diff --git a/tools/cli/installers/lib/core/installer.js b/tools/cli/installers/lib/core/installer.js
index 402b5f98..77a8bb35 100644
--- a/tools/cli/installers/lib/core/installer.js
+++ b/tools/cli/installers/lib/core/installer.js
@@ -1920,55 +1920,6 @@ If AgentVibes party mode is enabled, immediately trigger TTS with agent's voice:
           console.log(chalk.dim(`  Created customize: ${moduleName}-${agentName}.customize.yaml`));
         }
       }
-
-      // Read the existing .md file to check for sidecar info
-      let hasSidecar = false;
-      try {
-        const content = await fs.readFile(mdPath, 'utf8');
-        // Look for sidecar metadata in the frontmatter or content
-        hasSidecar = content.includes('hasSidecar') && content.includes('true');
-      } catch {
-        // Continue without sidecar processing
-      }
-
-      // Copy sidecar files if agent has hasSidecar flag
-      if (hasSidecar) {
-        const { copyAgentSidecarFiles } = require('../../../lib/agent/installer');
-
-        // Get agent sidecar folder from core config
-        const coreConfigPath = path.join(bmadDir, 'bmb', 'config.yaml');
-        let agentSidecarFolder;
-
-        if (await fs.pathExists(coreConfigPath)) {
-          const yamlLib = require('yaml');
-          const coreConfigContent = await fs.readFile(coreConfigPath, 'utf8');
-          const coreConfig = yamlLib.parse(coreConfigContent);
-          agentSidecarFolder = coreConfig.agent_sidecar_folder || agentSidecarFolder;
-        }
-
-        // Resolve path variables
-        const resolvedSidecarFolder = agentSidecarFolder
-          .replaceAll('{project-root}', projectDir)
-          .replaceAll('_bmad', this.bmadFolderName || 'bmad');
-
-        // Create sidecar directory for this agent
-        const agentSidecarDir = path.join(resolvedSidecarFolder, agentName);
-        await fs.ensureDir(agentSidecarDir);
-
-        // Find and copy sidecar folder from source module
-        const sourceModulePath = moduleName === 'core' ? getModulePath('core') : getSourcePath(`modules/${moduleName}`);
-        const sourceAgentPath = path.join(sourceModulePath, 'agents');
-
-        // Copy sidecar files (preserve existing, add new)
-        const sidecarResult = copyAgentSidecarFiles(sourceAgentPath, agentSidecarDir, null);
-
-        if (sidecarResult.copied.length > 0) {
-          console.log(chalk.dim(`  Copied ${sidecarResult.copied.length} new sidecar file(s) to: ${agentSidecarDir}`));
-        }
-        if (sidecarResult.preserved.length > 0) {
-          console.log(chalk.dim(`  Preserved ${sidecarResult.preserved.length} existing sidecar file(s)`));
-        }
-      }
     }
   }
 
diff --git a/tools/cli/installers/lib/custom/handler.js b/tools/cli/installers/lib/custom/handler.js
index 1170a8c8..115c4a4c 100644
--- a/tools/cli/installers/lib/custom/handler.js
+++ b/tools/cli/installers/lib/custom/handler.js
@@ -318,7 +318,6 @@ class CustomHandler {
           const { getSourcePath } = require('../../../lib/project-root');
           const genericTemplatePath = getSourcePath('utility', 'agent-components', 'agent.customize.template.yaml');
           if (await fs.pathExists(genericTemplatePath)) {
-            // Copy with placeholder replacement
             let templateContent = await fs.readFile(genericTemplatePath, 'utf8');
             await fs.writeFile(customizePath, templateContent, 'utf8');
             console.log(chalk.dim(`  Created customize: custom-${agentName}.customize.yaml`));
@@ -337,41 +336,6 @@ class CustomHandler {
         // Write the compiled MD file
         await fs.writeFile(targetMdPath, processedXml, 'utf8');
 
