diff --git a/.changeset/README.md b/.changeset/README.md
new file mode 100644
index 0000000000..49096342b7
--- /dev/null
+++ b/.changeset/README.md
@@ -0,0 +1,19 @@
+# Changesets
+
+The TypeScript packages in this repo are versioned with [changesets](https://github.com/changesets/changesets). If your PR changes a TypeScript server in `src/` in a way users will notice, add a changeset:
+
+```bash
+npm run changeset
+```
+
+Pick the affected package(s), choose a bump type, and write a one-line summary — that line becomes the CHANGELOG entry. Commit the generated file in `.changeset/` with your PR.
+
+Bump types:
+
+- **patch** — bug fixes
+- **minor** — new tools, prompts, resources, or options
+- **major** — breaking changes (tool removed or renamed, schema change that breaks clients, protocol or Node floor bump)
+
+Docs-only, CI-only, and Python-only changes don't need a changeset. The Python servers (`fetch`, `git`, `time`) use CalVer and are not managed by changesets — see [RELEASING.md](../RELEASING.md).
+
+Merged changesets accumulate in a rolling **"Version Packages" PR**; merging that PR applies the version bumps and CHANGELOG updates. Publishing happens when a maintainer creates a GitHub Release.
diff --git a/.changeset/config.json b/.changeset/config.json
new file mode 100644
index 0000000000..33c415fa4e
--- /dev/null
+++ b/.changeset/config.json
@@ -0,0 +1,14 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.1/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "modelcontextprotocol/servers" }
+  ],
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}
diff --git a/.github/workflows/prepare-python-release.yml b/.github/workflows/prepare-python-release.yml
new file mode 100644
index 0000000000..7cea5dd843
--- /dev/null
+++ b/.github/workflows/prepare-python-release.yml
@@ -0,0 +1,69 @@
+name: Prepare Python Release
+
+# Stamps today's CalVer date (e.g. 2026.8.1) onto Python packages that changed
+# since their last version bump, and opens a normal PR with the result. The
+# TypeScript packages are versioned by changesets (see version-packages.yml).
+# Publishing happens separately, when a maintainer creates a GitHub Release.
+
+on:
+  workflow_dispatch:
+
+jobs:
+  prepare:
+    if: github.repository_owner == 'modelcontextprotocol'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
+      - name: Stamp CalVer versions
+        run: uv run --script scripts/prepare_python_release.py --directory src > stamped.txt
+
+      - name: Check for changes
+        id: changes
+        run: |
+          if git diff --quiet; then
+            echo "No Python packages need a version stamp"
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create pull request
+        if: steps.changes.outputs.changed == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          DATE=$(date +%Y.%-m.%-d)
+          BRANCH="release/python-$DATE"
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git checkout -b "$BRANCH"
+          git add -u
+          git commit -m "chore: stamp Python CalVer versions for $DATE"
+          git push --force origin "$BRANCH"
+          {
+            echo "Stamps today's CalVer date onto the Python packages that changed since their last version bump:"
+            echo
+            sed 's/^/- /' stamped.txt
+            echo
+            echo "Generated by the **Prepare Python Release** workflow. After merging, create a GitHub Release to publish."
+            echo
+            echo "> [!NOTE]"
+            echo "> PRs opened with the workflow token don't trigger CI — close and reopen this PR to run it."
+          } > pr-body.md
+          if gh pr list --head "$BRANCH" --state open --json number --jq length | grep -qv '^0$'; then
+            echo "PR for $BRANCH already open — branch updated"
+          else
+            gh pr create \
+              --head "$BRANCH" \
+              --title "chore: stamp Python CalVer versions for $DATE" \
+              --body-file pr-body.md
+          fi
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fd05addc73..fe1bfc4400 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,124 +1,137 @@
 name: Release
 
+# Publishing is triggered by a maintainer creating a GitHub Release (see
+# RELEASING.md). No job here computes, stamps, or tags a version: the versions
+# in package.json / pyproject.toml on the released ref are the source of truth,
+# and every package publishes if (and only if) its version is not already on
+# the registry. A package whose publish failed or was skipped simply publishes
+# on the next release — the registry-diff guard picks it up.
+#
+# Authentication is OIDC trusted publishing on both registries. The npm and
+# PyPI trusted publishers are bound to this workflow filename (release.yml)
+# and the `release` environment — the publish jobs must stay in this file.
+
 on:
-  workflow_dispatch:
+  release:
+    types: [published]
 
 jobs:
-  create-metadata:
+  detect-packages:
     runs-on: ubuntu-latest
     if: github.repository_owner == 'modelcontextprotocol'
     outputs:
-      hash: ${{ steps.last-release.outputs.hash }}
-      version: ${{ steps.create-version.outputs.version}}
-      npm_packages: ${{ steps.create-npm-packages.outputs.npm_packages}}
-      pypi_packages: ${{ steps.create-pypi-packages.outputs.pypi_packages}}
+      npm_packages: ${{ steps.find-packages.outputs.npm_packages }}
+      pypi_packages: ${{ steps.find-packages.outputs.pypi_packages }}
     steps:
+      # Defaults to the release tag — the exact ref the maintainer released
       - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-
-      - name: Get last release hash
-        id: last-release
-        run: |
-          HASH=$(git rev-list --tags --max-count=1 || echo "HEAD~1")
-          echo "hash=${HASH}" >> $GITHUB_OUTPUT
-          echo "Using last release hash: ${HASH}"
 
-      - name: Install uv
-        uses: astral-sh/setup-uv@v7
-
-      - name: Create version name
-        id: create-version
+      - name: Find all packages
+        id: find-packages
+        working-directory: src
         run: |
-          VERSION=$(uv run --script scripts/release.py generate-version)
-          echo "version $VERSION"
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          NPM=$(find . -name package.json -not -path "*/node_modules/*" -exec dirname {} \; | sed 's/^\.\///' | jq -R -s -c 'split("\n")[:-1]')
+          PYPI=$(find . -name pyproject.toml -exec dirname {} \; | sed 's/^\.\///' | jq -R -s -c 'split("\n")[:-1]')
+          echo "npm_packages=$NPM" >> "$GITHUB_OUTPUT"
+          echo "pypi_packages=$PYPI" >> "$GITHUB_OUTPUT"
 
