diff --git a/.github/scripts/supply-chain-policy.test.mjs b/.github/scripts/supply-chain-policy.test.mjs
index 695b2b3b80..28cdc86e82 100644
--- a/.github/scripts/supply-chain-policy.test.mjs
+++ b/.github/scripts/supply-chain-policy.test.mjs
@@ -171,9 +171,9 @@ test('dependency graph generation is immutable, fail closed, and wrapper validat
   const source = `${prSource}\n${trustedSource}`;
   const actionReferences = source.match(/gradle\/actions\/dependency-submission@[0-9a-f]{40} # v\d+\.\d+\.\d+/g);
 
-  assert.equal(actionReferences?.length, 2);
-  assert.equal((source.match(/dependency-graph-continue-on-failure:\s*false/g) ?? []).length, 2);
-  assert.equal((source.match(/validate-wrappers:\s*true/g) ?? []).length, 2);
+  assert.equal(actionReferences?.length, 3);
+  assert.equal((source.match(/dependency-graph-continue-on-failure:\s*false/g) ?? []).length, 3);
+  assert.equal((source.match(/validate-wrappers:\s*true/g) ?? []).length, 3);
   assert.match(prSource, /dependency-graph:\s*generate-and-upload/);
   assert.equal(workflowName(prSource), 'Generate PR Dependency Graph');
   assert.doesNotMatch(prSource, /^  push:/m);
@@ -184,6 +184,32 @@ test('dependency graph generation is immutable, fail closed, and wrapper validat
   assert.doesNotMatch(trustedSource, /^    paths:/m);
 });
 
+test('manual dependency baseline is hard-wired to the checked-out main SHA', async () => {
+  const source = await readFile(
+    new URL('../workflows/dependency-submission-trusted.yml', import.meta.url),
+    'utf8',
+  );
+  const manualJob = /^  submit-main-baseline:\n[\s\S]+$/m.exec(source)?.[0];
+
+  assert.match(source, /^  workflow_dispatch:\s*$/m);
+  assert.doesNotMatch(source, /^  workflow_dispatch:\n    inputs:/m);
+  assert.match(
+    source,
+    /github\.event_name == 'workflow_dispatch' && 'refs\/heads\/main' \|\| github\.ref/,
+  );
+  assert.ok(manualJob);
+  assert.match(
+    manualJob,
+    /if:\s*github\.event_name == 'workflow_dispatch' && github\.ref == 'refs\/heads\/develop'/,
+  );
+  assert.match(manualJob, /GITHUB_DEPENDENCY_GRAPH_REF:\s*refs\/heads\/main/);
+  assert.match(manualJob, /^          ref:\s*refs\/heads\/main$/m);
+  assert.match(manualJob, /snapshot_sha="\$\(git rev-parse HEAD\)"/);
+  assert.match(manualJob, /GITHUB_DEPENDENCY_GRAPH_SHA=\$snapshot_sha/);
+  assert.match(manualJob, /dependency-graph:\s*generate-and-submit/);
+  assert.doesNotMatch(manualJob, /inputs\./);
+});
+
 test('dependency PR workflows use the same complete server-side path filter', async () => {
   const submission = await readFile(
     new URL('../workflows/dependency-submission.yml', import.meta.url),
diff --git a/.github/workflows/dependency-submission-trusted.yml b/.github/workflows/dependency-submission-trusted.yml
index aff3ff7dbf..48b065a630 100644
--- a/.github/workflows/dependency-submission-trusted.yml
+++ b/.github/workflows/dependency-submission-trusted.yml
@@ -6,9 +6,10 @@ name: Submit Trusted Branch Dependency Graph
 on:
   push:
     branches: [develop, main]
+  workflow_dispatch:
 
 concurrency:
-  group: trusted-branch-dependency-submission-${{ github.ref }}
+  group: trusted-branch-dependency-submission-${{ github.event_name == 'workflow_dispatch' && 'refs/heads/main' || github.ref }}
   cancel-in-progress: true
 
 permissions:
@@ -16,6 +17,7 @@ permissions:
 
 jobs:
   submit-trusted-branch:
+    if: github.event_name == 'push'
     name: Submit trusted branch dependency graph
     runs-on: ubuntu-latest
     permissions:
@@ -43,3 +45,44 @@ jobs:
           dependency-graph: generate-and-submit
           dependency-graph-continue-on-failure: false
           validate-wrappers: true
+
+  submit-main-baseline:
+    if: github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/develop'
+    name: Submit main dependency graph baseline
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    env:
+      # 임의 입력을 받지 않고 실제 checkout 한 main HEAD 에만 기준선을 귀속한다.
+      GITHUB_DEPENDENCY_GRAPH_JOB_CORRELATOR: afternote-gradle-dependency-graph
+      GITHUB_DEPENDENCY_GRAPH_REF: refs/heads/main
+    steps:
+      - name: Clone main
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: refs/heads/main
+          persist-credentials: false
+
+      - name: Bind snapshot to checked-out main SHA
+        id: main-snapshot
+        shell: bash
+        run: |
+          snapshot_sha="$(git rev-parse HEAD)"
+          echo "sha=$snapshot_sha" >> "$GITHUB_OUTPUT"
+          echo "GITHUB_DEPENDENCY_GRAPH_SHA=$snapshot_sha" >> "$GITHUB_ENV"
+          echo "Submitting refs/heads/main at \`$snapshot_sha\`." >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@b6effb05e454b25005698d916606bdc6ffcbf961 # v5.7.0
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Generate and submit main dependency graph baseline
+        uses: gradle/actions/dependency-submission@9c971963bec38e04b3d30dcc455b5382be2fdbfb # v6.3.0
+        with:
+          additional-arguments: --no-configuration-cache --stacktrace
+          cache-provider: basic
+          dependency-graph: generate-and-submit
+          dependency-graph-continue-on-failure: false
+          validate-wrappers: true