diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index d5d82b12..f39d98e2 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - "json-document-v*-rc.*"
+      - "json-document-extensions-v*-rc.*"
 
 permissions:
   contents: read
@@ -30,7 +31,8 @@ jobs:
           node-version: "24"
           registry-url: "https://registry.npmjs.org"
           package-manager-cache: false
-      - name: Verify prerelease identity
+      - name: Verify core prerelease identity
+        if: startsWith(github.ref_name, 'json-document-v')
         env:
           RELEASE_TAG: ${{ github.ref_name }}
         run: |
@@ -48,7 +50,81 @@ jobs:
               throw new Error("publishConfig.tag must remain next for prereleases");
             }
           '
+      - name: Verify extension prerelease identity
+        if: startsWith(github.ref_name, 'json-document-extensions-v')
+        env:
+          RELEASE_TAG: ${{ github.ref_name }}
+        run: |
+          node --input-type=module --eval '
+            import { readFileSync } from "node:fs";
+            const packagePaths = [
+              "packages/grouping/package.json",
+              "packages/patch-preview/package.json",
+              "packages/search-replace/package.json",
+            ];
+            const expectedNames = [
+              "@interactive-os/json-document-grouping",
+              "@interactive-os/json-document-patch-preview",
+              "@interactive-os/json-document-search-replace",
+            ];
+            const packages = packagePaths.map((path) =>
+              JSON.parse(readFileSync(path, "utf8"))
+            );
+            const versions = new Set(packages.map((pkg) => pkg.version));
+            if (versions.size !== 1) {
+              throw new Error("extension prerelease versions must match");
+            }
+            const [version] = versions;
+            const expectedTag = `json-document-extensions-v${version}`;
+            if (process.env.RELEASE_TAG !== expectedTag) {
+              throw new Error(`release tag ${process.env.RELEASE_TAG} does not match ${expectedTag}`);
+            }
+            if (!/^\d+\.\d+\.\d+-rc\.\d+$/.test(version)) {
+              throw new Error(`extension version is not an rc prerelease: ${version}`);
+            }
+            for (const [index, pkg] of packages.entries()) {
+              if (pkg.name !== expectedNames[index]) {
+                throw new Error(`${packagePaths[index]} has unexpected name ${pkg.name}`);
+              }
+              if (pkg.publishConfig?.tag !== "next") {
+                throw new Error(`${pkg.name} publishConfig.tag must remain next`);
+              }
+              if (pkg.publishConfig?.access !== "public" || pkg.publishConfig?.provenance !== true) {
+                throw new Error(`${pkg.name} must publish publicly with provenance`);
+              }
+              if (pkg.peerDependencies?.["@interactive-os/json-document"] !== "^1.0.1 || ^1.1.0-rc.0") {
+                throw new Error(`${pkg.name} does not accept the core integration RC`);
+              }
+            }
+          '
       - name: Install dependencies
         run: npm ci --no-audit --no-fund
-      - name: Publish prerelease
+      - name: Verify extension prereleases
+        if: startsWith(github.ref_name, 'json-document-extensions-v')
+        run: |
+          version=$(node -p 'require("./packages/grouping/package.json").version')
+          for package in \
+            @interactive-os/json-document-grouping \
+            @interactive-os/json-document-patch-preview \
+            @interactive-os/json-document-search-replace
+          do
+            if npm view "$package@$version" version >/dev/null 2>&1; then
+              echo "::error::$package@$version is already published"
+              exit 1
+            fi
+            npm run verify -w "$package"
+            npm pack -w "$package" --dry-run --cache "${RUNNER_TEMP}/npm-cache"
+          done
+      - name: Publish core prerelease
+        if: startsWith(github.ref_name, 'json-document-v')
         run: npm publish -w @interactive-os/json-document --tag next --provenance
+      - name: Publish extension prereleases
+        if: startsWith(github.ref_name, 'json-document-extensions-v')
+        run: |
+          for package in \
+            @interactive-os/json-document-grouping \
+            @interactive-os/json-document-patch-preview \
+            @interactive-os/json-document-search-replace
+          do
+            npm publish -w "$package" --tag next --provenance
+          done
diff --git a/apps/site/src/generated/repo-catalog.ts b/apps/site/src/generated/repo-catalog.ts
index 32b5f26a..dccd4156 100644
--- a/apps/site/src/generated/repo-catalog.ts
+++ b/apps/site/src/generated/repo-catalog.ts
@@ -310,7 +310,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official structural group and ungroup extension functions for json-document documents.",
       "license": "MIT",
       "summary": "Official extension for structural `group` and `ungroup`.",
