Ottoref — Standards MCP Server

Name: Ottoref — Standards MCP Server
Author: ottonic

by ottonicversion 0.3.0i★ 0iRuns on your computer

Registry nameio.github.ottonic/standards-mcp-server

How to install

What it does

ISO 286 limits and fits, ISO 2768 tolerances, material properties, and process limits.

Connects Runs on your computer
Account or key No key needed
Category Other

Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "mcpServers": {
    "standards": {
      "command": "npx",
      "args": [
        "-y",
        "standards-mcp-server"
      ]
    }
  }
}

Done

Quit Claude and open it again
Done
Try it
Use Ottoref — Standards MCP Server and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Ottoref — Standards MCP Server or shows a Ottoref — Standards MCP Server tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Ottoref — Standards MCP Server yet

Ottoref — Standards MCP Server runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Ottoref — Standards MCP Server

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user standards -- npx -y standards-mcp-server

Done

Type /mcp in Claude Code
You should see Ottoref — Standards MCP Server listed as connected
Done
Try it
Use Ottoref — Standards MCP Server and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Ottoref — Standards MCP Server or shows a Ottoref — Standards MCP Server tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Ottoref — Standards MCP Server and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Ottoref — Standards MCP Server or shows a Ottoref — Standards MCP Server tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Ottoref — Standards MCP Server and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Ottoref — Standards MCP Server or shows a Ottoref — Standards MCP Server tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Ottoref — Standards MCP Server💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user standards -- npx -y standards-mcp-server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "standards": {
      "command": "npx",
      "args": [
        "-y",
        "standards-mcp-server"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "standards": {
      "command": "npx",
      "args": [
        "-y",
        "standards-mcp-server"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "standards": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "standards-mcp-server"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: 168/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.3.0
Categoryi: Other
Published to registryi: Oct 31, 2026
Code last changedi: Nov 6, 2026
Maker: ottonic
Packages: npm: standards-mcp-server
Repo: ottonic/standards-mcp-server
Website: github.com
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 13, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account ottonic, which owns the repo
✓ Pass
Still maintained
Code last changed 7 days ago
✓ Pass
Has a licence
Uses MIT
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 0% of the other 19646 servers in this category
Published to the registry more recently than 75% of the other 19646 servers in this category
Basic checks equal to or better than 100% of the other 19646 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Ottoref — Standards MCP Server safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 7 days ago, and the latest version (0.3.0) reached the registry 13 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: World Monitor, Claude Flow, Windmill

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by koala73Widely used★ 90.6KUpdated today

Runs in the cloud✓ service owner · worldmonitor.app

How to connect

Claude Flow

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How to connect

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Ottoref — Standards MCP Server

Reference standards for mechanical engineering, as data an assistant can query: ISO 286 limits and fits, ISO 2768 general tolerances, indicative material properties, and published process feasibility limits. Nothing here comes from a CAD file — it is the reference layer that turns a measurement, or a measurement-plus-drawing question, into an answer you can cite.

Every value is taken from the published tables, carries the edition it came from, and is checked against independent fixtures. Anything the server cannot verify, it refuses with a reason rather than approximating — so a number from this server is one you can put your name to.

Tools

Tool	Returns
`list_standards`	Which standards are implemented, and what within each is covered.
`limits_of_size`	Upper and lower deviations and limits for one ISO 286 class at one nominal size, e.g. `36H7`.
`iso286_applicability`	Exact size intervals where one ISO 286 tolerance class is supported, e.g. `H7`, `j5` or `N9`.
`fit`	Fit type, clearance and interference for a hole and shaft pair at one nominal size, e.g. `12 H7/h6`.
`it_grade`	The standard tolerance value for one IT grade at one size, in micrometres and millimetres (`IT01`, `IT0`, `IT1`–`IT18`).
`general_tolerance`	The ISO 2768-1 general tolerance for a class: linear, broken-edge, or angular.
`general_tolerance_complies`	Whether a stated deviation complies with a general-tolerance note.
`material_properties`	Typical SI properties for one material designation.
`material_coverage`	Which material grades and families are covered.
`process_limits`	Published geometric feasibility limits for a process.
`process_feasibility`	A check of a stated value against those process limits.
`process_list`	Which processes are covered.

What it covers

ISO 286-1:2010, with Cor 1:2013 applied provides standard tolerance grades IT01, IT0 and IT1 to IT18 for nominal sizes up to 500 mm. Shaft limits cover c–h, k, m, n, p, r–v, x–z, and za–zc where Table 4/5 publishes a cell, using its exact size intervals and grade rules. Verified hole classes C, D, E, F, G, H, JS, K, M, N, P, R, S, T, U, V, X, Y, Z, ZA, ZB, ZC use the Table 2/3 ∆ corrections and the M6 exception, and grade-specific shaft j5–j7 (and j8 up to 3 mm) and hole J6–J8 use their own table values. iso286_applicability reports the exact supported size intervals for a class; gaps are stated, never interpolated.

ISO 2768-1:1989 provides general tolerances for linear dimensions (classes f, m, c, v), broken edges (classes f and c), and angular dimensions (classes f, c, v), plus a compliance check for a stated deviation.

Materials are indicative typical values for common metals and plastics, from an Apache-2.0 reference, tagged basis: typical. Process limits are published rules of thumb for cnc-machining, sheet-metal, injection-molding, and additive-sls.

Out of scope, and refused rather than guessed: nominal sizes above 500 mm and the inch counterparts (ANSI B4.2); IT01–IT2 K/M/N/P–ZC combinations and sparse Table 2/3 cells with no published ∆ value; design allowables, fatigue, and high-temperature data; and a specific shop's capability, achievable tolerance, cost, or lead time.

How the values are produced

The values are the published tables, which are normative. The earlier editions also define the tolerance factor i = 0.45·∛D + 0.001·D and give the grades as multiples of it; that arithmetic reproduces the table at 18 mm and above but diverges at the smallest size step, where the published IT18 is 1400 µm against 2500i = 1355 µm. toleranceFactor() is kept as a documented cross-check, and the tests assert both the table and the divergence.

What it does not do

It reports what a standard specifies. It does not decide whether a design is acceptable, whether a fit suits a joint, or whether a part can be made — those are engineering judgements and they stay with you. Approval, compliance, and certification are out of scope.

Install and run

npm install

npm run build node dist/src/index.js # serves MCP over stdio

Point an MCP host at dist/src/index.js. The server serves both protocol eras: the 2025-11-25 handshake that stock MCP hosts negotiate, and the 2026-07-28 envelope through server/discover.

Development

just check          # fmt-check, lint, typecheck, test

just build just test

just check is keyless and needs no data files: the values are in the source.

Packaging

npm pack builds first and includes the compiled server and this README; tests and source maps are excluded. Install the tarball to check the standards-mcp executable with a compatible MCP client.

License

MIT. Third-party notices: THIRD_PARTY_NOTICES.md.

Ottoref — Standards MCP Server

What it does

Install

Install Node.js

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Otheri

Common questions

Others in the same category

World Monitor

Claude Flow

Windmill

README from the maker

Ottoref — Standards MCP Server

Tools

What it covers

How the values are produced

What it does not do

Install and run

Development

Packaging

License