-      - name: Create notes
-        run: |
-          HASH="${{ steps.last-release.outputs.hash }}"
-          uv run --script scripts/release.py generate-notes --directory src/ $HASH > RELEASE_NOTES.md
-          cat RELEASE_NOTES.md
-
-      - name: Release notes
-        uses: actions/upload-artifact@v7
-        with:
-          name: release-notes
-          path: RELEASE_NOTES.md
-
-      - name: Create python matrix
-        id: create-pypi-packages
-        run: |
-          HASH="${{ steps.last-release.outputs.hash }}"
-          PYPI=$(uv run --script scripts/release.py generate-matrix --pypi --directory src $HASH)
-          echo "pypi_packages $PYPI"
-          echo "pypi_packages=$PYPI" >> $GITHUB_OUTPUT
-
-      - name: Create npm matrix
-        id: create-npm-packages
-        run: |
-          HASH="${{ steps.last-release.outputs.hash }}"
-          NPM=$(uv run --script scripts/release.py generate-matrix --npm --directory src $HASH)
-          echo "npm_packages $NPM"
-          echo "npm_packages=$NPM" >> $GITHUB_OUTPUT
-
-  update-packages:
-    needs: [create-metadata]
-    if: ${{ needs.create-metadata.outputs.npm_packages != '[]' || needs.create-metadata.outputs.pypi_packages != '[]' }}
-    runs-on: ubuntu-latest
+  publish-npm:
+    needs: [detect-packages]
+    if: ${{ needs.detect-packages.outputs.npm_packages != '[]' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        package: ${{ fromJson(needs.detect-packages.outputs.npm_packages) }}
+    name: Publish ${{ matrix.package }} (npm)
     environment: release
     permissions:
-      contents: write
-    outputs:
-      changes_made: ${{ steps.commit.outputs.changes_made }}
+      contents: read
+      id-token: write # Required for npm trusted publishing (OIDC)
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-
-      - name: Install uv
-        uses: astral-sh/setup-uv@v7
 
-      - name: Update packages
-        run: |
-          HASH="${{ needs.create-metadata.outputs.hash }}"
-          uv run --script scripts/release.py update-packages --directory src/ $HASH
+      - uses: actions/setup-node@v7
+        with:
+          node-version: 22
+          cache: npm
+          registry-url: "https://registry.npmjs.org"
 
-      - name: Configure git
-        run: |
-          git config --global user.name "GitHub Actions"
-          git config --global user.email "actions@github.com"
+      # OIDC trusted publishing requires npm >=11.5.1; Node 22's bundled npm is 10.x.
+      - name: Ensure npm CLI supports OIDC trusted publishing
+        run: npm install -g npm@^11.5.1
 
-      - name: Commit changes
-        id: commit
+      # Registry-diff guard: skip (not fail) when the version is already
+      # published, and treat a never-published package (E404) as "publish it"
+      - name: Check whether this version is already on npm
+        id: guard
+        working-directory: src/${{ matrix.package }}
         run: |
-          VERSION="${{ needs.create-metadata.outputs.version }}"
-          git add -u
-          if git diff-index --quiet HEAD; then
-            echo "changes_made=false" >> $GITHUB_OUTPUT
+          NAME=$(jq -r .name package.json)
+          VERSION=$(jq -r .version package.json)
+          # stdout only: with --json, npm writes errors as JSON to stdout, and
+          # stray stderr warnings must not corrupt the payload we parse
+          set +e
+          PUBLISHED=$(npm view "$NAME" versions --json 2>/dev/null)
+          EXIT_CODE=$?
+          set -e
+          if [ $EXIT_CODE -ne 0 ]; then
+            if echo "$PUBLISHED" | grep -q "E404"; then
+              echo "$NAME has never been published — proceeding with first publish"
+              echo "skip=false" >> "$GITHUB_OUTPUT"
+            else
+              echo "npm view failed for $NAME:"
+              echo "$PUBLISHED"
+              exit 1
+            fi
+          elif echo "$PUBLISHED" | jq -e --arg v "$VERSION" '(if type == "array" then . else [.] end) | index($v) != null' > /dev/null; then
+            echo "$NAME@$VERSION is already on npm — skipping"
+            echo "skip=true" >> "$GITHUB_OUTPUT"
           else
-            git commit -m 'Automatic update of packages'
-            git tag -a "$VERSION" -m "Release $VERSION"
-            git push origin "$VERSION"
-            echo "changes_made=true" >> $GITHUB_OUTPUT
+            echo "$NAME@$VERSION is new — proceeding with publish"
+            echo "skip=false" >> "$GITHUB_OUTPUT"
           fi
 
+      - name: Install dependencies
+        if: steps.guard.outputs.skip != 'true'
+        working-directory: src/${{ matrix.package }}
+        run: npm ci
+
+      # Defense in depth: CI already validated main, but this tests the exact
+      # ref being published (covers manual tags and any future trigger path)
+      - name: Run tests
+        if: steps.guard.outputs.skip != 'true'
+        working-directory: src/${{ matrix.package }}
+        run: npm test --if-present
+
+      - name: Build package
+        if: steps.guard.outputs.skip != 'true'
+        working-directory: src/${{ matrix.package }}
+        run: npm run build
+
+      # Authenticates via OIDC trusted publishing (no token) — each package's
+      # npm trusted publisher is bound to this workflow + the release environment
+      - name: Publish package
+        if: steps.guard.outputs.skip != 'true'
+        working-directory: src/${{ matrix.package }}
+        run: npm publish --access public
+        env:
+          NPM_CONFIG_PROVENANCE: "true"
+
   publish-pypi:
-    needs: [update-packages, create-metadata]
-    if: ${{ needs.create-metadata.outputs.pypi_packages != '[]' && needs.create-metadata.outputs.pypi_packages != '' }}
+    needs: [detect-packages]
+    if: ${{ needs.detect-packages.outputs.pypi_packages != '[]' }}
     strategy:
       fail-fast: false
       matrix:
-        package: ${{ fromJson(needs.create-metadata.outputs.pypi_packages) }}
-    name: Build ${{ matrix.package }}
+        package: ${{ fromJson(needs.detect-packages.outputs.pypi_packages) }}
+    name: Publish ${{ matrix.package }} (PyPI)
     environment: release
     permissions:
       id-token: write # Required for trusted publishing
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-        with:
-          ref: ${{ needs.create-metadata.outputs.version }}
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7
@@ -136,6 +149,8 @@ jobs:
         working-directory: src/${{ matrix.package }}
         run: uv run --frozen pyright
 
+      # Defense in depth: CI already validated main, but this tests the exact
+      # ref being published (covers manual tags and any future trigger path)
       - name: Run tests
         working-directory: src/${{ matrix.package }}
         run: |
@@ -149,95 +164,10 @@ jobs:
         working-directory: src/${{ matrix.package }}
         run: uv build
 
