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TL;DR
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Data flow
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Tool / channel inventory
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Why picture rendering didn't work
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Fix: S3 as a data-exchange hub
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Build order (parallel-able after the first two)
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Criticality matrix
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<h1 id="data-leak-audit-2026-05-21-analyzing-lumen-tr004-test-data">Data-leak audit — 2026-05-21 · <code>Analyzing LUMEN TR004 Test Data</code><a class="headerlink" href="#data-leak-audit-2026-05-21-analyzing-lumen-tr004-test-data" title="Permanent link">&para;</a></h1>
<p><strong>Conversation</strong>: <code>ec5fba44-Analyzing_LUMEN_TR004_Test_Data.json</code>
<strong>LobeHub session model</strong>: <code>qwen3-coder-30b-a3b-instruct</code> (19 turns) + <code>llama-3.3-70b-instruct</code> (2 turns)
<strong>Total messages</strong>: 41 (3 user · 21 assistant · 17 tool)
<strong>Auditor</strong>: agent doctrine-driven scan, 2026-05-21</p>
<h2 id="tldr">TL;DR<a class="headerlink" href="#tldr" title="Permanent link">&para;</a></h2>
<p><strong>Verdict: NO unapproved data egress. All conversation data stayed within the homelab + approved-partner perimeter.</strong></p>
<ul>
<li><strong>Zero</strong> <code>lobe-cloud-sandbox</code> calls — the breach channel from the prior day is absent. Model used LobeHub's <strong>builtin <code>Artifacts</code></strong> tool instead (SVG + interactive HTML generators) — those run in-process.</li>
<li>LLM inference went to <strong>SAIA / GWDG</strong> via LiteLLM (21 turns) — <strong>approved partner</strong>, <a href="https://docs.hpc.gwdg.de/services/ai-services/saia/index.html">DLR-vetted</a>, integrated with the DLR IdP federation. Not a leak in this context.</li>
</ul>
<p>Two off-host channels (both approved or low-risk):</p>
<ol>
<li><strong>SAIA (GWDG academic)</strong> — 21 assistant turns sent prompt + Shepard data + tool messages. ✅ approved partner.</li>
<li><strong><code>cdn.jsdelivr.net</code></strong> — Chart.js library reference in one generated HTML artifact. The HTML never rendered (see "Why pictures didn't render"), so the fetch never happened. If/when it does, it's a public-CDN library fetch, no payload data. Low risk; informational.</li>
</ol>
<p>Shepard MCP fetches and the Artifacts tool stayed on-LAN.</p>
<h2 id="data-flow">Data flow<a class="headerlink" href="#data-flow" title="Permanent link">&para;</a></h2>
<pre class="mermaid"><code>flowchart LR
user(["You · browser"]) --&gt;|HTTPS via Zoraxy| lobe["LobeHub · CT 104"]
lobe --&gt;|MCP, internal| shep[Shepard API · CT 101]
shep --&gt;|test data, lab notes| lobe
lobe --&gt;|prompt + Shepard results +&lt;br/&gt;tool messages| litellm[LiteLLM proxy · CT 104]
litellm -.-&gt;|qwen3-coder-30b-a3b-instruct&lt;br/&gt;llama-3.3-70b-instruct&lt;br/&gt;19+2 calls| saia[(SAIA / GWDG&lt;br/&gt;academic provider)]
litellm -. fallback only .- cerebras[(Cerebras)]
litellm -. fallback only .- gemini[(Gemini)]
litellm -. fallback only .- mistral[(Mistral)]
lobe --&gt;|builtin Artifacts&lt;br/&gt;generateSVG + generateInteractiveHTML| af[Artifacts plugin&lt;br/&gt;in-container]
af -.failed render.-&gt; user
af -. would have fetched if rendered .-&gt; cdn[(cdn.jsdelivr.net)]
classDef leak fill:#5a2a2a,stroke:#c44,color:#fcc
classDef ok fill:#234c2a,stroke:#4c8,color:#cfc
classDef stale stroke-dasharray:4 4,color:#888
class saia leak
class shep,lobe,litellm,user,af ok
