diff --git a/apps/opencode-plugin/index.ts b/apps/opencode-plugin/index.ts
index 0bb75c8d..6868a076 100644
--- a/apps/opencode-plugin/index.ts
+++ b/apps/opencode-plugin/index.ts
@@ -40,7 +40,7 @@ import {
   handleArchiveCommand,
   type CommandDeps,
 } from "./commands";
-import { planDenyFeedback } from "@plannotator/shared/feedback-templates";
+import { planDenyFeedback, planApproveFeedback } from "@plannotator/shared/feedback-templates";
 import {
   normalizeEditPermission,
   stripConflictingPlanModeRules,
@@ -473,20 +473,7 @@ Do NOT proceed with implementation until your plan is approved.`);
               }
             }
 
-            if (result.feedback) {
-              return `Plan approved with notes!
-${result.savedPath ? `Saved to: ${result.savedPath}` : ""}
-
-## Implementation Notes
-
-The user approved your plan but added the following notes to consider during implementation:
-
-${result.feedback}
-
-Proceed with implementation, incorporating these notes where applicable.`;
-            }
-
-            return `Plan approved!${result.savedPath ? ` Saved to: ${result.savedPath}` : ""}`;
+            return planApproveFeedback(result.feedback, result.savedPath);
           } else {
             return planDenyFeedback(result.feedback || "", "submit_plan", {
               planFilePath: sourceFilePath,
diff --git a/apps/pi-extension/index.ts b/apps/pi-extension/index.ts
index db58ef9a..db029a33 100644
--- a/apps/pi-extension/index.ts
+++ b/apps/pi-extension/index.ts
@@ -34,7 +34,7 @@ import {
 	markCompletedSteps,
 	parseChecklist,
 } from "./generated/checklist.js";
-import { planDenyFeedback } from "./generated/feedback-templates.js";
+import { planDenyFeedback, DECISIONS_LOG_NOTE } from "./generated/feedback-templates.js";
 import { hasMarkdownFiles } from "./generated/resolve-file.js";
 import { FILE_BROWSER_EXCLUDED } from "./generated/reference-common.js";
 import { openBrowser } from "./server/network.js";
@@ -666,7 +666,7 @@ export default function plannotator(pi: ExtensionAPI): void {
 						content: [
 							{
 								type: "text",
-								text: `Plan approved with notes! You now have full tool access (read, bash, edit, write). Execute the plan in ${planFilePath}. ${doneMsg}\n\n## Implementation Notes\n\nThe user approved your plan but added the following notes to consider during implementation:\n\n${result.feedback}\n\nProceed with implementation, incorporating these notes where applicable.`,
+								text: `Plan approved with notes! You now have full tool access (read, bash, edit, write). Execute the plan in ${planFilePath}. ${doneMsg}\n\n## Implementation Notes\n\nThe user approved your plan but added the following notes to consider during implementation:\n\n${result.feedback}\n\nProceed with implementation, incorporating these notes where applicable.${DECISIONS_LOG_NOTE}`,
 							},
 						],
 						details: { approved: true, feedback: result.feedback },
@@ -677,7 +677,7 @@ export default function plannotator(pi: ExtensionAPI): void {
 					content: [
 						{
 							type: "text",
-							text: `Plan approved. You now have full tool access (read, bash, edit, write). Execute the plan in ${planFilePath}. ${doneMsg}`,
+							text: `Plan approved. You now have full tool access (read, bash, edit, write). Execute the plan in ${planFilePath}. ${doneMsg}${DECISIONS_LOG_NOTE}`,
 						},
 					],
 					details: { approved: true },
diff --git a/packages/shared/feedback-templates.test.ts b/packages/shared/feedback-templates.test.ts
index 47564a00..aa8ed64b 100644
--- a/packages/shared/feedback-templates.test.ts
+++ b/packages/shared/feedback-templates.test.ts
@@ -1,5 +1,5 @@
 import { describe, test, expect } from "bun:test";
-import { planDenyFeedback } from "./feedback-templates";
+import { planDenyFeedback, planApproveFeedback, DECISIONS_LOG_NOTE } from "./feedback-templates";
 
 describe("feedback-templates", () => {
   /**
@@ -63,3 +63,67 @@ describe("feedback-templates", () => {
   });
 