+      # skip-existing is the PyPI equivalent of the npm registry-diff guard:
+      # an already-published version is skipped, not failed
       - name: Publish package to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           packages-dir: src/${{ matrix.package }}/dist
-          skip-existing: true # re-runs tolerate already-uploaded files
-
-  publish-npm:
-    needs: [update-packages, create-metadata]
-    if: ${{ needs.create-metadata.outputs.npm_packages != '[]' && needs.create-metadata.outputs.npm_packages != '' }}
-    strategy:
-      fail-fast: false
-      matrix:
-        package: ${{ fromJson(needs.create-metadata.outputs.npm_packages) }}
-    name: Build ${{ matrix.package }}
-    environment: release
-    permissions:
-      contents: read
-      id-token: write # Required for npm trusted publishing (OIDC)
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-        with:
-          ref: ${{ needs.create-metadata.outputs.version }}
-
-      - uses: actions/setup-node@v7
-        with:
-          node-version: 22
-          cache: npm
-          registry-url: 'https://registry.npmjs.org'
-
-      # OIDC trusted publishing requires npm >=11.5.1; Node 22's bundled npm is 10.x.
-      - name: Ensure npm CLI supports OIDC trusted publishing
-        run: npm install -g npm@^11.5.1
-
-      - name: Install dependencies
-        working-directory: src/${{ matrix.package }}
-        run: npm ci
-
-      - name: Check if version exists on npm
-        working-directory: src/${{ matrix.package }}
-        run: |
-          VERSION=$(jq -r .version package.json)
-          if npm view --json | jq -e --arg version "$VERSION" '[.[]][0].versions | contains([$version])'; then
-            echo "Version $VERSION already exists on npm"
-            exit 1
-          fi
-          echo "Version $VERSION is new, proceeding with publish"
-
-      - name: Run tests
-        working-directory: src/${{ matrix.package }}
-        run: npm test --if-present
-
-      - name: Build package
-        working-directory: src/${{ matrix.package }}
-        run: npm run build
-
-      # Authenticates via OIDC trusted publishing (no token) — each package's
-      # npm trusted publisher is bound to this workflow + the release environment
-      - name: Publish package
-        working-directory: src/${{ matrix.package }}
-        run: |
-          npm publish --access public
-        env:
-          NPM_CONFIG_PROVENANCE: "true"
-
-  create-release:
-    needs: [update-packages, create-metadata, publish-pypi, publish-npm]
-    if: |
-      always() &&
-      needs.update-packages.outputs.changes_made == 'true' &&
-      (needs.publish-pypi.result == 'success' || needs.publish-npm.result == 'success')
-    runs-on: ubuntu-latest
-    environment: release
-    permissions:
-      contents: write
-    steps:
-      - uses: actions/checkout@v6
-
-      - name: Download release notes
-        uses: actions/download-artifact@v8
-        with:
-          name: release-notes
-
-      - name: Create release
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN}}
-        run: |
-          VERSION="${{ needs.create-metadata.outputs.version }}"
-          gh release create "$VERSION" \
-            --title "Release $VERSION" \
-            --notes-file RELEASE_NOTES.md
-
+          skip-existing: true
diff --git a/.github/workflows/version-packages.yml b/.github/workflows/version-packages.yml
new file mode 100644
index 0000000000..a662fa5215
--- /dev/null
+++ b/.github/workflows/version-packages.yml
@@ -0,0 +1,39 @@
+name: Version Packages
+
+# Maintains the rolling changesets "Version Packages" PR: every push to main
+# re-runs `changeset version` against the accumulated changesets and creates or
+# updates the PR that applies the version bumps and CHANGELOG entries.
+# Publishing is separate — see release.yml (triggered by GitHub Releases).
+
+on:
+  push:
+    branches: [main]
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  version:
+    if: github.repository_owner == 'modelcontextprotocol'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: actions/setup-node@v7
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Create or update the Version Packages PR
+        uses: changesets/action@v1
+        with:
+          title: "chore: version packages"
+          commit: "chore: version packages"
+        env:
+          # Also used by @changesets/changelog-github to link PRs in CHANGELOGs
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8ce9a21dd6..ec190f1985 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -23,6 +23,18 @@ We're more selective about:
 We don't accept:
 - **New server implementations** — We encourage you to publish them to the [MCP Server Registry](https://github.com/modelcontextprotocol/registry) instead.
 
+## Changesets (TypeScript versioning)
+
+The TypeScript servers (`everything`, `filesystem`, `memory`, `sequentialthinking`) are versioned with [changesets](https://github.com/changesets/changesets). If your PR changes one of them in a way users will notice, include a changeset:
+
+```bash
+npm run changeset
+```
+
+Pick the affected package(s), choose a bump type (**patch** = bug fixes; **minor** = new tools, prompts, resources, or options; **major** = breaking changes), and write a one-line summary — it becomes the CHANGELOG entry. Commit the generated `.changeset/*.md` file with your PR.
+
+Docs-only, CI-only, and Python-only changes don't need a changeset. The Python servers use CalVer and are released separately — see [RELEASING.md](RELEASING.md).
+
 ## Testing
 
 When adding or configuring tests for servers implemented in TypeScript, use **vitest** as the test framework. Vitest provides better ESM support, faster test execution, and a more modern testing experience.
diff --git a/RELEASING.md b/RELEASING.md
index fc7056c4d8..eb7d1d399b 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -1,22 +1,38 @@
 # Releasing
 
-How the packages in this repository are published, and what to do when a publish fails.
+How the packages in this repository are versioned and published, and what to do when a publish fails.
+
+## How versioning works
+
+**No workflow ever computes or stamps a version at release time.** The version in each package's manifest on `main` is the source of truth, and versions only change through reviewed PRs:
+
+- **TypeScript servers** (`everything`, `filesystem`, `memory`, `sequentialthinking`) use **semver, managed by [changesets](https://github.com/changesets/changesets)**. Feature PRs include a changeset file (see [CONTRIBUTING.md](CONTRIBUTING.md)); merged changesets accumulate in a rolling **"Version Packages" PR** (maintained by [`version-packages.yml`](.github/workflows/version-packages.yml) on every push to `main`), which applies version bumps and CHANGELOG entries when merged. Semver policy: **patch** = bug fixes; **minor** = new tools, prompts, resources, or options; **major** = breaking changes (tool removed or renamed, schema change that breaks clients, protocol or Node floor bump).
+- **Python servers** (`fetch`, `git`, `time`) use **CalVer** (e.g. `2026.8.1`). A maintainer dispatches the **Prepare Python Release** workflow ([`prepare-python-release.yml`](.github/workflows/prepare-python-release.yml)), which stamps today's date onto each Python package that changed since its last version bump and opens a normal PR.
+
+> [!NOTE]
+> PRs opened by these workflows use the workflow token, which doesn't trigger CI. Close and reopen the PR to run CI before merging.
 
 ## How publishing works
 
-All packages publish exclusively from the [`release.yml`](.github/workflows/release.yml) GitHub Actions workflow, gated by the `release` environment (a required reviewer must approve each deployment). Releases are triggered deliberately by a maintainer via **workflow_dispatch** (Actions → Release → Run workflow, or `gh workflow run release.yml`) — there is no scheduled/automatic release.
+Publishing is triggered by a maintainer **creating a GitHub Release** (Releases → Draft a new release → choose or create a tag on `main` → auto-generate notes → publish). The release tag is just a label — it carries no version semantics.
+
+The [`release.yml`](.github/workflows/release.yml) workflow runs on `release: published`, gated by the `release` environment (a required reviewer must approve each deployment). It runs every package as an independent matrix job (`fail-fast: false` — one package's failure never blocks another). Each job: checkout at the release tag → registry-diff guard → install → **run the package's tests** (plus `pyright` for Python) → build → publish.
+
+The **registry-diff guard** makes releases idempotent and self-healing: a package whose version already exists on the registry is **skipped, not failed** (npm: an explicit version check, where a never-published package counts as "publish it"; PyPI: `skip-existing` on the upload action). A package whose publish failed or was skipped simply publishes on the next release.
 
