@@ -0,0 +1,66 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#25467 cut 24] The live metadata-type listing of
+ * `ObjectStackProtocolImplementation` (`listLiveMetadataTypes`), moved out
+ * of `protocol.ts` whole: the types the engine's SchemaRegistry holds, plus
+ * the types the `metadata` service reports, de-duplicated — the one answer to
+ * "which types exist here" that `getMetaTypes` and every other caller share.
+ *
+ * A MOVE, not a redesign. The function below is the body of the
+ * `ObjectStackProtocolImplementation` method of the same name as it stood,
+ * re-indented one level and otherwise unedited: the same two sources in the
+ * same order, the same tolerance of an absent `metadata` service, and the
+ * same de-duplication.
+ *
+ * ## How the moved body reaches the class
+ *
+ * The shape #23050 set for `rest-server.ts` (its `data-action-routes.ts`
+ * header carries the full reasoning), as `protocol-batch-data.ts` applies it.
+ * The class keeps the method — the published `dist/*.d.ts` lists its name,
+ * docblock and declared signature — and its body is one literal of exactly
+ * the {@link LiveMetadataTypesHost} members it reads, plus a `.call`. Both
+ * are handed over as getters, so the body reads the protocol's own `engine`
+ * and its constructor-supplied `getServicesRegistry` field at call time, as
+ * `protocol-metadata-service-read.ts` hands that field over. Every other
+ * reader of the method keeps calling the class method.
+ *
+ * The body reads none of `protocol.ts`'s module-level declarations and
+ * imports nothing but the class's type. Nothing re-exports this module, so
+ * the published surface does not move.
+ */
+
+import type { ObjectStackProtocolImplementation } from './protocol.js';
+
+/**
+ * The `ObjectStackProtocolImplementation` members the function below reads —
+ * every one of them, and no other; the function's `this` is the `Pick` of the
+ * members it reads. Each is typed AS the class member (an indexed access on
+ * the class), so a change to a member's signature on the class is a change
+ * here too, and naming a member the class does not have is a compile error.
+ */
+export interface LiveMetadataTypesHost {
+    readonly engine: ObjectStackProtocolImplementation['engine'];
+    readonly getServicesRegistry: ObjectStackProtocolImplementation['getServicesRegistry'];
+}
+
+/** The body of `ObjectStackProtocolImplementation#listLiveMetadataTypes`; the method's docblock there is its contract. */
+export async function listLiveMetadataTypes(
+    this: Pick<LiveMetadataTypesHost, 'engine' | 'getServicesRegistry'>,
+): Promise<string[]> {
+    const schemaTypes = this.engine.registry.getRegisteredTypes();
+
+    // Also include types from MetadataService (runtime-registered: agent, tool, etc.)
+    let runtimeTypes: string[] = [];
+    try {
+        const services = this.getServicesRegistry?.();
+        const metadataService = services?.get('metadata');
+        if (metadataService && typeof metadataService.getRegisteredTypes === 'function') {
+            runtimeTypes = await metadataService.getRegisteredTypes();
+        }
+    } catch {
+        // MetadataService not available
+    }
+
+    return Array.from(new Set([...schemaTypes, ...runtimeTypes]));
+}
@@ -0,0 +1,68 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#25467 cut 24] The save door's answer to an optimistic-save conflict, from
+ * `ObjectStackProtocolImplementation` (`saveConflict`), moved out of
+ * `protocol.ts` whole: the 409 for a `ConflictError` — the repository's race,
+ * or a caller's token the keyed comparison refused — built by the one
+ * conflict builder, plus its decision-audit row (#21207, #23406).
+ *
+ * A MOVE, not a redesign. The function below is the body of the
+ * `ObjectStackProtocolImplementation` method of the same name as it stood,
+ * re-indented one level and otherwise unedited: the same refusal text and
+ * first-write pin, the same audit row, in the same order.
+ *
+ * ## How the moved body reaches the class
+ *
+ * The shape #23050 set for `rest-server.ts` (its `data-action-routes.ts`
+ * header carries the full reasoning), as `protocol-batch-data.ts` applies it.
+ * The class keeps the method — the published `dist/*.d.ts` lists its name,
+ * docblock and declared signature — and its body is one literal of exactly
+ * the {@link SaveConflictHost} members it reads, each handed over as a
+ * closure, plus a `.call`. Every other reader of the method keeps calling
+ * the class method.
+ *
+ * What the body reads from elsewhere, it imports from where `protocol.ts`
+ * imported it. Nothing re-exports this module, so the published surface does
+ * not move.
+ */
+
+import type { ConflictError } from '@objectstack/metadata-core';
+import type { ObjectStackProtocolImplementation } from './protocol.js';
+
+/**
+ * The `ObjectStackProtocolImplementation` members the function below reads —
+ * every one of them, and no other; the function's `this` is the `Pick` of the
+ * members it reads. Each is typed AS the class member (an indexed access on
+ * the class), so a change to a member's signature on the class is a change
+ * here too, and naming a member the class does not have is a compile error.
+ */
+export interface SaveConflictHost {
+    readonly metadataConflictRefusal: ObjectStackProtocolImplementation['metadataConflictRefusal'];
+    readonly recordOptimisticConflictAudit: ObjectStackProtocolImplementation['recordOptimisticConflictAudit'];
+}
+
+/** The body of `ObjectStackProtocolImplementation#saveConflict`; the method's docblock there is its contract. */
+export async function saveConflict(
+    this: Pick<SaveConflictHost, 'metadataConflictRefusal' | 'recordOptimisticConflictAudit'>,
+    err: ConflictError,
+    request: { type: string; name: string; actor?: string; parentVersion?: string | null; mode?: 'draft' | 'publish' },
+    writeSource: string,
+): Promise<Error> {
+    const conflict = await this.metadataConflictRefusal(
+        err,
+        `${request.type}/${request.name}`,
+        `${request.type}/${request.name} has been modified since you loaded it.`,
+        request.parentVersion === null ? (request.mode === 'draft' ? 'draft' : 'active') : undefined,
+    );
+    await this.recordOptimisticConflictAudit({
+        type: request.type,
+        name: request.name,
+        operation: 'save',
+        ...(request.actor ? { actor: request.actor } : {}),
+        source: writeSource,
+        expectedParent: err.expectedParent,
+        actualHead: err.actualHead,
+    });
+    return conflict;
+}
@@ -413,6 +413,10 @@ import { reportSealedOverlayRows } from './protocol-sealed-overlay-report.js';
 import { expandUnderOwnName, resolveRowlessExpandedView } from './protocol-view-expansion-names.js';
 // [#25467 cut 23] The read-side conversion of a stored item: the ADR-0087 chain with its notices, and the warned-once read with the page `type` default.
 import { convertStoredItem, convertStoredItemDetailed } from './protocol-stored-item-conversion.js';
+// [#25467 cut 24] The live metadata-type listing: the SchemaRegistry's types and the `metadata` service's, de-duplicated.
+import { listLiveMetadataTypes } from './protocol-live-metadata-types.js';
+// [#25467 cut 24] The save door's 409 for a `ConflictError`, with its decision-audit row.
+import { saveConflict } from './protocol-save-conflict.js';
 
