diff --git a/CHANGELOG.md b/CHANGELOG.md
index 905c8b89c..062d90df0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,16 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
   from the TDD test so both scenarios run as normal regression guards. (#988)
 
 ### Fixed
+- **Wrapped plan tree JSON/YAML output in spec-required command envelope (#9313)**: The
+  ``agents plan tree`` CLI command's JSON and YAML output paths now include the
+  standardised envelope fields (``command``, ``status``, ``exit_code``, ``data``,
+  ``timing``, ``messages``) as required by the specification §Output Rendering
+  Framework. Previously the envelope was created with an empty ``command`` field,
+  which broke programmatic consumers that parse the ``command`` key to identify
+  the source command. Updated step definitions to validate against the envelope
+  structure (checking ``data`` for the tree array). Removed ``@tdd_expected_fail``
+  tag from the JSON format BDD scenario so it runs as a normal regression guard.
+
 - **Actor CLI NAME argument made optional, derived from YAML config** (#4186): The
   `agents actor add` positional ``NAME`` argument is now optional (defaults to
   ``None``). When omitted, the actor name is derived from the ``name`` field in
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index b7d1bc7a0..cf80688e3 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -35,3 +35,6 @@ Below are some of the specific details of various contributions.
 * HAL 9000 has contributed the ACMS Index Data Model and File Traversal Engine (PR #9664 / issue #9579): foundational data structures for indexed context entries with hot/warm/cold/archive storage tier classification, tag system, and a timeout-safe chunked file traversal engine for large projects with 10,000+ files.
 * HAL 9000 has contributed the error-suppression removal fix (PR #9247 / issue #9060): removed both `try...except Exception:` blocks in `register_registry_agents()` that silently suppressed errors from `actor_registry.list_actors()` and the route bridge refresh, enabling exceptions to propagate per CONTRIBUTING.md fail-fast policy. Added three Behave scenarios verifying RuntimeError, AttributeError, and TypeError propagation.
 * HAL 9000 has contributed the Strategize phase full context snapshot fix (issue #9056): added `_build_strategize_context_snapshot()` helper to `PlanLifecycleService`, updated `_try_record_decision()` to accept and forward a `ContextSnapshot` parameter, and added BDD test coverage verifying all four `ContextSnapshot` fields (`hot_context_hash`, `hot_context_ref`, `actor_state_ref`, `relevant_resources`) are populated during the Strategize phase.
+
+
+* HAL 9000 has contributed the plan tree JSON/YAML command envelope fix (PR #9313): updated ``tree_decisions_cmd`` to pass ``command="plan tree"`` to ``format_output()`` so that machine-readable output conforms to the spec-required command envelope structure.
diff --git a/features/plan_explain.feature b/features/plan_explain.feature
index 7051cfc33..63dd8ba9f 100644
--- a/features/plan_explain.feature
+++ b/features/plan_explain.feature
@@ -107,12 +107,12 @@ Feature: Plan explain and decision tree CLI commands
   # plan tree - json format
   # ------------------------------------------------------------------
 
-  @tdd_issue @tdd_issue_4254 @tdd_expected_fail
   Scenario: Tree with json format
     Given a set of test decisions forming a tree
     When I format the tree as json
     Then the json tree output should be valid json
     And the json tree output should contain "decision_id"
+    And the json tree envelope should contain "command" field equal to "plan tree"
 
   # ------------------------------------------------------------------
   # plan tree - yaml format
diff --git a/features/steps/plan_explain_steps.py b/features/steps/plan_explain_steps.py
index 52f66681a..7ea686fd1 100644
--- a/features/steps/plan_explain_steps.py
+++ b/features/steps/plan_explain_steps.py
@@ -402,14 +402,31 @@ def step_roots_no_children(context: Context) -> None:
 @then("the json tree output should be valid json")
 def step_tree_json_valid(context: Context) -> None:
     parsed = json.loads(context.pe_tree_json)
-    assert isinstance(parsed, list), "Expected a JSON array"
+    assert isinstance(parsed, dict), f"Expected a JSON envelope object, got {type(parsed).__name__}"
+    assert "data" in parsed, f"Expected 'data' in envelope, keys: {list(parsed.keys())}"
+    assert isinstance(parsed["data"], list), "Expected 'data' field to be a JSON array (tree)"
 
 
 @then('the json tree output should contain "{text}"')
 def step_tree_json_contains(context: Context, text: str) -> None:
+    parsed = json.loads(context.pe_tree_json)
     assert text in context.pe_tree_json, f"Expected '{text}' in tree JSON"
+    # Verify the text is within the data (envelope payload).
+    if isinstance(parsed.get("data"), list):
+        data_str = json.dumps(parsed["data"])
+        assert text in data_str, f"Expected '{text}' in parsed 'data' field"
 
 
+
+@then('the json tree envelope should contain "{field}" field equal to "{value}"')
+def step_tree_envelope_has_field(context: Context, field: str, value: str) -> None:
+    """Validate that the JSON command envelope has a specific top-level field with a given value."""
+    parsed = json.loads(context.pe_tree_json)
+    assert field in parsed, f"Expected '{field}' in envelope at top level. Keys: {list(parsed.keys())}"
+    assert parsed[field] == value, (
+        f"Envelope field '{field}' expected '{value}', got '{parsed[field]}'"
+    )
+
 @then('the yaml tree output should contain "{text}"')
 def step_tree_yaml_contains(context: Context, text: str) -> None:
     assert text in context.pe_tree_yaml, f"Expected '{text}' in tree YAML"
diff --git a/src/cleveragents/cli/commands/plan.py b/src/cleveragents/cli/commands/plan.py
index b2a7f64d0..3b6e4478b 100644
--- a/src/cleveragents/cli/commands/plan.py
+++ b/src/cleveragents/cli/commands/plan.py
@@ -4153,7 +4153,15 @@ def tree_decisions_cmd(
     )
 
     if fmt in (OutputFormat.JSON, OutputFormat.YAML):
-        console.print(format_output(tree_data, fmt))
+        console.print(
+            format_output(
+                tree_data,
+                fmt,
+                command="plan tree",
+                status="ok",
+                exit_code=0,
+            )
+        )
     elif fmt == OutputFormat.TABLE:
         # Flatten for table view
         filtered = (