 **Authentication is OIDC trusted publishing on both registries — there are no registry tokens.**
 
-- **npm** (TypeScript servers): each `@modelcontextprotocol/*` package is registered on npmjs.com with a [trusted publisher](https://docs.npmjs.com/trusted-publishers) bound to this repository, workflow filename `release.yml`, and environment `release` (the binding is case-sensitive). Packages publish with [provenance attestations](https://docs.npmjs.com/generating-provenance-statements).
-- **PyPI** (Python servers): published via [PyPI trusted publishing](https://docs.pypi.org/trusted-publishers/) using `pypa/gh-action-pypi-publish`.
+- **npm**: each `@modelcontextprotocol/*` package is registered on npmjs.com with a [trusted publisher](https://docs.npmjs.com/trusted-publishers) bound to this repository, workflow filename `release.yml`, and environment `release` (the binding is case-sensitive). Packages publish with [provenance attestations](https://docs.npmjs.com/generating-provenance-statements).
+- **PyPI**: published via [PyPI trusted publishing](https://docs.pypi.org/trusted-publishers/) using `pypa/gh-action-pypi-publish`, with the same `release.yml` + `release` environment binding.
+
+Because of those bindings, the publish jobs must stay in `release.yml` and keep the `release` environment.
 
-A release run:
+## Cutting a release
 
-1. **Detects changed packages** since the last release tag — a package counts as changed if any `.py`, `.ts`, or `.md` file in its directory changed (READMEs ship inside the published artifacts).
-2. **Stamps versions and pushes the release tag** — versions are date-based (CalVer, e.g. `2026.7.4`).
-3. **Publishes each changed package as an independent matrix job** (`fail-fast: false` — one package's failure never blocks another). Each job: checkout at the release tag → install → double-publish guard → **run the package's tests** (plus `pyright` for Python) → build → publish. The guard differs by registry: the npm job aborts before tests if the version already exists; for PyPI the skip happens at the publish step itself (`skip-existing` on the upload action).
-4. **Creates the GitHub release** with generated notes.
+1. Make sure the version bumps you want to ship are on `main`: merge the **Version Packages** PR (TypeScript) and/or the **Prepare Python Release** PR (Python). CI validates these like any other PR.
+2. Create a GitHub Release on the releases page with auto-generated notes. Any tag name works (it's a label, not a version); dating them (e.g. `release-2026-08-01`) keeps the list readable.
+3. Approve the `release` environment deployments when prompted.
+4. Each package publishes if its version isn't on the registry yet; already-published packages skip cleanly.
 
