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Tools for AI Agents at the Lab Bench
Ask your AI assistant how much sodium chloride to weigh for 450 mL of a 233 mM solution. It will answer quickly and confidently, and it is probably right.
Probably is a strange word to hear just before you put something on a balance.
Why a clever assistant can still be wrong about arithmetic
A language model is a remarkable thing. It has read more chemistry than any of us will. But when it gives you a number, it doesn't calculate the way a calculator does. It writes the answer the way it writes everything else: one piece at a time, choosing what most likely comes next.
Most of the time that lands on the right number. Now and then it doesn't. Nothing in the answer tells you which time is which. The wrong number looks exactly as confident as the right one.
Picture a colleague who has read every textbook in the library, and who does all their arithmetic in their head. You'd ask them anything about your experiment. But you wouldn't let them weigh out your reagents by holding the bottle and judging how heavy it feels. You'd hand them a balance.
Give the assistant a balance
That's what Verbex Lab Tools is: the balance on the bench, for your AI.
The work splits cleanly in two:
- The assistant does what it's good at. It understands what you're asking, works out which calculation you need, and asks you when something's missing.
- Verbex does what code is good at. It calculates the answer exactly, the same way every time, and checks its own work before handing it back.
No AI model runs inside Verbex Lab Tools. When your assistant hands over the numbers, ordinary, predictable code does the arithmetic. Ask the same question a hundred times and you get the same answer a hundred times.
The answer comes with a receipt
A good shop receipt doesn't just say "$23.40". It lists every item, so you can check the total yourself. Verbex answers the same way. Every result is a short notebook entry: the answer, how it was worked out, and a check.
Here is the sodium chloride question again, answered by Verbex:
Weigh 6.127 g, dissolve in water or buffer and bring to 450 mL.
Formula: mass = concentration × volume × molecular weight
Check: 6.127 g ÷ 58.44 g/mol = 104.9 mmol in 450 mL = 233 mM ✓
Then come the things a careful colleague would mention:
- use the molecular weight of the exact form you're weighing, hydrate or salt;
- correct for purity below 100%;
- bring the solution to volume in a calibrated vessel.
The check line is the important part. It runs the calculation backwards to see that it lands where it started. It's the same habit as a pilot reading an instruction back to the control tower: say the number again, out loud, and make sure it matches.
The entry also records which tool made it, its version and the time. Paste it into your notebook or ELN as it is. The working is already written down, so you never have to reconstruct it at the end of the day.
Every tool keeps the same promises
We'll keep adding tools. The list will grow; the promises won't. Every Verbex tool, now and later:
- Gives the exact answer, the same every time.
- Shows its working: the inputs, the formula and the units.
- Checks itself, and says so in a check line.
- Writes a notebook entry you can keep as it is.
- Asks instead of guessing. If a value is missing or makes no sense, it says what's wrong, and your assistant asks you.
- Passes on the cautions that matter: safety notes and lab-practice warnings.
- Keeps your inputs private. They're used to compute the answer and never stored. No account needed.
A new tool that can't meet all seven doesn't ship.
What's on the bench today
At the time of writing, Verbex Lab Tools covers four kinds of bench work:
- Calculations: solution prep and dilutions, serial dilutions, PCR and qPCR master mixes, and lipid nanoparticle formulations.
- Layouts: plate maps from 6 to 384 wells, with replicates and controls.
- Paperwork: protocol and notebook-entry scaffolds, and our free lab documentation templates.
- Records: turning reagent label text into the fields your inventory needs.
Your assistant can also search Verbex's guides on protocols, notebooks and bench math. The current list, with every tool and what it does, is always at verbalexperiment.com/tools.
One plug, many assistants
How does your assistant reach Verbex? Through MCP, the Model Context Protocol, an open standard for connecting AI assistants to outside tools.
Think of it like a power socket. Once appliances and sockets agree on a shape, any lamp works in any room. MCP is that agreed shape for AI tools. Any assistant that supports MCP can plug in Verbex, and every tool we add arrives on its own, with nothing new to install.
To connect, give your assistant this address:
https://www.verbalexperiment.com/mcp
It's free for everyday use, with no account, no key and nothing to install on your computer. Verbex Lab Tools is in ChatGPT's plugin directory and in the official MCP Registry. It also works with Claude, with coding assistants such as Cursor, VS Code and Codex, and with any app that lets you add a custom connector. The steps for each one are at verbalexperiment.com/agents.
What should happen, and what did
A calculation tells you what should happen: weigh 6.127 g, make it up to 450 mL.
Then the real experiment happens. The balance settles at 6.13. The solution turns cloudy. A meeting runs over and the incubation runs twenty minutes long. Those details are what a lab record is for, and they're the first to disappear if nobody writes them down.
Verbex Lab Tools takes care of the plan. The Verbex app takes care of the record. You speak, type or snap a photo while you work, and every observation keeps its time and the step it belongs to. At the end, Verbex drafts the notebook entry from what you captured, deviations and all, for you to check.
Whoever does the work, a scientist at the bench or, more and more, an automated lab, the record has to say what actually happened. That's the part of the job we care about most.
Your records belong to you. They stay on your device and go nowhere unless you send them. If you ever let an AI assistant work with your notebook, it will be because you chose to, and only for the experiments you choose.
What it doesn't know
A balance is honest about what it measures. So we should be honest too:
- It knows the arithmetic, not your bench. It can't know the real purity of your bottle, your lab's SOPs, or whether your instrument is calibrated. Those stay your judgement.
- It's a calculation aid, not an approval. Check results against your lab's own requirements before you use them.
You do the science
Verbex started with one idea: the record should be done by the time the gloves come off. Your AI assistant can now do the bench math the same way: exactly, with the working shown, written down as it happens.
Let the assistant think with you. Let Verbex weigh it out, and write it down.