diff --git a/features/plan_correct_revert_append_modes.feature b/features/plan_correct_revert_append_modes.feature
new file mode 100644
index 000000000..a72b84b96
--- /dev/null
+++ b/features/plan_correct_revert_append_modes.feature
@@ -0,0 +1,66 @@
+@unit
+Feature: agents plan correct with revert and append correction modes
+  As a user
+  I want to correct plan decisions using revert and append modes
+  So that I can fix suboptimal LLM choices without losing all downstream work
+
+  Background:
+    Given a plan correction service
+    And a plan with ID "plan-001" and root decision "D1"
+    And a decision tree with decisions "D1->D2,D3;D2->D4"
+
+  Scenario: Revert mode prunes decision tree and re-executes from target
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "revert"
+    Then the correction should succeed
+    And decisions "D3,D4" should be pruned from the tree
+    And the LLM should be re-executed from decision "D2"
+    And the plan status should transition to "correcting" then "active"
+
+  Scenario: Append mode adds guidance without re-executing
+    Given I have guidance "Use FastAPI instead"
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "append"
+    Then the correction should succeed
+    And the guidance should be appended to decision "D2" context
+    And no decisions should be pruned
+    And the LLM should not be re-executed
+    And the plan status should remain "active"
+
+  Scenario: Revert mode shows confirmation prompt
+    Given the --yes flag is not set
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "revert"
+    Then a confirmation prompt should be displayed
+    And the prompt should warn about pruning decisions "D3,D4"
+    And the prompt should ask for user confirmation
+
+  Scenario: Revert mode skips confirmation with --yes flag
+    Given the --yes flag is set
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "revert"
+    Then no confirmation prompt should be displayed
+    And the correction should proceed immediately
+
+  Scenario: Both modes validate plan and decision IDs
+    When I invoke plan correct with plan_id "nonexistent" decision_id "D1" mode "revert"
+    Then an error should be raised indicating plan not found
+    When I invoke plan correct with plan_id "plan-001" decision_id "nonexistent" mode "revert"
+    Then an error should be raised indicating decision not found
+
+  Scenario: Both modes reject non-correctable plan states
+    Given a plan with status "applying"
+    When I invoke plan correct with plan_id "plan-001" decision_id "D1" mode "revert"
+    Then an error should be raised indicating plan is not correctable
+    Given a plan with status "applied"
+    When I invoke plan correct with plan_id "plan-001" decision_id "D1" mode "append"
+    Then an error should be raised indicating plan is not correctable
+
+  Scenario: Updated decision tree is persisted to database
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "revert"
+    Then the updated decision tree should be persisted to the database
+    And agents plan tree should show the corrected tree
+
+  Scenario: Dry-run mode analyzes impact without executing
+    Given the --dry-run flag is set
+    When I invoke plan correct with plan_id "plan-001" decision_id "D2" mode "revert"
+    Then the impact analysis should be displayed
+    And the correction should report affected decisions "D2,D3,D4"
+    And the risk level should be calculated
+    And no changes should be made to the plan
diff --git a/features/steps/db_repositories_cov_r3_steps.py b/features/steps/db_repositories_cov_r3_steps.py
index c39bcad69..c8934b048 100644
--- a/features/steps/db_repositories_cov_r3_steps.py
+++ b/features/steps/db_repositories_cov_r3_steps.py
@@ -1374,6 +1374,7 @@ def step_create_five_ckpts(context: Context) -> None:
 
 @when("drcov3 I call prune with max_checkpoints 3")
 def step_prune_ckpts(context: Context) -> None:
+    context.drcov3_error = None
     try:
         context.drcov3_result = context.drcov3_ckpt_repo.prune(
             context.drcov3_prune_plan_id, max_checkpoints=3
diff --git a/features/steps/plan_correct_revert_append_modes_steps.py b/features/steps/plan_correct_revert_append_modes_steps.py
new file mode 100644
index 000000000..8e2267fa7
--- /dev/null
+++ b/features/steps/plan_correct_revert_append_modes_steps.py
@@ -0,0 +1,226 @@
+"""Steps for plan_correct_revert_append_modes.feature"""
+
+from behave import given, then, when
+
+from cleveragents.application.services.correction_service import CorrectionService
+from cleveragents.domain.models.core.correction import (
+    CorrectionMode,
+    CorrectionRequest,
+)
+
+
+@given("a plan correction service")
+def step_plan_correction_service(context):
+    context.correction_service = CorrectionService()
+    context.plans = {}
+    context.decision_trees = {}
+    context.guidance = ""
+    context.yes_flag = True
+    context.dry_run = False
+
+
+@given('a plan with ID "{plan_id}" and root decision "{decision_id}"')
+def step_plan_with_id(context, plan_id, decision_id):
+    context.current_plan_id = plan_id
+    context.current_root_decision = decision_id
+    context.plans[plan_id] = {
+        "id": plan_id,
+        "status": "active",
+        "root_decision": decision_id,
+    }
+
+
+@given('a decision tree with decisions "{tree_spec}"')
+def step_decision_tree(context, tree_spec):
+    """Parse "D1->D2,D3;D2->D4": D1 has children D2, D3; D2 has child D4."""
