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1. Goal / Intent
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2. Architecture (three competing models in-repo; A chosen, B orphaned, C aspirational)
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3. MCP Server Inventory (reconciled — server.py MCP_SERVERS is authoritative)
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4. Implemented vs Unfinished vs Broken
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5. Relevant .env keys (names only)
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6. Open Design Decisions (must resolve)
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7. Recommended Path (ordered, lowest-risk first)
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<blockquote>
<p><strong>STATUS: SUPERSEDED 2026-05-17 — current implementation lives in services/mcp-gateway.md. Kept for design-rationale history.</strong></p>
</blockquote>
<hr />
<h1 id="mcp-gateway-reconstructed-design-spec-in-progress-phase-1">MCP Gateway — Reconstructed Design Spec (in-progress, "Phase 1")<a class="headerlink" href="#mcp-gateway-reconstructed-design-spec-in-progress-phase-1" title="Permanent link">&para;</a></h1>
<blockquote>
<p>Reconstructed 2026-05-16 from code/configs/git history. The gateway is a
single-squash-commit first draft (<code>0cad389 "Phase 1: Create MCP Gateway with
Docker-in-Docker support"</code>, preceded by <code>726bd10 "WIP: MCP gateway prep"</code>).
Nothing has a second iteration in git — everything below is first-draft intent.</p>
</blockquote>
<h2 id="1-goal-intent">1. Goal / Intent<a class="headerlink" href="#1-goal-intent" title="Permanent link">&para;</a></h2>
<p>A single <strong>OAuth-protected HTTP entrypoint at <code>https://mcp.nuclide.systems</code></strong> that
exposes a curated set of MCP servers to AI clients on the homelab. Primary
consumer: <strong>Claude.ai</strong> as a remote connector (SSE at <code>/</code>, every README's
"Usage in Claude.ai"). Secondary: <strong>LobeChat</strong> (<code>chat.nuclide.systems</code>) and
<strong>LiteLLM</strong> (<code>ai.nuclide.systems</code>), sharing the same Pocket ID OAuth app. It is
meant to replace the "cumbersome" static-compose approach (<code>mcp-tools.yaml</code>)
with a dynamic, UI-managed, self-hosting model — answering the open <code>todo.md</code>
question "MCP deployment seems cumbersome — can litellm host directly? how to
integrate npx, uvx, docker-based containers?". Unifying idea: normalize
npx / uvx / docker MCP servers behind one Dockerized gateway.</p>
<h2 id="2-architecture-three-competing-models-in-repo-a-chosen-b-orphaned-c-aspirational">2. Architecture (three competing models in-repo; A chosen, B orphaned, C aspirational)<a class="headerlink" href="#2-architecture-three-competing-models-in-repo-a-chosen-b-orphaned-c-aspirational" title="Permanent link">&para;</a></h2>
<p><strong>A. FastAPI gateway + Docker-in-Docker (chosen)</strong> — <code>ai/mcp-gateway/</code>
- FastAPI + <code>uvicorn</code> on <code>0.0.0.0:8080</code>, container <code>mcp-gateway</code>.
- DinD via bind-mounted <code>/var/run/docker.sock</code>; <code>docker.from_env()</code>.
- Per-server containers spawned <code>mcp-&lt;name&gt;</code>, hardcoded onto <code>ai-internal</code>.
- Config <code>config.json</code> (RW bind, currently EMPTY → falls back to <code>DEFAULT_SERVERS</code>).
- Gateway joins <code>ai-internal</code> + <code>shared_backend</code> (both <code>external: true</code>).</p>
<p><strong>B. Static compose <code>mcp-tools.yaml</code></strong> — orphaned; <code>ai/docker-compose.yml:6</code>
include is <strong>commented out</strong>. Internally malformed (see §4).</p>
<p><strong>C. LiteLLM-hosted</strong> — <code>litellm-config/config.yaml</code> <code>mcp_servers: {}</code> empty.
Confirms MCP hosting was intended for the gateway, not LiteLLM (the
<code>todo.md</code> "can litellm host directly?" question remains open).</p>
<p><strong>Transports</strong> (normalized to HTTP-on-:8000): streamable-http (nextcloud,
mermaid), <code>mcp-proxy --stateless</code> stdio→HTTP (papersearch), native HTTP
(markitdown, crawl4ai :11235), and the gateway's own <strong>SSE <code>/</code> endpoint —
a STUB</strong> (fake <code>initialize</code> + 60s pings, no routing to backends).</p>
<p><strong>Reverse proxy:</strong> Zoraxy <code>mcp.nuclide.systems → 192.168.1.40:8080</code>.