-        // Check if agent has sidecar
-        let hasSidecar = false;
-        try {
-          const yamlLib = require('yaml');
-          const agentYaml = yamlLib.parse(yamlContent);
-          hasSidecar = agentYaml?.agent?.metadata?.hasSidecar === true;
-        } catch {
-          // Continue without sidecar processing
-        }
-
-        // Copy sidecar files if agent has hasSidecar flag
-        if (hasSidecar && config.agent_sidecar_folder) {
-          const { copyAgentSidecarFiles } = require('../../../lib/agent/installer');
-
-          // Resolve agent sidecar folder path
-          const projectDir = path.dirname(bmadDir);
-          const resolvedSidecarFolder = config.agent_sidecar_folder
-            .replaceAll('{project-root}', projectDir)
-            .replaceAll('_bmad', path.basename(bmadDir));
-
-          // Create sidecar directory for this agent
-          const agentSidecarDir = path.join(resolvedSidecarFolder, agentName);
-          await fs.ensureDir(agentSidecarDir);
-
-          // Copy sidecar files
-          const sidecarResult = copyAgentSidecarFiles(path.dirname(agentFile), agentSidecarDir, agentFile);
-
-          if (sidecarResult.copied.length > 0) {
-            console.log(chalk.dim(`    Copied ${sidecarResult.copied.length} sidecar file(s) to: ${agentSidecarDir}`));
-          }
-          if (sidecarResult.preserved.length > 0) {
-            console.log(chalk.dim(`    Preserved ${sidecarResult.preserved.length} existing sidecar file(s)`));
-          }
-        }
-
         // Track the file
         if (fileTrackingCallback) {
           fileTrackingCallback(targetMdPath);
diff --git a/tools/cli/installers/lib/modules/manager.js b/tools/cli/installers/lib/modules/manager.js
index d54e2cf3..c6de496e 100644
--- a/tools/cli/installers/lib/modules/manager.js
+++ b/tools/cli/installers/lib/modules/manager.js
@@ -905,35 +905,6 @@ class ModuleManager {
           await fs.writeFile(targetMdPath, xml, 'utf8');
         }
 
-        // Copy sidecar files if agent has hasSidecar flag
-        if (hasSidecar) {
-          const { copyAgentSidecarFiles } = require('../../../lib/agent/installer');
-
-          // Get agent sidecar folder from core config (should always be set)
-          const agentSidecarFolder = this.coreConfig?.agent_sidecar_folder;
-
-          // Resolve path variables
-          const projectDir = path.dirname(bmadDir);
-          const resolvedSidecarFolder = agentSidecarFolder
-            .replaceAll('{project-root}', projectDir)
-            .replaceAll('_bmad', path.basename(bmadDir));
-
-          // Create sidecar directory for this agent
-          const agentSidecarDir = path.join(resolvedSidecarFolder, agentName);
-          await fs.ensureDir(agentSidecarDir);
-
-          // Copy sidecar files (preserve existing, add new)
-          const sidecarResult = copyAgentSidecarFiles(path.dirname(sourceYamlPath), agentSidecarDir, sourceYamlPath);
-          const totalFiles = sidecarResult.copied.length + sidecarResult.preserved.length;
-
-          if (sidecarResult.copied.length > 0) {
-            console.log(chalk.dim(`    Copied ${sidecarResult.copied.length} new sidecar file(s) to: ${agentSidecarDir}`));
-          }
-          if (sidecarResult.preserved.length > 0) {
-            console.log(chalk.dim(`    Preserved ${sidecarResult.preserved.length} existing sidecar file(s)`));
-          }
-        }
-
         console.log(
           chalk.dim(`    Compiled agent: ${agentName} -> ${path.relative(targetPath, targetMdPath)}${hasSidecar ? ' (with sidecar)' : ''}`),
         );
diff --git a/tools/cli/lib/agent/installer.js b/tools/cli/lib/agent/installer.js
index 62b8311f..b55502ed 100644
--- a/tools/cli/lib/agent/installer.js
+++ b/tools/cli/lib/agent/installer.js
@@ -262,129 +262,11 @@ function installAgent(agentInfo, answers, targetPath, options = {}) {
     agentName: metadata.name || agentInfo.name,
     targetDir: agentTargetDir,
     compiledFile: compiledPath,
-    sidecarCopied: false,
   };
 
