diff --git a/src/__tests__/instructionBuilder.test.ts b/src/__tests__/instructionBuilder.test.ts
index 3a57ade..b5c906d 100644
--- a/src/__tests__/instructionBuilder.test.ts
+++ b/src/__tests__/instructionBuilder.test.ts
@@ -77,7 +77,7 @@ describe('instruction-builder', () => {
   });
 
   describe('report_dir replacement', () => {
-    it('should replace .takt/reports/{report_dir} with full absolute path', () => {
+    it('should replace {report_dir} in paths keeping them relative', () => {
       const step = createMinimalStep(
         '- Report Directory: .takt/reports/{report_dir}/'
       );
@@ -89,31 +89,31 @@ describe('instruction-builder', () => {
       const result = buildInstruction(step, context);
 
       expect(result).toContain(
-        '- Report Directory: /project/.takt/reports/20260128-test-report/'
+        '- Report Directory: .takt/reports/20260128-test-report/'
       );
     });
 
-    it('should use projectCwd for report path when cwd is a worktree', () => {
+    it('should not leak projectCwd absolute path into instruction', () => {
       const step = createMinimalStep(
         '- Report: .takt/reports/{report_dir}/00-plan.md'
       );
       const context = createMinimalContext({
-        cwd: '/project/.takt/worktrees/my-task',
+        cwd: '/clone/my-task',
         projectCwd: '/project',
         reportDir: '20260128-worktree-report',
       });
 
       const result = buildInstruction(step, context);
 
+      // Path should be relative, not absolute with projectCwd
       expect(result).toContain(
-        '- Report: /project/.takt/reports/20260128-worktree-report/00-plan.md'
+        '- Report: .takt/reports/20260128-worktree-report/00-plan.md'
       );
-      expect(result).toContain('Working Directory: /project/.takt/worktrees/my-task');
-      // Project Root should NOT be included in metadata (to avoid agent confusion)
-      expect(result).not.toContain('Project Root');
+      expect(result).not.toContain('/project/.takt/reports/');
+      expect(result).toContain('Working Directory: /clone/my-task');
     });
 
-    it('should replace multiple .takt/reports/{report_dir} occurrences', () => {
+    it('should replace multiple {report_dir} occurrences', () => {
       const step = createMinimalStep(
         '- Scope: .takt/reports/{report_dir}/01-scope.md\n- Decisions: .takt/reports/{report_dir}/02-decisions.md'
       );
@@ -125,8 +125,9 @@ describe('instruction-builder', () => {
 
       const result = buildInstruction(step, context);
 
-      expect(result).toContain('/project/.takt/reports/20260128-multi/01-scope.md');
-      expect(result).toContain('/project/.takt/reports/20260128-multi/02-decisions.md');
+      expect(result).toContain('.takt/reports/20260128-multi/01-scope.md');
+      expect(result).toContain('.takt/reports/20260128-multi/02-decisions.md');
+      expect(result).not.toContain('/project/.takt/reports/');
     });
 
     it('should replace standalone {report_dir} with directory name only', () => {
@@ -141,22 +142,6 @@ describe('instruction-builder', () => {
 
       expect(result).toContain('Report dir name: 20260128-standalone');
     });
-
-    it('should fall back to cwd when projectCwd is not provided', () => {
-      const step = createMinimalStep(
-        '- Dir: .takt/reports/{report_dir}/'
-      );
-      const context = createMinimalContext({
-        cwd: '/fallback-project',
-        reportDir: '20260128-fallback',
-      });
-
-      const result = buildInstruction(step, context);
-
-      expect(result).toContain(
-        '- Dir: /fallback-project/.takt/reports/20260128-fallback/'
-      );
-    });
   });
 
   describe('buildExecutionMetadata', () => {
diff --git a/src/workflow/engine.ts b/src/workflow/engine.ts
index db76a1a..ae61595 100644
--- a/src/workflow/engine.ts
+++ b/src/workflow/engine.ts
@@ -3,7 +3,7 @@
  */
 
 import { EventEmitter } from 'node:events';
-import { mkdirSync, existsSync } from 'node:fs';
+import { mkdirSync, existsSync, symlinkSync } from 'node:fs';
 import { join } from 'node:path';
 import type {
   WorkflowConfig,
@@ -79,6 +79,18 @@ export class WorkflowEngine extends EventEmitter {
     if (!existsSync(reportDirPath)) {
       mkdirSync(reportDirPath, { recursive: true });
     }
+
+    // Worktree mode: create symlink so agents can access reports via relative path
+    if (this.cwd !== this.projectCwd) {
+      const cwdReportsDir = join(this.cwd, '.takt', 'reports');
+      if (!existsSync(cwdReportsDir)) {
+        mkdirSync(join(this.cwd, '.takt'), { recursive: true });
+        symlinkSync(
+          join(this.projectCwd, '.takt', 'reports'),
+          cwdReportsDir,
+        );
+      }
+    }
   }
 
   /** Validate workflow configuration at construction time */
diff --git a/src/workflow/instruction-builder.ts b/src/workflow/instruction-builder.ts
index 5b6a7dd..72bee38 100644
--- a/src/workflow/instruction-builder.ts
+++ b/src/workflow/instruction-builder.ts
@@ -5,7 +5,6 @@
  * template placeholders with actual values.
  */
 
-import { join } from 'node:path';
 import type { WorkflowStep, AgentResponse, Language } from '../models/types.js';
 import { getGitDiff } from '../agents/runner.js';
 
@@ -180,14 +179,11 @@ export function buildInstruction(
     escapeTemplateChars(userInputsStr)
   );
 
-  // Replace .takt/reports/{report_dir} with absolute path first,
-  // then replace standalone {report_dir} with the directory name.
-  // This ensures agents always use the correct project root for reports,
-  // even when their cwd is a clone.
+  // Replace {report_dir} with the directory name, keeping paths relative.
+  // In worktree mode, a symlink from cwd/.takt/reports → projectCwd/.takt/reports
+  // ensures the relative path resolves correctly without embedding absolute paths
+  // that could cause agents to operate on the wrong repository.
   if (context.reportDir) {
-    const projectRoot = context.projectCwd ?? context.cwd;
-    const reportDirFullPath = join(projectRoot, '.takt', 'reports', context.reportDir);
-    instruction = instruction.replace(/\.takt\/reports\/\{report_dir\}/g, reportDirFullPath);
     instruction = instruction.replace(/\{report_dir\}/g, context.reportDir);
   }