feat: add placeholder main.py for BYO agent on project create #629

Closed
Closed
feat: add placeholder main.py for BYO agent on project create#629
Labels
enhancementNew feature or request

Description

@notgitika
notgitika
opened on Mar 24, 2026

Description

When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:

Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.

Acceptance Criteria

  • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
  • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
  • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box

Additional Context

Current behavior screenshot from agentcore create with BYO agent:

Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      feat: add placeholder main.py for BYO agent on project create #629
      Closed
      Closed
      feat: add placeholder main.py for BYO agent on project create#629
      Labels
      enhancementNew feature or request
      Description
      @notgitika
      notgitika
      opened on Mar 24, 2026
      Description
      When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
      Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

      This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
      Acceptance Criteria
      • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
      • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
      • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
      Additional Context
      Current behavior screenshot from agentcore create with BYO agent:
      Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

      The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
      Metadata
      Metadata
      Assignees
      No one assigned
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        enhancementNew feature or request
        Type
        No type
        Projects
        No projects
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          No milestone
          Relationships
          None yet
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          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          feat: add placeholder main.py for BYO agent on project create #629
          Closed
          Closed
          feat: add placeholder main.py for BYO agent on project create#629
          Labels
          enhancementNew feature or request
          Description
          @notgitika
          notgitika
          opened on Mar 24, 2026
          Description
          When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
          Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

          This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
          Acceptance Criteria
          • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
          • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
          • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
          Additional Context
          Current behavior screenshot from agentcore create with BYO agent:
          Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

          The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            enhancementNew feature or request
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              feat: add placeholder main.py for BYO agent on project create #629
              Closed
              Closed
              feat: add placeholder main.py for BYO agent on project create#629
              Labels
              enhancementNew feature or request
              Description
              @notgitika
              notgitika
              opened on Mar 24, 2026
              Description
              When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
              Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

              This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
              Acceptance Criteria
              • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
              • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
              • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
              Additional Context
              Current behavior screenshot from agentcore create with BYO agent:
              Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

              The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                enhancementNew feature or request
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  feat: add placeholder main.py for BYO agent on project create #629
                  Closed
                  Closed
                  feat: add placeholder main.py for BYO agent on project create#629
                  Labels
                  enhancementNew feature or request
                  Description
                  @notgitika
                  notgitika
                  opened on Mar 24, 2026
                  Description
                  When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
                  Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

                  This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
                  Acceptance Criteria
                  • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
                  • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
                  • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
                  Additional Context
                  Current behavior screenshot from agentcore create with BYO agent:
                  Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

                  The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    enhancementNew feature or request
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      feat: add placeholder main.py for BYO agent on project create #629
                      Closed
                      Closed
                      feat: add placeholder main.py for BYO agent on project create#629
                      Labels
                      enhancementNew feature or request
                      Description
                      @notgitika
                      notgitika
                      opened on Mar 24, 2026
                      Description
                      When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
                      Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

                      This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
                      Acceptance Criteria
                      • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
                      • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
                      • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
                      Additional Context
                      Current behavior screenshot from agentcore create with BYO agent:
                      Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

                      The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        enhancementNew feature or request
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          feat: add placeholder main.py for BYO agent on project create #629
                          Closed
                          Closed
                          feat: add placeholder main.py for BYO agent on project create#629
                          Labels
                          enhancementNew feature or request
                          Description
                          @notgitika
                          notgitika
                          opened on Mar 24, 2026
                          Description
                          When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
                          Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

                          This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
                          Acceptance Criteria
                          • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
                          • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
                          • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
                          Additional Context
                          Current behavior screenshot from agentcore create with BYO agent:
                          Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

                          The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            enhancementNew feature or request
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              feat: add placeholder main.py for BYO agent on project create #629
                              Closed
                              Closed
                              feat: add placeholder main.py for BYO agent on project create#629
                              Labels
                              enhancementNew feature or request
                              Description
                              @notgitika
                              notgitika
                              opened on Mar 24, 2026
                              Description
                              When a user creates a project with "Bring your own agent" (--type byo), the agent code directory (app/<AgentName>/) is left completely empty. The CLI output tells the user:
                              Copy your agent code to app/MyAgent/ before deploying.
Ensure main.py is the entrypoint file in that folder.

                              This is confusing — the user has to know to create main.py themselves. A better experience would be to vend a minimal placeholder main.py with a basic entrypoint stub so the directory isn't empty and the user has a starting point.
                              Acceptance Criteria
                              • When "Bring your own agent" is selected during agentcore create or agentcore add agent --type byo, a placeholder main.py is created in the agent's code directory
                              • The placeholder should contain a minimal working entrypoint (e.g., a simple handler function with a TODO comment)
                              • The placeholder should match the expected entrypoint contract so agentcore dev works out of the box
                              Additional Context
                              Current behavior screenshot from agentcore create with BYO agent:
                              Created:
SampleAgents/
app/MyAgent/ Agent code location (empty)
agentcore/ Config and CDK project

                              The (empty) note highlights the gap — every other agent type gets template code vended, but BYO gets nothing.
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                enhancementNew feature or request
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions