LibreChat + Fable 5: Show It a Screenshot or a PDF

The Stack

Tested Against

Prerequisites

• Docker (LibreChat runs via docker compose)
• An Anthropic API key (Claude API) for claude-fable-5

Steps

1. 1

   Self-host LibreChat and point it at Fable

   git clone the repo, cp .env.example .env and paste your ANTHROPIC_API_KEY, then docker compose up -d. Because Fable is new you add claude-fable-5 to the Anthropic model list yourself (ANTHROPIC_MODELS in .env). Then open it, pick Claude, choose claude-fable-5, and drag in a screenshot.

2. 2

   What CI checks: the config is valid and names Fable

   CI confirms the .env carries an ANTHROPIC_API_KEY line and the Anthropic model list names claude-fable-5. That's the deterministic precondition for the right model being used, no key needed. Fable reading the image is fenced.

   cat > .env <<'EOF'
   ANTHROPIC_API_KEY=sk-ant-REPLACE_ME
   ANTHROPIC_MODELS=claude-fable-5
   EOF
   cat > checklibrechat.mjs <<'EOF'
   import { readFileSync } from 'node:fs';
   const env = readFileSync('.env', 'utf8');
   let ok = true;
   function check(label, cond){ console.log(label + ': ' + (cond ? 'yes' : 'NO')); if(!cond) ok=false; }
   check('ANTHROPIC_API_KEY line present', env.includes('ANTHROPIC_API_KEY='));
   check('Anthropic model list present', env.includes('ANTHROPIC_MODELS='));
   check('model list names claude-fable-5', env.includes('claude-fable-5'));
   if(!ok){ console.log('librechat config check FAILED'); process.exit(1); }
   console.log('librechat config check OK: names claude-fable-5');
   EOF
   node checklibrechat.mjs

3. 3

   Drop in an image and ask (the model step, not checked by CI)

   Upload a screenshot or PDF and ask Fable about it. That call runs the model and is non-deterministic, so CI never claims it. The badge covers the config, not the reading.