@@ -628,7 +628,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official patch preview extension functions for dry-running json-document document patches.",
       "license": "MIT",
       "summary": "Official headless patch preview extension for `@interactive-os/json-document` documents.",
@@ -835,7 +835,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official search and replace extension functions for text fields in json-document documents.",
       "license": "MIT",
       "summary": "Official headless search and replace extension for text fields in `@interactive-os/json-document`\ndocuments.",
@@ -1219,7 +1219,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official structural group and ungroup extension functions for json-document documents.",
       "license": "MIT",
       "summary": "Official extension for structural `group` and `ungroup`.",
@@ -1372,7 +1372,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official patch preview extension functions for dry-running json-document document patches.",
       "license": "MIT",
       "summary": "Official headless patch preview extension for `@interactive-os/json-document` documents.",
@@ -1579,7 +1579,7 @@ export const repoCatalog = {
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official search and replace extension functions for text fields in json-document documents.",
       "license": "MIT",
       "summary": "Official headless search and replace extension for text fields in `@interactive-os/json-document`\ndocuments.",
diff --git a/docs/changelog.md b/docs/changelog.md
index b5162498..ea42b915 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -17,6 +17,16 @@ The unified mutation success result described below changes the runtime shape
 published in `1.0.1`. Treat it as an integration experiment, not a stable 1.x
 compatibility promise. Its final shape must be decided before a stable release.
 
+Companion integration prereleases are published under the `next` dist-tag for
+`@interactive-os/json-document-grouping`,
+`@interactive-os/json-document-patch-preview`, and
+`@interactive-os/json-document-search-replace` at `0.1.1-rc.0`. They keep their
+stable `0.1.0` APIs and expand the core peer range to
+`^1.0.1 || ^1.1.0-rc.0`, allowing `canvas` to exercise a registry-only RC graph.
+The grouping RC also commits its documented `selectionAfter` atomically with
+the structural patch, so undo and redo restore the matching selection state.
+Each companion RC tarball now includes the repository MIT license text.
+
 ### Added
 
 - Added `doc.query(jsonpath)` and `doc.canQuery(jsonpath)` as the canonical
diff --git a/docs/generated/repo-catalog.json b/docs/generated/repo-catalog.json
index 110c01fb..e4f32cc3 100644
--- a/docs/generated/repo-catalog.json
+++ b/docs/generated/repo-catalog.json
@@ -309,7 +309,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official structural group and ungroup extension functions for json-document documents.",
       "license": "MIT",
       "summary": "Official extension for structural `group` and `ungroup`.",
@@ -627,7 +627,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official patch preview extension functions for dry-running json-document document patches.",
       "license": "MIT",
       "summary": "Official headless patch preview extension for `@interactive-os/json-document` documents.",
@@ -834,7 +834,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official search and replace extension functions for text fields in json-document documents.",
       "license": "MIT",
       "summary": "Official headless search and replace extension for text fields in `@interactive-os/json-document`\ndocuments.",
@@ -1218,7 +1218,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official structural group and ungroup extension functions for json-document documents.",
       "license": "MIT",
       "summary": "Official extension for structural `group` and `ungroup`.",
@@ -1371,7 +1371,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official patch preview extension functions for dry-running json-document document patches.",
       "license": "MIT",
       "summary": "Official headless patch preview extension for `@interactive-os/json-document` documents.",
@@ -1578,7 +1578,7 @@
       "status": "official-extension",
       "private": false,
       "publishable": true,
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "description": "Official search and replace extension functions for text fields in json-document documents.",
       "license": "MIT",
       "summary": "Official headless search and replace extension for text fields in `@interactive-os/json-document`\ndocuments.",
diff --git a/docs/public/extensions.md b/docs/public/extensions.md
index 75225ba3..7158829a 100644
--- a/docs/public/extensions.md
+++ b/docs/public/extensions.md
@@ -12,6 +12,20 @@ Extension은 core에 plugin으로 등록하지 않습니다. public `JSONDocumen
 npm install @interactive-os/json-document @interactive-os/json-document-collection
 ```
 
+`1.1.0-rc.0` integration testing uses exact versions and the `next` dist-tag.
