/engine/forms/message_box.tsx
+++ b/src/engine/forms/message_box.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of UI forms related to generic message boxes in game.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/message_box_16.tsx b/src/engine/forms/message_box_16.tsx
index 7ed4b86ff..6d6a1d8f6 100644
--- a/src/engine/forms/message_box_16.tsx
+++ b/src/engine/forms/message_box_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of UI forms related to generic message boxes in game (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/mp_buy_menu.tsx b/src/engine/forms/mp_buy_menu.tsx
index c1a965c91..a8a01dcc2 100644
--- a/src/engine/forms/mp_buy_menu.tsx
+++ b/src/engine/forms/mp_buy_menu.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { MultiplayerBuyButtons } from "@/engine/forms/menu/multiplayer/MultiplayerBuyButtons";
 
 /**
- * todo;
+ * Generation of buy menu forms for multiplayer.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/mp_buy_menu_16.tsx b/src/engine/forms/mp_buy_menu_16.tsx
index f715cf6af..2abf23099 100644
--- a/src/engine/forms/mp_buy_menu_16.tsx
+++ b/src/engine/forms/mp_buy_menu_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { MultiplayerBuyButtons16 } from "@/engine/forms/menu/multiplayer/MultiplayerBuyButtons.16";
 
 /**
- * todo;
+ * Creation of UI forms related to multiplayer buy menu (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda.tsx b/src/engine/forms/pda.tsx
index b9b09a324..2a93d043f 100644
--- a/src/engine/forms/pda.tsx
+++ b/src/engine/forms/pda.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { Pda } from "@/engine/forms/game/map/Pda.component";
 
 /**
- * todo;
+ * Generation of PDA UI forms.
  */
 export function create(): JSXNode {
   return <Pda />;
diff --git a/src/engine/forms/pda_16.tsx b/src/engine/forms/pda_16.tsx
index f55e0e696..8a6924c40 100644
--- a/src/engine/forms/pda_16.tsx
+++ b/src/engine/forms/pda_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { Pda } from "@/engine/forms/game/map/Pda.component.16";
 
 /**
- * todo;
+ * Generation of PDA UI forms for 16/9 screens.
  */
 export function create(): JSXNode {
   return <Pda />;
diff --git a/src/engine/forms/pda_character.tsx b/src/engine/forms/pda_character.tsx
index 65996e5cc..c5ec44708 100644
--- a/src/engine/forms/pda_character.tsx
+++ b/src/engine/forms/pda_character.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA character section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_dialog_character.tsx b/src/engine/forms/pda_dialog_character.tsx
index 2de21ee5b..bbd43be0c 100644
--- a/src/engine/forms/pda_dialog_character.tsx
+++ b/src/engine/forms/pda_dialog_character.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { captions } from "@/engine/lib/constants/captions";
 
 /**
- * todo;
+ * Generation of PDA character dialogs section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_dialog_character_16.tsx b/src/engine/forms/pda_dialog_character_16.tsx
index 879662e54..d7664dac8 100644
--- a/src/engine/forms/pda_dialog_character_16.tsx
+++ b/src/engine/forms/pda_dialog_character_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { captions } from "@/engine/lib/constants/captions";
 
 /**
- * todo;
+ * Generation of PDA character dialog section UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_fraction_war.tsx b/src/engine/forms/pda_fraction_war.tsx
index 800becd66..ab46251db 100644
--- a/src/engine/forms/pda_fraction_war.tsx
+++ b/src/engine/forms/pda_fraction_war.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA faction wars section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_fraction_war_16.tsx b/src/engine/forms/pda_fraction_war_16.tsx
index 14bd18e0f..d6d7211a1 100644
--- a/src/engine/forms/pda_fraction_war_16.tsx
+++ b/src/engine/forms/pda_fraction_war_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA faction war section UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_logs.tsx b/src/engine/forms/pda_logs.tsx
index e4a11734d..0af37344e 100644
--- a/src/engine/forms/pda_logs.tsx
+++ b/src/engine/forms/pda_logs.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA logs section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_logs_16.tsx b/src/engine/forms/pda_logs_16.tsx
index 9f78ebe1a..c652bb8cb 100644
--- a/src/engine/forms/pda_logs_16.tsx
+++ b/src/engine/forms/pda_logs_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA logs section UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_ranking.tsx b/src/engine/forms/pda_ranking.tsx
index 64a714cbd..d3482e3e6 100644
--- a/src/engine/forms/pda_ranking.tsx
+++ b/src/engine/forms/pda_ranking.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { gameSettingConfig } from "@/engine/lib/configs/GameSettingConfig";
 
