diff --git a/contracts/OMN-11913.yaml b/contracts/OMN-11913.yaml
new file mode 100644
index 00000000000..4c949e46cdf
--- /dev/null
+++ b/contracts/OMN-11913.yaml
@@ -0,0 +1,43 @@
+---
+schema_version: "1.0.0"
+ticket_id: "OMN-11913"
+title: "Antipattern vector index effect node"
+summary: >
+  Bind central evidence for omnimarket PR #824, which adds node_antipattern_index_effect: an effect node
+  that loads the antipattern registry, embeds vector-enabled entries through the configured embedding
+  endpoint, and upserts them into the Qdrant-backed antipattern index.
+is_seam_ticket: true
+interface_change: true
+interfaces_touched:
+  - events
+  - topics
+  - public_api
+emergency_bypass:
+  enabled: false
+  justification: ""
+  follow_up_ticket_id: ""
+dod_evidence:
+  - id: "dod-omnimarket-pr-824"
+    description: "Bind OMN-11913 evidence to omnimarket PR #824."
+    source: "manual"
+    status: "verified"
+    checks:
+      - check_type: "command"
+        check_value: "grep -q '^status: PASS$' drift/dod_receipts/OMN-11913/dod-omnimarket-pr-824/command.yaml
+          && grep -q '^pr_number: 824$' drift/dod_receipts/OMN-11913/dod-omnimarket-pr-824/command.yaml"
+  - id: "dod-antipattern-index-local-validation"
+    description: "Focused antipattern index tests, strict mypy, and local pre-commit checks pass for the
+      current omnimarket PR head."
+    source: "manual"
+    status: "verified"
+    checks:
+      - check_type: "command"
+        check_value: "grep -q '^status: PASS$' drift/dod_receipts/OMN-11913/dod-antipattern-index-local-validation/command.yaml
+          && grep -q '17 passed, 1 skipped' drift/dod_receipts/OMN-11913/dod-antipattern-index-local-validation/command.yaml"
+  - id: "dod-occ-pr"
+    description: "OCC PR carries the central OMN-11913 contract and receipts."
+    source: "manual"
+    status: "verified"
+    checks:
+      - check_type: "command"
+        check_value: "grep -q '^status: PASS$' drift/dod_receipts/OMN-11913/dod-occ-pr/command.yaml"
diff --git a/drift/dod_receipts/OMN-11913/dod-antipattern-index-local-validation/command.yaml b/drift/dod_receipts/OMN-11913/dod-antipattern-index-local-validation/command.yaml
new file mode 100644
index 00000000000..f2fde28be16
--- /dev/null
+++ b/drift/dod_receipts/OMN-11913/dod-antipattern-index-local-validation/command.yaml
@@ -0,0 +1,27 @@
+---
+schema_version: "1.0.0"
+ticket_id: "OMN-11913"
+evidence_item_id: "dod-antipattern-index-local-validation"
+check_type: "command"
+check_value: "uv run python -m pytest tests/validation/test_runtime_profile_contracts.py::test_effectful_command_consumers_declare_effects_runtime_profile
+  -q && uv run python -m pytest src/omnimarket/nodes/node_antipattern_index_effect/tests/ -q && uv run
+  mypy src/omnimarket/nodes/node_antipattern_index_effect --strict && OMNIBASE_INFRA_PATH=/Users/jonah/Code/omni_home/omnibase_infra
+  uv run pre-commit run --files pyproject.toml src/omnimarket/nodes/node_antipattern_index_effect/"
+contract_sha256: "sha256:82be5012e2f3c774c2dcf3a7aa51575acecc3bbde7c557ba71814eb63a63970b"
+status: PASS
+run_timestamp: "2026-05-24T19:16:59Z"
+commit_sha: "20472ddb5fc455e7be820a08fd016b01e4e7eb4f"
+runner: "codex-local"
+verifier: "codex"
+probe_command: "focused local validation in /Users/jonah/Code/omni_home/omni_worktrees/OMN-11913/omnimarket"
+probe_stdout: |
+  runtime profile validation: 1 passed in 0.63s
+  pytest: 17 passed, 1 skipped in 0.66s
+  mypy: Success: no issues found in 8 source files
+  pre-commit --files: PASS
+actual_output: "PASS: antipattern index node focused tests, strict mypy, and targeted pre-commit checks
+  pass locally."
