diff --git a/packages/dds/matrix/src/matrix.ts b/packages/dds/matrix/src/matrix.ts
index 2dc38960aa79..052a6d1a85c0 100644
--- a/packages/dds/matrix/src/matrix.ts
+++ b/packages/dds/matrix/src/matrix.ts
@@ -17,7 +17,6 @@ import {
 } from "@fluidframework/datastore-definitions/internal";
 import { ISequencedDocumentMessage } from "@fluidframework/driver-definitions/internal";
 import {
-	// eslint-disable-next-line import/no-deprecated
 	Client,
 	IJSONSegment,
 	IMergeTreeOp,
@@ -25,8 +24,6 @@ import {
 	type LocalReferencePosition,
 	MergeTreeDeltaType,
 	ReferenceType,
-	// eslint-disable-next-line import/no-deprecated
-	SegmentGroup,
 	segmentIsRemoved,
 } from "@fluidframework/merge-tree/internal";
 import { ISummaryTreeWithStats } from "@fluidframework/runtime-definitions/internal";
@@ -755,7 +752,6 @@ export class SharedMatrix<T = any>
 	}
 
 	private rebasePosition(
-		// eslint-disable-next-line import/no-deprecated
 		client: Client,
 		ref: LocalReferencePosition,
 		localSeq: number,
@@ -813,23 +809,11 @@ export class SharedMatrix<T = any>
 		} else {
 			switch (content.target) {
 				case SnapshotPath.cols: {
-					this.submitColMessage(
-						this.cols.regeneratePendingOp(
-							content,
-							// eslint-disable-next-line import/no-deprecated
-							localOpMetadata as SegmentGroup | SegmentGroup[],
-						),
-					);
+					this.submitColMessage(this.cols.regeneratePendingOp(content, localOpMetadata));
 					break;
 				}
 				case SnapshotPath.rows: {
-					this.submitRowMessage(
-						this.rows.regeneratePendingOp(
-							content,
-							// eslint-disable-next-line import/no-deprecated
-							localOpMetadata as SegmentGroup | SegmentGroup[],
-						),
-					);
+					this.submitRowMessage(this.rows.regeneratePendingOp(content, localOpMetadata));
 					break;
 				}
 				default: {
diff --git a/packages/dds/matrix/src/permutationvector.ts b/packages/dds/matrix/src/permutationvector.ts
index 3bfb592f5176..aae2aaa5e924 100644
--- a/packages/dds/matrix/src/permutationvector.ts
+++ b/packages/dds/matrix/src/permutationvector.ts
@@ -11,7 +11,7 @@ import {
 } from "@fluidframework/datastore-definitions/internal";
 import { ISequencedDocumentMessage } from "@fluidframework/driver-definitions/internal";
 import {
-	BaseSegment, // eslint-disable-next-line import/no-deprecated
+	BaseSegment,
 	Client,
 	IJSONSegment,
 	IMergeTreeDeltaCallbackArgs,
diff --git a/packages/dds/merge-tree/src/client.ts b/packages/dds/merge-tree/src/client.ts
index c773bb13942c..a5f139c8391e 100644
--- a/packages/dds/merge-tree/src/client.ts
+++ b/packages/dds/merge-tree/src/client.ts
@@ -192,12 +192,7 @@ export class Client extends TypedEventEmitter<IClientEvents> {
 	 * @param count - The number segment groups to get peek from the tail of the queue. Default 1.
 	 */
 
-	public peekPendingSegmentGroups(): SegmentGroup | undefined;
-
-	public peekPendingSegmentGroups(count: number): SegmentGroup | SegmentGroup[] | undefined;
-	public peekPendingSegmentGroups(
-		count: number = 1,
-	): SegmentGroup | SegmentGroup[] | undefined {
+	public peekPendingSegmentGroups(count: number = 1): unknown {
 		const pending = this._mergeTree.pendingSegments;
 		let node = pending?.last;
 		if (count === 1 || pending === undefined) {
@@ -876,7 +871,7 @@ export class Client extends TypedEventEmitter<IClientEvents> {
 	private resetPendingDeltaToOps(
 		resetOp: IMergeTreeDeltaOp,
 
