Endiagram MCP Server

by dushyant30suthar Your server? Claim it

answering

Endiagram MCP is answering right now. Last checked 10 min ago. 351 installs a week from npm. It exposes 7 tools. Last commit 21 Apr 2026.

EN Diagram — structural verification for concurrent systems. Pure math, no AI.

Installs per day peak 199 · avg 26 · +183% w/w

a month agotoday

Uptime history 91 days of history · worst day 93%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

108 ms

Response time

average over 24h

351

Installs / week

npm and PyPI

What the code does

We read the source, 5 d ago · tools taken from the live server · rules 995398eba69f

A tool parameter reaches a dangerous call

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

A tool parameter reaches a file or shell call render.output → src/index.ts:266, render.output → src/index.ts:268

          writeFileSync(filePath, Buffer.from(result.pngBase64!, "base64"));

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

A tool parameter here reaches a dangerous call

That is not a flaw by itself — but it is where things go wrong when it is not the job. We re-read this code on every release. Watch it and you hear from us the day another one appears.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add endiagram-mcp --transport http https://api.endiagram.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://api.endiagram.com/mcp

~/.codex/config.toml

[mcp_servers.endiagram-mcp]
url = "https://api.endiagram.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "endiagram-mcp": {
      "url": "https://api.endiagram.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "endiagram-mcp": {
      "type": "http",
      "url": "https://api.endiagram.com/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.

Available tools 7

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

compose

compose

How do parts combine, or how does a part stand alone? Merge mode (source_a + source_b + links): declare which entities in A are the same as entities in B; the combined graph is wired via string-equality of shared names. Extract mode (source + subsystem): pull a named subsystem out as standalone EN with boundary inputs/outputs, actors, and locations. Valid subsystem names come from structure's `subsystems` field — call structure on the source first to discover them. See the server instructions for EN language syntax.

equivalent

equivalent

Are two systems the same, or what changes if I change this one? Compare mode (source_a + source_b): structural differences, edit distance, spectral equivalence. isCospectral=true means identical graph structure up to relabeling — topologically the same despite different names, actors, or locations. Evolve mode (source + patch): dry-run a change, shows diff plus new/lost bridge nodes. Patch has three directive types — plain EN statement adds an action; a line starting with `-` (and not containing `do:`) removes the named action; a statement whose action name matches an existing one replaces the original. See the server instructions for EN language syntax.

invariant

invariant

What's always true — automatic findings and on-demand checks. Automatic outputs: conservationLaws (weighted entity sums constant across executions), sustainableCycles (T-invariants — action sequences returning to start state), depletableSets (entity groups whose simultaneous depletion is irreversible), behavioral.deficiency (0 means structure fully determines dynamics), behavioral.isReversible, behavioral.hasUniqueEquilibrium. On-demand via `rules`: encode domain-specific claims and verify them against the graph — this is how to check things the topology alone can't see (precedence, coverage, centrality bounds, resilience). See the rules parameter for supported sentence shapes.

live

live

Can it deadlock? Can entities overflow? isStructurallyLive means every siphon contains a trap — no structural deadlock possible. uncoveredSiphons are entity groups that can drain permanently, with the actors and locations affected. isStructurallyBounded means no entity can accumulate without limit. unboundedCycles are action sequences that could cause overflow. See the server instructions for EN language syntax.

reachable

reachable

Can X reach Y? Follows directed data flow first; falls back to undirected. `from` and `to` accept entity names or action names (resolved against the program). Path shows each step with actor and location. locationCrossings counts boundary transitions. defense_nodes checks if guards cover all paths; coverage.fullCoverage=false means unguarded routes exist. See the server instructions for EN language syntax.

render

render

SVG or PNG diagram. Only call when user explicitly asks to visualize. The rendered image is delivered to the user, not injected into the model's context. See the server instructions for EN language syntax.

structure

structure

What is this system? Returns shape (Pipeline, Fork-Join, DAG, Star, Cycle, Tree, Complete, etc.), stages with roles, bridge nodes, cycles, parallelism, critical path, dominator tree, min-cuts, subsystems, interface nodes, actors (who does what, workload entropy), locations (where work happens, boundary crossings). Levers: node=X returns per-node centrality (betweenness, closeness, eigenvector) for a specific node. detect_findings=true flags named structural risks — unguarded-sink (sinks reachable via only pipeline actions, no JOIN/HUB gating), single-cut-path (source-sink pairs with only one vertex-disjoint path), multi-cut-path (paths with redundant defense, min-cut > 1). See server instructions for EN language syntax.

Endpoints

URL	Transport	State	Latency	Checked
https://api.endiagram.com/mcp	streamable-http	needs auth	87 ms	10 min ago

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Endiagram MCP — questions

Answers built from our own checks of this server.

What can Endiagram MCP do?

It exposes 7 tools, read directly from the server on our last check. Among them: compose, equivalent, invariant, live, reachable, render and 1 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Endiagram MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 108 ms. The bar chart above shows every period we have measured.

How do I connect Endiagram MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own credentials: it refuses anonymous clients.

Does Endiagram MCP need an API key?

Yes. Every time we knock, Endiagram MCP answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is Endiagram MCP?

It answers our handshake in 108 ms on average, which is faster than 90% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Endiagram MCP?

The npm package @endiagram/mcp was installed 351 times in the last week. Week over week that is +183%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Endiagram MCP open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 8 stars on GitHub. The licence covers the code in the repository, not the hosted service at api.endiagram.com, which runs on its operator's own terms.