<code>mcp-auth.nuclide.systems</code> is an abandoned auth-sidecar idea (not exposed).</p>
<p><strong>OAuth (Pocket ID @ <code>id.nuclide.systems</code>):</strong> <code>OAuth2AuthorizationCodeBearer</code>,
scopes <code>{openid, mcp}</code>, token validation via userinfo. Shared gateway client
(<code>GENERIC_CLIENT_ID</code>, same as LiteLLM/LobeChat). Per-server OAuth for
papersearch &amp; nextcloud against the same Pocket ID.</p>
<h2 id="3-mcp-server-inventory-reconciled-serverpy-mcp_servers-is-authoritative">3. MCP Server Inventory (reconciled — <code>server.py</code> MCP_SERVERS is authoritative)<a class="headerlink" href="#3-mcp-server-inventory-reconciled-serverpy-mcp_servers-is-authoritative" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>Server</th>
<th>Image / build</th>
<th>Transport</th>
<th>Port</th>
<th>Auth</th>
<th>Status</th>
</tr>
</thead>
<tbody>
<tr>
<td>papersearch</td>
<td><code>python:3.12-slim</code> + runtime <code>uv tool install mcp-proxy</code> → <code>paper_search_mcp.server</code></td>
<td>mcp-proxy stdio→http</td>
<td>8000</td>
<td>Pocket ID <code>PAPERSEARCH_MCP_OAUTH_*</code></td>
<td>plausible, runtime-install fragile</td>
</tr>
<tr>
<td>nextcloud</td>
<td><code>ghcr.io/cbcoutinho/nextcloud-mcp-server:latest</code></td>
<td>streamable-http</td>
<td>8000</td>
<td>Pocket ID <code>NEXTCLOUD_MCP_OAUTH_*</code></td>
<td>likely workable (real image)</td>
</tr>
<tr>
<td>markitdown</td>
<td><code>python:3.12-slim</code> + <code>uvx markitdown-mcp --http</code></td>
<td>http</td>
<td>8000</td>
<td>none</td>
<td><strong>broken as written</strong> (<code>uvx</code> not in base image)</td>
</tr>
<tr>
<td>comfyui</td>
<td><code>ghcr.io/richardi-ai/comfyui-mcp-server:latest</code> (<code>type:"npm"</code> mismatch)</td>
<td>unspecified</td>
<td>8000</td>
<td>none</td>
<td><strong>image not pullable</strong>; backend ComfyUI was crash-looping</td>
</tr>
<tr>
<td>crawl4ai</td>
<td><code>unclecode/crawl4ai:latest</code></td>
<td>http</td>
<td>11235</td>
<td>none</td>
<td>likely workable; resource limits lost in rewrite</td>
</tr>
<tr>
<td>mermaid</td>
<td><code>node:20-slim</code> + runtime <code>npx -y mcp-mermaid</code></td>
<td>streamable-http</td>
<td>8000</td>
<td>none</td>
<td>plausible, slow first start</td>
</tr>
</tbody>
</table>
<h2 id="4-implemented-vs-unfinished-vs-broken">4. Implemented vs Unfinished vs Broken<a class="headerlink" href="#4-implemented-vs-unfinished-vs-broken" title="Permanent link">&para;</a></h2>
<p><strong>Implemented:</strong> FastAPI app + OAuth scheme + userinfo token validation;
container lifecycle CRUD + persistence; Web UI SPA (<code>templates/ui.html</code> @ <code>/ui</code>);
gateway compose/Dockerfile + Zoraxy route.</p>
<p><strong>Unfinished / stub:</strong>
- <strong>SSE <code>/</code> is fake</strong> — no MCP transport bridging Claude.ai → spawned servers. <em>Core gap.</em>
- <strong>No routing to per-server containers</strong>; all five servers bind the same <code>:8000</code>
and <code>spawn_container</code> host-publishes <code>8000:8000</code> → <strong>two servers can't run at once</strong>.
- <strong>OAuth callback non-functional</strong> — token-exchange URL built via
<code>OAUTH_REDIRECT_URI.replace("/sso/callback","/token")</code> (→ wrong host, not the
Pocket ID token endpoint); token never stored/used.
- <code>config.json</code> empty → always defaults; secrets hardcoded plaintext in <code>server.py</code>.</p>
<p><strong>Broken / contradictory:</strong>
- <code>ai/docker-compose.yml:6</code> mcp-tools include commented out; gateway compose is a
<em>separate project</em> not referenced by the stack either — wired in only via Zoraxy.
- <code>mcp-tools.yaml</code>: duplicate <code>markitdown-mcp</code> key; <code>comfyui-mcp</code> env missing <code>=</code>
(<code>- COMFYUI_URL http://comfyui:8188</code>); missing images/ports.
- <code>comfyui</code> server <code>type:"npm"</code> vs Docker-image mismatch; upstream image/npm
package existence unverified (image confirmed <strong>not pullable</strong>).
