Explain unclosed Mustache tag errors in scorer templates - #203

Merged
paultancre-bt merged 1 commit into
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fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged

Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom
fix/mustache-unclosed-tag-scorer

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@paultancre-btpaultancre-bt commented Jul 2, 2026

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LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).

This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:

Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.

Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.

Note: the Python side uses chevron (different error format) and is unaffected.

Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions

github-actionsBot commented Jul 2, 2026•
edited
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Braintrust eval report

Autoevals (HEAD-1783000888)

ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴

@paultancre-bt
paultancre-bt merged commit 46e51ad into mainJul 9, 2026
15 checks passed
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edited
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Braintrust eval report

Autoevals (main-1783584685)

ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴

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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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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Contributor
LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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@paultancre-bt@cpinn

, '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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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Contributor
LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
Sign up for freeto join this conversation on GitHub.
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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@paultancre-bt@cpinn

, '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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
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LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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, '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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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Contributor
LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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@paultancre-bt@cpinn

, '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
Explain unclosed Mustache tag errors in scorer templates - #203
Merged
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Jul 9, 2026
Merged
Explain unclosed Mustache tag errors in scorer templates#203
paultancre-bt merged 1 commit into
mainfrom 
fix/mustache-unclosed-tag-scorer
Conversation
@paultancre-bt
@paultancre-btpaultancre-bt
commented
Jul 2, 2026

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Contributor
LLM-judge scorer templates render through renderMessages, which calls raw mustache.render. When a scorer template has an unclosed tag, users get the bare Unclosed tag at 216 — where the number is a character offset that reads as a line number. This is the error that surfaces in playground eval traces (the scorer step fails after the task prompt already succeeded).
This mirrors the enrichment we added to the api-ts proxy renderer: convert the offset to line/column and append the nearby template text, e.g.:
Unclosed tag at 57 (line 3, column 21, near "…{output}}\nExpected: {{expected…"). Check for an unclosed {{ }} tag or {{#section}} block in the template.
Non-string message content is still rendered exactly as before; only the error path changed. Test added in render-messages.test.ts.
Note: the Python side uses chevron (different error format) and is unaffected.
Paul Tancre@claude
Explain unclosed Mustache tag errors in scorer templates
b91863c
renderMessages surfaced the raw mustache error ("Unclosed tag at 216"),
whose number is a character offset users read as a line number. Convert
it to line/column plus a nearby snippet, matching the proxy renderer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@github-actions
github-actionsBot
commented
Jul 2, 2026•

edited

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Braintrust eval report
Autoevals (HEAD-1783000888)
ScoreAverageImprovementsRegressions
NumericDiff78.5% (+0pp)9 🟢11 🔴
Time_to_first_token10.03tok (-0.38tok)143 🟢76 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens470.35tok (+3.93tok)97 🟢107 🔴
Completion_reasoning_tokens358.69tok (+4.36tok)84 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens998.77tok (+3.93tok)97 🟢107 🔴
Estimated_cost0$ (+0$)88 🟢92 🔴
Duration10.05s (-0.35s)143 🟢76 🔴
Llm_duration12.11s (+0.79s)106 🟢113 🔴
@paultancre-bt
paultancre-bt
merged commit 46e51ad
into
mainJul 9, 2026

15 checks passed

@github-actions
github-actionsBot
commented
Jul 9, 2026•

edited

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Braintrust eval report
Autoevals (main-1783584685)
ScoreAverageImprovementsRegressions
NumericDiff78.1% (0pp)6 🟢8 🔴
Time_to_first_token11.69tok (+1.66tok)56 🟢163 🔴
Llm_calls1.55 (+0)--
Tool_calls0 (+0)--
Errors0 (+0)--
Llm_errors0 (+0)--
Tool_errors0 (+0)--
Prompt_tokens528.42tok (+0tok)--
Prompt_cached_tokens0tok (+0tok)--
Prompt_cache_creation_tokens0tok (+0tok)--
Prompt_cache_creation_5m_tokens0tok (+0tok)--
Prompt_cache_creation_1h_tokens0tok (+0tok)--
Completion_tokens474.75tok (+4.4tok)94 🟢112 🔴
Completion_reasoning_tokens360.44tok (+1.75tok)91 🟢89 🔴
Completion_accepted_prediction_tokens0tok (+0tok)--
Completion_rejected_prediction_tokens0tok (+0tok)--
Completion_audio_tokens0tok (+0tok)--
Total_tokens1003.17tok (+4.4tok)94 🟢112 🔴
Estimated_cost0$ (+0$)88 🟢96 🔴
Duration11.69s (+1.64s)57 🟢162 🔴
Llm_duration12.41s (+0.31s)92 🟢127 🔴
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@cpinnCaitlin Pinn (cpinn)cpinn approved these changes

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2 participants

@paultancre-bt@cpinn