Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
ChemDraw MCP (unofficial)
Overview
Description from the maker (original English)
Molecule names or SMILES to 2D structures, reactions, mechanisms, spectra - offline via RDKit.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- 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
- PyPIPython’s uv installed (for the uvx command)
Which app do you use?
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": {
"chemdraw": {
"command": "uvx",
"args": [
"chemdraw-mcp"
]
}
}
}Run this in your terminal
claude mcp add chemdraw -- uvx chemdraw-mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"chemdraw": {
"command": "uvx",
"args": [
"chemdraw-mcp"
]
}
}
}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.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"chemdraw": {
"type": "stdio",
"command": "uvx",
"args": [
"chemdraw-mcp"
]
}
}
}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.
This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.
Your choice stays on this device in a cookie; no account needed.
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 8, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account jurimaxam-dotcom, 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
- – 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
Compared with others in Otheri
- More stars than 0% of the other 18386 servers in this category
- Published to the registry more recently than 98% of the other 18386 servers in this category
- Basic checks equal to or better than 100% of the other 18386 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 ChemDraw MCP (unofficial) 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 (0.9.0) reached the registry today.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Tethered Trust
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated 2 days ago
Install
Tethered Trust
by tetheredtrust.com
Fit, compatibility and recall checks for AI agents before they buy: verdicts, evidence, receipts.
Runs in the cloudUpdated today
Install
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.
chemdraw-mcp
chemdraw-mcp is an MCP server that lets Claude draw chemistry: structures, reaction schemes, mechanisms, spectra, TLC plates and pH curves, rendered locally with RDKit and matplotlib as PNG and SVG files. Each drawing also opens an interactive panel in the chat — hover a functional group, switch to the PubChem data sheet, rotate a 3D model, export or add an Anki card. It is free and open source (Apache-2.0) and needs no API key, no sign-up and no ChemDraw licence.
"Draw aspirin" in Claude Desktop. Demo edited to shorten the PubChem loading wait.
| Without | With chemdraw-mcp |
|---|---|
| Claude describes a structure in words or writes SMILES you paste elsewhere | the structure appears in the chat, as files ready for a report |
| figures drawn by hand in ChemDraw or ChemSketch | one sentence per figure, one style across the whole report |
| molar mass, CAS number and hazards from three websites | one data sheet from PubChem, or one value as text |
| a pH worked out with an approximation you cannot check | the exact value with the textbook approximation beside it |
Quick start
- [Download the Claude Desktop extension](https://github.com/jurimaxam-dotcom/chemdraw-mcp/releases/latest) (
chemdraw-mcp- .mcpb), double-click it and confirm in Claude Desktop. - Open a new chat and say *"Use the ChemDraw MCP: draw caffeine"*.
- Try a prompt from the tool table below.
Other ways in (PyPI, cloning the repository, editing the config by hand) are under Installation.
Tools
The default profile registers 16 tools in five areas. Each description says which neighbouring tool to use instead, so the model can tell a drawing from a lookup from a calculation. Files go to ~/ChemDraw-Output/.
| Area | Tool | Example prompt | Panel |
|---|---|---|---|
| Draw | generate_molecule | *"Draw caffeine"* | yes |
batch_generate | *"Draw aspirin, caffeine and paracetamol, each as its own file"* | yes | |
compare_molecules | *"What is the difference between ibuprofen and naproxen?"* | yes | |
generate_reaction | *"Draw the esterification of acetic acid with ethanol as a reaction equation"* | yes | |
generate_mechanism | *"Show me the SN2 mechanism step by step"* | yes | |
generate_3d | *"Show methane as a rotatable 3D model"* | yes | |
| Lab graphics | generate_spectrum | *"Draw the IR spectrum of aspirin"* | yes |
generate_tlc | *"TLC of my esterification: educt at Rf 0.3, product at 0.65, co-spot shows both"* | yes | |
generate_titration_curve | *"Which indicator fits the titration of phosphoric acid with NaOH? Show me the curve."* | yes | |
generate_species_distribution | *"Draw the species distribution of phosphoric acid over the whole pH range"* | yes | |
| Look up | lookup | *"What is the CAS number of paracetamol?"* | text |
lookup_molecule_data | *"Give me a data sheet for ibuprofen"* | yes | |
predict_spectrum | *"Which IR bands should aspirin show?"* | text | |
| Calculate | calculate_ph | *"What is the pH of 0.1 M acetic acid, pKa 4.76?"* | text |
| Anki | export_anki_deck | *"I have an exam on NSAIDs on Friday and need to know the structures"* | — |
The 16th tool, save_png, is the server half of the panel's export button. It runs when you click that button and is never called by the model on its own.
What each tool does in detail, the options on the drawing tools (formats, render_style, abbreviate_groups, annotate_stereo) and the known limits: docs/tools.md.
Gallery
Every picture below is the tool's own output, generated by scripts/readme_bilder.py.
generate_spectrum
generate_titration_curve
lookup_molecule_data
calculate_ph
export_anki_deck
generate_mechanism
generate_tlc
generate_3d
Installation
Pick one route — installing twice registers the server twice and the model sees every tool doubled. Afterwards restart Claude Desktop and ask *"draw caffeine"*.
- Claude Desktop extension (macOS, Linux): download
chemdraw-mcp- .mcpbfrom the latest release, double-click it, confirm, restart Claude Desktop once. The first start fetches about 40 MB from PyPI, checked against pinned hashes; later starts are offline. - From PyPI (needs uv):
uv tool install chemdraw-mcpchemdraw-install
Cloning the repository, editing the config by hand, optional extras (Java for offline IUPAC names, AnkiConnect) and the full profile with 23 tools: docs/installation.md and docs/tools.md#profiles.
Something not working? uvx --from chemdraw-mcp chemdraw-doctor checks the installation and prints the fix for each problem.
Development
Architecture, setup and the test gate: docs/development.md.
Feedback, bugs and wishes
- Something broke? Open a bug report — the form asks for the output of
chemdraw-doctor. - Missing something in your course? Tell us what you would draw or calculate — the subject and the exam question help more than a feature name.
- Wrong chemistry? Use the bug form and name the compound and the figure.
- A question, or something you made with it? Discussions.
- It worked for you? A ⭐ on the repository helps other students find it.
License
Apache-2.0 — see LICENSE. Copyright 2026 jurimaxam-dotcom.
Disclaimer: This is an unofficial, independent project, not affiliated
with or endorsed by Revvity. *ChemDraw* is a trademark of Revvity Signals
Software, Inc. This tool does not include or require ChemDraw; it can
optionally export files in the open CDXML format.