diff --git a/.sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-EXECUTION-ATTEMPT.md b/.sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-EXECUTION-ATTEMPT.md
new file mode 100644
index 0000000..721f426
--- /dev/null
+++ b/.sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-EXECUTION-ATTEMPT.md
@@ -0,0 +1,89 @@
+---
+name: cto-first-real-governed-workflow-execution-attempt
+tier: local
+status: blocked
+owner: jp
+source: .sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-ISSUES.md
+created: 2026-06-01
+last_reviewed: 2026-06-01
+lifecycle_classification: planning
+core_promotion_status: not-promoted
+description: Child-local evidence record for the first approved CTO-WORK-049 execution attempt.
+---
+
+# CTO First Real Governed Workflow Execution Attempt
+
+Local planning SOT only. Not a Core Protocol. Not active Core authority.
+
+## Scope
+
+Work item: `CTO-WORK-049`
+
+Approved target:
+
+```text
+/home/svrnty/workspaces/cortex-os/cto-stage5-target-sandbox
+```
+
+Approved task:
+
+```text
+src/strings.py slugify alignment task
+```
+
+Approval text supplied by JP on 2026-06-01:
+
+```text
+I approve CTO-WORK-049 against /home/svrnty/workspaces/cortex-os/cto-stage5-target-sandbox for the src/strings.py slugify alignment task.
+```
+
+## Attempt
+
+Command class: CTO Harness Case Stage 5 seam.
+
+Runtime default activation: false.
+
+Target mutation: none.
+
+Harness run:
+
+```text
+/home/svrnty/.hermes/profiles/cto-planb/harness-runs/20260601T103932Z-r1-string-slugify-137131/report.json
+```
+
+Backend evidence:
+
+```text
+/home/svrnty/.hermes/profiles/cto-planb/harness-runs/20260601T103932Z-r1-string-slugify-137131/backend/provider-unavailable.txt
+```
+
+## Result
+
+Status: blocked.
+
+Reason: the shell resolved `case` as a shell keyword, not an executable Case CLI. The Harness therefore failed closed before Case process start and before target mutation.
+
+Observed Harness facts:
+
+- target repository admission status: `admitted`
+- target repository start clean: true
+- target repository ending clean: true
+- changed files: none
+- tests command recorded: `python3 -m pytest -q`
+- tests passed: true
+- Case process started: false
+- backend exit code class: provider unavailable
+
+## Decision
+
+Do not mark `CTO-WORK-049` validated.
+
+Do not patch the target by hand.
+
+Do not use fake or shell-keyword resolution as Case proof.
+
+Next useful step is to provide or build an executable Case CLI path and rerun the same approved Harness seam.
+
+## Non-Authority Notice
+
+This record is child-local planning evidence. It does not promote CTO artifacts into Core, does not activate Case as default backend, and does not authorize any broader target mutation.
diff --git a/WORKBOARD.yaml b/WORKBOARD.yaml
index 4f281fa..0f64095 100644
--- a/WORKBOARD.yaml
+++ b/WORKBOARD.yaml
@@ -250,3 +250,8 @@ items:
     status: validated
     source: .sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-APPROVAL-PACKET.md
     owner: jp
+  - id: CTO-WORK-051
+    title: First Real Governed Workflow Execution Attempt
+    status: blocked
+    source: .sot/03-PROTOCOLS/CTO-FIRST-REAL-GOVERNED-WORKFLOW-EXECUTION-ATTEMPT.md
+    owner: jp