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[FEATURE]: Mermaid rendering in chat #3366

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[FEATURE]: Mermaid rendering in chat#3366
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@wreed4
wreed4
opened on Oct 22, 2025

Feature hasn't been suggested before.

  • I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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function addCopyButtons() {
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btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
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observer.observe(document.body, { childList: true, subtree: true });
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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
      Skip to content
      [FEATURE]: Mermaid rendering in chat #3366
      Closed
      Closed
      [FEATURE]: Mermaid rendering in chat#3366
      Labels
      discussionUsed for feature requests, proposals, ideas, etc. Open discussion
      Description
      @wreed4
      wreed4
      opened on Oct 22, 2025
      Feature hasn't been suggested before.
      •  I have verified this feature I'm about to request hasn't been suggested before.
      Describe the enhancement you want to request
      Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
          Skip to content
          [FEATURE]: Mermaid rendering in chat #3366
          Closed
          Closed
          [FEATURE]: Mermaid rendering in chat#3366
          Labels
          discussionUsed for feature requests, proposals, ideas, etc. Open discussion
          Description
          @wreed4
          wreed4
          opened on Oct 22, 2025
          Feature hasn't been suggested before.
          •  I have verified this feature I'm about to request hasn't been suggested before.
          Describe the enhancement you want to request
          Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
              Skip to content
              [FEATURE]: Mermaid rendering in chat #3366
              Closed
              Closed
              [FEATURE]: Mermaid rendering in chat#3366
              Labels
              discussionUsed for feature requests, proposals, ideas, etc. Open discussion
              Description
              @wreed4
              wreed4
              opened on Oct 22, 2025
              Feature hasn't been suggested before.
              •  I have verified this feature I'm about to request hasn't been suggested before.
              Describe the enhancement you want to request
              Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
              Metadata
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                discussionUsed for feature requests, proposals, ideas, etc. Open discussion
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                  None yet
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
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try {
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u.searchParams.delete(p);
changed = true;
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if (clean !== a.href) a.href = clean;
});
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});
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});
observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
                  Skip to content
                  [FEATURE]: Mermaid rendering in chat #3366
                  Closed
                  Closed
                  [FEATURE]: Mermaid rendering in chat#3366
                  Labels
                  discussionUsed for feature requests, proposals, ideas, etc. Open discussion
                  Description
                  @wreed4
                  wreed4
                  opened on Oct 22, 2025
                  Feature hasn't been suggested before.
                  •  I have verified this feature I'm about to request hasn't been suggested before.
                  Describe the enhancement you want to request
                  Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
                  Metadata
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                  No one assigned
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                    discussionUsed for feature requests, proposals, ideas, etc. Open discussion
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                      None yet
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                      No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
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// Try immediately
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var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
                      Skip to content
                      [FEATURE]: Mermaid rendering in chat #3366
                      Closed
                      Closed
                      [FEATURE]: Mermaid rendering in chat#3366
                      Labels
                      discussionUsed for feature requests, proposals, ideas, etc. Open discussion
                      Description
                      @wreed4
                      wreed4
                      opened on Oct 22, 2025
                      Feature hasn't been suggested before.
                      •  I have verified this feature I'm about to request hasn't been suggested before.
                      Describe the enhancement you want to request
                      Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
                      Metadata
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                      Assignees
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                        discussionUsed for feature requests, proposals, ideas, etc. Open discussion
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
                          Skip to content
                          [FEATURE]: Mermaid rendering in chat #3366
                          Closed
                          Closed
                          [FEATURE]: Mermaid rendering in chat#3366
                          Labels
                          discussionUsed for feature requests, proposals, ideas, etc. Open discussion
                          Description
                          @wreed4
                          wreed4
                          opened on Oct 22, 2025
                          Feature hasn't been suggested before.
                          •  I have verified this feature I'm about to request hasn't been suggested before.
                          Describe the enhancement you want to request
                          Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
                          Metadata
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
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::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
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::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
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var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
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if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
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applyDarkMode();
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console.log('[Universal Dark Mode] Disabled');
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if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
[FEATURE]: Mermaid rendering in chat · Issue #3366 · anomalyco/opencode · GitHub
                              Skip to content
                              [FEATURE]: Mermaid rendering in chat #3366
                              Closed
                              Closed
                              [FEATURE]: Mermaid rendering in chat#3366
                              Labels
                              discussionUsed for feature requests, proposals, ideas, etc. Open discussion
                              Description
                              @wreed4
                              wreed4
                              opened on Oct 22, 2025
                              Feature hasn't been suggested before.
                              •  I have verified this feature I'm about to request hasn't been suggested before.
                              Describe the enhancement you want to request
                              Is there any interest in getting mermaid diagrams to render in the Chat UI?? I've found it to be really useful to ask opencode to diagram code flows or documented processes for me to understand them at a glance, but it tends to do that with ascii art. When I ask it to do it in mermaid it does, but the UI doesn't render it. It'd be useful to get it to natively support mermaid so I can more easily export those and put them into files or reminders. It's not critical since it's easy enough to get the LLM to go back and forth, but it'd be a nice feature IMO.
                              Metadata
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