 /**
- * todo;
+ * Generation of PDA rankings section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_ranking_16.tsx b/src/engine/forms/pda_ranking_16.tsx
index 58c6fd97e..3bc8e8287 100644
--- a/src/engine/forms/pda_ranking_16.tsx
+++ b/src/engine/forms/pda_ranking_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { gameSettingConfig } from "@/engine/lib/configs/GameSettingConfig";
 
 /**
- * todo;
+ * Generation of PDA rankings section UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_tasks.tsx b/src/engine/forms/pda_tasks.tsx
index 1fb55baad..a10ddd447 100644
--- a/src/engine/forms/pda_tasks.tsx
+++ b/src/engine/forms/pda_tasks.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA tasks section UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/pda_tasks_16.tsx b/src/engine/forms/pda_tasks_16.tsx
index 48b02989f..e08ea117f 100644
--- a/src/engine/forms/pda_tasks_16.tsx
+++ b/src/engine/forms/pda_tasks_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of PDA tasks section UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/scroll_bar.tsx b/src/engine/forms/scroll_bar.tsx
index dfb3ddbf3..dffdd3010 100644
--- a/src/engine/forms/scroll_bar.tsx
+++ b/src/engine/forms/scroll_bar.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of scroll bar UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/scroll_bar_16.tsx b/src/engine/forms/scroll_bar_16.tsx
index eb4ab3943..4fe88cccc 100644
--- a/src/engine/forms/scroll_bar_16.tsx
+++ b/src/engine/forms/scroll_bar_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of scroll bar UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/server_info.tsx b/src/engine/forms/server_info.tsx
index 9cea3b383..fb0ef7e54 100644
--- a/src/engine/forms/server_info.tsx
+++ b/src/engine/forms/server_info.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer server info UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/skin_selector.tsx b/src/engine/forms/skin_selector.tsx
index d2c837099..f77c2c936 100644
--- a/src/engine/forms/skin_selector.tsx
+++ b/src/engine/forms/skin_selector.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer skin selector UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/skin_selector_16.tsx b/src/engine/forms/skin_selector_16.tsx
index 2c80ce74b..f43acd69d 100644
--- a/src/engine/forms/skin_selector_16.tsx
+++ b/src/engine/forms/skin_selector_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer skin selector UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/spawn.tsx b/src/engine/forms/spawn.tsx
index 988406fee..e07d9fc97 100644
--- a/src/engine/forms/spawn.tsx
+++ b/src/engine/forms/spawn.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer team selection UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/spawn_16.tsx b/src/engine/forms/spawn_16.tsx
index bad26ec4b..0c9e9c067 100644
--- a/src/engine/forms/spawn_16.tsx
+++ b/src/engine/forms/spawn_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer team selection UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/stalkers_ranking_character.tsx b/src/engine/forms/stalkers_ranking_character.tsx
index d1925640f..9798e9277 100644
--- a/src/engine/forms/stalkers_ranking_character.tsx
+++ b/src/engine/forms/stalkers_ranking_character.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of character details UI forms in rankings.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/stalkers_ranking_character_16.tsx b/src/engine/forms/stalkers_ranking_character_16.tsx
index 33fd85991..0a43ca770 100644
--- a/src/engine/forms/stalkers_ranking_character_16.tsx
+++ b/src/engine/forms/stalkers_ranking_character_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of character details UI forms in rankings for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/statisticwnd.tsx b/src/engine/forms/statisticwnd.tsx
index 92ab64aed..a82b216ab 100644
--- a/src/engine/forms/statisticwnd.tsx
+++ b/src/engine/forms/statisticwnd.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of statistic window UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/stats.tsx b/src/engine/forms/stats.tsx
index 7ec5aa110..14faf8fee 100644
--- a/src/engine/forms/stats.tsx
+++ b/src/engine/forms/stats.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer stats window UI forms.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/stats_16.tsx b/src/engine/forms/stats_16.tsx
index fafd52450..e648d7578 100644
--- a/src/engine/forms/stats_16.tsx
+++ b/src/engine/forms/stats_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of multiplayer stats window UI forms for 16/9.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/strelok_progress.tsx b/src/engine/forms/strelok_progress.tsx
index bf1eb0a3e..ee7d80860 100644
--- a/src/engine/forms/strelok_progress.tsx
+++ b/src/engine/forms/strelok_progress.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of strelok progress UI forms for quest.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/talk.tsx b/src/engine/forms/talk.tsx
index 8284c2929..cdb3ea9ff 100644
--- a/src/engine/forms/talk.tsx
+++ b/src/engine/forms/talk.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms for talking.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/talk_16.tsx b/src/engine/forms/talk_16.tsx
index 15d563d0b..5f72df83c 100644
--- a/src/engine/forms/talk_16.tsx
+++ b/src/engine/forms/talk_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms for talking (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/talk_character.tsx b/src/engine/forms/talk_character.tsx
index d5e6db035..adac664e3 100644
--- a/src/engine/forms/talk_character.tsx
+++ b/src/engine/forms/talk_character.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms related to character in talk menu.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/talk_character_16.tsx b/src/engine/forms/talk_character_16.tsx
index 3cc1962fe..bd2a2a08a 100644
--- a/src/engine/forms/talk_character_16.tsx
+++ b/src/engine/forms/talk_character_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms related to character in talk menu (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_credits.tsx b/src/engine/forms/ui_credits.tsx
index d69206b40..cb5690a4c 100644
--- a/src/engine/forms/ui_credits.tsx
+++ b/src/engine/forms/ui_credits.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { MenuCredits } from "@/engine/forms/menu/MenuCredits";
 