+exit_code: 0
+pr_number: 824
+branch: "jonah/omn-11913-antipattern-indexer"
+working_dir: "/Users/jonah/Code/omni_home/omni_worktrees/OMN-11913/omnimarket"
diff --git a/drift/dod_receipts/OMN-11913/dod-occ-pr/command.yaml b/drift/dod_receipts/OMN-11913/dod-occ-pr/command.yaml
new file mode 100644
index 00000000000..34d08fd839a
--- /dev/null
+++ b/drift/dod_receipts/OMN-11913/dod-occ-pr/command.yaml
@@ -0,0 +1,20 @@
+---
+schema_version: "1.0.0"
+ticket_id: "OMN-11913"
+evidence_item_id: "dod-occ-pr"
+check_type: "command"
+check_value: "gh pr view 1541 --repo OmniNode-ai/onex_change_control --json number,headRefName,title,state"
+contract_sha256: "sha256:82be5012e2f3c774c2dcf3a7aa51575acecc3bbde7c557ba71814eb63a63970b"
+status: PASS
+run_timestamp: "2026-05-24T19:02:00Z"
+commit_sha: "3c56d4ab384750dcb626c984a46a14b95e75f6a3"
+runner: "codex-local"
+verifier: "codex"
+probe_command: "gh pr view 1541 --repo OmniNode-ai/onex_change_control --json number,headRefName,title,state"
+probe_stdout: |
+  {"headRefName":"jonah/omn-11913-occ-evidence","number":1541,"state":"OPEN","title":"contracts(OMN-11913): add omnimarket 824 evidence"}
+actual_output: "PASS: onex_change_control PR carries the central OMN-11913 contract and receipts."
+exit_code: 0
+pr_number: 1541
+branch: "jonah/omn-11913-occ-evidence"
+working_dir: "/Users/jonah/Code/omni_home/omni_worktrees/OMN-11913/onex_change_control"
diff --git a/drift/dod_receipts/OMN-11913/dod-omnimarket-pr-824/command.yaml b/drift/dod_receipts/OMN-11913/dod-omnimarket-pr-824/command.yaml
new file mode 100644
index 00000000000..32670834644
--- /dev/null
+++ b/drift/dod_receipts/OMN-11913/dod-omnimarket-pr-824/command.yaml
@@ -0,0 +1,20 @@
+---
+schema_version: "1.0.0"
+ticket_id: "OMN-11913"
+evidence_item_id: "dod-omnimarket-pr-824"
+check_type: "command"
+check_value: "gh pr view 824 --repo OmniNode-ai/omnimarket --json number,headRefOid,headRefName,title,state"
+contract_sha256: "sha256:82be5012e2f3c774c2dcf3a7aa51575acecc3bbde7c557ba71814eb63a63970b"
+status: PASS
+run_timestamp: "2026-05-24T19:16:59Z"
+commit_sha: "20472ddb5fc455e7be820a08fd016b01e4e7eb4f"
+runner: "codex-local"
+verifier: "codex"
+probe_command: "gh pr view 824 --repo OmniNode-ai/omnimarket --json number,headRefOid,headRefName,title,state"
+probe_stdout: |
+  {"headRefName":"jonah/omn-11913-antipattern-indexer","headRefOid":"20472ddb5fc455e7be820a08fd016b01e4e7eb4f","number":824,"state":"OPEN","title":"feat(OMN-11913): add node_antipattern_index_effect — antipattern vector store indexer"}
+actual_output: "PASS: omnimarket PR #824 is open at the OMN-11913 antipattern index head commit."
+exit_code: 0
+pr_number: 824
+branch: "jonah/omn-11913-antipattern-indexer"
+working_dir: "/Users/jonah/Code/omni_home/omni_worktrees/OMN-11913/omnimarket"