Ottoref — Standards MCP Server

Name: Ottoref — Standards MCP Server
Author: ottonic

by ottonicversion 0.3.0i★ –iRuns on your computer

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

Install

Overview

Description from the maker (original English)

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

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UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

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

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

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

Run this in your terminal

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

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

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

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 7, 2026

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

Compared with others in Otheri

More stars than 0% of the other 32564 servers in this category
Published to the registry more recently than 83% of the other 32564 servers in this category
Basic checks equal to or better than 100% of the other 32564 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 1 of 1 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 –, and the latest version (0.3.0) reached the registry 7 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: Spec Driven Development, Remote Desktop Commander, Tools MCP

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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

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

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

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Tools MCP

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