+The companion RC set for `canvas` is:
+
+```sh
+npm install --save-exact \
+  @interactive-os/json-document@1.1.0-rc.0 \
+  @interactive-os/json-document-grouping@0.1.1-rc.0 \
+  @interactive-os/json-document-patch-preview@0.1.1-rc.0 \
+  @interactive-os/json-document-search-replace@0.1.1-rc.0
+```
+
+This RC set is an opt-in integration graph. Stable consumers continue to use
+the packages' `latest` dist-tags.
+
 ## 공식 extension
 
 공식 extension 목록과 lab 후보 목록은 repo catalog에서 생성됩니다. `packages/*`에 있는 publishable `@interactive-os/json-document-*` package가 공식 extension이고, `labs/extensions/*`는 후보입니다. public 문서에서 lab package를 공식 extension이라고 부르지 않습니다.
diff --git a/package-lock.json b/package-lock.json
index a0af3e31..268db736 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6529,7 +6529,7 @@
     },
     "packages/grouping": {
       "name": "@interactive-os/json-document-grouping",
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "license": "MIT",
       "devDependencies": {
         "@interactive-os/json-document": "*",
@@ -6538,7 +6538,7 @@
         "zod": "^4.0.0"
       },
       "peerDependencies": {
-        "@interactive-os/json-document": "^1.0.0"
+        "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
       }
     },
     "packages/id-resolver": {
@@ -6609,7 +6609,7 @@
     },
     "packages/patch-preview": {
       "name": "@interactive-os/json-document-patch-preview",
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "license": "MIT",
       "devDependencies": {
         "@interactive-os/json-document": "*",
@@ -6618,7 +6618,7 @@
         "zod": "^4.0.0"
       },
       "peerDependencies": {
-        "@interactive-os/json-document": "^1.0.0"
+        "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
       }
     },
     "packages/persist-web": {
@@ -6679,7 +6679,7 @@
     },
     "packages/search-replace": {
       "name": "@interactive-os/json-document-search-replace",
-      "version": "0.1.0",
+      "version": "0.1.1-rc.0",
       "license": "MIT",
       "devDependencies": {
         "@interactive-os/json-document": "*",
@@ -6688,7 +6688,7 @@
         "zod": "^4.0.0"
       },
       "peerDependencies": {
-        "@interactive-os/json-document": "^1.0.0"
+        "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
       }
     },
     "packages/snippets": {
diff --git a/packages/grouping/LICENSE b/packages/grouping/LICENSE
new file mode 100644
index 00000000..334271fb
--- /dev/null
+++ b/packages/grouping/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 json-document contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/grouping/README.md b/packages/grouping/README.md
index 917e0d7d..347bd0cd 100644
--- a/packages/grouping/README.md
+++ b/packages/grouping/README.md
@@ -2,6 +2,10 @@
 
 Official extension for structural `group` and `ungroup`.
 
+> `0.1.1-rc.0` is a companion prerelease for
+> `@interactive-os/json-document@1.1.0-rc.0`. Pin both versions exactly while
+> the core mutation result contract is under integration testing.