 /**
- * todo;
+ * Generation of UI forms related to game credits.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_credits_16.tsx b/src/engine/forms/ui_credits_16.tsx
index c2c7e446c..fe29f373b 100644
--- a/src/engine/forms/ui_credits_16.tsx
+++ b/src/engine/forms/ui_credits_16.tsx
@@ -3,7 +3,7 @@ import { JSXNode, JSXXML } from "jsx-xml";
 import { MenuCredits } from "@/engine/forms/menu/MenuCredits";
 
 /**
- * todo;
+ * Generation of UI forms related to game credits (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_custom_msgs.tsx b/src/engine/forms/ui_custom_msgs.tsx
index 24fa53c24..e41e149b1 100644
--- a/src/engine/forms/ui_custom_msgs.tsx
+++ b/src/engine/forms/ui_custom_msgs.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms related to custom messages in game.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_detector_artefact.tsx b/src/engine/forms/ui_detector_artefact.tsx
index 2f6267c28..0e0138ef7 100644
--- a/src/engine/forms/ui_detector_artefact.tsx
+++ b/src/engine/forms/ui_detector_artefact.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of ui forms related to detector artefact display.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_game_ahunt.tsx b/src/engine/forms/ui_game_ahunt.tsx
index 5bb0f4575..bd1b89eeb 100644
--- a/src/engine/forms/ui_game_ahunt.tsx
+++ b/src/engine/forms/ui_game_ahunt.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms related to artefact hunt mode in multiplayer.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_game_ahunt_16.tsx b/src/engine/forms/ui_game_ahunt_16.tsx
index 707204da2..5110d6803 100644
--- a/src/engine/forms/ui_game_ahunt_16.tsx
+++ b/src/engine/forms/ui_game_ahunt_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Generation of UI forms related to artefact hunt mode in multiplayer (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_mapinfo.tsx b/src/engine/forms/ui_mapinfo.tsx
index a82bb610d..de8a8790f 100644
--- a/src/engine/forms/ui_mapinfo.tsx
+++ b/src/engine/forms/ui_mapinfo.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of generic UI forms related to map information labels.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_mm_versions_dlg.tsx b/src/engine/forms/ui_mm_versions_dlg.tsx
index 82563c99d..70f24ac1d 100644
--- a/src/engine/forms/ui_mm_versions_dlg.tsx
+++ b/src/engine/forms/ui_mm_versions_dlg.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of ui components related to main menu versions dialog.
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/forms/ui_mm_versions_dlg_16.tsx b/src/engine/forms/ui_mm_versions_dlg_16.tsx
index 4d2759bad..d921f6f37 100644
--- a/src/engine/forms/ui_mm_versions_dlg_16.tsx
+++ b/src/engine/forms/ui_mm_versions_dlg_16.tsx
@@ -1,7 +1,7 @@
 import { JSXNode, JSXXML } from "jsx-xml";
 