class cerebras,gemini,mistral,cdn stale</code></pre>
<h2 id="tool-channel-inventory">Tool / channel inventory<a class="headerlink" href="#tool-channel-inventory" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>Channel</th>
<th>Calls</th>
<th>Destination</th>
<th>Trust</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>shepard</code> MCP</td>
<td>9</td>
<td><code>shepard-api.nuclide.systems</code> (CT 101)</td>
<td>✅ LAN</td>
</tr>
<tr>
<td><code>Artifacts</code> builtin (<code>generateSVG</code> + <code>generateInteractiveHTML</code>)</td>
<td>5</td>
<td>In-container (broken — empty result)</td>
<td>✅ LAN</td>
</tr>
<tr>
<td><code>lobe-agent-documents</code> (<code>createDocument</code>, <code>readDocument</code>, <code>replaceDocumentContent</code>)</td>
<td>3</td>
<td>In-container</td>
<td>✅ LAN</td>
</tr>
<tr>
<td>LLM inference (<code>qwen3-coder-30b-a3b-instruct</code> + <code>llama-3.3-70b-instruct</code>)</td>
<td>21</td>
<td><strong>SAIA (GWDG)</strong> via LiteLLM</td>
<td>✅ approved partner (DLR-vetted, IdP-federated)</td>
</tr>
</tbody>
</table>
<h2 id="why-picture-rendering-didnt-work">Why picture rendering didn't work<a class="headerlink" href="#why-picture-rendering-didnt-work" title="Permanent link">&para;</a></h2>
<p>Three layered failures.</p>
<pre class="mermaid"><code>sequenceDiagram
participant M as Model (qwen3-coder)
participant T as Artifacts tool
participant U as LobeHub UI
participant B as Your browser
M-&gt;&gt;T: generateSVG(content="&lt;svg&gt;…&lt;/svg&gt;")
T--&gt;&gt;M: "" (empty response)
Note over M,T: Tool result is length 0 — the SVG was&lt;br/&gt;accepted but no URL / handle came back.
M-&gt;&gt;U: markdown with relative path:&lt;br/&gt;![Timeline](timeline_view.svg)
U-&gt;&gt;B: render markdown as-is
B-&gt;&gt;U: GET /timeline_view.svg
U--&gt;&gt;B: 200 SPA index.html (catch-all route)
Note over B: "links take me to chat.nuclide.systems/"</code></pre>
<ol>
<li><strong><code>Artifacts</code> tool returns empty.</strong> Every <code>generateSVG</code> / <code>generateInteractiveHTML</code> result had <code>content</code> length 0. The plugin is supposed to register the SVG/HTML as a side-panel "artifact" that the UI surfaces inline, but it returns nothing useful to the model — so the model has no handle/URL to reference.</li>
<li><strong>Model invents relative paths.</strong> Without a real URL, the model writes markdown like <code>![Timeline](timeline_view.svg)</code> — relative paths against the SPA route, which returns <code>index.html</code> for any unknown path. That's why every "link takes you to <code>chat.nuclide.systems/</code>".</li>
<li><strong>No content store on the homelab.</strong> Even if the model asked "save this SVG to a URL", there's no integrated artifact storage today.</li>
</ol>
<p>LobeHub's <code>Artifacts</code> works in Anthropic's hosted claude.ai because of client-side inline rendering. The self-hosted version's behavior here is broken / incomplete — either a config gap or the build is newer than the artifact-render code.</p>
<h2 id="fix-s3-as-a-data-exchange-hub">Fix: S3 as a data-exchange hub<a class="headerlink" href="#fix-s3-as-a-data-exchange-hub" title="Permanent link">&para;</a></h2>
<p>You already have <strong>Garage S3</strong> on CT 104 (<code>/opt/stacks/shared-db/garage/</code>, moved to local NVMe 2026-05-19). Repurpose it as the artifact store for every AI surface.</p>
<pre class="mermaid"><code>flowchart LR
subgraph LH[CT 104 LobeHub]
model[Model + Artifacts tool]
interceptor["upload sidecar / fork:&lt;br/&gt;capture generateSVG / HTML output"]
end
subgraph S3[CT 104 Garage S3]
bucket[(chat-artifacts bucket&lt;br/&gt;public-read on /pub/* prefix)]
end
cs[("Coder workspaces&lt;br/&gt;CT 111&lt;br/&gt;S3 SDK"
