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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Critical Hub-Node Navigation — Avinash Principle Clinical Strategist</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
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<h1>Critical Hub-Node Navigation</h1>
<span class="rx"><a href="https://classworkdecjan.blogspot.com/2026/07/the-avinash-principle-critical-hub-node.html" target="_blank" rel="noopener" style="color:inherit;text-decoration:underline;">The Avinash Principle</a> · find the handful of nodes that decide the outcome</span>
</div>
<div class="top-right">
<select id="themeSelect" class="theme-select" aria-label="Theme">
<option value="simple">Simple</option>
<option value="minimalist">Minimalist</option>
<option value="terminal">Terminal</option>
</select>
<div class="tagline">critical hub-node analysis · not for patient care</div>
<div class="top-links">
<a href="https://avi33tbtt.github.io/" target="_blank" rel="noopener">Project website</a>
<a href="https://www.linkedin.com/in/dravinashkumargupta/" target="_blank" rel="noopener">Dr. Avinash — LinkedIn</a>
</div>
</div>
</header>
<div class="banner"><strong>Educational use only.</strong> Not a diagnostic tool. This is a working implementation of <strong><a href="https://classworkdecjan.blogspot.com/2026/07/the-avinash-principle-critical-hub-node.html" target="_blank" rel="noopener">the Avinash Principle</a></strong> — a scale-free heuristic for pruning a case down to the small handful of critical hub nodes that actually decide the trajectory, instead of mapping every possible path. Your API key is stored only in this browser's local storage and sent directly from your browser to your chosen provider — never through any server of ours.</div>
<!-- STEP 1: MODEL -->
<div class="step">
<div class="step-label collapsible" id="label-model"><span class="num">1</span>Model<span class="collapse-arrow" id="arrow-model">▾</span></div>
<div class="card" id="card-model">
<div class="tabrow" id="providerTabs">
<div class="tab active" data-provider="claude">Claude</div>
<div class="tab" data-provider="gemini">Gemini</div>
<div class="tab" data-provider="openai">ChatGPT</div>
<div class="tab" data-provider="other">Other</div>
</div>
<div class="providerpane">
<div class="row" id="endpointRow" style="display:none;">
<div style="grid-column:1/-1;">
<label for="apiEndpoint">API endpoint (OpenAI-compatible chat/completions URL)</label>
<input type="text" id="apiEndpoint" placeholder="https://api.groq.com/openai/v1/chat/completions">
</div>
</div>
<div class="row">
<div>
<label id="apiKeyLabel" for="apiKey">Claude API key</label>
<input type="password" id="apiKey" placeholder="sk-ant-...">
</div>
<div>
<label for="modelName">Model name</label>
<input type="text" id="modelName" placeholder="claude-sonnet-4-6">
</div>
</div>
<div class="key-status empty" id="keyStatus">No key saved for this provider yet.</div>
<details class="settings">
<summary>Where do I get a key?</summary>
<div class="hint" style="margin-top:8px;" id="keyHelp"></div>
</details>
</div>
</div>
</div>
<!-- STEP 2: CASE -->
<div class="step">
<div class="step-label collapsible" id="label-case"><span class="num">2</span>Case<span class="collapse-arrow" id="arrow-case">▾</span></div>
<div class="card" id="card-case">
<label for="caseText">Paste the case — vignette text, discharge summary, your own clerking notes, or a case link</label>
<textarea id="caseText" placeholder="Paste case text directly, e.g. 'A 45 year man presented with pain in right leg and reticular lesion on skin on posterior side of right leg. He met with a road traffic accident 2 years back when he was a professional driver and...'"></textarea>
<div class="sample-case-controls" style="display:flex;flex-wrap:wrap;gap:10px;margin-top:12px;">
<div style="flex:1;min-width:150px;">