 /**
- * todo;
+ * Creation of ui components related to main menu versions dialog (16/9).
  */
 export function create(): JSXNode {
   return (
diff --git a/src/engine/lib/constants/fonts.ts b/src/engine/lib/constants/fonts.ts
index 5844db168..56008c7cd 100644
--- a/src/engine/lib/constants/fonts.ts
+++ b/src/engine/lib/constants/fonts.ts
@@ -1,7 +1,7 @@
 /* eslint sort-keys-fix/sort-keys-fix: "error" */
 
 /**
- * todo;
+ * Declaration of fonts available for in-game usage.
  */
 export const fonts = {
   graffiti19: "graffiti19",
@@ -12,11 +12,11 @@ export const fonts = {
 } as const;
 
 /**
- * todo;
+ * Definition of all possible font config.
  */
 export type TFonts = typeof fonts;
 
 /**
- * todo;
+ * Signgle possible font type definition.
  */
 export type TFontId = keyof TFonts;
diff --git a/src/engine/lib/constants/game_difficulties.ts b/src/engine/lib/constants/game_difficulties.ts
index 3cb262054..e9196e474 100644
--- a/src/engine/lib/constants/game_difficulties.ts
+++ b/src/engine/lib/constants/game_difficulties.ts
@@ -1,7 +1,7 @@
 /* eslint sort-keys-fix/sort-keys-fix: "error" */
 
 /**
- * todo;
+ * List of possible game difficulties.
  */
 export const gameDifficulties = {
   gd_master: "gd_master",
@@ -11,12 +11,12 @@ export const gameDifficulties = {
 } as const;
 
 /**
- * todo;
+ * Definition of all difficulties' config.
  */
 export type TGameDifficulties = typeof gameDifficulties;
 
 /**
- * todo;
+ * Possible game difficulty type definition.
  */
 export type TGameDifficulty = TGameDifficulties[keyof TGameDifficulties];
 
diff --git a/src/engine/scripts/declarations/callbacks/actor.ts b/src/engine/scripts/declarations/callbacks/actor.ts
index 01875d213..8364e44b9 100644
--- a/src/engine/scripts/declarations/callbacks/actor.ts
+++ b/src/engine/scripts/declarations/callbacks/actor.ts
@@ -8,7 +8,7 @@ const logger: LuaLogger = new LuaLogger($filename);
 logger.info("Resolve and bind actor externals");
 
 /**
- * todo;
+ * Handle actor critical power levels.
  */
 extern("on_actor_critical_power", () => {
   logger.info("Actor critical power");
@@ -64,43 +64,43 @@ extern("on_actor_psy", () => {
 });
 
