diff --git a/package.json b/package.json
index cd02e3746..8166acb2d 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "test": "npm run test:schemas && npm run test:refs && npm run test:install && npm run validate:schemas && npm run lint && npm run lint:md && npm run format:check",
     "test:coverage": "c8 --reporter=text --reporter=html npm run test:schemas",
     "test:install": "node test/test-installation-components.js",
+    "test:monorepo": "node test/test-monorepo-validation.js",
     "test:refs": "node test/test-file-refs-csv.js",
     "test:schemas": "node test/test-agent-schema.js",
     "validate:refs": "node tools/validate-file-refs.js",
diff --git a/src/bmm/workflows/3-solutioning/check-implementation-readiness/workflow.md b/src/bmm/workflows/3-solutioning/check-implementation-readiness/workflow.md
index 49d2afab9..c00edab53 100644
--- a/src/bmm/workflows/3-solutioning/check-implementation-readiness/workflow.md
+++ b/src/bmm/workflows/3-solutioning/check-implementation-readiness/workflow.md
@@ -42,9 +42,14 @@ description: 'Critical validation workflow that assesses PRD, Architecture, and
 
 ## INITIALIZATION SEQUENCE
 
-### 1. Module Configuration Loading
+### 1. Configuration Loading
 
-Load and read full config from {project-root}/_bmad/bmm/config.yaml and resolve:
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
 
 - `project_name`, `output_folder`, `planning_artifacts`, `user_name`, `communication_language`, `document_output_language`
 - ✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with the config `{communication_language}`
diff --git a/src/bmm/workflows/3-solutioning/create-epics-and-stories/workflow.md b/src/bmm/workflows/3-solutioning/create-epics-and-stories/workflow.md
index a0e232ab8..389eb6b7e 100644
--- a/src/bmm/workflows/3-solutioning/create-epics-and-stories/workflow.md
+++ b/src/bmm/workflows/3-solutioning/create-epics-and-stories/workflow.md
@@ -48,7 +48,12 @@ This uses **step-file architecture** for disciplined execution:
 
 ### 1. Configuration Loading
 
-Load and read full config from {project-root}/_bmad/bmm/config.yaml and resolve:
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project` exists.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
 
 - `project_name`, `output_folder`, `planning_artifacts`, `user_name`, `communication_language`, `document_output_language`
 - ✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with the config `{communication_language}`
diff --git a/src/bmm/workflows/4-implementation/correct-course/instructions.md b/src/bmm/workflows/4-implementation/correct-course/instructions.md
index bbe2c21e0..9556de401 100644
--- a/src/bmm/workflows/4-implementation/correct-course/instructions.md
+++ b/src/bmm/workflows/4-implementation/correct-course/instructions.md
@@ -40,6 +40,14 @@
     - [x] Done - Item completed successfully
     - [N/A] Skip - Item not applicable to this change
     - [!] Action-needed - Item requires attention or follow-up
+### 1. Configuration Loading
+
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
   <action>Maintain running notes of findings and impacts discovered</action>
   <action>Present checklist progress after each major section</action>
 
diff --git a/src/bmm/workflows/document-project/instructions.md b/src/bmm/workflows/document-project/instructions.md
index 0354be610..a81289012 100644
--- a/src/bmm/workflows/document-project/instructions.md
+++ b/src/bmm/workflows/document-project/instructions.md
@@ -79,6 +79,15 @@
 
 </step>
 
+## 1. Configuration Loading
+
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
+
 <step n="3" goal="Check for existing documentation and determine workflow mode" if="resume_mode == false">
 <action>Check if {project_knowledge}/index.md exists</action>
 
diff --git a/src/bmm/workflows/document-project/workflows/deep-dive-instructions.md b/src/bmm/workflows/document-project/workflows/deep-dive-instructions.md
index 637621c4c..85b9e2887 100644
--- a/src/bmm/workflows/document-project/workflows/deep-dive-instructions.md
+++ b/src/bmm/workflows/document-project/workflows/deep-dive-instructions.md
@@ -250,8 +250,14 @@ Detailed exhaustive analysis of specific areas:
 
 - Complete file inventory with all exports
 - Dependency graph and data flow
-- Integration points and API contracts
-- Testing analysis and coverage
+### 1. Configuration Loading
+
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
 - Related code and reuse opportunities
 - Implementation guidance
 
diff --git a/src/bmm/workflows/document-project/workflows/full-scan-instructions.md b/src/bmm/workflows/document-project/workflows/full-scan-instructions.md
index 8a3621d21..b55ac3b77 100644
--- a/src/bmm/workflows/document-project/workflows/full-scan-instructions.md
+++ b/src/bmm/workflows/document-project/workflows/full-scan-instructions.md
@@ -95,6 +95,16 @@ Your choice [1/2/3]:
 - Best for: Quick project overview, initial understanding
 - File reading: Minimal (configs, README, package.json, etc.)
 