<label for="sampleDifficulty" style="margin-bottom:4px;">Sample case difficulty</label>
<select id="sampleDifficulty">
<option value="Any">Any</option>
<option value="Student / early learner — classic, textbook presentation">Student / early learner</option>
<option value="Intern / junior resident — common presentation with a couple of distractors">Intern / junior resident</option>
<option value="Senior resident — moderate complexity, some atypical features">Senior resident</option>
<option value="Attending / expert — atypical, complex, or multi-system presentation">Attending / expert</option>
</select>
</div>
<div style="flex:1;min-width:150px;">
<label for="sampleSpecialty" style="margin-bottom:4px;">Sample case specialty</label>
<select id="sampleSpecialty"></select>
</div>
</div>
<div class="hint">If link can't be fetched automatically — paste the case text itself for best results. <a href="#" id="sampleCaseBtn" style="font-weight:600;color:var(--accent-dark);text-decoration:none;">Try a sample case →</a></div>
<div class="upload-row">
<label for="caseFile">Or upload a case file — PDF, Word (.doc/.docx), or plain text (.txt), max 10MB</label>
<input type="file" id="caseFile" accept=".pdf,.doc,.docx,.txt,application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,text/plain">
<div class="hint" id="uploadStatus"></div>
</div>
</div>
</div>
<!-- STEP 3: ACTIVITY -->
<div class="step">
<div class="step-label" id="label-activity"><span class="num">3</span>Activity</div>
<div id="modeDialogue" class="mode-pane">
<div class="mode-hint">Paste a case, then zoom in and out of the structural gravity of the trajectory — one resolution layer at a time.</div>
<div class="activities" id="activities"></div>
</div>
</div>
<!-- WORKSPACE -->
<div id="workspace">
<div class="ws-header">
<div>
<div class="wtitle" id="wsTitle"></div>
<div class="wsub" id="wsSub"></div>
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<div class="ws-progress-bar"><div class="ws-progress-fill" id="wsProgressFill"></div></div>
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<div class="ws-actions">
<button class="secondary" id="copyTranscriptBtn">Copy transcript</button>
<button class="secondary" id="downloadTranscriptBtn">Download .txt</button>
<button class="secondary" id="resetBtn">Reset run</button>
</div>
</div>
<div class="error-note" id="errorNote"></div>
<div class="transcript" id="transcript"></div>
<div class="composer">
<textarea id="composerInput" placeholder="Your response..."></textarea>
<button id="sendBtn">Send</button>
</div>
</div>
<div class="contribute-card">
<h3>Help improve Hub-Node Navigator</h3>
<p>
Anonymously contribute this session's transcript for educational and research purposes.
No names, emails, or API keys are ever included — only the case type, the back-and-forth, and a timestamp.
</p>
<button class="contribute-btn" id="contributeBtn">Submit</button>
<div class="contribute-status" id="contributeStatus"></div>
</div>
<footer>Critical Hub-Node Navigation · <a href="https://classworkdecjan.blogspot.com/2026/07/the-avinash-principle-critical-hub-node.html" target="_blank" rel="noopener">the Avinash Principle</a> · runs entirely in your browser · bring your own key</footer>
</div>
<script>
/* ---------- config: providers ---------- */
const PROVIDERS = {
claude: {
label: 'Claude',
keyPlaceholder: 'sk-ant-...',
modelPlaceholder: 'claude-sonnet-4-6',
help: 'Create a key at <a href="https://console.anthropic.com/settings/keys" target="_blank">console.anthropic.com</a>. Paste the model name exactly as shown there — model names change over time, so if a call fails, double check the current model string.'
},
gemini: {
label: 'Gemini',
keyPlaceholder: 'AIza...',
modelPlaceholder: 'gemini-2.5-flash',
help: 'Create a key at <a href="https://aistudio.google.com/app/apikey" target="_blank">aistudio.google.com/app/apikey</a>. Check the current model name in Google AI Studio if a call fails.'
