diff --git a/.github/workflows/mantis-telegram-desktop-proof.yml b/.github/workflows/mantis-telegram-desktop-proof.yml
index 6c9501b23e25..be8fb202f13a 100644
--- a/.github/workflows/mantis-telegram-desktop-proof.yml
+++ b/.github/workflows/mantis-telegram-desktop-proof.yml
@@ -554,14 +554,14 @@ jobs:
         id: baseline_build_cache
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
-          path: .artifacts/mantis-baseline-build.tar
-          key: ${{ runner.os }}-${{ runner.arch }}-mantis-baseline-v3-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-${{ needs.resolve_request.outputs.baseline_revision }}
+          path: .artifacts/mantis-runtime-build.tar
+          key: ${{ runner.os }}-${{ runner.arch }}-mantis-runtime-v1-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-${{ needs.resolve_request.outputs.baseline_revision }}
           restore-keys: |
-            ${{ runner.os }}-${{ runner.arch }}-mantis-baseline-v3-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-
+            ${{ runner.os }}-${{ runner.arch }}-mantis-runtime-v1-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-
 
       - name: Prepare baseline and candidate proof builds
         env:
-          BASELINE_BUILD_ARCHIVE: ${{ github.workspace }}/.artifacts/mantis-baseline-build.tar
+          BASELINE_BUILD_ARCHIVE: ${{ github.workspace }}/.artifacts/mantis-runtime-build.tar
           BASELINE_BUILD_CACHE_HIT: ${{ steps.baseline_build_cache.outputs.cache-hit }}
           BASELINE_SHA: ${{ needs.resolve_request.outputs.baseline_revision }}
           CANDIDATE_SHA: ${{ steps.proof_worktrees.outputs.candidate_revision }}
@@ -590,8 +590,8 @@ jobs:
               pnpm-lock.yaml \
               pnpm-workspace.yaml \
               tsconfig.json; then
-            # Observed 2026-08: cache-only seeding still rebuilt tsdown-unified for 3m04s;
-            # its cache contract also requires the live plugin-SDK outputs it will replace.
+            # The runtime graph always rebuilds; seed only trusted build metadata and
+            # live plugin-SDK outputs when the candidate kept the cache engine intact.
             tar --no-same-owner -C "$candidate_root" -xf "$BASELINE_BUILD_ARCHIVE" \
               .artifacts/build-all-cache dist/plugin-sdk
             test -z "$(find "$candidate_root/.artifacts/build-all-cache" -type l -print -quit)"
@@ -625,9 +625,11 @@ jobs:
                 HOME="${RUNNER_TEMP}/mantis-baseline-home" \
                 OPENCLAW_BUILD_PRIVATE_QA=1 \
                 OPENCLAW_ENABLE_PRIVATE_QA_CLI=1 \
+                OPENCLAW_RUN_NODE_SKIP_DTS_BUILD=1 \
                 PATH="$toolchain_dir:/usr/bin:/bin" \
                 "$toolchain_dir/pnpm" build
               mkdir -p "$(dirname "$BASELINE_BUILD_ARCHIVE")"
+              mkdir -p "$baseline_root/.artifacts/build-all-cache"
               baseline_archive_new="${BASELINE_BUILD_ARCHIVE}.new"
               test ! -e "$baseline_archive_new"
               tar -cf "$baseline_archive_new" \
@@ -642,18 +644,6 @@ jobs:
             test -f dist/control-ui/index.html
             test -f dist/index.js -o -f dist/index.mjs
             build_cache_root="$baseline_root/.artifacts/build-all-cache"
-            for phase in tsdown-ai tsdown-packages tsdown-unified; do
-              stamp="$build_cache_root/$phase/stamp.json"
-              outputs="$build_cache_root/$phase/outputs"
-              test -s "$stamp"
-              jq -e '
-                (.version | type) == "number" and
-                (.signature | type) == "string" and (.signature | length) == 64 and
-                (.outputs | type) == "array" and (.outputs | length) > 0
-              ' "$stamp" >/dev/null
-              test -d "$outputs"
-              test -n "$(find "$outputs" -type f -print -quit)"
-            done
             test -z "$(find "$build_cache_root" -type l -print -quit)"
             test -z "$(find "$build_cache_root" -type f -links +1 -print -quit)"
           }
@@ -692,7 +682,7 @@ jobs:
         continue-on-error: true
         uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
-          path: .artifacts/mantis-baseline-build.tar
+          path: .artifacts/mantis-runtime-build.tar
           key: ${{ steps.baseline_build_cache.outputs.cache-primary-key }}
 