 ## When a publish fails
 
@@ -29,21 +45,17 @@ gh run rerun <run-id> --failed --repo modelcontextprotocol/servers
 ```
 
 - A re-run is still a `release.yml` run in the `release` environment, so it satisfies the trusted-publisher binding.
-- It re-runs only the failed legs, checked out at the original release tag — it publishes exactly the tagged code, and the double-publish guard keeps already-published packages safe.
+- It re-runs only the failed legs, checked out at the original release tag — it publishes exactly the released code, and the registry-diff guard keeps already-published packages safe.
 - It needs a fresh `release` environment approval, and the run must be complete first (approve or reject any pending deployments).
 - GitHub's re-run window is ~30 days from the original run, and re-runs execute the *original* workflow snapshot — workflow fixes on `main` don't apply to a re-run.
 
-**Otherwise: let the next release pick it up.** If the re-run window has closed (or the fix required a workflow change), the failed version simply never exists on that registry — that's benign; npm and PyPI version histories don't need to match. The package publishes at the next version, provided it has a qualifying change (`.py`, `.ts`, or `.md`) since the last release tag.
+**Otherwise: just cut the next release.** The registry-diff guard picks up any version that never made it to the registry — no stranded versions, no artificial file touches.
 
 **Never:**
 
 - Publish manually with an npm token or from a laptop — there are no registry tokens, and manual publishes would break the provenance/trust chain.
-- Dispatch a fresh `release.yml` run expecting it to retry a failed version — versions are date-granular, so a same-day dispatch collides with the existing tag, and a later dispatch mints a *new* version. Neither retries the failed one.
+- Edit versions directly on `main` to force a publish — versions change only through the Version Packages and Prepare Python Release PRs.
 
 ## Environment approvals
 
 The `release` environment's required-reviewer list is configured in the repository settings (Settings → Environments → `release`). Reviewer rights come only from that list — repository admin does not confer deployment approval.
-
----
-
-Planned changes to this process — semver via changesets for the TypeScript packages, publishing triggered by manually-created GitHub Releases — are tracked in [#4463](https://github.com/modelcontextprotocol/servers/issues/4463). This document will be updated when that work merges.
diff --git a/package-lock.json b/package-lock.json
index 1845571736..1a3c729ae8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,6 +16,10 @@
         "@modelcontextprotocol/server-filesystem": "*",
         "@modelcontextprotocol/server-memory": "*",
         "@modelcontextprotocol/server-sequential-thinking": "*"
+      },
+      "devDependencies": {
+        "@changesets/changelog-github": "^0.5.1",
+        "@changesets/cli": "^2.29.5"
       }
     },
     "node_modules/@babel/helper-string-parser": {
@@ -54,6 +58,16 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.7.tgz",
+      "integrity": "sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/types": {
       "version": "7.29.7",
       "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.7.tgz",
@@ -78,6 +92,271 @@
         "node": ">=18"
       }
     },
+    "node_modules/@changesets/apply-release-plan": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@changesets/apply-release-plan/-/apply-release-plan-7.1.1.tgz",
+      "integrity": "sha512-9qPCm/rLx/xoOFXIHGB229+4GOL76S4MC+7tyOuTsR6+1jYlfFDQORdvwR5hDA6y4FL2BPt3qpbcQIS+dW85LA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/config": "^3.1.4",
+        "@changesets/get-version-range-type": "^0.4.0",
+        "@changesets/git": "^3.0.4",
+        "@changesets/should-skip-package": "^0.1.2",
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "detect-indent": "^6.0.0",
+        "fs-extra": "^7.0.1",
+        "lodash.startcase": "^4.4.0",
+        "outdent": "^0.5.0",
+        "prettier": "^2.7.1",
+        "resolve-from": "^5.0.0",
+        "semver": "^7.5.3"
+      }
+    },
+    "node_modules/@changesets/assemble-release-plan": {
+      "version": "6.0.10",
+      "resolved": "https://registry.npmjs.org/@changesets/assemble-release-plan/-/assemble-release-plan-6.0.10.tgz",
+      "integrity": "sha512-rSDcqdJ9KbVyjpBIuCidhvZNIiVt1XaIYp73ycVQRIA5n/j6wQaEk0ChRLMUQ1vkxZe51PTQ9OIhbg6HQMW45A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/errors": "^0.2.0",
+        "@changesets/get-dependents-graph": "^2.1.4",
+        "@changesets/should-skip-package": "^0.1.2",
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "semver": "^7.5.3"
+      }
+    },
+    "node_modules/@changesets/changelog-git": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@changesets/changelog-git/-/changelog-git-0.2.1.tgz",
+      "integrity": "sha512-x/xEleCFLH28c3bQeQIyeZf8lFXyDFVn1SgcBiR2Tw/r4IAWlk1fzxCEZ6NxQAjF2Nwtczoen3OA2qR+UawQ8Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/types": "^6.1.0"
+      }
+    },
+    "node_modules/@changesets/changelog-github": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/@changesets/changelog-github/-/changelog-github-0.5.2.tgz",
+      "integrity": "sha512-HeGeDl8HaIGj9fQHo/tv5XKQ2SNEi9+9yl1Bss1jttPqeiASRXhfi0A2wv8yFKCp07kR1gpOI5ge6+CWNm1jPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/get-github-info": "^0.7.0",
+        "@changesets/types": "^6.1.0",
+        "dotenv": "^8.1.0"
+      }
+    },
+    "node_modules/@changesets/cli": {
+      "version": "2.31.1",
+      "resolved": "https://registry.npmjs.org/@changesets/cli/-/cli-2.31.1.tgz",
+      "integrity": "sha512-uO05WTcRBwuVOJVSW8Cmpqw6q0WDL53ajGCMyszutvOe5toOnunbpM4jZzf+qxBOz7i0AzopZ8diBuewjmF40w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/apply-release-plan": "^7.1.1",
+        "@changesets/assemble-release-plan": "^6.0.10",
+        "@changesets/changelog-git": "^0.2.1",
+        "@changesets/config": "^3.1.4",
+        "@changesets/errors": "^0.2.0",
+        "@changesets/get-dependents-graph": "^2.1.4",
+        "@changesets/get-release-plan": "^4.0.16",
+        "@changesets/git": "^3.0.4",
+        "@changesets/logger": "^0.1.1",
+        "@changesets/pre": "^2.0.2",
+        "@changesets/read": "^0.6.7",
+        "@changesets/should-skip-package": "^0.1.2",
+        "@changesets/types": "^6.1.0",
+        "@changesets/write": "^0.4.0",
+        "@inquirer/external-editor": "^1.0.2",
+        "@manypkg/get-packages": "^1.1.3",
+        "ansi-colors": "^4.1.3",
+        "enquirer": "^2.4.1",
+        "fs-extra": "^7.0.1",
+        "mri": "^1.2.0",
+        "package-manager-detector": "^0.2.0",
+        "picocolors": "^1.1.0",
+        "resolve-from": "^5.0.0",
+        "semver": "^7.5.3",
+        "spawndamnit": "^3.0.1",
+        "term-size": "^2.1.0"
+      },
+      "bin": {
+        "changeset": "bin.js"
+      }
+    },
+    "node_modules/@changesets/config": {
+      "version": "3.1.4",
+      "resolved": "https://registry.npmjs.org/@changesets/config/-/config-3.1.4.tgz",
+      "integrity": "sha512-pf0bvD/v6WI2cRlZ6hzpjtZdSlXDXMAJ+Iz7xfFzV4ZxJ8OGGAON+1qYc99ZPrijnt4xp3VGG7eNvAOGS24V1Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/errors": "^0.2.0",
+        "@changesets/get-dependents-graph": "^2.1.4",
+        "@changesets/logger": "^0.1.1",
+        "@changesets/should-skip-package": "^0.1.2",
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "fs-extra": "^7.0.1",
+        "micromatch": "^4.0.8"
+      }
+    },