},
openai: {
label: 'ChatGPT',
keyPlaceholder: 'sk-...',
modelPlaceholder: 'gpt-4o-mini',
help: 'Create a key at <a href="https://platform.openai.com/api-keys" target="_blank">platform.openai.com/api-keys</a>. Check the current model name in the OpenAI docs if a call fails.'
},
other: {
label: 'Other',
keyPlaceholder: 'API key (leave blank if none)',
modelPlaceholder: 'model-name-as-required-by-provider',
needsEndpoint: true,
help: 'Works with any provider that exposes an OpenAI-compatible <code>/chat/completions</code> endpoint — this covers most of the LLM ecosystem beyond the big three: Groq, Together AI, Mistral, DeepSeek, xAI (Grok), Perplexity, OpenRouter (which itself proxies dozens more models), Fireworks, local servers like Ollama or LM Studio, and more. Paste the full endpoint URL, the key that provider gave you, and the exact model name it expects. If a call fails, check that provider\'s docs — the request/response shape is standardized, but model names and auth details vary.'
}
};
/* ---------- config: activities ---------- */
const ACTIVITIES = {
avinash: {
name: 'Hub-Node Navigator',
desc: 'Prune the case to the small handful of critical hub nodes that decide the trajectory. Zoom out for system gravity, zoom in for bifurcation tactics.',
subtitle: 'Preliminary scan first, then you choose the zoom.',
systemPrompt: (c) => `System Prompt: The Avinash Navigator
Role: You are an expert clinical strategist operating under the "Avinash Principle." Your goal is to navigate a patient's trajectory by identifying the top critical hub nodes that dictate systemic gravity — not by mapping exhaustive decision trees. You process information in controlled "zoom" layers, one level at a time, and you treat every high-leverage node as a bifurcation point with both an intended effect and a possible dark side.
CORE FRAMEWORK (apply to every case):
1. Phase Boundary Identification
- Identify immediate, non-linear time windows (golden hour, reperfusion window, septic escalation threshold, etc.)
- Phase Criticality: [High / Medium / Low]
2. High-Leverage Node Mapping (top hub nodes of the case)
- Explainable Hubs: physiological/biochemical intersections
- Experiencable Hubs: narrative, biographical, behavioral realities uncovered through slow-medicine history-taking
- Comorbidity Weighting: note which nodes gain outsized criticality because of overlapping conditions (multiplicative, not additive)
3. Bifurcation & Risk Matrix (mandatory for every node)
- Effect: [High / Medium / Low]
- Uncertainty: [High / Medium / Low]
- Red Flag: the specific catastrophic or unexpected failure mode
- Safety Preparation: the circuit breaker that must be ready before acting
4. Macro Trajectory Alignment
- Status Quo Trajectory: outcome if the hub nodes are left unaddressed
- Aligned Trajectory: outcome once the hub nodes are secured
- Minimal High-Yield Interventions: 1-3 actions, targeted only at the critical hubs
ZOOM COMMANDS (never map more than one layer without being asked):
- [ZOOM OUT: SYSTEM GRAVITY] -> map the structural life/clinical domains shaping the patient's overall attractor state. Ignore routine detail.
- [ZOOM IN: BIFURCATION TACTICS] -> drop the system map; drill into the failure mode and circuit breaker of one specific node.
- [LOCK: CRITICAL NODES] -> hold current resolution; refine node weighting only.
DEPTH CONTROL:
If no zoom command is given, perform only a Preliminary Scan (top hub nodes, phase boundary, one-line trajectory) and then ask the user which direction to zoom next. Never deliver more than one resolution layer unprompted.
TRAINING PROTOCOL (Grandmaster's Apprentice Mode — activate on request):
- Present the case without revealing the analysis.
- Ask the user to name the top hub nodes first.
- Compare their answer to the structural analysis; if they miss a node, ask them to reason it out before revealing why it matters.
- Goal: calibrate the user's own node-spotting instinct over repeated cases, not to replace their judgment.
CONSTRAINTS:
- Prune managerial/routine nodes aggressively unless they directly threaten a critical node.