 /**
- * todo;
+ * Handle zone traveling with different set of callbacks.
  */
 extern("travel_callbacks", {
   initializeTravellerDialog: (dialog: PhraseDialog) => TravelManager.getInstance().initializeTravellerDialog(dialog),
-  canStartTravelingDialogs: (actor: ClientObject, npc: ClientObject) =>
-    TravelManager.getInstance().canStartTravelingDialogs(actor, npc),
-  getSquadCurrentActionDescription: (actor: ClientObject, npc: ClientObject): TLabel =>
-    TravelManager.getInstance().getSquadCurrentActionDescription(actor, npc),
-  canActorMoveWithSquad: (actor: ClientObject, npc: ClientObject): boolean =>
-    TravelManager.getInstance().canActorMoveWithSquad(actor, npc),
-  canSquadTakeActor: (actor: ClientObject, npc: ClientObject) =>
-    TravelManager.getInstance().canSquadTakeActor(actor, npc),
-  cannotSquadTakeActor: (npc: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().cannotSquadTakeActor(npc, actor, dialogId, phraseId),
-  onTravelTogetherWithSquad: (npc: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().onTravelTogetherWithSquad(npc, actor, dialogId, phraseId),
+  canStartTravelingDialogs: (actor: ClientObject, object: ClientObject) =>
+    TravelManager.getInstance().canStartTravelingDialogs(actor, object),
+  getSquadCurrentActionDescription: (actor: ClientObject, object: ClientObject): TLabel =>
+    TravelManager.getInstance().getSquadCurrentActionDescription(actor, object),
+  canActorMoveWithSquad: (actor: ClientObject, object: ClientObject): boolean =>
+    TravelManager.getInstance().canActorMoveWithSquad(actor, object),
+  canSquadTakeActor: (actor: ClientObject, object: ClientObject) =>
+    TravelManager.getInstance().canSquadTakeActor(actor, object),
+  cannotSquadTakeActor: (object: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().cannotSquadTakeActor(object, actor, dialogId, phraseId),
+  onTravelTogetherWithSquad: (object: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().onTravelTogetherWithSquad(object, actor, dialogId, phraseId),
   onTravelToSpecificSmartWithSquad: (
     actor: ClientObject,
-    npc: ClientObject,
+    object: ClientObject,
     dialogId: TStringId,
     phraseId: TStringId
-  ) => TravelManager.getInstance().onTravelToSpecificSmartWithSquad(actor, npc, dialogId, phraseId),
-  canSquadTravel: (npc: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().canSquadTravel(npc, actor, dialogId, phraseId),
+  ) => TravelManager.getInstance().onTravelToSpecificSmartWithSquad(actor, object, dialogId, phraseId),
+  canSquadTravel: (object: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().canSquadTravel(object, actor, dialogId, phraseId),
   canNegotiateTravelToSmart: (
     actor: ClientObject,
-    npc: ClientObject,
+    object: ClientObject,
     dialogId: TStringId,
     prevPhraseId: TStringId,
     phraseId: TStringId
-  ) => TravelManager.getInstance().canNegotiateTravelToSmart(actor, npc, dialogId, prevPhraseId, phraseId),
-  getTravelConst: (actor: ClientObject, npc: ClientObject, dialogId: TStringId, phraseId: TStringId): TLabel =>
-    TravelManager.getInstance().getTravelConst(actor, npc, dialogId, phraseId),
-  isEnoughMoneyToTravel: (actor: ClientObject, npc: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().isEnoughMoneyToTravel(actor, npc, dialogId, phraseId),
-  isNotEnoughMoneyToTravel: (actor: ClientObject, npc: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().isNotEnoughMoneyToTravel(actor, npc, dialogId, phraseId),
-  cannotSquadTravel: (npc: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
-    TravelManager.getInstance().cannotSquadTravel(npc, actor, dialogId, phraseId),
+  ) => TravelManager.getInstance().canNegotiateTravelToSmart(actor, object, dialogId, prevPhraseId, phraseId),
+  getTravelConst: (actor: ClientObject, object: ClientObject, dialogId: TStringId, phraseId: TStringId): TLabel =>
+    TravelManager.getInstance().getTravelConst(actor, object, dialogId, phraseId),
+  isEnoughMoneyToTravel: (actor: ClientObject, object: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().isEnoughMoneyToTravel(actor, object, dialogId, phraseId),
+  isNotEnoughMoneyToTravel: (actor: ClientObject, object: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().isNotEnoughMoneyToTravel(actor, object, dialogId, phraseId),
+  cannotSquadTravel: (object: ClientObject, actor: ClientObject, dialogId: TStringId, phraseId: TStringId) =>
+    TravelManager.getInstance().cannotSquadTravel(object, actor, dialogId, phraseId),
 });
diff --git a/src/engine/scripts/declarations/callbacks/custom.ts b/src/engine/scripts/declarations/callbacks/custom.ts
index ecb555820..ab9dacb9b 100644
--- a/src/engine/scripts/declarations/callbacks/custom.ts
+++ b/src/engine/scripts/declarations/callbacks/custom.ts
@@ -43,27 +43,33 @@ extern("engine.surge_survive_start", () => SurgeManager.getInstance().onSurgeSur
 extern("engine.surge_survive_end", () => SurgeManager.getInstance().onSurgeSurviveEnd());
 