+    "node_modules/@changesets/errors": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/@changesets/errors/-/errors-0.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "extendable-error": "^0.1.5"
+      }
+    },
+    "node_modules/@changesets/get-dependents-graph": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@changesets/get-dependents-graph/-/get-dependents-graph-2.1.4.tgz",
+      "integrity": "sha512-ZsS00x6WvmHq3sQv8oCMwL0f/z3wbXCVuSVTJwCnnmbC/iBdNJGFx1EcbMG4PC6sXRyH69liM4A2WKXzn/kRPg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "picocolors": "^1.1.0",
+        "semver": "^7.5.3"
+      }
+    },
+    "node_modules/@changesets/get-github-info": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@changesets/get-github-info/-/get-github-info-0.7.0.tgz",
+      "integrity": "sha512-+i67Bmhfj9V4KfDeS1+Tz3iF32btKZB2AAx+cYMqDSRFP7r3/ZdGbjCo+c6qkyViN9ygDuBjzageuPGJtKGe5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "dataloader": "^1.4.0",
+        "node-fetch": "^2.5.0"
+      }
+    },
+    "node_modules/@changesets/get-release-plan": {
+      "version": "4.0.16",
+      "resolved": "https://registry.npmjs.org/@changesets/get-release-plan/-/get-release-plan-4.0.16.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/assemble-release-plan": "^6.0.10",
+        "@changesets/config": "^3.1.4",
+        "@changesets/pre": "^2.0.2",
+        "@changesets/read": "^0.6.7",
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3"
+      }
+    },
+    "node_modules/@changesets/get-version-range-type": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@changesets/get-version-range-type/-/get-version-range-type-0.4.0.tgz",
+      "integrity": "sha512-hwawtob9DryoGTpixy1D3ZXbGgJu1Rhr+ySH2PvTLHvkZuQ7sRT4oQwMh0hbqZH1weAooedEjRsbrWcGLCeyVQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@changesets/git": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@changesets/git/-/git-3.0.4.tgz",
+      "integrity": "sha512-BXANzRFkX+XcC1q/d27NKvlJ1yf7PSAgi8JG6dt8EfbHFHi4neau7mufcSca5zRhwOL8j9s6EqsxmT+s+/E6Sw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/errors": "^0.2.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "is-subdir": "^1.1.1",
+        "micromatch": "^4.0.8",
+        "spawndamnit": "^3.0.1"
+      }
+    },
+    "node_modules/@changesets/logger": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/@changesets/logger/-/logger-0.1.1.tgz",
+      "integrity": "sha512-OQtR36ZlnuTxKqoW4Sv6x5YIhOmClRd5pWsjZsddYxpWs517R0HkyiefQPIytCVh4ZcC5x9XaG8KTdd5iRQUfg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "picocolors": "^1.1.0"
+      }
+    },
+    "node_modules/@changesets/parse": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@changesets/parse/-/parse-0.4.3.tgz",
+      "integrity": "sha512-ZDmNc53+dXdWEv7fqIUSgRQOLYoUom5Z40gmLgmATmYR9NbL6FJJHwakcCpzaeCy+1D0m0n7mT4jj2B/MQPl7A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/types": "^6.1.0",
+        "js-yaml": "^4.1.1"
+      }
+    },
+    "node_modules/@changesets/pre": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@changesets/pre/-/pre-2.0.2.tgz",
+      "integrity": "sha512-HaL/gEyFVvkf9KFg6484wR9s0qjAXlZ8qWPDkTyKF6+zqjBe/I2mygg3MbpZ++hdi0ToqNUF8cjj7fBy0dg8Ug==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3",
+        "fs-extra": "^7.0.1"
+      }
+    },
+    "node_modules/@changesets/read": {
+      "version": "0.6.7",
+      "resolved": "https://registry.npmjs.org/@changesets/read/-/read-0.6.7.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/git": "^3.0.4",
+        "@changesets/logger": "^0.1.1",
+        "@changesets/parse": "^0.4.3",
+        "@changesets/types": "^6.1.0",
+        "fs-extra": "^7.0.1",
+        "p-filter": "^2.1.0",
+        "picocolors": "^1.1.0"
+      }
+    },
+    "node_modules/@changesets/should-skip-package": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@changesets/should-skip-package/-/should-skip-package-0.1.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/types": "^6.1.0",
+        "@manypkg/get-packages": "^1.1.3"
+      }
+    },
+    "node_modules/@changesets/types": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/@changesets/types/-/types-6.1.0.tgz",
+      "integrity": "sha512-rKQcJ+o1nKNgeoYRHKOS07tAMNd3YSN0uHaJOZYjBAgxfV7TUE7JE+z4BzZdQwb5hKaYbayKN5KrYV7ODb2rAA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@changesets/write": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@changesets/write/-/write-0.4.0.tgz",
+      "integrity": "sha512-CdTLvIOPiCNuH71pyDu3rA+Q0n65cmAbXnwWH84rKGiFumFzkmHNT8KHTMEchcxN+Kl8I54xGUhJ7l3E7X396Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@changesets/types": "^6.1.0",
+        "fs-extra": "^7.0.1",
+        "human-id": "^4.1.1",
+        "prettier": "^2.7.1"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
@@ -124,6 +403,28 @@
         "hono": "^4"
       }
     },
+    "node_modules/@inquirer/external-editor": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@inquirer/external-editor/-/external-editor-1.0.3.tgz",
+      "integrity": "sha512-RWbSrDiYmO4LbejWY7ttpxczuwQyZLBUyygsA9Nsv95hpzUWwnNTVQmAq3xuh7vNwCp07UTmE5i11XAEExx4RA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "chardet": "^2.1.1",
+        "iconv-lite": "^0.7.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@types/node": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@jridgewell/resolve-uri": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
@@ -152,6 +453,78 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@manypkg/find-root": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@manypkg/find-root/-/find-root-1.1.0.tgz",
+      "integrity": "sha512-mki5uBvhHzO8kYYix/WRy2WX8S3B5wdVSc9D6KcU5lQNglP2yt58/VfLuAK49glRXChosY8ap2oJ1qgma3GUVA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.5.5",
+        "@types/node": "^12.7.1",
+        "find-up": "^4.1.0",
+        "fs-extra": "^8.1.0"
+      }
+    },
+    "node_modules/@manypkg/find-root/node_modules/@types/node": {
+      "version": "12.20.55",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.20.55.tgz",
+      "integrity": "sha512-J8xLz7q2OFulZ2cyGTLE1TbbZcjpno7FaN6zdJNrgAdrJ+DZzh/uFR6YrTb4C+nXakvud8Q4+rbhoIWlYQbUFQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@manypkg/find-root/node_modules/fs-extra": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
+      "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "graceful-fs": "^4.2.0",
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      },
+      "engines": {
+        "node": ">=6 <7 || >=8"
+      }
+    },
+    "node_modules/@manypkg/get-packages": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@manypkg/get-packages/-/get-packages-1.1.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.5.5",
+        "@changesets/types": "^4.0.1",
+        "@manypkg/find-root": "^1.1.0",
+        "fs-extra": "^8.1.0",
+        "globby": "^11.0.0",
+        "read-yaml-file": "^1.1.0"
+      }
+    },
+    "node_modules/@manypkg/get-packages/node_modules/@changesets/types": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/@changesets/types/-/types-4.1.0.tgz",
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+      "license": "MIT"
+    },
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-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/zod": {
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
@@ -3836,7 +4769,7 @@
     },
     "src/everything": {
       "name": "@modelcontextprotocol/server-everything",
-      "version": "2.0.0",
+      "version": "1.0.0",
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.30.0",
@@ -3860,7 +4793,7 @@
     },
     "src/filesystem": {
       "name": "@modelcontextprotocol/server-filesystem",
-      "version": "0.6.3",