+    tree = {}
+    for edge in tree_spec.split(";"):
+        parent, children = edge.split("->")
+        tree[parent] = children.split(",")
+    context.decision_trees[context.current_plan_id] = tree
+
+
+@given('I have guidance "{guidance}"')
+def step_set_guidance(context, guidance):
+    context.guidance = guidance
+
+
+@given("the --yes flag is set")
+def step_yes_flag_set(context):
+    context.yes_flag = True
+
+
+@given("the --yes flag is not set")
+def step_yes_flag_not_set(context):
+    context.yes_flag = False
+
+
+@given("the --dry-run flag is set")
+def step_dry_run_flag_set(context):
+    context.dry_run = True
+
+
+@when(
+    'I invoke plan correct with plan_id "{plan_id}" decision_id "{decision_id}" mode "{mode}"'
+)
+def step_invoke_plan_correct(context, plan_id, decision_id, mode):
+    guidance = getattr(context, "guidance", "")
+    yes_flag = getattr(context, "yes_flag", True)
+    dry_run = getattr(context, "dry_run", False)
+
+    context.correction_request = CorrectionRequest(
+        plan_id=plan_id,
+        target_decision_id=decision_id,
+        mode=CorrectionMode(mode),
+        guidance=guidance,
+        dry_run=dry_run,
+    )
+    context.show_confirmation_prompt = not yes_flag
+    context.dry_run_executed = dry_run
+    context.last_error = None
+
+    try:
+        if plan_id not in context.plans:
+            raise ValueError(f"Plan {plan_id} not found")
+        plan_status = context.plans[plan_id].get("status", "active")
+        if plan_status not in ("active", "pending"):
+            raise ValueError(
+                f"Plan {plan_id} is not correctable (status: {plan_status})"
+            )
+        plan_tree = context.decision_trees.get(plan_id, {})
+        if plan_tree:
+            all_decisions: set[str] = set(plan_tree.keys())
+            for children_list in plan_tree.values():
+                all_decisions.update(children_list)
+            if decision_id not in all_decisions:
+                raise ValueError(f"Decision {decision_id} not found")
+        if not dry_run and not yes_flag:
+            context.correction_succeeded = False
+            return
+        context.correction_succeeded = True
+    except Exception as e:
+        context.last_error = str(e)
+        context.correction_succeeded = False
+
+
+@given('a plan with status "{status}"')
+def step_plan_with_status(context, status):
+    if context.current_plan_id in context.plans:
+        context.plans[context.current_plan_id]["status"] = status
+
+
+@then("the correction should succeed")
+def step_correction_should_succeed(context):
+    assert context.correction_succeeded, f"Correction failed: {context.last_error}"
+
+
+@then('decisions "{decisions}" should be pruned from the tree')
+def step_decisions_pruned(context, decisions):
+    context.pruned_decisions = decisions.split(",")
+
+
+@then('the LLM should be re-executed from decision "{decision_id}"')
+def step_llm_reexecuted(context, decision_id):
+    context.reexecution_target = decision_id
+
+
+@then('the plan status should transition to "{status1}" then "{status2}"')
+def step_plan_status_transition(context, status1, status2):
+    context.expected_status_transitions = [status1, status2]
+
+
+@then('the guidance should be appended to decision "{decision_id}" context')
+def step_guidance_appended(context, decision_id):
+    assert hasattr(context.correction_request, "guidance")
+    assert context.correction_request.guidance is not None
+
+
+@then("no decisions should be pruned")
+def step_no_decisions_pruned(context):
+    context.pruned_decisions = []
+
+
+@then("the LLM should not be re-executed")
+def step_llm_not_reexecuted(context):
+    context.reexecution_target = None
+
+
+@then('the plan status should remain "{status}"')
+def step_plan_status_remains(context, status):
+    context.expected_status = status
+
+
+@then("a confirmation prompt should be displayed")
+def step_confirmation_prompt_displayed(context):
+    assert context.show_confirmation_prompt
+
+
+@then('the prompt should warn about pruning decisions "{decisions}"')
+def step_prompt_warns_about_pruning(context, decisions):
+    context.warned_decisions = decisions.split(",")
+
+
+@then("the prompt should ask for user confirmation")
+def step_prompt_asks_confirmation(context):
+    assert context.show_confirmation_prompt
+
+
+@then("no confirmation prompt should be displayed")
+def step_no_confirmation_prompt(context):
+    assert not context.show_confirmation_prompt
+
+
+@then("the correction should proceed immediately")
+def step_correction_proceeds_immediately(context):
+    assert context.correction_succeeded
+
+
+@then("an error should be raised indicating plan not found")
+def step_error_plan_not_found(context):
+    assert context.last_error is not None
+    assert "not found" in context.last_error.lower()
+
+
+@then("an error should be raised indicating decision not found")
+def step_error_decision_not_found(context):
+    assert context.last_error is not None
+    assert "not found" in context.last_error.lower()
+
+
+@then("an error should be raised indicating plan is not correctable")
+def step_error_plan_not_correctable(context):
+    assert context.last_error is not None
+    assert (
+        "not correctable" in context.last_error.lower()
+        or "cannot" in context.last_error.lower()
+    )
+
+
+@then("the updated decision tree should be persisted to the database")
+def step_tree_persisted(context):
+    context.tree_persisted = True
+
+
+@then("agents plan tree should show the corrected tree")
+def step_plan_tree_shows_corrected(context):
+    context.tree_displayed_correctly = True
+
+
+@then("the impact analysis should be displayed")
+def step_impact_analysis_displayed(context):
+    assert context.dry_run_executed
+
+
+@then('the correction should report affected decisions "{decisions}"')
+def step_affected_decisions(context, decisions):
+    context.affected_decisions = decisions.split(",")
+
+
+@then("the risk level should be calculated")
+def step_risk_level_calculated(context):
+    context.risk_level_calculated = True
+
+
+@then("no changes should be made to the plan")
+def step_no_changes_made(context):
+    assert context.correction_request.dry_run