-		segmentGroup: SegmentGroup<ISegmentPrivate>,
+		segmentGroup: SegmentGroup,
 	): IMergeTreeDeltaOp[] {
 		assert(!!segmentGroup, 0x033 /* "Segment group undefined" */);
 		const NACKedSegmentGroup = this.pendingRebase?.shift()?.data;
@@ -1193,11 +1188,8 @@ export class Client extends TypedEventEmitter<IClientEvents> {
 	 * @param resetOp - The op to reset
 	 * @param segmentGroup - The segment group associated with the op
 	 */
-	public regeneratePendingOp(
-		resetOp: IMergeTreeOp,
-
-		segmentGroup: SegmentGroup | SegmentGroup[],
-	): IMergeTreeOp {
+	public regeneratePendingOp(resetOp: IMergeTreeOp, localOpMetadata: unknown): IMergeTreeOp {
+		const segmentGroup = localOpMetadata as SegmentGroup | SegmentGroup[];
 		if (this.pendingRebase === undefined || this.pendingRebase.empty) {
 			let firstGroup: SegmentGroup;
 			if (Array.isArray(segmentGroup)) {
diff --git a/packages/dds/merge-tree/src/index.ts b/packages/dds/merge-tree/src/index.ts
index a5d3cb182cb3..35f1d761dd12 100644
--- a/packages/dds/merge-tree/src/index.ts
+++ b/packages/dds/merge-tree/src/index.ts
@@ -58,7 +58,6 @@ export {
 export {
 	BaseSegment,
 	CollaborationWindow,
-	debugMarkerToString,
 	IJSONMarkerSegment,
 	IMergeNodeCommon,
 	segmentIsRemoved,
@@ -67,8 +66,6 @@ export {
 	Marker,
 	reservedMarkerIdKey,
 	reservedMarkerSimpleTypeKey,
-	SegmentGroup,
-	ObliterateInfo,
 	ISegmentInternal,
 } from "./mergeTreeNodes.js";
 export {
diff --git a/packages/dds/merge-tree/src/mergeTree.ts b/packages/dds/merge-tree/src/mergeTree.ts
index b50949ee5bca..37bea60256f6 100644
--- a/packages/dds/merge-tree/src/mergeTree.ts
+++ b/packages/dds/merge-tree/src/mergeTree.ts
@@ -2400,7 +2400,7 @@ export class MergeTree {
 				throw new Error("Rollback op doesn't match last edit");
 			}
 			let i = 0;
-			for (const segment of pendingSegmentGroup.segments as ISegmentPrivate[]) {
+			for (const segment of pendingSegmentGroup.segments) {
 				const segmentSegmentGroup = segment?.segmentGroups?.pop?.();
 				assert(
 					segmentSegmentGroup === pendingSegmentGroup,
diff --git a/packages/dds/merge-tree/src/mergeTreeNodes.ts b/packages/dds/merge-tree/src/mergeTreeNodes.ts
index 37bc02180c1f..487f2d321dc4 100644
--- a/packages/dds/merge-tree/src/mergeTreeNodes.ts
+++ b/packages/dds/merge-tree/src/mergeTreeNodes.ts
@@ -19,11 +19,7 @@ import { IJSONSegment, IMarkerDef, ReferenceType } from "./ops.js";
 import { computeHierarchicalOrdinal } from "./ordinal.js";
 import type { PartialSequenceLengths } from "./partialLengths.js";
 import { PropertySet, clone, createMap, type MapLike } from "./properties.js";
-import {
-	ReferencePosition,
-	refGetTileLabels,
-	refTypeIncludesFlag,
-} from "./referencePositions.js";
+import { ReferencePosition } from "./referencePositions.js";
 import { SegmentGroupCollection } from "./segmentGroupCollection.js";
 import {
 	isInserted,
@@ -273,14 +269,6 @@ export function segmentIsRemoved(segment: ISegment): boolean {
 	return leaf.removedSeq !== undefined;
 }
 
-/**
- * @internal
- */
-export interface IMarkerModifiedAction {
-	// eslint-disable-next-line @typescript-eslint/prefer-function-type
-	(marker: Marker): void;
-}
-
 /**
  * @legacy
  * @alpha
@@ -297,16 +285,10 @@ export interface ISegmentAction<TClientData> {
 		accum: TClientData,
 	): boolean;
 }
-/**
- * @internal
- */
 export interface ISegmentChanges {
-	next?: ISegmentInternal;
-	replaceCurrent?: ISegmentInternal;
+	next?: ISegmentPrivate;
+	replaceCurrent?: ISegmentPrivate;
 }
-/**
- * @internal
- */
 export interface BlockAction<TClientData> {
 	// eslint-disable-next-line @typescript-eslint/prefer-function-type
 	(
@@ -320,49 +302,16 @@ export interface BlockAction<TClientData> {
 	): boolean;
 }
 
