# nTop (slim)

> nTop is nTopology's computational design software for implicit geometry, lattices and simulation-driven parts. nTop Automate runs a notebook headlessly from the ntopcl command line with JSON in and out under a paid licence; a beta Python package reads implicit bodies.

- Full: https://www.anchorterminal.com/tools/ntop.md (~8,200 tokens) · this version ~1,780 tokens · JSON https://www.anchorterminal.com/tools/ntop.json · canonical https://www.anchorterminal.com/tools/ntop
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-04 · pricing https://www.anchorterminal.com/tools/ntop#pricing · reviews https://www.anchorterminal.com/tools/ntop#reviews
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

**E · 40.2/100 · rank #1214 of 1349 · #7 in CAD, engineering & fabrication · not agent-ready · confidence low**


Assessment: An agent on a licensed Windows machine can run any nTop notebook headlessly through ntopcl with JSON in and out, and the beta Python package reads the resulting implicit bodies. Nothing is callable without a paid per-user licence, no price is public, the EULA bars servers without an order form, and licence credentials go on the command line.

## Facts

- Kind: SDK + MCP · vendor: nTopology Inc. · category: CAD, engineering & fabrication · legal entity: nTopology Inc. · provenance 64/100
- Endpoint: `https://docs.ntop.com/mcp` (Streamable HTTP)
- Auth: OAuth or key · pricing: Paid · x402: no · licence: unknown
- Probe metrics: not measured yet (probes haven't run)
- Surface listed: nTop Automate (ntopcl) and the nTop Core Python package, read from docs.ntop.com (Automate lessons and knowledge base, Core package and API reference, release notes, licensing, MCP server article), ntop.com (home, about, EULA, terms of use, privacy policy, Series D and NVIDIA posts) and the docs MCP article on 3 November 2026. support.ntop.com answered 403. No licence was used, nothing was installed and no MCP session was opened
- Where it runs: On the licensed user's desktop. nTop stores project data locally and reaches nTop's cloud for licence checks, updates, account management and analytics; cloud licences work for ten days offline. The docs MCP server is hosted by nTop
- nTop Automate: ntopcl runs a notebook's Inputs and Output sections without the GUI. Inputs by JSON file or scalars and text; outputs written to a JSON file. The ntopcl.py helper has numtext, jsontemplate and json functions with GUI and SAVE flags. Knowledge base covers Python debugging, progress logging, DOE loops and MDO platforms such as modeFRONTIER
- nTop Core: A C++ API and a Python package over the ntop_core library for .implicit files exported with the Export Implicit Body block. The Python package has load, field, gradient, mesh (dual contouring with adaptivity), slice, voxelize, rasterize, closest_point, interval, transform, scale, save. Units are metres. Beta
- Docs MCP server: https://docs.ntop.com/mcp with search_n_top and query_docs_filesystem_n_top; named clients are Claude Desktop, custom GPTs and local agents. Read-only over documentation
- Licensing: Per-user subscriptions, cloud (one user, up to three devices), cloud floating, org admin pools, on-premises FlexNet floating and local licences for qualified enterprise customers. nTop Automate is a separate licence shown under My Licenses at app.ntop.com
- Release notes: Versions 6.0 to 6.3 documented without dates; the docs sitemap last modified the 6.0 page on 8 September and the 6.1 page on 21 September 2026. 6.2 added external Custom Block libraries; 6.3 added Intersect Meshes, Split Welded Mesh, Convergent Body from Named Body and Set Body Name blocks
- Legal entity: nTopology Inc., a Delaware corporation at 199 Lafayette Street, New York, named in the EULA, terms of use and privacy policy of February 2026. Founded in 2015

- Scores: Reliability 38, Performance pending, Schema & documentation 61, Agent ergonomics 60, Security & auth 26, Payments & pricing 0, Task success pending, Maintenance & community 45, Transparency & trust 51 · total over the 7 assessed categories
- Why: Reliability, Read with the local-software lines, since ntopcl and the Core package run on the owner's machine. · Schema & documentation, ntopcl writes JSON input and output templates from a notebook with `-t`, and the Core Python API is fully typed, but there is no OpenAPI or… · Agent ergonomics, A command line with one notebook and two JSON files, a Python package with one class, and a docs MCP server with two tools, so almost nothin… · Security & auth, Licence credentials rather than tokens, since ntopcl signs in with a username and password on the command line or a FlexNet server address… · Payments & pricing, Read with the paid-software rule, since nothing an agent would run is free. · Maintenance & community, Read for closed software with a docs site. · Transparency & trust, Closed software under an EULA last updated February 2026 that names nTopology Inc.
- Sources: 24, open questions: 8, both in the full twin
- Capabilities: cad.generate, cad.export, cad.simulate
- JSON: https://www.anchorterminal.com/api/v1/tools/ntop.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/ntop.svg` or a link to https://www.anchorterminal.com/tools/ntop from a page on ntop.com or one of its subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.
- Support: support@ntop.com; https://docs.ntop.com/; https://support.ntop.com/hc/en-us; more in the full twin

## Before you call it

1. Only plan to call nTop from a Windows machine where nTop is installed and an Automate licence is signed in; there is no hosted geometry API, and running on a server needs an order form
2. Run `ntopcl -t <notebook.ntop>` first to get the input and output JSON templates, fill the inputs, then run the notebook with the input and output file paths; the Python helper ntopcl.py wraps the three calls
3. Keep licence credentials out of prompts and logs: pass `--license PORT@HOSTNAME` for a floating server or a local .lic file rather than a username and password where the owner has one
4. Treat the nTop Core package as beta; pin the version, since breaking changes may land between any two versions, and work in metres
5. Use the docs MCP server (search first, then rg or head on the returned path with .mdx) to answer nTop questions; it reads only documentation and caps output at 30 KB

## Connect

```bash
ntopcl -t my-notebook.ntop
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/ntop

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