ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067

Open
Open
ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
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finding

Description

@os-sam
os-sam
opened on Aug 31, 2026

Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.

Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.

What was measured (on 85b495795, during the #5934 census)

packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:

onFailure?: ActionDef | ActionDef[];

read at the end of handlePostExecution and dispatched through executeChain when result.success is false.

  1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
  2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.

Why record it rather than ride it into #5934

The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:

  • retire it like onSuccess (dead published surface, startup scope discipline), or
  • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).

Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.

Refs: #5934 · PR #7065

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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
      ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
      Open
      Open
      ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
      Labels
      finding
      Description
      @os-sam
      os-sam
      opened on Aug 31, 2026
      Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
      Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
      What was measured (on 85b495795, during the #5934 census)
      packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
      onFailure?: ActionDef | ActionDef[];

      read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
      1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
      2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
      Why record it rather than ride it into #5934
      The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
      • retire it like onSuccess (dead published surface, startup scope discipline), or
      • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
      Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
      Refs: #5934 · PR #7065
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, '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
          ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
          Open
          Open
          ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
          Labels
          finding
          Description
          @os-sam
          os-sam
          opened on Aug 31, 2026
          Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
          Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
          What was measured (on 85b495795, during the #5934 census)
          packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
          onFailure?: ActionDef | ActionDef[];

          read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
          1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
          2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
          Why record it rather than ride it into #5934
          The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
          • retire it like onSuccess (dead published surface, startup scope discipline), or
          • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
          Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
          Refs: #5934 · PR #7065
          Metadata
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, '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
              ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
              Open
              Open
              ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
              Labels
              finding
              Description
              @os-sam
              os-sam
              opened on Aug 31, 2026
              Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
              Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
              What was measured (on 85b495795, during the #5934 census)
              packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
              onFailure?: ActionDef | ActionDef[];

              read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
              1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
              2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
              Why record it rather than ride it into #5934
              The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
              • retire it like onSuccess (dead published surface, startup scope discipline), or
              • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
              Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
              Refs: #5934 · PR #7065
              Metadata
              Metadata
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              No one assigned
                Labels
                finding
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, '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
                  ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
                  Open
                  Open
                  ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
                  Labels
                  finding
                  Description
                  @os-sam
                  os-sam
                  opened on Aug 31, 2026
                  Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
                  Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
                  What was measured (on 85b495795, during the #5934 census)
                  packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
                  onFailure?: ActionDef | ActionDef[];

                  read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
                  1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
                  2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
                  Why record it rather than ride it into #5934
                  The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
                  • retire it like onSuccess (dead published surface, startup scope discipline), or
                  • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
                  Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
                  Refs: #5934 · PR #7065
                  Metadata
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                  No one assigned
                    Labels
                    finding
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                    No type
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                    No projects
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                      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
                      ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
                      Open
                      Open
                      ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
                      Labels
                      finding
                      Description
                      @os-sam
                      os-sam
                      opened on Aug 31, 2026
                      Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
                      Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
                      What was measured (on 85b495795, during the #5934 census)
                      packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
                      onFailure?: ActionDef | ActionDef[];

                      read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
                      1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
                      2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
                      Why record it rather than ride it into #5934
                      The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
                      • retire it like onSuccess (dead published surface, startup scope discipline), or
                      • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
                      Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
                      Refs: #5934 · PR #7065
                      Metadata
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                      No one assigned
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                          No branches or pull requests
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, '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
                          ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
                          Open
                          Open
                          ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
                          Labels
                          finding
                          Description
                          @os-sam
                          os-sam
                          opened on Aug 31, 2026
                          Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
                          Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
                          What was measured (on 85b495795, during the #5934 census)
                          packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
                          onFailure?: ActionDef | ActionDef[];

                          read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
                          1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
                          2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
                          Why record it rather than ride it into #5934
                          The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
                          • retire it like onSuccess (dead published surface, startup scope discipline), or
                          • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
                          Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
                          Refs: #5934 · PR #7065
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, '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); }
})();
})();

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                              ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart #7067
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                              ActionDef.onFailure is the surviving twin of the retired onSuccess callback channel — zero producers, no spec counterpart#7067
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                              @os-sam
                              os-sam
                              opened on Aug 31, 2026
                              Filed unassigned by the dev seat implementing #5934 (session session_013hfmP9hoMd3dJwTh85J4yB, branch claude/issue-5934-retire-onsuccess-callback, PR #7065). Observation, not a claim on anyone's time — the #5934 census measured this member too, so recording it saves the next reader the retake.
                              Duplicate-checked against all 266 open issues (repo-scoped REST listing, titles + bodies; /search/issues is unavailable at this seat; positive control: the same grep finds #5934 itself). No open card names onFailure.
                              What was measured (on 85b495795, during the #5934 census)
                              packages/core/src/actions/ActionRunner.ts declares, on the exported ActionDef of @object-ui/core:
                              onFailure?: ActionDef | ActionDef[];

                              read at the end of handlePostExecution and dispatched through executeChain when result.success is false.
                              1. Zero producers. The ActionRunner's legacy ActionDef.onSuccess chained-callback channel is unreachable from validated metadata and has zero producers #5934 writer census (286 onSuccess/onFailure-family hits classified by the "is the value an ActionDef written onto an action object" discriminator, with a positive control on chain) found exactly one writer of a callback-shaped onFailure: the runner's own pin ActionRunner.test.ts ("should execute onFailure callback after failure"). Everything else is React form callbacks on other surfaces, or @object-ui/types' separate Phase-2 ActionCallback declarations.
                              2. No spec counterpart, so no dual meaning. Unlike onSuccess, the pinned @objectstack/spec 17.2.0 declares NO onFailure key on ActionSchema — the key is not authorable at all, so validated metadata cannot reach the channel, and there is no declared meaning for it to converge on. It is a single-meaning, runner-native, unproduced channel on a published type.
                              Why record it rather than ride it into #5934
                              The 2026-08-31 maintainer ruling on #5934 scoped the retirement to onSuccess alone, and PR #7065 explicitly leaves onFailure untouched (stated in the changeset and the ActionDef docblock). Removing onFailure would be its own breaking change to @object-ui/core — the human floor again — and the two obvious directions differ:
                              • retire it like onSuccess (dead published surface, startup scope discipline), or
                              • keep it as the one declared error-side hook until the spec grows an error-side key (it is the only post-failure extension point the runner has; the spec's onSuccess block deliberately has no failure twin).
                              Not asserting a verdict — triage question. The measurement exists; the member is documented as deliberately untouched at its declaration site.
                              Refs: #5934 · PR #7065
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