-/**
- * @internal
- */
-export interface NodeAction<TClientData> {
-	// eslint-disable-next-line @typescript-eslint/prefer-function-type
-	(
-		node: IMergeNode,
-		pos: number,
-		refSeq: number,
-		clientId: number,
-		start: number | undefined,
-		end: number | undefined,
-		clientData: TClientData,
-	): boolean;
-}
-
-/**
- * @internal
- */
 export interface InsertContext {
-	candidateSegment?: ISegmentInternal;
+	candidateSegment?: ISegmentPrivate;
 	leaf: (
-		segment: ISegmentInternal | undefined,
+		segment: ISegmentPrivate | undefined,
 		pos: number,
 		ic: InsertContext,
 	) => ISegmentChanges;
 	continuePredicate?: (continueFromBlock: MergeBlock) => boolean;
 }
 
-/**
- * @internal
- */
-export interface SegmentActions<TClientData> {
-	leaf?: ISegmentAction<TClientData>;
-	shift?: NodeAction<TClientData>;
-	contains?: NodeAction<TClientData>;
-	pre?: BlockAction<TClientData>;
-	post?: BlockAction<TClientData>;
-}
-
-/**
- * @internal
- */
 export interface ObliterateInfo {
 	start: LocalReferencePosition;
 	end: LocalReferencePosition;
@@ -373,11 +322,8 @@ export interface ObliterateInfo {
 	segmentGroup: SegmentGroup | undefined;
 }
 
-/**
- * @internal
- */
-export interface SegmentGroup<S extends ISegmentInternal = ISegmentInternal> {
-	segments: S[];
+export interface SegmentGroup {
+	segments: ISegmentPrivate[];
 	previousProps?: PropertySet[];
 	localSeq?: number;
 	refSeq: number;
@@ -389,12 +335,8 @@ export interface SegmentGroup<S extends ISegmentInternal = ISegmentInternal> {
  * the MergeTree always inserts first, then checks for overflow and splits if the child count equals
  * `MaxNodesInBlock`.  (i.e., `MaxNodesInBlock` contains 1 extra slot for temporary storage to
  * facilitate splits.)
- * @internal
  */
 export const MaxNodesInBlock = 8;
-/**
- * @internal
- */
 export class MergeBlock implements IMergeNodeCommon {
 	public children: IMergeNode[];
 	public needsScour?: boolean;
@@ -873,47 +815,3 @@ export const compareNumbers = (a: number, b: number): number => a - b;
  * Compares two strings.
  */
 export const compareStrings = (a: string, b: string): number => a.localeCompare(b);
-
-/**
- * Get a human-readable string for a given {@link Marker}.
- *
- * @remarks This function is intended for debugging only. The exact format of
- * this string should not be relied upon between versions.
- * @internal
- */
-export function debugMarkerToString(marker: Marker): string {
-	let bbuf = "";
-	if (refTypeIncludesFlag(marker, ReferenceType.Tile)) {
-		bbuf += "Tile";
-	}
-	let lbuf = "";
-	const id = marker.getId();
-	if (id) {
-		bbuf += ` (${id}) `;
-	}
-	const tileLabels = refGetTileLabels(marker);
-	if (tileLabels) {
-		lbuf += "tile -- ";
-		for (let i = 0, len = tileLabels.length; i < len; i++) {
-			const tileLabel = tileLabels[i];
-			if (i > 0) {
-				lbuf += "; ";
-			}
-			lbuf += tileLabel;
-		}
-	}
-
-	let pbuf = "";
-	if (marker.properties) {
-		pbuf += JSON.stringify(marker.properties, (key, value) => {
-			// Avoid circular reference when stringifying makers containing handles.
-			// (Substitute a debug string instead.)
-			// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, @typescript-eslint/no-unsafe-member-access
-			const handle = !!value && value.IFluidHandle;
-
-			// eslint-disable-next-line @typescript-eslint/no-unsafe-return, @typescript-eslint/no-unsafe-member-access
-			return handle ? `#Handle(${handle.routeContext.path}/${handle.path})` : value;
-		});
-	}
-	return `M ${bbuf}: ${lbuf} ${pbuf}`;
-}
diff --git a/packages/dds/merge-tree/src/segmentGroupCollection.ts b/packages/dds/merge-tree/src/segmentGroupCollection.ts
index 3ce4354901b3..665e06672c07 100644
--- a/packages/dds/merge-tree/src/segmentGroupCollection.ts
+++ b/packages/dds/merge-tree/src/segmentGroupCollection.ts
@@ -7,10 +7,10 @@ import { DoublyLinkedList, walkList } from "./collections/index.js";
 import { SegmentGroup, type ISegmentPrivate } from "./mergeTreeNodes.js";
 