+## 1. Configuration Loading
+
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
+json, etc.)
+
 **2. Deep Scan** (10-30 minutes)
 
 - Reads files in critical directories based on project type
diff --git a/src/bmm/workflows/qa/automate/instructions.md b/src/bmm/workflows/qa/automate/instructions.md
index 03653337f..dd0c91877 100644
--- a/src/bmm/workflows/qa/automate/instructions.md
+++ b/src/bmm/workflows/qa/automate/instructions.md
@@ -18,6 +18,15 @@ Check project for existing test framework:
   - Search online for current recommended test framework for that stack
   - Suggest the meta framework and use it (or ask user to confirm)
 
+### 1. Configuration Loading
+
+Load and read full config from {main_config} and resolve basic variables.
+
+**Monorepo Context Check:**
+1. Check if `_bmad/.current_project exists`.
+2. If it exists, read its content as `{project_suffix}` and override output folder:
+   - `output_folder`: `{project-root}/_bmad-output/{project_suffix}`
+
 ### Step 1: Identify Features
 
 Ask user what to test:
diff --git a/test/test-monorepo-validation.js b/test/test-monorepo-validation.js
new file mode 100644
index 000000000..bab840708
--- /dev/null
+++ b/test/test-monorepo-validation.js
@@ -0,0 +1,129 @@
+/**
+ * Monorepo Support Validation Tests
+ *
+ * Verifies that:
+ * 1. The set-project workflow is correctly registered.
+ * 2. All core and BMM workflows contain the monorepo context logic.
+ */
+
+const fs = require('fs-extra');
+const path = require('node:path');
+const glob = require('glob');
+
+// ANSI colors
+const colors = {
+  reset: '\u001B[0m',
+  green: '\u001B[32m',
+  red: '\u001B[31m',
+  yellow: '\u001B[33m',
+  cyan: '\u001B[36m',
+  dim: '\u001B[2m',
+};
+
+let passed = 0;
+let failed = 0;
+
+function assert(condition, testName, errorMessage = '') {
+  if (condition) {
+    console.log(`${colors.green}✓${colors.reset} ${testName}`);
+    passed++;
+  } else {
+    console.log(`${colors.red}✗${colors.reset} ${testName}`);
+    if (errorMessage) {
+      console.log(`  ${colors.dim}${errorMessage}${colors.reset}`);
+    }
+    failed++;
+  }
+}
+
+async function runTests() {
+  console.log(`${colors.cyan}========================================`);
+  console.log('Monorepo Support Validation Tests');
+  console.log(`========================================${colors.reset}\n`);
+
+  const projectRoot = path.join(__dirname, '..');
+
+  // 1. Verify set-project registration
+  console.log(`${colors.yellow}Test Suite 1: Workflow Registration${colors.reset}\n`);
+  try {
+    const csvPath = path.join(projectRoot, 'src/bmm/module-help.csv');
+    const content = await fs.readFile(csvPath, 'utf8');
+    assert(content.includes('set-project'), 'set-project workflow is registered in module-help.csv');
+  } catch (error) {
+    assert(false, 'Registration check failed', error.message);
+  }
+
+  console.log('');
+
+  // 2. Verify context logic in workflows
+  console.log(`${colors.yellow}Test Suite 2: Workflow Context Logic${colors.reset}\n`);
+
+  const workflowFiles = glob.sync('src/{core,bmm}/workflows/**/*.{md,xml}', { cwd: projectRoot });
+
+  // Workflows that MUST have the check
+  const requiredWorkflows = [
+    'brainstorming',
+    'party-mode',
+    'create-product-brief',
+    'create-prd',
+    'create-architecture',
+    'code-review',
+    'create-story',
+    'dev-story',
+    'set-project', // Should not have the check itself, but let's exclude it
+  ];
+
+  for (const file of workflowFiles) {
+    const basename = path.basename(path.dirname(file));
+    if (basename === 'set-project' || basename === '0-context') continue;
+
+    const content = await fs.readFile(path.join(projectRoot, file), 'utf8');
+    const isXml = file.endsWith('.xml');
+
+    if (isXml) {
+      assert(content.includes('_bmad/.current_project'), `XML workflow contains context check: ${file}`);
+    } else {
+      // Only check Markdown files that look like main workflow/instruction files
+      const filename = path.basename(file);
+      if (filename.includes('workflow') || filename.includes('instructions')) {
+        assert(content.includes('_bmad/.current_project'), `Markdown workflow contains context check: ${file}`);
+      }
+    }
+  }
+
+  console.log('');
+
+  // 3. Verify set-project implementation
+  console.log(`${colors.yellow}Test Suite 3: set-project Implementation${colors.reset}\n`);
+  try {
+    const setProjectPath = path.join(projectRoot, 'src/bmm/workflows/0-context/set-project/workflow.md');
+    const exists = await fs.pathExists(setProjectPath);
+    assert(exists, 'set-project workflow file exists');
+    if (exists) {
+      const content = await fs.readFile(setProjectPath, 'utf8');
+      assert(content.includes('_bmad/.current_project'), 'set-project implementation manages .current_project');
+    }
+  } catch (error) {
+    assert(false, 'set-project check failed', error.message);
+  }
+
+  console.log('\n');
+  console.log(`${colors.cyan}========================================`);
+  console.log('Test Results:');
+  console.log(`  Passed: ${colors.green}${passed}${colors.reset}`);
+  console.log(`  Failed: ${colors.red}${failed}${colors.reset}`);
+  console.log(`========================================${colors.reset}\n`);
+
+  if (failed === 0) {
+    console.log(`${colors.green}✨ All monorepo validation tests passed!${colors.reset}\n`);
+    process.exit(0);
+  } else {
+    console.log(`${colors.red}❌ Some monorepo validation tests failed${colors.reset}\n`);
+    process.exit(1);
+  }
+}
+
+runTests().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});