 /**
- * todo;
+ * Check whether task with provided ID is completed.
  */
 extern("engine.is_task_completed", (taskId: TStringId): boolean => TaskManager.getInstance().isTaskCompleted(taskId));
 
 /**
- * todo;
+ * Check whether task with provided ID is failed.
  */
 extern("engine.is_task_failed", (taskId: TStringId): boolean => TaskManager.getInstance().isTaskFailed(taskId));
 
 /**
- * todo;
+ * Callback of game effector.
+ * When some camera effects from cutscene ends, handle it in scheme.
+ *
+ * todo: rename to camera_effector_callback?
  */
 extern("engine.effector_callback", () => SchemeCutscene.onCutsceneEnd());
 
 /**
  * Checkers for achievements called from C++.
+ * Creates set of callbacks in generic way.
  */
 extern(
   "engine.check_achievement",
   Object.values(EAchievement).reduce<PartialRecord<EAchievement, AnyCallable>>((acc, it) => {
-    acc[it] = () => AchievementsManager.getInstance().checkAchieved(it);
+    const manager: AchievementsManager = AchievementsManager.getInstance();
+
+    acc[it] = () => manager.checkAchieved(it);
 
     return acc;
   }, {})
diff --git a/src/engine/scripts/declarations/callbacks/game.ts b/src/engine/scripts/declarations/callbacks/game.ts
index 9e04ff6b7..8fb25471e 100644
--- a/src/engine/scripts/declarations/callbacks/game.ts
+++ b/src/engine/scripts/declarations/callbacks/game.ts
@@ -1,6 +1,3 @@
-/**
- * Outro conditions for game ending based on alife information.
- */
 import { SaveManager } from "@/engine/core/managers/base/SaveManager";
 import { TradeManager } from "@/engine/core/managers/interaction/TradeManager";
 import { smartCoversList } from "@/engine/core/objects/animation/smart_covers";
@@ -13,13 +10,16 @@ const logger: LuaLogger = new LuaLogger($filename);
 
 logger.info("Resolve and bind game externals");
 
-// todo: Check if needed.
+/**
+ * Declare list of available smart covers for game engine.
+ * Xray uses it internally.
+ */
 extern("smart_covers", {
   descriptions: smartCoversList,
 });
 
 /**
- * todo;
+ * Module of callbacks related to game outro.
  */
 extern("outro", {
   conditions: GameOutroManager.OUTRO_CONDITIONS,
@@ -30,7 +30,8 @@ extern("outro", {
 });
 
 /**
- * todo;
+ * Trading callbacks module.
+ * Adjust pricing / trading from lua.
  */
 extern("trade_manager", {
   get_sell_discount: (objectId: TNumberId) => TradeManager.getInstance().getSellDiscountForObject(objectId),
diff --git a/src/engine/scripts/declarations/callbacks/interface.ts b/src/engine/scripts/declarations/callbacks/interface.ts
index a838aebf7..8d2202ac0 100644
--- a/src/engine/scripts/declarations/callbacks/interface.ts
+++ b/src/engine/scripts/declarations/callbacks/interface.ts
@@ -32,7 +32,7 @@ extern("loadscreen", {
 });
 
 /**
- * todo;
+ * Handle item upgrade callbacks from game engine.
  */
 extern("inventory_upgrades", {
   get_upgrade_cost: (section: TSection): TLabel => ItemUpgradesManager.getInstance().getUpgradeCost(section),
@@ -59,7 +59,7 @@ extern("inventory_upgrades", {
 });
 
 /**
- * todo;
+ * Handle actor menu modes switching (pda, map, inventory).
  */
 extern("actor_menu", {
   actor_menu_mode: (mode: EActorMenuMode): void => {
@@ -68,9 +68,18 @@ extern("actor_menu", {
 });
 
 /**
- * todo;
+ * Handle actor menu callbacks.
  */
 extern("actor_menu_inventory", {
+  /**
+   * Handle drag and drop event in inventory.
+   *
+   * @param from - from object in inventory dropped
+   * @param to - to object in inventory dropped
+   * @param oldList - old menu type
+   * @param newList - new menu type
+   * @returns whether drag drop was handled
+   */
   CUIActorMenu_OnItemDropped: (
     from: ClientObject,
     to: ClientObject,