+
 ## Scope
 
 - select contiguous sibling JSON array items
diff --git a/packages/grouping/package.json b/packages/grouping/package.json
index c8eeb946..402eb279 100644
--- a/packages/grouping/package.json
+++ b/packages/grouping/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@interactive-os/json-document-grouping",
-  "version": "0.1.0",
+  "version": "0.1.1-rc.0",
   "description": "Official structural group and ungroup extension functions for json-document documents.",
   "type": "module",
   "license": "MIT",
@@ -15,7 +15,8 @@
   "publishConfig": {
     "access": "public",
     "provenance": true,
-    "registry": "https://registry.npmjs.org/"
+    "registry": "https://registry.npmjs.org/",
+    "tag": "next"
   },
   "keywords": [
     "@interactive-os/json-document",
@@ -42,7 +43,7 @@
     "verify": "npm run typecheck && npm test && npm run build"
   },
   "peerDependencies": {
-    "@interactive-os/json-document": "^1.0.0"
+    "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
   },
   "devDependencies": {
     "typescript": "^5.0.0",
diff --git a/packages/grouping/tests/grouping.test.ts b/packages/grouping/tests/grouping.test.ts
index 34b4951d..9ba9f0e0 100644
--- a/packages/grouping/tests/grouping.test.ts
+++ b/packages/grouping/tests/grouping.test.ts
@@ -60,6 +60,22 @@ function createBoard() {
   });
 }
 
+function createSelectableBoard() {
+  return createJSONDocument(BoardSchema, {
+    nodes: [
+      { id: "a", kind: "item", title: "Alpha" },
+      { id: "b", kind: "item", title: "Beta" },
+      { id: "c", kind: "item", title: "Gamma" },
+    ],
+  }, {
+    history: 10,
+    selection: {
+      mode: "multiple",
+      initial: ["/nodes/0", "/nodes/1"],
+    },
+  });
+}
+
 describe("@interactive-os/json-document-grouping", () => {
   test("groups selected sibling items into one schema-valid group", () => {
     const doc = createBoard();
@@ -108,6 +124,51 @@ describe("@interactive-os/json-document-grouping", () => {
     expect(doc.value.nodes.map((node) => node.id)).toEqual(["a", "b", "c"]);
   });
 
+  test("commits grouped selection atomically through undo and redo", () => {
+    const doc = createSelectableBoard();
+
+    expect(groupSelection(doc, groupingAdapter, ["/nodes/0", "/nodes/1"])).toMatchObject({
+      ok: true,
+      selectionAfter: ["/nodes/0"],
+    });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["group-0", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/0");
+
+    expect(doc.undo()).toEqual({ ok: true });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["a", "b", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0", "/nodes/1"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/1");
+
+    expect(doc.redo()).toEqual({ ok: true });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["group-0", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/0");
+  });
+
+  test("commits ungrouped child selection atomically through undo and redo", () => {
+    const doc = createSelectableBoard();
+    expect(groupSelection(doc, groupingAdapter, ["/nodes/0", "/nodes/1"])).toMatchObject({ ok: true });
+
+    expect(ungroupSelection(doc, groupingAdapter, "/nodes/0")).toMatchObject({
+      ok: true,
+      selectionAfter: ["/nodes/0", "/nodes/1"],
+    });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["a", "b", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0", "/nodes/1"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/1");
+
+    expect(doc.undo()).toEqual({ ok: true });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["group-0", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/0");
+
+    expect(doc.redo()).toEqual({ ok: true });
+    expect(doc.value.nodes.map((node) => node.id)).toEqual(["a", "b", "c"]);
+    expect(doc.selection?.selectedPointers).toEqual(["/nodes/0", "/nodes/1"]);
+    expect(doc.selection?.primaryPointer).toBe("/nodes/1");
+  });
+
   test("deduplicates selected pointers and prunes nested descendants before grouping", () => {
     const doc = createJSONDocument(BoardSchema, {
       nodes: [
diff --git a/packages/patch-preview/LICENSE b/packages/patch-preview/LICENSE
new file mode 100644
index 00000000..334271fb
--- /dev/null
+++ b/packages/patch-preview/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 json-document contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/patch-preview/README.md b/packages/patch-preview/README.md
index a9d7f080..c1510a6f 100644
--- a/packages/patch-preview/README.md
+++ b/packages/patch-preview/README.md
@@ -2,6 +2,10 @@
 
 Official headless patch preview extension for `@interactive-os/json-document` documents.
 
+> `0.1.1-rc.0` is a companion prerelease for
+> `@interactive-os/json-document@1.1.0-rc.0`. Pin both versions exactly while
+> the core mutation result contract is under integration testing.