)]
user(["Browser"])
zx[Zoraxy&lt;br/&gt;s3.nuclide.systems]
model --&gt;|content| interceptor
interceptor --&gt;|PUT /chat-artifacts/&lt;chatId&gt;/&lt;n&gt;.svg| bucket
interceptor --&gt;|public URL| model
model --&gt;|markdown with absolute URL| user
user --&gt;|GET| zx --&gt;|TLS+ACME| bucket
cs &lt;--&gt;|S3 SDK| bucket</code></pre>
<h3 id="build-order-parallel-able-after-the-first-two">Build order (parallel-able after the first two)<a class="headerlink" href="#build-order-parallel-able-after-the-first-two" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>[no prereqs]
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>└── B. Fix s3.nuclide.systems Zoraxy route + Garage external endpoint (~30 min)
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> └── C. chat-artifacts bucket + ACL + lifecycle (~20 min)
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> ├── D. upload_artifact MCP server (CT 104 gateway, ~1 h)
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> ├── E. LobeHub Artifacts patch → S3 upload (TypeScript, ~3-4 h)
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> └── F. Coder savefig helper into dotfiles (~30 min)
</code></pre></div>
<p>D, E, F can run concurrently once C is up. Total elapsed if D+F land in parallel and E is deferred: ~2 hours wall time.</p>
<h2 id="criticality-matrix">Criticality matrix<a class="headerlink" href="#criticality-matrix" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>Channel</th>
<th>Sensitivity</th>
<th>Likelihood</th>
<th>Trust</th>
<th>Verdict</th>
</tr>
</thead>
<tbody>
<tr>
<td>SAIA inference (via LiteLLM)</td>
<td>High</td>
<td>100%</td>
<td>✅ approved partner</td>
<td><strong>OK</strong></td>
</tr>
<tr>
<td><code>cdn.jsdelivr.net</code> (CDN libs)</td>
<td>Low</td>
<td>~Low (only when artifact renders)</td>
<td>external CDN, no payload data</td>
<td>LOW</td>
</tr>
<tr>
<td>Shepard MCP fetches</td>
<td>Internal</td>
<td>Every related chat</td>
<td>✅ LAN</td>
<td>LOW</td>
</tr>
<tr>
<td><code>Artifacts</code> plugin</td>
<td>In-container</td>
<td>100% in this chat</td>
<td>✅ LAN (just broken)</td>
<td>n/a</td>
</tr>
</tbody>
</table>
<h2 id="recommended-actions-ordered-with-parallelism">Recommended actions (ordered, with parallelism)<a class="headerlink" href="#recommended-actions-ordered-with-parallelism" title="Permanent link">&para;</a></h2>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>[no prereqs — start any]
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>├── A. Pin sensitive chats to a local LLM (LobeHub + LiteLLM)
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>├── B. Fix s3.nuclide.systems Zoraxy route (Zoraxy — needs operator OK)
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>│ └── C. chat-artifacts bucket + ACL + lifecycle (Garage)
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>│ ├── D. upload_artifact MCP server (CT 104 gateway)
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>│ ├── E. Fix LobeHub Artifacts to push S3 (TypeScript patch)
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>│ └── F. Coder savefig helper (dotfiles)
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>├── G. Clean stale DAYTONA_API_KEY from LobeHub (CT 104 env)
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>└── H. Egress firewall block (Cerebras / lobehub / codesandbox) (UniFi UDM)
</code></pre></div>
<p>See also: <a href="../data-leak-audit-2026-05-20-tr004-cloud-sandbox/"><code>data-leak-audit-2026-05-20-tr004-cloud-sandbox.md</code></a> for the prior session, and <a href="../data-leak-audit-comparison/"><code>data-leak-audit-comparison.md</code></a> for the side-by-side.</p>
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