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feat(scorers): create LLM scorers and classifiers - #307

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Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
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Aug 19, 2026
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feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
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cedric/scorers-create

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@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
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  • cargo-dist-cache

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Comment threadsrc/functions/create.rs

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
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Rebase done

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Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
Skip to content

feat(scorers): create LLM scorers and classifiers - #307

Merged
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create
Aug 19, 2026
Merged

feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create

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@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Comment threadsrc/functions/create.rs

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
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Rebase done

@viadezo1er
Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
Skip to content

feat(scorers): create LLM scorers and classifiers - #307

Merged
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create
Aug 19, 2026
Merged

feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create

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@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Comment threadsrc/functions/create.rs

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
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Rebase done

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Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); 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('^' + ".*" + ' feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
Skip to content

feat(scorers): create LLM scorers and classifiers - #307

Merged
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create
Aug 19, 2026
Merged

feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
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cedric/scorers-create

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@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Comment threadsrc/functions/create.rs

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
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Rebase done

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Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
34 checks passed
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
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feat(scorers): create LLM scorers and classifiers - #307

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feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
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@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
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  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Comment threadsrc/functions/create.rs

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
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Rebase done

@viadezo1er
Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
34 checks passed
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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(); } } // Try immediately tryTheater(); // Try after navigation (SPA) 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('^' + ".*" + ' feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
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feat(scorers): create LLM scorers and classifiers - #307

Merged
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create
Aug 19, 2026
Merged

feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create

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@viadezo1er

@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Reviewed commit:9963a33d87

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Comment threadsrc/functions/create.rs

@QardStephen Belanger (Qard) left a comment

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
@viadezo1er

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Rebase done

@viadezo1er
Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
34 checks passed
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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); } })(); })(); feat(scorers): create LLM scorers and classifiers by viadezo1er · Pull Request #307 · braintrustdata/bt · GitHub
Skip to content

feat(scorers): create LLM scorers and classifiers - #307

Merged
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create
Aug 19, 2026
Merged

feat(scorers): create LLM scorers and classifiers#307
Cedric / ViaDézo1er (viadezo1er) merged 8 commits into
mainfrom
cedric/scorers-create

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@viadezo1er

@viadezo1erCedric / ViaDézo1er (viadezo1er) commented Aug 14, 2026

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Add bt scorers create for prompt-based LLM scorers and classifiers.

Parameter validation is a follow-up partly done in #308, and partly done in https://github.com/braintrustdata/braintrust/pull/18155 (and bt will need tweaking once the braintrust pr is merged).
At the moment it is possible to pass incorrect parameters to the scorers, and sometimes the web ui will even show them:

bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --temperature 1000 --reasoning-effort none
Screenshot 2026-08-14 at 16 16 22

bt-scorer-messages.json:

[
{
"role": "system",
"content": "You are a strict evaluator. Compare the candidate answer with the expected answer. Return exactly PASS or FAIL."
},
{
"role": "user",
"content": "Question: {{input.question}}\nExpected answer: {{expected}}\nCandidate answer: {{output}}"
}
]
❯ bt scorers create "Demo answer correctness" \
--slug demo-answer-correctness \
--description "Synthetic scorer used to demonstrate bt scorers create" \
--model gpt-5.4-nano \
--messages @/tmp/bt-scorer-messages.json \
--choice-scores '{"PASS":1,"FAIL":0}' \
--use-cot=false \
--pass-threshold 0.5 \
--metadata 'purpose: synthetic-demo' \
--if-exists replace --json|jq
{
"found_existing": true,
"id": "6681c294-0ab3-489b-b979-33351add071d",
"ignored": false,
"project_id": "b667bd4c-7e55-49e0-a370-f6526e6bbccd",
"slug": "demo-answer-correctness",
"version": "1000197688638740786"
}

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Latest downloadable build artifacts for this PR commit 7fed7130c346:

Available artifact names
  • artifacts-build-global
  • artifacts-build-local-aarch64-pc-windows-msvc
  • artifacts-build-local-x86_64-pc-windows-msvc
  • artifacts-build-local-x86_64-apple-darwin
  • artifacts-build-local-x86_64-unknown-linux-musl
  • artifacts-build-local-x86_64-unknown-linux-gnu
  • artifacts-build-local-aarch64-apple-darwin
  • artifacts-build-local-aarch64-unknown-linux-gnu
  • artifacts-plan-dist-manifest
  • cargo-dist-cache

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Reviewed commit:9963a33d87

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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  • Mark a draft as ready
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If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "Codex (@codex) address that feedback".

Comment threadsrc/functions/create.rs

@QardStephen Belanger (Qard) left a comment

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Still overall LGTM, though CI still seems to be failing, and looks like it needs a rebase.

@viadezo1er
Cedric / ViaDézo1er (viadezo1er)force-pushed the cedric/scorers-create branch 2 times, most recently from a8f8b84 to e737d2bCompareAugust 18, 2026 20:57
@viadezo1er

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Rebase done

@viadezo1er
Cedric / ViaDézo1er (viadezo1er) merged commit 45b92d3 into mainAug 19, 2026
34 checks passed
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