Implement MCP 2026-07-28 (#2286)

Co-authored-by: Matt <77928207+mattzcarey@users.noreply.github.com>
Co-authored-by: Konstantin Konstantinov <KKonstantinov@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/workflows/conformance.yml

@@ -2,7 +2,7 @@ name: Conformance Tests
 
 on:
     push:
-        branches: [main]
+        branches: [main, v2-2026-07-28]
     pull_request:
     workflow_dispatch:
 
@@ -30,6 +30,7 @@ jobs:
             - run: pnpm install
             - run: pnpm run build:all
             - run: pnpm run test:conformance:client:all
+            - run: pnpm --filter @modelcontextprotocol/test-conformance run test:conformance:client:2026
 
     server-conformance:
         runs-on: ubuntu-latest
@@ -48,3 +49,5 @@ jobs:
             - run: pnpm run build:all
             - run: pnpm run test:conformance:server
             - run: pnpm run test:conformance:server:draft
+            - run: pnpm run test:conformance:server:extensions
+            - run: pnpm --filter @modelcontextprotocol/test-conformance run test:conformance:server:2026

.github/workflows/examples.yml

@@ -0,0 +1,47 @@
+name: Examples
+
+on:
+    push:
+        branches:
+            - main
+            - v2-2026-07-28
+    pull_request:
+    workflow_dispatch:
+
+permissions:
+    contents: read
+
+concurrency:
+    group: ${{ github.workflow }}-${{ github.ref }}
+    cancel-in-progress: true
+
+jobs:
+    # Builds the workspace + examples and e2e-runs every examples/<story>/ pair
+    # over every transport it supports. Each client.ts is a self-verifying test
+    # (asserts and exits non-zero on any mismatch). This is part of the per-PR
+    # gate basket — a red examples run blocks merge.
+    examples:
+        name: examples (build + e2e)
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v6
+
+            - name: Install pnpm
+              uses: pnpm/action-setup@fc06bc1257f339d1d5d8b3a19a8cae5388b55320 # v5.0.0
+              with:
+                  run_install: false
+
+            - uses: actions/setup-node@v6
+              with:
+                  node-version: 24
+                  cache: pnpm
+                  cache-dependency-path: pnpm-lock.yaml
+
+            - run: pnpm install
+
+            # The workspace packages the examples import resolve to built dists
+            # (the gap that killed an earlier examples smoke suite).
+            - run: pnpm run build:all
+
+            - name: Run all example pairs (transport × era)
+              run: pnpm tsx scripts/examples/run-examples.ts

.github/workflows/main.yml

@@ -2,6 +2,7 @@ on:
     push:
         branches:
             - main
+            - v2-2026-07-28
     pull_request:
     workflow_dispatch:
 

.github/workflows/update-spec-types.yml

@@ -1,3 +1,14 @@
+# Nightly refresh of the draft-tracking spec anchor (2026-07-28).
+#
+# Anchor lifecycle (see packages/core-internal/src/types/README.md for the full policy):
+# - Draft anchors float: this job regenerates the draft-tracking anchor from the
+#   latest upstream draft schema and, on drift, opens a refresh PR for review.
+#   It only ever proposes — it never merges.
+# - Released anchors are frozen: generation for released revisions is pinned in
+#   scripts/fetch-spec-types.ts (RELEASED_REVISION_PINS) and is not refreshed by
+#   this job. Repinning a released revision — including the freeze of a newly
+#   published revision, when its schema moves out of schema/draft/ — must land
+#   in the same commit that retargets this workflow.
 name: Update Spec Types
 
 on: