diff --git a/docs/VISUAL_MODEL.md b/docs/VISUAL_MODEL.md
index 76db566..5965cd6 100644
--- a/docs/VISUAL_MODEL.md
+++ b/docs/VISUAL_MODEL.md
@@ -5,6 +5,9 @@ The Campaign review flow is the reference for runtime workflow progress:
 - a compact stage rail communicates order, current state, completion, warning,
   failure, partial progress, and locks;
 - the active handoff owns the detailed controls;
+- unknown module-action outcomes expose evidence fields plus **Effect
+  confirmed** and **Effect absent** actions; Retry stays hidden until absence is
+  verified;
 - evidence remains visible without turning every stage into a permanent card;
 - unavailable stages stay visibly unavailable while non-blocking optional
   stages do not interrupt the connector state.
diff --git a/webui/src/api/workflow.ts b/webui/src/api/workflow.ts
index 81aae9e..75d510c 100644
--- a/webui/src/api/workflow.ts
+++ b/webui/src/api/workflow.ts
@@ -640,7 +640,7 @@ export function resolveWorkflowStep(
   instanceId: string,
   stepId: string,
   payload: {
-    action: "complete" | "approve" | "changes" | "reject" | "resume" | "retry" | "cancel";
+    action: "complete" | "approve" | "changes" | "reject" | "resume" | "retry" | "confirm_effect" | "confirm_absent" | "cancel";
     output?: Record<string, unknown>;
     evidence?: string[];
     comment?: string | null;
diff --git a/webui/src/features/workflow/WorkflowRunsDialog.tsx b/webui/src/features/workflow/WorkflowRunsDialog.tsx
index 9bc4ae7..79ffb69 100644
--- a/webui/src/features/workflow/WorkflowRunsDialog.tsx
+++ b/webui/src/features/workflow/WorkflowRunsDialog.tsx
@@ -49,6 +49,8 @@ type WorkflowAction =
   | "reject"
   | "resume"
   | "retry"
+  | "confirm_effect"
+  | "confirm_absent"
   | "cancel";
 
 export default function WorkflowRunsDialog({
@@ -452,6 +454,7 @@ export default function WorkflowRunsDialog({
                                       : action === "approve"
                                         || action === "complete"
                                         || action === "resume"
+                                        || action === "confirm_effect"
                                         ? "primary"
                                         : undefined
                                   }
@@ -549,6 +552,8 @@ function handoffActions(step: WorkflowInstanceStep | null): WorkflowAction[] {
       "reject",
       "resume",
       "retry",
+      "confirm_effect",
+      "confirm_absent",
       "cancel"
     ].includes(action)
   ));
@@ -562,6 +567,8 @@ function actionLabel(action: WorkflowAction): string {
     reject: "Reject",
     resume: "Resume",
     retry: "Retry",
+    confirm_effect: "Effect confirmed",
+    confirm_absent: "Effect absent",
     cancel: "Cancel"
   }[action];
 }