 export class SegmentGroupCollection {
-	private readonly segmentGroups: DoublyLinkedList<SegmentGroup<ISegmentPrivate>>;
+	private readonly segmentGroups: DoublyLinkedList<SegmentGroup>;
 
 	constructor(private readonly segment: ISegmentPrivate) {
-		this.segmentGroups = new DoublyLinkedList<SegmentGroup<ISegmentPrivate>>();
+		this.segmentGroups = new DoublyLinkedList<SegmentGroup>();
 	}
 
 	public get size(): number {
@@ -21,16 +21,16 @@ export class SegmentGroupCollection {
 		return this.segmentGroups.empty;
 	}
 
-	public enqueue(segmentGroup: SegmentGroup<ISegmentPrivate>): void {
+	public enqueue(segmentGroup: SegmentGroup): void {
 		this.segmentGroups.push(segmentGroup);
 		segmentGroup.segments.push(this.segment);
 	}
 
-	public dequeue(): SegmentGroup<ISegmentPrivate> | undefined {
+	public dequeue(): SegmentGroup | undefined {
 		return this.segmentGroups.shift()?.data;
 	}
 
-	public remove?(segmentGroup: SegmentGroup<ISegmentPrivate>): boolean {
+	public remove?(segmentGroup: SegmentGroup): boolean {
 		const found = this.segmentGroups.find((v) => v.data === segmentGroup);
 		if (found === undefined) {
 			return false;
@@ -39,7 +39,7 @@ export class SegmentGroupCollection {
 		return true;
 	}
 
-	public pop?(): SegmentGroup<ISegmentPrivate> | undefined {
+	public pop?(): SegmentGroup | undefined {
 		return this.segmentGroups.pop ? this.segmentGroups.pop()?.data : undefined;
 	}
 
@@ -47,10 +47,7 @@ export class SegmentGroupCollection {
 		walkList(this.segmentGroups, (sg) => segmentGroups.enqueueOnCopy(sg.data, this.segment));
 	}
 
-	private enqueueOnCopy(
-		segmentGroup: SegmentGroup<ISegmentPrivate>,
-		sourceSegment: ISegmentPrivate,
-	): void {
+	private enqueueOnCopy(segmentGroup: SegmentGroup, sourceSegment: ISegmentPrivate): void {
 		this.enqueue(segmentGroup);
 		if (segmentGroup.previousProps) {
 			// duplicate the previousProps for this segment
diff --git a/packages/dds/merge-tree/src/test/index.ts b/packages/dds/merge-tree/src/test/index.ts
index c61b166cdc46..c0c7afabc1da 100644
--- a/packages/dds/merge-tree/src/test/index.ts
+++ b/packages/dds/merge-tree/src/test/index.ts
@@ -62,7 +62,6 @@ export {
 	createInsertSegmentOp,
 	createMap,
 	createRemoveRangeOp,
-	debugMarkerToString,
 	DetachedReferencePosition,
 	discardMergeTreeDeltaRevertible,
 	IJSONMarkerSegment,
@@ -119,7 +118,6 @@ export {
 	reservedMarkerSimpleTypeKey,
 	reservedTileLabelsKey,
 	revertMergeTreeDeltaRevertibles,
-	SegmentGroup,
 	SortedSegmentSet,
 	SortedSegmentSetItem,
 	SortedSet,
diff --git a/packages/dds/merge-tree/src/test/reconnectHelper.ts b/packages/dds/merge-tree/src/test/reconnectHelper.ts
index 5ccefec3786d..dd130c4fff99 100644
--- a/packages/dds/merge-tree/src/test/reconnectHelper.ts
+++ b/packages/dds/merge-tree/src/test/reconnectHelper.ts
@@ -8,12 +8,12 @@ import { strict as assert } from "node:assert";
 import { ISequencedDocumentMessage } from "@fluidframework/driver-definitions/internal";
 