 });
+
+describe("context anchoring", () => {
+  /**
+   * On denial, the agent must be instructed to maintain a Decisions Log
+   * so that rejected approaches are documented and not re-proposed.
+   */
+  test("plan deny includes context anchoring instructions", () => {
+    const result = planDenyFeedback("some feedback");
+    expect(result).toContain("Decisions Log");
+    expect(result).toContain("Rejected:");
+    expect(result).toContain("cross-session memory");
+  });
+
+  /**
+   * On approval, the agent must be reminded to reference the Decisions Log
+   * during implementation — closing the context anchoring loop.
+   */
+  test("plan approve includes Decisions Log reminder", () => {
+    const result = planApproveFeedback();
+    expect(result).toContain("Plan approved");
+    expect(result).toContain("Decisions Log");
+  });
+
+  /**
+   * Approval with notes must signal "with notes" in the header so the
+   * agent knows content follows, and include both the notes and the
+   * Decisions Log reminder.
+   */
+  test("plan approve with notes includes both notes and Decisions Log reminder", () => {
+    const result = planApproveFeedback("Use the adapter pattern here.");
+    expect(result).toContain("Plan approved with notes!");
+    expect(result).toContain("Implementation Notes");
+    expect(result).toContain("Use the adapter pattern here.");
+    expect(result).toContain("Decisions Log");
+  });
+
+  /**
+   * Approval without notes should NOT say "with notes".
+   */
+  test("plan approve without notes does not include 'with notes' in header", () => {
+    const result = planApproveFeedback();
+    expect(result).toContain("Plan approved!");
+    expect(result).not.toContain("with notes");
+  });
+
+  /**
+   * DECISIONS_LOG_NOTE is exported as a named constant so Pi and other
+   * integrations that compose their own approval messages can include it
+   * without duplicating the text.
+   */
+  test("DECISIONS_LOG_NOTE is a non-empty string containing 'Decisions Log'", () => {
+    expect(typeof DECISIONS_LOG_NOTE).toBe("string");
+    expect(DECISIONS_LOG_NOTE.length).toBeGreaterThan(0);
+    expect(DECISIONS_LOG_NOTE).toContain("Decisions Log");
+  });
+
+  /**
+   * Approval with saved path must surface the file path.
+   */
+  test("plan approve with savedPath includes the path", () => {
+    const result = planApproveFeedback(undefined, "/tmp/plans/auth.md");
+    expect(result).toContain("/tmp/plans/auth.md");
+  });
+});
diff --git a/packages/shared/feedback-templates.ts b/packages/shared/feedback-templates.ts
index 8d6c3426..8beed2a3 100644
--- a/packages/shared/feedback-templates.ts
+++ b/packages/shared/feedback-templates.ts
@@ -9,6 +9,25 @@ export interface PlanDenyFeedbackOptions {
   planFilePath?: string;
 }
 
+/**
+ * Appended to all approval messages so the agent knows to carry the
+ * Decisions Log forward into implementation.
+ */
+export const DECISIONS_LOG_NOTE = `\n\nIf your plan contains a \`## Decisions Log\`, keep it as a reference during implementation — it documents the rejected alternatives that shaped this design.`;
+
+export const planApproveFeedback = (
+  notes?: string,
+  savedPath?: string,
+): string => {
+  const header = `Plan approved${notes ? " with notes" : ""}!`;
+  const savedNote = savedPath ? `\nSaved to: ${savedPath}` : "";
+  const notesSection = notes
+    ? `\n\n## Implementation Notes\n\nThe user approved your plan but added the following notes to consider during implementation:\n\n${notes}\n\nProceed with implementation, incorporating these notes where applicable.`
+    : "";
+
+  return `${header}${savedNote}${notesSection}${DECISIONS_LOG_NOTE}`;
+};
+
 export const planDenyFeedback = (
   feedback: string,
   toolName: string = "ExitPlanMode",
@@ -18,5 +37,7 @@ export const planDenyFeedback = (
     ? `- Your plan is saved at: ${options.planFilePath}\n  You can edit this file to make targeted changes, then pass its path to ${toolName}.\n`
     : "";
 
-  return `YOUR PLAN WAS NOT APPROVED.\n\nYou MUST revise the plan to address ALL of the feedback below before calling ${toolName} again.\n\nRules:\n${planFileRule}- Do not resubmit the same plan unchanged.\n- Do NOT change the plan title (first # heading) unless the user explicitly asks you to.\n\n${feedback || "Plan changes requested"}`;
+  const contextAnchoringInstructions = `\n## Context Anchoring\n\nBefore revising your plan:\n1. Add (or update) a \`## Decisions Log\` section at the bottom of the plan.\n2. For each rejected approach from this feedback, add an entry:\n   - **Rejected:** [brief description of the rejected approach]  **Why:** [reason from this feedback]\n3. Once added, do NOT re-propose approaches listed in the Decisions Log — it is your cross-session memory.\n`;
+
+  return `YOUR PLAN WAS NOT APPROVED.\n\nYou MUST revise the plan to address ALL of the feedback below before calling ${toolName} again.\n\nRules:\n${planFileRule}- Do not resubmit the same plan unchanged.\n- Do NOT change the plan title (first # heading) unless the user explicitly asks you to.\n${contextAnchoringInstructions}\n${feedback || "Plan changes requested"}`;
 };