- Use qualitative (High/Medium/Low) weighting anchored to clinical gravity, never raw statistics presented without context.
- Present node matrices in scannable tables.
- Never claim this replaces clinical judgment, guidelines, or expertise — frame all output as a cognitive aid, not a verdict.
Here is the case:
${c}
Begin now: perform the Preliminary Scan only (top hub nodes, phase boundary, one-line trajectory), then ask me which direction I'd like to zoom next — [ZOOM OUT: SYSTEM GRAVITY], [ZOOM IN: BIFURCATION TACTICS], or [LOCK: CRITICAL NODES].`
}
};
/* ---------- state ---------- */
let state = {
provider: 'claude',
activity: null,
mode: 'dialogue',
messages: [], // {role:'user'|'assistant', content:string, auto?:boolean}
running: false,
runKind: null // 'dialogue'
};
const $ = (id) => document.getElementById(id);
/* ---------- localStorage helpers ---------- */
function loadKeys(){
try{ return JSON.parse(localStorage.getItem('hubnav_keys')||'{}'); }catch(e){ return {}; }
}
function saveKeys(k){ localStorage.setItem('hubnav_keys', JSON.stringify(k)); }
function loadModels(){
try{ return JSON.parse(localStorage.getItem('hubnav_models')||'{}'); }catch(e){ return {}; }
}
function saveModels(m){ localStorage.setItem('hubnav_models', JSON.stringify(m)); }
function loadEndpoints(){
try{ return JSON.parse(localStorage.getItem('hubnav_endpoints')||'{}'); }catch(e){ return {}; }
}
function saveEndpoints(e){ localStorage.setItem('hubnav_endpoints', JSON.stringify(e)); }
function loadCaseText(){
try{ return localStorage.getItem('hubnav_case') || ''; }catch(e){ return ''; }
}
function saveCaseText(t){ try{ localStorage.setItem('hubnav_case', t); }catch(e){} }
const SPECIALTIES = [
'Any',
'Allergy and Immunology',
'Anesthesiology',
'Cardiology',
'Cardiothoracic Surgery',
'Colon and Rectal Surgery',
'Critical Care / Intensive Care Medicine',
'Dermatology',
'Emergency Medicine',
'Endocrinology',
'Family Medicine',
'Gastroenterology',
'General Surgery',
'Geriatrics',
'Gynecologic Oncology',
'Hematology',
'Hematology-Oncology',
'Hepatology',
'Hospice and Palliative Medicine',
'Infectious Disease',
'Internal Medicine',
'Interventional Radiology',
'Medical Genetics',
'Nephrology',
'Neonatology',
'Neurology',
'Neurosurgery',
'Obstetrics and Gynecology',
'Occupational Medicine',
'Oncology',
'Ophthalmology',
'Orthopedic Surgery',
'Otolaryngology (ENT)',
'Pain Medicine',
'Pathology',
'Pediatrics',
'Pediatric Cardiology',
'Pediatric Emergency Medicine',
'Pediatric Surgery',
'Physical Medicine and Rehabilitation',
'Plastic Surgery',
'Podiatry',
'Preventive Medicine',
'Psychiatry',
'Pulmonology',
'Radiation Oncology',
'Radiology',
'Rheumatology',
'Sleep Medicine',
'Sports Medicine',
'Toxicology',
'Transplant Medicine',
'Trauma Surgery',
'Urology',
'Vascular Surgery'
];
(function populateSpecialties(){
const sel = $('sampleSpecialty');
if(!sel) return;
SPECIALTIES.forEach(spec=>{
const opt = document.createElement('option');
opt.value = spec;
opt.textContent = spec;
sel.appendChild(opt);
});
})();
function buildSampleCasePrompt(difficulty, specialty){
let ask = 'Generate one realistic, self-contained clinical vignette for a medical learner to practice diagnostic reasoning on. ';
if(specialty && specialty !== 'Any'){
ask += `The case must fall within the specialty of ${specialty}. `;
}
if(difficulty && difficulty !== 'Any'){
ask += `Pitch the case difficulty at the level of: ${difficulty}. `;
} else {
ask += 'Cover a single adult or pediatric patient presenting with a common or classic presentation (your choice — vary it each time). ';