 import {
-	SegmentGroup,
 	endpointPosAndSide,
 	type IMergeTreeOptions,
 	type InteriorSequencePlace,
 	type SequencePlace,
 } from "../index.js";
+import type { SegmentGroup } from "../mergeTreeNodes.js";
 import {
 	IMergeTreeDeltaOp,
 	type IMergeTreeInsertMsg,
diff --git a/packages/dds/merge-tree/src/test/testClient.ts b/packages/dds/merge-tree/src/test/testClient.ts
index 70224d034e6a..fbf33f8eafc8 100644
--- a/packages/dds/merge-tree/src/test/testClient.ts
+++ b/packages/dds/merge-tree/src/test/testClient.ts
@@ -29,7 +29,13 @@ import {
 	forwardExcursion,
 	walkAllChildSegments,
 } from "../mergeTreeNodeWalk.js";
-import { MergeBlock, ISegmentPrivate, Marker, MaxNodesInBlock } from "../mergeTreeNodes.js";
+import {
+	MergeBlock,
+	ISegmentPrivate,
+	Marker,
+	MaxNodesInBlock,
+	type SegmentGroup,
+} from "../mergeTreeNodes.js";
 import {
 	createAnnotateRangeOp,
 	createInsertSegmentOp,
@@ -479,6 +485,15 @@ export class TestClient extends Client {
 		return seqs;
 	}
 
+	public peekPendingSegmentGroups(): SegmentGroup | undefined;
+	public peekPendingSegmentGroups(count: number): SegmentGroup | SegmentGroup[] | undefined;
+	public peekPendingSegmentGroups(
+		count: number = 1,
+	): SegmentGroup | SegmentGroup[] | undefined {
+		// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion
+		return super.peekPendingSegmentGroups(count) as SegmentGroup | SegmentGroup[] | undefined;
+	}
+
 	/**
 	 * Override and add some test only metrics
 	 */
diff --git a/packages/dds/sequence/src/sequence.ts b/packages/dds/sequence/src/sequence.ts
index 186f992d8b7c..8d6cad956d77 100644
--- a/packages/dds/sequence/src/sequence.ts
+++ b/packages/dds/sequence/src/sequence.ts
@@ -16,7 +16,6 @@ import {
 	ISequencedDocumentMessage,
 } from "@fluidframework/driver-definitions/internal";
 import {
-	// eslint-disable-next-line import/no-deprecated
 	Client,
 	IJSONSegment,
 	IMergeTreeAnnotateMsg,
@@ -36,8 +35,6 @@ import {
 	PropertySet,
 	ReferencePosition,
 	ReferenceType,
-	// eslint-disable-next-line import/no-deprecated
-	SegmentGroup,
 	SlidingPreference,
 	createAnnotateRangeOp,
 	// eslint-disable-next-line import/no-deprecated
@@ -504,7 +501,6 @@ export abstract class SharedSegmentSequence<T extends ISegment>
 		return this.ongoingResubmitRefSeq ?? this.deltaManager.lastSequenceNumber;
 	}
 
-	// eslint-disable-next-line import/no-deprecated
 	protected client: Client;
 	private messagesSinceMSNChange: ISequencedDocumentMessage[] = [];
 	private readonly intervalCollections: IntervalCollectionMap<SequenceInterval>;
@@ -543,7 +539,6 @@ export abstract class SharedSegmentSequence<T extends ISegment>
 			dataStoreRuntime.options,
 		);
 
-		// eslint-disable-next-line import/no-deprecated
 		this.client = new Client(
 			segmentFromSpec,
 			createChildLogger({
@@ -812,11 +807,7 @@ export abstract class SharedSegmentSequence<T extends ISegment>
 				)
 			) {
 				this.submitSequenceMessage(
-					this.client.regeneratePendingOp(
-						content as IMergeTreeOp,
-						// eslint-disable-next-line import/no-deprecated
-						localOpMetadata as SegmentGroup | SegmentGroup[],
-					),
+					this.client.regeneratePendingOp(content as IMergeTreeOp, localOpMetadata),
 				);
 			}
 		});