       - name: Install TDLib and restore Telegram QA user
diff --git a/scripts/build-all.mts b/scripts/build-all.mts
index f3c1ba8c39ea..8f3ff37c869d 100644
--- a/scripts/build-all.mts
+++ b/scripts/build-all.mts
@@ -63,6 +63,7 @@ type BuildAllStepParams = {
 };
 type BuildAllCacheParams = { rootDir?: string; fs?: BuildAllFs; env?: NodeJS.ProcessEnv };
 const BUILD_CACHE_VERSION = 4;
+const RUN_NODE_SKIP_DTS_BUILD_ENV = "OPENCLAW_RUN_NODE_SKIP_DTS_BUILD";
 const TSDOWN_DECLARATION_EXTENSIONS = [".d.ts", ".d.mts", ".d.cts"];
 const TSDOWN_SOURCE_EXTENSIONS = [
   ".cjs",
@@ -362,8 +363,25 @@ export const BUILD_ALL_PROFILES: Record<string, string[]> = {
   ],
 };
 
+const FULL_RUNTIME_ONLY_STEPS = [
+  "plugins:assets:build",
+  "tsdown",
+  "external-plugins:local-dist",
+  "check-cli-bootstrap-imports",
+  "plugins:assets:copy",
+  "runtime-postbuild",
+  "build-stamp",
+  "runtime-postbuild-stamp",
+  "ui:build",
+  "write-build-info",
+  "write-cli-startup-metadata",
+];
+
 export const BUILD_ALL_PROFILE_STEP_ENV: Record<string, Record<string, NodeJS.ProcessEnv>> = {
   full: {
+    tsdown: {
+      OPENCLAW_PRESERVE_CLI_STARTUP_METADATA: "1",
+    },
     "tsdown-unified": {
       OPENCLAW_PRESERVE_CLI_STARTUP_METADATA: "1",
     },
@@ -449,11 +467,20 @@ export function parseBuildAllArgs(argv: string[]) {
   return args;
 }
 
-export function resolveBuildAllSteps(profile = "full"): BuildAllStep[] {
-  const labels = BUILD_ALL_PROFILES[profile];
-  if (!labels) {
+export function resolveBuildAllSteps(
+  profile = "full",
+  buildEnv: NodeJS.ProcessEnv = process.env,
+): BuildAllStep[] {
+  const profileLabels = BUILD_ALL_PROFILES[profile];
+  if (!profileLabels) {
     throw new Error(`Unknown build profile: ${profile}`);
   }
+  // A cold runtime-only build has no declarations for the canonical SDK gates.
+  // Keep the full runtime artifact surface, but use the uncached runtime graph.
+  const labels =
+    profile === "full" && buildEnv[RUN_NODE_SKIP_DTS_BUILD_ENV] === "1"
+      ? FULL_RUNTIME_ONLY_STEPS
+      : profileLabels;
   const selected = labels.map((label) => BUILD_ALL_STEPS.find((step) => step.label === label));
   if (selected.some((step) => !step)) {
     const missing = labels.filter((label) => !BUILD_ALL_STEPS.some((step) => step.label === label));
@@ -950,7 +977,7 @@ if (isMainModule()) {
     const buildEnv = resolveBuildAllEnvironment();
     const timings: BuildAllTiming[] = [];
     let exitCode = 0;
-    for (const step of resolveBuildAllSteps(args.profile)) {
+    for (const step of resolveBuildAllSteps(args.profile, buildEnv)) {
       const startedAt = performance.now();
       const cacheState = resolveBuildAllStepCacheState(step, { env: buildEnv });
       let stepToRun = step;
diff --git a/scripts/mantis/mantis-sut-container.sh b/scripts/mantis/mantis-sut-container.sh
index cff95affc5f6..85cb2dcbf030 100644
--- a/scripts/mantis/mantis-sut-container.sh
+++ b/scripts/mantis/mantis-sut-container.sh
@@ -605,7 +605,7 @@ readonly build_command='
   }
   trap cleanup EXIT INT TERM
   corepack pnpm install --frozen-lockfile --store-dir "$store"
-  corepack pnpm build
+  OPENCLAW_RUN_NODE_SKIP_DTS_BUILD=1 corepack pnpm build
 '
 