}
ask += 'Include age, sex, presenting complaint, relevant history, and pertinent exam/vital sign findings, and a couple of relevant labs or initial test results if appropriate. Do not reveal or hint at the diagnosis name, and do not include headers, labels, or any framing text — output ONLY the vignette itself as a single flowing paragraph of 4-7 sentences, written the way a case would appear in a textbook.';
return ask;
}
$('sampleCaseBtn') && $('sampleCaseBtn').addEventListener('click', async (e)=>{
e.preventDefault();
const btn = $('sampleCaseBtn');
const keys = loadKeys();
const models = loadModels();
const apiKey = keys[state.provider];
const model = models[state.provider] || PROVIDERS[state.provider].modelPlaceholder;
if(!apiKey && !PROVIDERS[state.provider].needsEndpoint){
alert('Add an API key for ' + PROVIDERS[state.provider].label + ' in Step 1 first, then try again.');
return;
}
const difficulty = $('sampleDifficulty') ? $('sampleDifficulty').value : 'Any';
const specialty = $('sampleSpecialty') ? $('sampleSpecialty').value : 'Any';
const prompt = buildSampleCasePrompt(difficulty, specialty);
const original = btn.textContent;
btn.textContent = 'Generating…';
btn.style.pointerEvents = 'none';
try{
let sample;
const msgs = [{role:'user', content:'Begin.'}];
if(state.provider === 'claude'){
sample = await callClaude(apiKey, model, prompt, msgs);
} else if(state.provider === 'gemini'){
sample = await callGemini(apiKey, model, prompt, msgs);
} else if(state.provider === 'other'){
const endpoints = loadEndpoints();
sample = await callCustom(endpoints['other'], apiKey, model, prompt, msgs);
} else {
sample = await callOpenAI(apiKey, model, prompt, msgs);
}
sample = (sample || '').trim();
if(!sample) throw new Error('Empty response.');
$('caseText').value = sample;
saveCaseText(sample);
trackEvent('sample_case_generated', {provider: state.provider, difficulty: difficulty, specialty: specialty});
} catch(err){
alert('Could not generate a sample case: ' + err.message);
} finally {
btn.textContent = original;
btn.style.pointerEvents = '';
}
});
function loadCollapseState(){
try{ return JSON.parse(localStorage.getItem('hubnav_collapse')||'{}'); }catch(e){ return {}; }
}
function saveCollapseState(c){ localStorage.setItem('hubnav_collapse', JSON.stringify(c)); }
/* ---------- theme selector (Simple / Book / Minimalist / Terminal) ---------- */
const VALID_THEMES = ['simple', 'minimalist', 'terminal'];
function applyTheme(theme){
if(!VALID_THEMES.includes(theme)) theme = 'simple';
document.documentElement.setAttribute('data-theme', theme);
if($('themeSelect')) $('themeSelect').value = theme;
}
function initTheme(){
let saved = null;
try{ saved = localStorage.getItem('hubnav_theme'); }catch(e){}
applyTheme(saved || 'simple');
}
initTheme();
$('themeSelect') && $('themeSelect').addEventListener('change', (e)=>{
const next = e.target.value;
applyTheme(next);
try{ localStorage.setItem('hubnav_theme', next); }catch(e){}
trackEvent('change_theme', {theme: next});
});
/* ---------- render: provider tabs ---------- */
function renderProviderPane(){
const p = PROVIDERS[state.provider];
$('apiKeyLabel').textContent = p.label + ' API key';
$('apiKey').placeholder = p.keyPlaceholder;
$('modelName').placeholder = p.modelPlaceholder;
$('keyHelp').innerHTML = p.help;
const keys = loadKeys();
const models = loadModels();
$('apiKey').value = keys[state.provider] || '';
$('modelName').value = models[state.provider] || '';
