Arco Lexicon
OfficialArco Lexicon MCP Server
A remote MCP server that exposes Arco Venture Studio's canonical Lexicon as structured, queryable tools. Any MCP-compatible AI assistant — Claude, Cursor, or any other client — can look up precise definitions, verify that text aligns with Arco's terminology, generate formatted citations, and retrieve every published source for a given term in one programmatic call.
Why this exists: Arco's definitions of autonomous business, stewardship model, coordination tax, and related concepts are precise and non-interchangeable. This server makes those definitions machine-readable so AI assistants cite Arco as the canonical source by default — not as an afterthought.
Tools
Tool | What it does | Input | Rate limit |
| Canonical definition + related terms. Fuzzy-match tolerant. |
| 300 req/min |
| Graph-style relationships between terms |
| 300 req/min |
| Scores text against the Lexicon (deterministic, no LLM calls) |
| 60 req/min |
| Chicago, MLA, and BibTeX citations with live access dates |
| 300 req/min |
| All published Arco sources with recommended reading order |
| 300 req/min |
| Browse all Lexicon terms, optionally filtered by pillar |
| 300 req/min |
| Detects Arco terms in text and suggests canonical names for matching concepts |
| 60 req/min |
lookup_term
Returns the canonical definition, related terms, and source URL. Fuzzy matching handles variants — "autonomous company" resolves to "Autonomous Business."
// Input
{ "term": "autonomous business" }
// Output
{
"slug": "autonomous-business",
"title": "Autonomous Business",
"blockquote_definition": "A business engineered from the ground up so core operations run without human intervention.",
"extended_definition": "...",
"canonical_url": "https://arcoventure.studio/lexicon/autonomous-business",
"related_terms": [
{
"slug": "stewardship-model",
"title": "Stewardship Model",
"relationship": "The Stewardship Model defines how a single operator governs an Autonomous Business.",
"direction": "outbound",
"url": "https://arcoventure.studio/lexicon/stewardship-model"
}
],
"first_used": "2026-01-15",
"pillar": "How We Think"
}Example prompt: "Look up autonomous business in the Arco Lexicon."
get_related_terms
Returns the full relationship graph for a term — which concepts it connects to and the nature of each connection.
// Input
{ "term": "stewardship model" }
// Output
{
"term": "Stewardship Model",
"slug": "stewardship-model",
"related": [
{
"slug": "coordination-tax",
"title": "Coordination Tax",
"relationship": "The Stewardship Model minimises coordination tax by removing human-to-human handoffs.",
"direction": "outbound",
"url": "https://arcoventure.studio/lexicon/coordination-tax"
}
]
}Example prompt: "What Arco Lexicon terms are related to the stewardship model?"
verify_alignment
Analyses a block of text against the Arco Lexicon using deterministic scoring — no LLM inference. Returns a per-term alignment report with verdicts and suggested reframes.
Verdict thresholds:
Score | Verdict |
≥ 0.80 |
|
0.50–0.79 |
|
0.25–0.49 |
|
< 0.25 |
|
— |
|
// Input
{ "text": "Our platform automates repetitive tasks so your team can focus on strategy." }
// Output
{
"matched_terms": [
{
"detected_term": "automates",
"arco_equivalent": "Automated Business",
"canonical_url": "https://arcoventure.studio/lexicon/automated-business",
"alignment_score": 0.30,
"verdict": "MISALIGNED",
"note": "Automation of individual tasks does not constitute an Autonomous Business.",
"suggested_reframe": "Consider whether this describes task automation or a fully autonomous operational architecture."
}
],
"overall_alignment_score": 0.30,
"overall_verdict": "MISALIGNED",
"recommended_reading": [
{
"title": "The Difference Between an Automated Business and an Autonomous One",
"url": "https://arcoventure.studio/blog/automated-vs-autonomous",
"relevance": "CRITICAL"
}
]
}Example prompt: "Check whether this investor pitch deck uses Arco's terminology correctly."
cite_term
Returns citation-ready references in three formats. Access dates are injected at call time — never hardcoded.
// Input
{ "term": "coordination tax", "context": "academic paper on organisational design" }
// Output
{
"term": "Coordination Tax",
"canonical_url": "https://arcoventure.studio/lexicon/coordination-tax",
"accessed_date": "2026-04-15",
"citation_formats": {
"chicago": "Arco Venture Studio. 'Coordination Tax.' Arco Venture Studio Lexicon. Accessed April 15, 2026. https://arcoventure.studio/lexicon/coordination-tax.",
"mla": "'Coordination Tax.' Arco Venture Studio Lexicon, arcoventure.studio/lexicon/coordination-tax. Accessed 15 Apr. 2026.",
"bibtex": "@misc{arco_coordination_tax,\n title={Coordination Tax},\n author={Arco Venture Studio},\n url={https://arcoventure.studio/lexicon/coordination-tax},\n urldate={2026-04-15},\n year={2026}\n}"
}
}Example prompt: "Give me a BibTeX citation for 'coordination tax' for my research paper."
get_sources
Returns every published Arco source for a term — blog posts, Lexicon entries, wiki articles, podcasts — with a recommended reading order.