 /**
  * Canonical Zod schema per metadata type lives in
@@ -8492,21 +8496,14 @@ export class ObjectStackProtocolImplementation implements
      * One accessor, no second vocabulary.
      */
     private async listLiveMetadataTypes(): Promise<string[]> {
-        const schemaTypes = this.engine.registry.getRegisteredTypes();
-
-        // Also include types from MetadataService (runtime-registered: agent, tool, etc.)
-        let runtimeTypes: string[] = [];
-        try {
-            const services = this.getServicesRegistry?.();
-            const metadataService = services?.get('metadata');
-            if (metadataService && typeof metadataService.getRegisteredTypes === 'function') {
-                runtimeTypes = await metadataService.getRegisteredTypes();
-            }
-        } catch {
-            // MetadataService not available
-        }
-
-        return Array.from(new Set([...schemaTypes, ...runtimeTypes]));
+        // [#25467 cut 24] The body moved to `protocol-live-metadata-types.ts` (see `LiveMetadataTypesHost`).
+        const readEngine = () => this.engine;
+        const readGetServicesRegistry = () => this.getServicesRegistry;
+        const host: ThisParameterType<typeof listLiveMetadataTypes> = {
+            get engine() { return readEngine(); },
+            get getServicesRegistry() { return readGetServicesRegistry(); },
+        };
+        return listLiveMetadataTypes.call(host);
     }
 
     async getMetaTypes() {
@@ -21471,22 +21468,12 @@ export class ObjectStackProtocolImplementation implements
         request: { type: string; name: string; actor?: string; parentVersion?: string | null; mode?: 'draft' | 'publish' },
         writeSource: string,
     ): Promise<Error> {
-        const conflict = await this.metadataConflictRefusal(
-            err,
-            `${request.type}/${request.name}`,
-            `${request.type}/${request.name} has been modified since you loaded it.`,
-            request.parentVersion === null ? (request.mode === 'draft' ? 'draft' : 'active') : undefined,
-        );
-        await this.recordOptimisticConflictAudit({
-            type: request.type,
-            name: request.name,
-            operation: 'save',
-            ...(request.actor ? { actor: request.actor } : {}),
-            source: writeSource,
-            expectedParent: err.expectedParent,
-            actualHead: err.actualHead,
-        });
-        return conflict;
+        // [#25467 cut 24] The body moved to `protocol-save-conflict.ts` (see `SaveConflictHost`).
+        const host: ThisParameterType<typeof saveConflict> = {
+            metadataConflictRefusal: (...a) => this.metadataConflictRefusal(...a),
+            recordOptimisticConflictAudit: (...a) => this.recordOptimisticConflictAudit(...a),
+        };
+        return saveConflict.call(host, err, request, writeSource);
     }
 
     /**