 run_network_probe() {
diff --git a/test/scripts/build-all.test.ts b/test/scripts/build-all.test.ts
index edea75255b43..8a07476d3106 100644
--- a/test/scripts/build-all.test.ts
+++ b/test/scripts/build-all.test.ts
@@ -587,6 +587,30 @@ describe("resolveBuildAllSteps", () => {
     ]);
   });
 
+  it("uses the full runtime artifact surface without declaration work when DTS is disabled", () => {
+    const steps = resolveBuildAllSteps("full", {
+      OPENCLAW_RUN_NODE_SKIP_DTS_BUILD: "1",
+    });
+    const labels = steps.map((step) => step.label);
+
+    expect(labels).toEqual([
+      "plugins:assets:build",
+      "tsdown",
+      "external-plugins:local-dist",
+      "check-cli-bootstrap-imports",
+      "plugins:assets:copy",
+      "runtime-postbuild",
+      "build-stamp",
+      "runtime-postbuild-stamp",
+      "ui:build",
+      "write-build-info",
+      "write-cli-startup-metadata",
+    ]);
+    expect(steps.find((step) => step.label === "tsdown")?.cache).toBeUndefined();
+    expect(labels).not.toContain("write-plugin-sdk-entry-dts");
+    expect(labels).not.toContain("check-plugin-sdk-exports");
+  });
+
   it("uses a source performance profile with QA assets and immutable build provenance", () => {
     expect(resolveBuildAllSteps("sourcePerformance").map((step) => step.label)).toEqual([
       "plugins:assets:build",
@@ -1121,27 +1145,32 @@ describe("resolveBuildAllStepCacheState", () => {
     });
   });
 
-  it("marks cacheable steps stale when a tracked env input changes", () => {
+  it("never reuses a runtime-only cache as a declaration-complete full-build cache", () => {
     withBuildCacheFixture(({ rootDir, step }) => {
       const envStep = {
         ...step,
         cache: {
           ...step.cache,
-          env: ["OPENCLAW_BUILD_PRIVATE_QA"],
+          env: ["OPENCLAW_RUN_NODE_SKIP_DTS_BUILD"],
+          restore: "always" as const,
         },
       };
       const cacheState = resolveBuildAllStepCacheState(envStep, {
         rootDir,
-        env: { OPENCLAW_BUILD_PRIVATE_QA: "0" },
+        env: { OPENCLAW_RUN_NODE_SKIP_DTS_BUILD: "1" },
+      });
+      writeBuildAllStepCacheStamp(envStep, cacheState, {
+        rootDir,
+        env: { OPENCLAW_RUN_NODE_SKIP_DTS_BUILD: "1" },
       });
-      writeBuildAllStepCacheStamp(envStep, cacheState, { rootDir });
 