+      "version": "1.0.0",
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.30.0",
@@ -3883,7 +4816,7 @@
     },
     "src/memory": {
       "name": "@modelcontextprotocol/server-memory",
-      "version": "0.6.3",
+      "version": "1.0.0",
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.30.0"
@@ -3901,7 +4834,7 @@
     },
     "src/sequentialthinking": {
       "name": "@modelcontextprotocol/server-sequential-thinking",
-      "version": "0.6.2",
+      "version": "1.0.0",
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.30.0",
diff --git a/package.json b/package.json
index ab0b8c8800..4abea40d44 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,13 @@
     "build": "npm run build --workspaces",
     "watch": "npm run watch --workspaces",
     "publish-all": "npm publish --workspaces --access public",
-    "link-all": "npm link --workspaces"
+    "link-all": "npm link --workspaces",
+    "changeset": "changeset",
+    "version-packages": "changeset version"
+  },
+  "devDependencies": {
+    "@changesets/cli": "^2.29.5",
+    "@changesets/changelog-github": "^0.5.1"
   },
   "dependencies": {
     "@modelcontextprotocol/server-everything": "*",
diff --git a/scripts/prepare_python_release.py b/scripts/prepare_python_release.py
new file mode 100644
index 0000000000..67eb2b5df8
--- /dev/null
+++ b/scripts/prepare_python_release.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env uv run --script
+# /// script
+# requires-python = ">=3.12"
+# dependencies = [
+#     "tomlkit>=0.13.2"
+# ]
+# ///
+"""Stamp today's CalVer date onto Python packages that changed since their last version bump.
+
+Used by the prepare-release workflow (see RELEASING.md). The TypeScript packages
+are versioned by changesets and are not touched by this script.
+
+For each src/*/pyproject.toml:
+  1. Find the last commit that changed the `version` field.
+  2. If any .py, .md, or pyproject.toml file in the package changed since then,
+     set the version to today's date (CalVer, e.g. 2026.8.1) and refresh uv.lock.
+
+Publishing stays safe regardless: release.yml only publishes versions that are
+not already on the registry.
+"""
+
+import argparse
+import datetime
+import subprocess
+import sys
+from pathlib import Path
+
+import tomlkit
+
+RELEVANT_SUFFIXES = {".py", ".md"}  # .md counts: READMEs ship in the sdist
+
+
+def git(args: list[str], cwd: Path) -> str:
+    return subprocess.run(
+        ["git", *args], cwd=cwd, check=True, capture_output=True, text=True
+    ).stdout.strip()
+
+
+def last_version_bump_commit(package_dir: Path) -> str | None:
+    """The most recent commit that changed the version line in pyproject.toml."""
+    output = git(
+        ["log", "-1", "--format=%H", "-G", r"^version\s*=", "--", "pyproject.toml"],
+        cwd=package_dir,
+    )
+    return output or None
+
+
+def has_relevant_changes(package_dir: Path, since_commit: str) -> bool:
+    output = git(["diff", "--name-only", since_commit, "--", "."], cwd=package_dir)
+    for line in output.splitlines():
+        path = Path(line)
+        if path.suffix in RELEVANT_SUFFIXES or path.name == "pyproject.toml":
+            return True
+    return False
+
+
+def stamp_version(package_dir: Path, version: str) -> None:
+    pyproject = package_dir / "pyproject.toml"
+    data = tomlkit.parse(pyproject.read_text())
+    data["project"]["version"] = version  # type: ignore[index]
+    pyproject.write_text(tomlkit.dumps(data))
+    # Refresh uv.lock to match the updated pyproject.toml
+    subprocess.run(["uv", "lock"], cwd=package_dir, check=True)
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--directory", type=Path, default=Path("src"))
+    args = parser.parse_args()
+
+    directory = args.directory.resolve(strict=True)
+    today = datetime.date.today()
+    version = f"{today.year}.{today.month}.{today.day}"
+
+    stamped = []
+    for pyproject in sorted(directory.glob("*/pyproject.toml")):
+        package_dir = pyproject.parent
+        data = tomlkit.parse(pyproject.read_text())
+        name = str(data["project"]["name"])  # type: ignore[index]
+        current = str(data["project"]["version"])  # type: ignore[index]
+
+        if current == version:
+            print(f"{name}: already at {version}, skipping", file=sys.stderr)
+            continue
+
+        since = last_version_bump_commit(package_dir)
+        # No version-bump commit found (shouldn't happen with full history):
+        # stamp anyway — release.yml's registry guard makes over-stamping harmless.
+        if since is not None and not has_relevant_changes(package_dir, since):
+            print(f"{name}: no changes since {current}, skipping", file=sys.stderr)
+            continue
+
+        stamp_version(package_dir, version)
+        stamped.append(f"{name}: {current} -> {version}")
+        print(f"{name}: {current} -> {version}", file=sys.stderr)
+
+    # stdout is the machine-readable summary (used as the PR body)
+    for line in stamped:
+        print(line)
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/scripts/release.py b/scripts/release.py
deleted file mode 100755
index b3dcf0c1e2..0000000000
--- a/scripts/release.py
+++ /dev/null
@@ -1,215 +0,0 @@
-#!/usr/bin/env uv run --script
-# /// script
-# requires-python = ">=3.12"
-# dependencies = [
-#     "click>=8.1.8",
-#     "tomlkit>=0.13.2"
-# ]
-# ///
-import sys
-import re
-import click
-from pathlib import Path
-import json
-import tomlkit
-import datetime
-import subprocess
-from dataclasses import dataclass
-from typing import Any, Iterator, NewType, Protocol
-
-
-Version = NewType("Version", str)
-GitHash = NewType("GitHash", str)
-
-
-class GitHashParamType(click.ParamType):
-    name = "git_hash"
-
-    def convert(
-        self, value: Any, param: click.Parameter | None, ctx: click.Context | None
-    ) -> GitHash | None:
-        if value is None:
-            return None
-
-        if not (8 <= len(value) <= 40):
-            self.fail(f"Git hash must be between 8 and 40 characters, got {len(value)}")
-
-        if not re.match(r"^[0-9a-fA-F]+$", value):
-            self.fail("Git hash must contain only hex digits (0-9, a-f)")
-
-        try:
-            # Verify hash exists in repo
-            subprocess.run(
-                ["git", "rev-parse", "--verify", value], check=True, capture_output=True
-            )
-        except subprocess.CalledProcessError:
-            self.fail(f"Git hash {value} not found in repository")
-
-        return GitHash(value.lower())
-
-
-GIT_HASH = GitHashParamType()
-
-
-class Package(Protocol):
-    path: Path
-
-    def package_name(self) -> str: ...
-
-    def update_version(self, version: Version) -> None: ...
-
-
-@dataclass
-class NpmPackage:
-    path: Path
-
-    def package_name(self) -> str:
-        with open(self.path / "package.json", "r") as f:
-            return json.load(f)["name"]
-
-    def update_version(self, version: Version):
-        with open(self.path / "package.json", "r+") as f:
-            data = json.load(f)
-            data["version"] = version
-            f.seek(0)
-            json.dump(data, f, indent=2)
-            f.truncate()
-
-
-@dataclass
-class PyPiPackage:
-    path: Path
-
-    def package_name(self) -> str:
-        with open(self.path / "pyproject.toml") as f:
-            toml_data = tomlkit.parse(f.read())
-            name = toml_data.get("project", {}).get("name")
-            if not name:
-                raise Exception("No name in pyproject.toml project section")
-            return str(name)
-
-    def update_version(self, version: Version):
-        # Update version in pyproject.toml