+
 Use it when a product needs to preview schema-safe JSON Patch changes before
 applying them: import review, find/replace confirmation, AI proposed changes,
 bulk cleanup, dry-run save checks, or admin moderation.
diff --git a/packages/patch-preview/package.json b/packages/patch-preview/package.json
index 343117f6..c79e2662 100644
--- a/packages/patch-preview/package.json
+++ b/packages/patch-preview/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@interactive-os/json-document-patch-preview",
-  "version": "0.1.0",
+  "version": "0.1.1-rc.0",
   "description": "Official patch preview extension functions for dry-running json-document document patches.",
   "type": "module",
   "license": "MIT",
@@ -14,7 +14,8 @@
   },
   "publishConfig": {
     "access": "public",
-    "provenance": true
+    "provenance": true,
+    "tag": "next"
   },
   "keywords": [
     "@interactive-os/json-document",
@@ -41,7 +42,7 @@
     "verify": "npm run typecheck && npm test && npm run build"
   },
   "peerDependencies": {
-    "@interactive-os/json-document": "^1.0.0"
+    "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
   },
   "devDependencies": {
     "typescript": "^5.0.0",
diff --git a/packages/search-replace/LICENSE b/packages/search-replace/LICENSE
new file mode 100644
index 00000000..334271fb
--- /dev/null
+++ b/packages/search-replace/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 json-document contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/search-replace/README.md b/packages/search-replace/README.md
index 75519291..5e66e985 100644
--- a/packages/search-replace/README.md
+++ b/packages/search-replace/README.md
@@ -3,6 +3,10 @@
 Official headless search and replace extension for text fields in `@interactive-os/json-document`
 documents.
 
+> `0.1.1-rc.0` is a companion prerelease for
+> `@interactive-os/json-document@1.1.0-rc.0`. Pin both versions exactly while
+> the core mutation result contract is under integration testing.
+
 Use it when a product needs document-wide or subtree text search over JSON
 string fields: block documents, CMS copy review, generated admin editors,
 slide notes, import cleanup, or settings search.
diff --git a/packages/search-replace/package.json b/packages/search-replace/package.json
index 78715745..7354bf9f 100644
--- a/packages/search-replace/package.json
+++ b/packages/search-replace/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@interactive-os/json-document-search-replace",
-  "version": "0.1.0",
+  "version": "0.1.1-rc.0",
   "description": "Official search and replace extension functions for text fields in json-document documents.",
   "type": "module",
   "license": "MIT",
@@ -15,7 +15,8 @@
   "publishConfig": {
     "access": "public",
     "provenance": true,
-    "registry": "https://registry.npmjs.org/"
+    "registry": "https://registry.npmjs.org/",
+    "tag": "next"
   },
   "keywords": [
     "@interactive-os/json-document",
@@ -42,7 +43,7 @@
     "verify": "npm run typecheck && npm test && npm run build"
   },
   "peerDependencies": {
-    "@interactive-os/json-document": "^1.0.0"
+    "@interactive-os/json-document": "^1.0.1 || ^1.1.0-rc.0"
   },
   "devDependencies": {
     "typescript": "^5.0.0",
diff --git a/scripts/evaluate-extensions.mjs b/scripts/evaluate-extensions.mjs
index b9f965f9..026d47f6 100644
--- a/scripts/evaluate-extensions.mjs
+++ b/scripts/evaluate-extensions.mjs
@@ -2,6 +2,10 @@ import { existsSync, readdirSync, readFileSync } from "node:fs";
 import { join } from "node:path";
 
 const root = new URL("..", import.meta.url).pathname;
+const corePeerRanges = new Set([
+  "^1.0.0",
+  "^1.0.1 || ^1.1.0-rc.0",
+]);
 const officialExtensions = [
   {
     root: "packages/clipboard-web",
@@ -303,8 +307,8 @@ for (const extension of officialExtensions) {
   if (pkg.private === true) {
     fail(`${label}: official extension packages must be publishable.`);
   }
-  if (pkg.peerDependencies?.["@interactive-os/json-document"] !== "^1.0.0") {
-    fail(`${label}: json-document must stay a peer dependency.`);
+  if (!corePeerRanges.has(pkg.peerDependencies?.["@interactive-os/json-document"])) {
+    fail(`${label}: json-document must stay an approved peer dependency range.`);
   }
   if (pkg.dependencies?.["@interactive-os/json-document"]) {
     fail(`${label}: json-document must not be a runtime dependency.`);