- <code>.env</code> has <code>CRAWL4AI_MCP_OAUTH_*</code>, <code>COMFYUI_MCP_OAUTH_*</code> that <code>server.py</code>
never consumes; code hardcodes secrets instead of <code>${ENV}</code> substitution.</p>
<h2 id="5-relevant-env-keys-names-only">5. Relevant <code>.env</code> keys (names only)<a class="headerlink" href="#5-relevant-env-keys-names-only" title="Permanent link">&para;</a></h2>
<p>Gateway: <code>GENERIC_CLIENT_ID/_SECRET/_REDIRECT_URI</code>,
<code>GENERIC_{AUTHORIZATION,TOKEN,USERINFO}_ENDPOINT</code>, <code>GENERIC_CLIENT_USE_PKCE</code>,
<code>OAUTH_SCOPES</code>, <code>OAUTH_TOKEN_URL</code>.
Per-server: <code>NEXTCLOUD_MCP_OAUTH_CLIENT_ID/_SECRET</code>,
<code>PAPERSEARCH_MCP_OAUTH_CLIENT_ID/_SECRET</code>,
<code>MARKITDOWN_MCP_OAUTH_CLIENT_ID/_SECRET</code> (declared, unused),
<code>CRAWL4AI_/COMFYUI_MCP_OAUTH_*</code> (orphaned).
papersearch data sources: <code>UNPAYWALL_EMAIL</code>, <code>CORE_API_KEY</code>,
<code>SEMANTIC_SCHOLAR_API_KEY</code>, <code>ZENODO_ACCESS_TOKEN</code>, <code>GOOGLE_SCHOLAR_PROXY_URL</code>,
<code>DOAJ_API_KEY</code>. comfyui: <code>COMFYUI_URL</code>, <code>COMFYUI_WS_URL</code>.</p>
<h2 id="6-open-design-decisions-must-resolve">6. Open Design Decisions (must resolve)<a class="headerlink" href="#6-open-design-decisions-must-resolve" title="Permanent link">&para;</a></h2>
<ol>
<li><strong>Hosting model</strong>: DinD gateway vs static <code>mcp-tools.yaml</code> vs LiteLLM-hosted.</li>
<li><strong>How Claude.ai/LobeChat reach a tool</strong>: the MCP transport bridge doesn't exist.</li>
<li><strong>Port allocation</strong>: all servers hardcode <code>:8000</code> — need internal DNS, no host publish.</li>
<li><strong>Uniform npx/uvx/docker run model</strong>: prebuilt images vs runtime install.</li>
<li><strong>Auth model</strong>: gateway-terminated vs per-MCP vs pass-through (callback is broken).</li>
<li><strong>Secret handling</strong>: hardcoded → <code>${ENV}</code> from <code>ai/.env</code>.</li>
<li><strong>comfyui server</strong>: image vs npm; keep only once ComfyUI itself is stable.</li>
<li><strong>Discovery for LobeChat/LiteLLM</strong>: <code>/mcp.json</code> is OAuth-gated, lists config not endpoints.</li>
</ol>
<h2 id="7-recommended-path-ordered-lowest-risk-first">7. Recommended Path (ordered, lowest-risk first)<a class="headerlink" href="#7-recommended-path-ordered-lowest-risk-first" title="Permanent link">&para;</a></h2>
<ol>
<li><strong>Pick the static-compose path, not DinD</strong> — lowest risk on a single NUC;
DinD adds socket-exposure risk + a broken SSE bridge for little gain.
Fix and re-enable <code>mcp-tools.yaml</code> (uncomment <code>ai/docker-compose.yml:6</code>).</li>
<li><strong>Fix <code>mcp-tools.yaml</code></strong>: dedupe <code>markitdown-mcp</code>, fix <code>comfyui-mcp</code> env <code>=</code>,
unique service names → <code>ai-internal</code> DNS, pin images, drop comfyui for now.</li>
<li><strong>One streamable-http reverse proxy keyed by path</strong> (<code>mcp.nuclide.systems/&lt;server&gt;</code>)
via Zoraxy or a small <code>httpx</code> proxy — replace the fake SSE stub. Backends stay
internal on <code>ai-internal:8000</code>, never host-published.</li>
<li><strong>Move secrets to <code>${ENV}</code></strong> from <code>ai/.env</code> (keys already exist).</li>
<li><strong>Fix OAuth callback</strong>: exchange code against <code>GENERIC_TOKEN_ENDPOINT</code>.</li>
<li><strong>Verify each upstream image/tool exists</strong> before marking a server "working".</li>
<li><strong>Defer the DinD gateway + Web UI</strong> to phase-2 (read-only status over the
running compose, not spawning).</li>
<li><strong>Answer the litellm question</strong>: once stable <code>https://mcp.nuclide.systems/&lt;server&gt;</code>
URLs exist, populate <code>litellm-config/config.yaml</code> <code>mcp_servers:</code> so
LiteLLM/LobeChat discover them — no bespoke discovery path needed.</li>
</ol>
</article>
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