-        with open(self.path / "pyproject.toml") as f:
-            data = tomlkit.parse(f.read())
-            data["project"]["version"] = version
-
-        with open(self.path / "pyproject.toml", "w") as f:
-            f.write(tomlkit.dumps(data))
-
-        # Regenerate uv.lock to match the updated pyproject.toml
-        subprocess.run(["uv", "lock"], cwd=self.path, check=True)
-
-
-def has_changes(path: Path, git_hash: GitHash) -> bool:
-    """Check if any files changed between current state and git hash"""
-    try:
-        output = subprocess.run(
-            ["git", "diff", "--name-only", git_hash, "--", "."],
-            cwd=path,
-            check=True,
-            capture_output=True,
-            text=True,
-        )
-
-        changed_files = [Path(f) for f in output.stdout.splitlines()]
-        # .md counts as a change: READMEs ship inside the published package
-        # (npm tarball / PyPI long_description)
-        relevant_files = [f for f in changed_files if f.suffix in [".py", ".ts", ".md"]]
-        return len(relevant_files) >= 1
-    except subprocess.CalledProcessError:
-        return False
-
-
-def gen_version() -> Version:
-    """Generate version based on current date"""
-    now = datetime.datetime.now()
-    return Version(f"{now.year}.{now.month}.{now.day}")
-
-
-def find_changed_packages(directory: Path, git_hash: GitHash) -> Iterator[Package]:
-    for path in directory.glob("*/package.json"):
-        if has_changes(path.parent, git_hash):
-            yield NpmPackage(path.parent)
-    for path in directory.glob("*/pyproject.toml"):
-        if has_changes(path.parent, git_hash):
-            yield PyPiPackage(path.parent)
-
-
-@click.group()
-def cli():
-    pass
-
-
-@cli.command("update-packages")
-@click.option(
-    "--directory", type=click.Path(exists=True, path_type=Path), default=Path.cwd()
-)
-@click.argument("git_hash", type=GIT_HASH)
-def update_packages(directory: Path, git_hash: GitHash) -> int:
-    # Detect package type
-    path = directory.resolve(strict=True)
-    version = gen_version()
-
-    for package in find_changed_packages(path, git_hash):
-        name = package.package_name()
-        package.update_version(version)
-
-        click.echo(f"{name}@{version}")
-
-    return 0
-
-
-@cli.command("generate-notes")
-@click.option(
-    "--directory", type=click.Path(exists=True, path_type=Path), default=Path.cwd()
-)
-@click.argument("git_hash", type=GIT_HASH)
-def generate_notes(directory: Path, git_hash: GitHash) -> int:
-    # Detect package type
-    path = directory.resolve(strict=True)
-    version = gen_version()
-
-    click.echo(f"# Release : v{version}")
-    click.echo("")
-    click.echo("## Updated packages")
-    for package in find_changed_packages(path, git_hash):
-        name = package.package_name()
-        click.echo(f"- {name}@{version}")
-
-    return 0
-
-
-@cli.command("generate-version")
-def generate_version() -> int:
-    # Detect package type
-    click.echo(gen_version())
-    return 0
-
-
-@cli.command("generate-matrix")
-@click.option(
-    "--directory", type=click.Path(exists=True, path_type=Path), default=Path.cwd()
-)
-@click.option("--npm", is_flag=True, default=False)
-@click.option("--pypi", is_flag=True, default=False)
-@click.argument("git_hash", type=GIT_HASH)
-def generate_matrix(directory: Path, git_hash: GitHash, pypi: bool, npm: bool) -> int:
-    # Detect package type
-    path = directory.resolve(strict=True)
-    version = gen_version()
-
-    changes = []
-    for package in find_changed_packages(path, git_hash):
-        pkg = package.path.relative_to(path)
-        if npm and isinstance(package, NpmPackage):
-            changes.append(str(pkg))
-        if pypi and isinstance(package, PyPiPackage):
-            changes.append(str(pkg))
-
-    click.echo(json.dumps(changes))
-    return 0
-
-
-if __name__ == "__main__":
-    sys.exit(cli())
diff --git a/src/everything/package.json b/src/everything/package.json
index 745d1b10bb..2f6ad48125 100644
--- a/src/everything/package.json
+++ b/src/everything/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/server-everything",
-  "version": "2.0.0",
+  "version": "1.0.0",
   "description": "MCP server that exercises all the features of the MCP protocol",
   "license": "SEE LICENSE IN LICENSE",
   "mcpName": "io.github.modelcontextprotocol/server-everything",
diff --git a/src/everything/server/index.ts b/src/everything/server/index.ts
index f1459cc812..327a47cae6 100644
--- a/src/everything/server/index.ts
+++ b/src/everything/server/index.ts
@@ -47,7 +47,7 @@ export const createServer: () => ServerFactoryResponse = () => {
     {
       name: "mcp-servers/everything",
       title: "Everything Reference Server",
-      version: "2.0.0",
+      version: "1.0.0",
     },
     {
       capabilities: {
diff --git a/src/filesystem/index.ts b/src/filesystem/index.ts
index 234605bb13..cddb712c1b 100644
--- a/src/filesystem/index.ts
+++ b/src/filesystem/index.ts
@@ -163,7 +163,7 @@ const GetFileInfoArgsSchema = z.object({
 const server = new McpServer(
   {
     name: "secure-filesystem-server",
-    version: "0.2.0",
+    version: "1.0.0",
   }
 );
 
diff --git a/src/filesystem/package.json b/src/filesystem/package.json
index 139c4f00b4..a0fdc8807e 100644
--- a/src/filesystem/package.json
+++ b/src/filesystem/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/server-filesystem",
-  "version": "0.6.3",
+  "version": "1.0.0",
   "description": "MCP server for filesystem access",
   "license": "SEE LICENSE IN LICENSE",
   "mcpName": "io.github.modelcontextprotocol/server-filesystem",
diff --git a/src/memory/index.ts b/src/memory/index.ts
index 9865c5318e..4de0fd5ed8 100644
--- a/src/memory/index.ts
+++ b/src/memory/index.ts
@@ -256,7 +256,7 @@ const RelationSchema = z.object({
 // The server instance and tools exposed to Claude
 const server = new McpServer({
   name: "memory-server",
-  version: "0.6.3",
+  version: "1.0.0",
 });
 
 const RESOURCE_URI = "memory://knowledge-graph";
diff --git a/src/memory/package.json b/src/memory/package.json
index 4fdcd3f9a4..39d9a6ee10 100644
--- a/src/memory/package.json
+++ b/src/memory/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/server-memory",
-  "version": "0.6.3",
+  "version": "1.0.0",
   "description": "MCP server for enabling memory for Claude through a knowledge graph",
   "license": "SEE LICENSE IN LICENSE",
   "mcpName": "io.github.modelcontextprotocol/server-memory",
@@ -34,4 +34,4 @@
     "typescript": "^5.6.2",
     "vitest": "^4.1.8"
   }
-}
\ No newline at end of file
+}
diff --git a/src/sequentialthinking/index.ts b/src/sequentialthinking/index.ts
index 217845bb3d..98e3a34208 100644
--- a/src/sequentialthinking/index.ts
+++ b/src/sequentialthinking/index.ts
@@ -17,7 +17,7 @@ const coercedBoolean = z.preprocess((val) => {
 
 const server = new McpServer({
   name: "sequential-thinking-server",
-  version: "0.2.0",
+  version: "1.0.0",
 });
 
 const thinkingServer = new SequentialThinkingServer();
diff --git a/src/sequentialthinking/package.json b/src/sequentialthinking/package.json
index 03fbb2b361..e53f95508e 100644
--- a/src/sequentialthinking/package.json
+++ b/src/sequentialthinking/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/server-sequential-thinking",
-  "version": "0.6.2",
+  "version": "1.0.0",
   "description": "MCP server for sequential thinking and problem solving",
   "license": "SEE LICENSE IN LICENSE",
   "mcpName": "io.github.modelcontextprotocol/server-sequential-thinking",
@@ -37,4 +37,4 @@
     "typescript": "^5.3.3",
     "vitest": "^4.1.8"
   }
-}
\ No newline at end of file
+}