diff --git a/features/project_cli_commands.feature b/features/project_cli_commands.feature
index b6b48be2f..14f12022b 100644
--- a/features/project_cli_commands.feature
+++ b/features/project_cli_commands.feature
@@ -196,6 +196,11 @@ Feature: Project CLI command functions coverage
     When I invoke project-delete for "local/del-json" with yes format "json"
     Then the project cmd output should contain "deleted"
 
+  Scenario: delete command JSON includes deletion timestamp
+    Given a project "local/del-json-ts" is created in the commands DB
+    When I invoke project-delete for "local/del-json-ts" with yes format "json"
+    Then the project cmd JSON data should include deleted_at
+
   Scenario: delete nonexistent project fails
     When I invoke project-delete for "local/nope" with yes
     Then the project cmd should fail
diff --git a/features/steps/project_cli_commands_steps.py b/features/steps/project_cli_commands_steps.py
index 2a4e4e44e..180f23ee2 100644
--- a/features/steps/project_cli_commands_steps.py
+++ b/features/steps/project_cli_commands_steps.py
@@ -12,6 +12,7 @@ database, then restored after every step that needs them.
 
 from __future__ import annotations
 
+import json
 from io import StringIO
 from typing import Any
 
@@ -675,3 +676,22 @@ def step_cmd_fail(context: Any) -> None:
     assert context._cmd_failed, (
         f"Expected command to fail but it succeeded. Output:\n{context._cmd_output}"
     )
+
+
+@then("the project cmd JSON data should include deleted_at")
+def step_cmd_json_has_deleted_at(context: Any) -> None:
+    output = context._cmd_output.strip()
+    try:
+        envelope = json.loads(output)
+    except json.JSONDecodeError as exc:
+        raise AssertionError(
+            f"Command output is not valid JSON:\n{context._cmd_output}"
+        ) from exc
+
+    data = envelope.get("data")
+    assert isinstance(data, dict), (
+        f"Expected envelope data to be a dict, got {type(data).__name__}: {data}"
+    )
+    assert "deleted_at" in data, (
+        f"Expected 'deleted_at' in command JSON data, got keys {list(data.keys())}"
+    )
diff --git a/src/cleveragents/cli/commands/project.py b/src/cleveragents/cli/commands/project.py
index fd06e4924..d03ac5ef6 100644
--- a/src/cleveragents/cli/commands/project.py
+++ b/src/cleveragents/cli/commands/project.py
@@ -19,6 +19,7 @@ Based on ADR-009 (CLI Framework) and implementation_plan.md task B0.cli.projects
 from __future__ import annotations
 
 import re
+from datetime import UTC, datetime
 from pathlib import Path
 from typing import Annotated, Any
 
@@ -977,4 +978,13 @@ def delete(
     if output_format.lower() == OutputFormat.RICH:
         console.print(f"[green]✓[/green] Project '{name}' deleted.")
     else:
-        console.print(format_output({"deleted": name, "success": True}, output_format))
+        console.print(
+            format_output(
+                {
+                    "deleted": name,
+                    "success": True,
+                    "deleted_at": datetime.now(tz=UTC),
+                },
+                output_format,
+            )
+        )