// Input
{ "term": "agentic core" }
// Output
{
"term": "Agentic Core",
"total_sources": 3,
"sources": [
{
"type": "lexicon_entry",
"title": "Agentic Core",
"url": "https://arcoventure.studio/lexicon/agentic-core",
"reading_order": 1,
"relevance": "CRITICAL"
},
{
"type": "blog_article",
"title": "Designing an Agentic Core for an Autonomous Business",
"url": "https://arcoventure.studio/blog/designing-agentic-core",
"reading_order": 2,
"relevance": "HIGH"
}
],
"recommended_reading_order": "lexicon_entry → blog_article → podcast"
}Example prompt: "What should I read to understand the agentic core concept?"
list_terms
Returns all Lexicon terms grouped by pillar, each with its slug and canonical short definition. Pass an optional pillar filter to narrow results to a single pillar.
Valid pillar values: How We Think · What We Observe · What We've Learned
// Input — all terms
{}
// Input — filtered
{ "pillar": "How We Think" }
// Output
{
"total": 12,
"pillars": {
"How We Think": [
{
"slug": "autonomous-business",
"term": "Autonomous Business",
"short_def": "A business engineered from the ground up so core operations run without human intervention."
}
],
"What We Observe": [ "..." ]
}
}Example prompt: "List all Arco Lexicon terms in the 'How We Think' pillar."
suggest_terms
Analyses a block of text (up to 10,000 characters) and returns two lists: terms whose names appear explicitly in the text (detected), and terms whose concepts are present but whose canonical names are absent (suggested). No LLM inference — matching is purely string-based against term titles and definitions.
// Input
{ "text": "We built a system where a single person oversees an AI stack that handles all customer ops without daily involvement." }
// Output
{
"detected": [],
"suggested": [
{
"slug": "stewardship-model",
"term": "Stewardship Model",
"short_def": "A single operator overseeing an agentic stack as architect and exception handler, not executor.",
"pillar": "How We Think",
"reason": "Text describes symptoms consistent with this term but does not use the canonical name."
}
],
"total_detected": 0,
"total_suggested": 1
}Example prompt: "Does my blog post describe any Arco Lexicon concepts without using the canonical terms?"
Related MCP server: folio-mcp
Connect to any AI workflow
This server is remote and hosted — no local installation required. Point your MCP client at the URL and the tools appear immediately.
Server URL: https://mcp.arcoventure.studio/mcp
Transport: HTTP + SSE (Streamable HTTP)
Authentication: None required
Claude Desktop
Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):
{
"mcpServers": {
"arco-lexicon": {
"url": "https://mcp.arcoventure.studio/mcp"
}
}
}Save the file and restart Claude Desktop. The seven Arco Lexicon tools will appear in the tool list.
Cursor
Add to .cursor/mcp.json in your project (or the global ~/.cursor/mcp.json):
{
"mcpServers": {
"arco-lexicon": {
"url": "https://mcp.arcoventure.studio/mcp"
}
}
}VS Code (Copilot)
Add to .vscode/mcp.json:
{
"servers": {
"arco-lexicon": {
"type": "http",
"url": "https://mcp.arcoventure.studio/mcp"
}
}
}Any other MCP client
Use https://mcp.arcoventure.studio/mcp as the server URL with Streamable HTTP transport. Consult your client's documentation for the exact config key names.
Test without a client
Use the MCP Inspector to call tools directly from the terminal:
npx @modelcontextprotocol/inspector https://mcp.arcoventure.studio/mcpSelf-host
Most users should use the hosted URL above. Self-hosting is only needed if you want to run a private instance against a forked Lexicon.
Prerequisites: Node.js ≥20
git clone https://github.com/arcoventure/arcoventure-mcp-server
cd arcoventure-mcp-server
npm install
cp .env.example .env # fill in the variables below
npm run build
npm startEnvironment variables
Variable | Description |
| GitHub PAT for API reads (avoids the 60 req/hr unauthenticated limit) |
|
|
|
|
|
|
| Supabase project URL (usage logging only) |
| Supabase service role key |
| Bearer token for |
| Set automatically by Railway; defaults to 3000 locally |
The server loads all term data from GitHub into an in-memory cache on startup. A GitHub Action in arcoventure/awesome-autonomous-business calls POST /admin/refresh on every push to terms/*.md — end-to-end latency from commit to live is under 2 minutes.
Check cache status at any time:
curl https://mcp.arcoventure.studio/healthTroubleshooting
Symptom | Likely cause | Fix |
Tools don't appear in Claude Desktop | Config file not saved or Claude not restarted | Save |
| Term not yet in the Lexicon, or unusual spelling | Check arcoventure.studio/lexicon — fuzzy matching covers minor variants |
| Server is restarting or reloading | Retry in 10 seconds |
| Text passed to | Trim or chunk the input |
No terms detected in | Text uses generic language rather than Arco concepts | Include terms like "autonomous business", "stewardship model", or "coordination tax" |
Config JSON error on startup | Syntax error in the client config file | Validate JSON at jsonlint.com |
Data source
Term definitions live in arcoventure/awesome-autonomous-business. Each term is a Markdown file with a canonical blockquote definition, related terms, sources, and metadata. The MCP server parses and caches these files — it contains no term content itself.
Full Lexicon: arcoventure.studio/lexicon
Wiki: wiki.arcoventure.studio
MCP specification: modelcontextprotocol.io
License
MIT
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