$('endpointRow').style.display = p.needsEndpoint ? '' : 'none';
if(p.needsEndpoint){
const endpoints = loadEndpoints();
$('apiEndpoint').value = endpoints[state.provider] || '';
}
updateKeyStatus();
}
function updateKeyStatus(){
const keys = loadKeys();
const el = $('keyStatus');
if(keys[state.provider]){
el.textContent = 'Key saved locally for ' + PROVIDERS[state.provider].label + '.';
el.className = 'key-status ok';
} else {
el.textContent = 'No key saved for this provider yet.';
el.className = 'key-status empty';
}
}
document.querySelectorAll('#providerTabs .tab').forEach(tab=>{
tab.addEventListener('click', ()=>{
const targetProvider = tab.dataset.provider;
if(state.messages.length > 0 && targetProvider !== state.provider){
const ok = confirm(
'You have an active conversation with ' + PROVIDERS[state.provider].label + '. ' +
'Switching models mid-run can produce inconsistent results since context formatting ' +
'differs between providers. Switch to ' + PROVIDERS[targetProvider].label + ' anyway?'
);
if(!ok) return;
}
document.querySelectorAll('#providerTabs .tab').forEach(t=>t.classList.remove('active'));
tab.classList.add('active');
state.provider = targetProvider;
renderProviderPane();
});
});
$('apiKey').addEventListener('input', ()=>{
const keys = loadKeys();
const hadKeyBefore = !!keys[state.provider];
keys[state.provider] = $('apiKey').value.trim();
saveKeys(keys);
updateKeyStatus();
// Auto-collapse Model once a key is first saved, unless the user has already
// made an explicit choice about this section's collapsed state.
const saved = loadCollapseState();
if(!hadKeyBefore && keys[state.provider] && !saved.hasOwnProperty('model')){
applyCollapsed('model', true);
}
});
$('modelName').addEventListener('input', ()=>{
const models = loadModels();
models[state.provider] = $('modelName').value.trim();
saveModels(models);
});
$('apiEndpoint').addEventListener('input', ()=>{
const endpoints = loadEndpoints();
endpoints[state.provider] = $('apiEndpoint').value.trim();
saveEndpoints(endpoints);
});
/* ---------- shared preflight check ---------- */
function preflightOk(){
const caseText = $('caseText').value.trim();
if(!caseText){
applyCollapsed('case', false);
alert('Paste a case first — Step 2.');
return false;
}
const keys = loadKeys();
if(!keys[state.provider] && !PROVIDERS[state.provider].needsEndpoint){
applyCollapsed('model', false);
alert('Add an API key for ' + PROVIDERS[state.provider].label + ' in Step 1 first.');
return false;
}
if(PROVIDERS[state.provider].needsEndpoint){
const endpoints = loadEndpoints();
if(!endpoints[state.provider]){
applyCollapsed('model', false);
alert('Add an API endpoint URL in Step 1 first.');
return false;
}
}
return true;
}
/* ---------- render: dialogue activities ---------- */
function renderActivities(){
const wrap = $('activities');
wrap.innerHTML = '';
Object.entries(ACTIVITIES).forEach(([key, a])=>{
const div = document.createElement('div');
div.className = 'activity' + (state.activity===key ? ' selected':'');
div.innerHTML = `<div class="aname">${a.name}</div><div class="adesc">${a.desc}</div>`;
div.addEventListener('click', ()=>{
state.activity = key;
renderActivities();
startDialogueRun();
});
wrap.appendChild(div);
});
}
renderActivities();
renderProviderPane();
/* ---------- case text persistence ---------- */
$('caseText').value = loadCaseText();
$('caseText').addEventListener('input', ()=>{
saveCaseText($('caseText').value);
});
/* ---------- case file upload (PDF / Word / text) ---------- */