diff --git a/server/src/__tests__/change-consent-gate.test.ts b/server/src/__tests__/change-consent-gate.test.ts
index 17b54031e54..65a173f0dd1 100644
--- a/server/src/__tests__/change-consent-gate.test.ts
+++ b/server/src/__tests__/change-consent-gate.test.ts
@@ -1,5 +1,6 @@
 import { randomUUID } from "node:crypto";
 import { afterAll, afterEach, beforeAll, describe, expect, it } from "vitest";
+import { eq } from "drizzle-orm";
 import {
   agents,
   companies,
@@ -133,6 +134,50 @@ describeEmbeddedPostgres("changeConsentGateService", () => {
   });
 
   it("allows a previous-run accepted interaction with a displayed diff for the bound target", async () => {
+    const { companyId, coachId, sourceRunId, proposalIssueId, targetKey } = await seedGateFixture();
+    const interactionId = randomUUID();
+    await db.insert(issueThreadInteractions).values({
+      id: interactionId,
+      companyId,
+      issueId: proposalIssueId,
+      kind: "request_confirmation",
+      status: "accepted",
+      continuationPolicy: "wake_assignee_on_accept",
+      sourceRunId,
+      createdByAgentId: coachId,
+      payload: {
+        version: 1,
+        prompt: "Apply this Reflection Coach skill diff?",
+        detailsMarkdown: "```diff\n+Tighten the workflow.\n```",
+        target: { type: "custom", key: targetKey, revisionId: "proposal-v1" },
+      },
+      result: { version: 1, outcome: "accepted" },
+      resolvedByUserId: "board-user",
+      resolvedAt: new Date(),
+    });
+    const actorRunId = randomUUID();
+
+    await expect(changeConsentGateService(db).assertConsented({
+      companyId,
+      actorAgentId: coachId,
+      actorRunId,
+      targetKeys: [targetKey],
+    })).resolves.toBe(true);
+
+    const [stored] = await db
+      .select({ result: issueThreadInteractions.result })
+      .from(issueThreadInteractions)
+      .where(eq(issueThreadInteractions.id, interactionId));
+
+    expect(stored?.result).toMatchObject({
+      consumedByRunId: actorRunId,
+      outcome: "accepted",
+      version: 1,
+    });
+    expect((stored?.result as { consumedAt?: unknown } | undefined)?.consumedAt).toEqual(expect.any(String));
+  });
+
+  it("rejects reusing an accepted interaction after it is consumed by a mutation", async () => {
     const { companyId, coachId, sourceRunId, proposalIssueId, targetKey } = await seedGateFixture();
     await db.insert(issueThreadInteractions).values({
       id: randomUUID(),
@@ -160,6 +205,16 @@ describeEmbeddedPostgres("changeConsentGateService", () => {
       actorRunId: randomUUID(),
       targetKeys: [targetKey],
     })).resolves.toBe(true);
+
+    await expect(changeConsentGateService(db).assertConsented({
+      companyId,
+      actorAgentId: coachId,
+      actorRunId: randomUUID(),
+      targetKeys: [targetKey],
+    })).rejects.toMatchObject({
+      status: 403,
+      details: { code: "reflection_coach_mutation_gate_required" },
+    });
   });
 
   it("allows legacy Reflection Coach target keys for durable accepted interactions", async () => {
diff --git a/server/src/services/change-consent-gate.ts b/server/src/services/change-consent-gate.ts
index dc5eab1217d..8523f04bcad 100644
--- a/server/src/services/change-consent-gate.ts
+++ b/server/src/services/change-consent-gate.ts
@@ -6,6 +6,11 @@ import { forbidden } from "../errors.js";
 
 export const AGENT_PROFILE_CHANGE_CONSENT_FIELDS = ["name", "role", "title", "capabilities"] as const;
 
+type ConsumedRequestConfirmationResult = RequestConfirmationResult & {
+  consumedAt?: string | null;
+  consumedByRunId?: string | null;
+};
+
 export function agentInstructionsChangeTargetKey(agentId: string) {
   return `agent:${agentId}:instructions`;
 }
@@ -47,6 +52,23 @@ function payloadHasDisplayedDiff(payload: RequestConfirmationPayload) {
   return /(^|\n)[+-][^\n]+/.test(details);
 }
 
+function requestConfirmationResultConsumed(result: RequestConfirmationResult | null) {
+  const consumed = result as ConsumedRequestConfirmationResult | null;
+  return Boolean(readNonEmptyString(consumed?.consumedByRunId) || readNonEmptyString(consumed?.consumedAt));
+}
+
+function markRequestConfirmationResultConsumed(
+  result: RequestConfirmationResult,
+  actorRunId: string,
+  consumedAt: Date,
+): ConsumedRequestConfirmationResult {
+  return {
+    ...result,
+    consumedAt: consumedAt.toISOString(),
+    consumedByRunId: actorRunId,
+  };
+}
+
 function legacyTargetKeysFor(targetKey: string) {
   if (targetKey.startsWith("agent:") && targetKey.endsWith(":instructions")) {
     const agentId = targetKey.slice("agent:".length, -":instructions".length);
@@ -146,6 +168,7 @@ export function changeConsentGateService(db: Db) {
         return payload.target?.type === "custom"
           && queryTargetKeys.includes(payload.target.key)
           && result?.outcome === "accepted"
+          && !requestConfirmationResultConsumed(result)
           && payloadHasDisplayedDiff(payload)
           && Boolean(row.sourceRunId)
           && row.sourceRunId !== actorRunId;
@@ -154,7 +177,48 @@ export function changeConsentGateService(db: Db) {
       if (!accepted) {
         throw forbidden(
           "Reflection Coach mutations require an accepted request_confirmation with a displayed diff for this target, "
-            + "created in a previous run.",
+            + "created in a previous run and not already consumed.",
+          {
+            code: "reflection_coach_mutation_gate_required",
+            targetKeys,
+          },
+        );
+      }
+
+      const acceptedResult = accepted.result as RequestConfirmationResult | null;
+      if (!acceptedResult) {
+        throw forbidden(
+          "Reflection Coach mutations require an accepted request_confirmation with a displayed diff for this target, "
+            + "created in a previous run and not already consumed.",
+          {
+            code: "reflection_coach_mutation_gate_required",
+            targetKeys,
+          },
+        );
+      }
+
+      const now = new Date();
+      const [consumed] = await db
+        .update(issueThreadInteractions)
+        .set({
+          result: markRequestConfirmationResultConsumed(acceptedResult, actorRunId, now),
+          updatedAt: now,
+        })
+        .where(and(
+          eq(issueThreadInteractions.id, accepted.id),
+          eq(issueThreadInteractions.companyId, input.companyId),
+          eq(issueThreadInteractions.createdByAgentId, actorAgentId),
+          eq(issueThreadInteractions.kind, "request_confirmation"),
+          eq(issueThreadInteractions.status, "accepted"),
+          sql`${issueThreadInteractions.result}->>'outcome' = 'accepted'`,
+          sql`coalesce(${issueThreadInteractions.result}->>'consumedByRunId', ${issueThreadInteractions.result}->>'consumedAt') is null`,
+        ))
+        .returning({ id: issueThreadInteractions.id });
+
+      if (!consumed) {
+        throw forbidden(
+          "Reflection Coach mutations require an accepted request_confirmation with a displayed diff for this target, "
+            + "created in a previous run and not already consumed.",
           {
             code: "reflection_coach_mutation_gate_required",
             targetKeys,