-  // Handle sidecar files for agents with hasSidecar flag
-  if (agentInfo.hasSidecar === true && agentInfo.type === 'expert') {
-    // Get agent sidecar folder from config or use default
-    const agentSidecarFolder = options.config?.agent_sidecar_folder || '{project-root}/.myagent-data';
-
-    // Resolve path variables
-    const resolvedSidecarFolder = agentSidecarFolder
-      .replaceAll('{project-root}', options.projectRoot || process.cwd())
-      .replaceAll('_bmad', options_bmadFolder || '_bmad');
-
-    // Create sidecar directory for this agent
-    const agentSidecarDir = path.join(resolvedSidecarFolder, agentFolderName);
-    if (!fs.existsSync(agentSidecarDir)) {
-      fs.mkdirSync(agentSidecarDir, { recursive: true });
-    }
-
-    // Find and copy sidecar folder
-    const sidecarFiles = copyAgentSidecarFiles(agentInfo.path, agentSidecarDir, agentInfo.yamlFile);
-    result.sidecarCopied = true;
-    result.sidecarFiles = sidecarFiles;
-    result.sidecarDir = agentSidecarDir;
-  }
-
   return result;
 }
 
-/**
- * Recursively copy sidecar files (everything except the .agent.yaml)
- * @param {string} sourceDir - Source agent directory
- * @param {string} targetDir - Target agent directory
- * @param {string} excludeYaml - The .agent.yaml file to exclude
- * @returns {Array} List of copied files
- */
-function copySidecarFiles(sourceDir, targetDir, excludeYaml) {
-  const copied = [];
-
-  function copyDir(src, dest) {
-    if (!fs.existsSync(dest)) {
-      fs.mkdirSync(dest, { recursive: true });
-    }
-
-    const entries = fs.readdirSync(src, { withFileTypes: true });
-    for (const entry of entries) {
-      const srcPath = path.join(src, entry.name);
-      const destPath = path.join(dest, entry.name);
-
-      // Skip the source YAML file
-      if (srcPath === excludeYaml) {
-        continue;
-      }
-
-      if (entry.isDirectory()) {
-        copyDir(srcPath, destPath);
-      } else {
-        fs.copyFileSync(srcPath, destPath);
-        copied.push(destPath);
-      }
-    }
-  }
-
-  copyDir(sourceDir, targetDir);
-  return copied;
-}
-
-/**
- * Find and copy agent sidecar folders
- * @param {string} sourceDir - Source agent directory
- * @param {string} targetSidecarDir - Target sidecar directory for the agent
- * @param {string} excludeYaml - The .agent.yaml file to exclude
- * @returns {Array} List of copied files
- */
-function copyAgentSidecarFiles(sourceDir, targetSidecarDir, excludeYaml) {
-  const copied = [];
-  const preserved = [];
-
-  // Find folders with "sidecar" in the name
-  const entries = fs.readdirSync(sourceDir, { withFileTypes: true });
-
-  for (const entry of entries) {
-    if (entry.isDirectory() && entry.name.toLowerCase().includes('sidecar')) {
-      const sidecarSourcePath = path.join(sourceDir, entry.name);
-
-      // Recursively sync the sidecar folder contents (preserve existing, add new)
-      function syncSidecarDir(src, dest) {
-        if (!fs.existsSync(dest)) {
-          fs.mkdirSync(dest, { recursive: true });
-        }
-
-        // Get all files in source
-        const sourceEntries = fs.readdirSync(src, { withFileTypes: true });
-
-        for (const sourceEntry of sourceEntries) {
-          const srcPath = path.join(src, sourceEntry.name);
-          const destPath = path.join(dest, sourceEntry.name);
-
-          if (sourceEntry.isDirectory()) {
-            // Recursively sync subdirectories
-            syncSidecarDir(srcPath, destPath);
-          } else {
-            // Check if file already exists in destination
-            if (fs.existsSync(destPath)) {
-              // File exists - preserve it
-              preserved.push(destPath);
-            } else {
-              // File doesn't exist - copy it
-              fs.copyFileSync(srcPath, destPath);
-              copied.push(destPath);
-            }
-          }
-        }
-      }
-
-      syncSidecarDir(sidecarSourcePath, targetSidecarDir);
-    }
-  }
-
-  // Return info about what was preserved and what was copied
-  return { copied, preserved };
-}
-
 /**
  * Update agent metadata ID to reflect installed location
  * @param {string} compiledContent - Compiled XML content
@@ -820,8 +702,6 @@ module.exports = {
   loadAgentConfig,
   promptInstallQuestions,
   installAgent,
-  copySidecarFiles,
-  copyAgentSidecarFiles,
   updateAgentId,
   detectBmadProject,
   addToManifest,