       const stale = resolveBuildAllStepCacheState(envStep, {
         rootDir,
-        env: { OPENCLAW_BUILD_PRIVATE_QA: "1" },
+        env: {},
       });
       expect(stale.cacheable).toBe(true);
       expect(stale.fresh).toBe(false);
+      expect(stale.restorable).toBe(false);
       expect(stale.reason).toBe("stale");
     });
   });
diff --git a/test/scripts/mantis-telegram-desktop-proof-workflow.test.ts b/test/scripts/mantis-telegram-desktop-proof-workflow.test.ts
index cbb02ae9bff3..2d55e769469e 100644
--- a/test/scripts/mantis-telegram-desktop-proof-workflow.test.ts
+++ b/test/scripts/mantis-telegram-desktop-proof-workflow.test.ts
@@ -901,12 +901,13 @@ describe("Mantis Telegram Desktop proof workflow", () => {
     expect(restore.with?.key).toContain("steps.proof_worktrees.outputs.lockfile_sha256");
     expect(restore.with?.key).toContain("steps.proof_worktrees.outputs.node_version");
     expect(restore.with?.key).toContain("steps.proof_worktrees.outputs.pnpm_version");
-    expect(restore.with?.key).toContain("mantis-baseline-v3");
+    expect(restore.with?.key).toContain("mantis-runtime-v1");
     expect(restore.with?.key).toMatch(/pnpm_version.*baseline_revision/u);
     expect(restore.with?.["restore-keys"]).toBe(
-      "${{ runner.os }}-${{ runner.arch }}-mantis-baseline-v3-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-\n",
+      "${{ runner.os }}-${{ runner.arch }}-mantis-runtime-v1-${{ steps.proof_worktrees.outputs.lockfile_sha256 }}-${{ steps.proof_worktrees.outputs.node_version }}-${{ steps.proof_worktrees.outputs.pnpm_version }}-\n",
     );
-    expect(restore.with?.path).toBe(".artifacts/mantis-baseline-build.tar");
+    expect(restore.with?.path).toBe(".artifacts/mantis-runtime-build.tar");
+    expect(setup.with?.["build-all-cache-scope"]).toBeUndefined();
     expect(builds.if).toBeUndefined();
     expect(builds.env?.HOST_PNPM_STORE).toBe(
       "${{ steps.setup-node-env.outputs.pnpm-store-cache-path }}",
@@ -916,10 +917,13 @@ describe("Mantis Telegram Desktop proof workflow", () => {
     expect(buildRun).toContain("baseline_archive_restored=true");
     expect(buildRun).toContain('"$toolchain_dir/pnpm" install --frozen-lockfile');
     expect(buildRun).toContain('if [[ "$BASELINE_BUILD_CACHE_HIT" != "true" ]]');
-    expect(buildRun).toContain('"$toolchain_dir/pnpm" build');
+    expect(buildRun).toMatch(
+      /OPENCLAW_RUN_NODE_SKIP_DTS_BUILD=1 \\\n\s+PATH="\$toolchain_dir:\/usr\/bin:\/bin" \\\n\s+"\$toolchain_dir\/pnpm" build/u,
+    );
     expect(buildRun).toContain('mv -T "$baseline_archive_new" "$BASELINE_BUILD_ARCHIVE"');
+    expect(buildRun).toContain('mkdir -p "$baseline_root/.artifacts/build-all-cache"');
     expect(buildRun).toContain(".artifacts/build-all-cache");
-    expect(buildRun).toContain("for phase in tsdown-ai tsdown-packages tsdown-unified");
+    expect(buildRun).not.toContain("for phase in tsdown-ai tsdown-packages tsdown-unified");
     expect(buildRun).toContain("-type f -links +1");
     expect(save.if).toContain("steps.baseline_build_cache.outputs.cache-hit != 'true'");
     expect(save.uses).toContain("actions/cache/save@");
@@ -1253,6 +1257,8 @@ describe("Mantis Telegram Desktop proof workflow", () => {
     expect(wrapper).toContain("--memory 8g");
     expect(wrapper).toContain("--cpus 4");
     expect(wrapper).toContain("--memory 16g");
+    expect(wrapper).toContain("OPENCLAW_RUN_NODE_SKIP_DTS_BUILD=1 corepack pnpm build");
+    expect(wrapper).not.toContain("\n  corepack pnpm build\n");
     expect(sutScript).not.toContain("CODEX_HOME");
     expect(sutScript).not.toContain("codexProxyPort");
     expect(wrapper).toContain('connects("runner-host", 9)');