Tinker, in short.

What Tinker is

Tinker is Tinder for AI trading agents. You swipe through agent characters, match with one, tune it, see how it would have done on past prices, and then add it to Robinhood: your own AI app connects to your Robinhood account, and Tinker tells it your agent's rules. Built for Robinhood Chain.

Every agent is a little character with a face. Its mood shows its personality and how its tests are going: calm, confident, nervous, sleepy, and so on.

Today, My agents, Explore

Today is home once you have an agent in this browser or your account. One sentence says what each agent's rules say on the last market close (buy, sell, keep holding or wait, each ticker in its agent's colour), then your agents with what their rules say, each with Add to Robinhood, then what just happened: your AI app asking Tinker about them.

What your rules say today lists the agents whose rules say buy or sell. Tinker cannot see your Robinhood account and never approves, places or pauses an order there. Approve it in your AI app opens the app that last asked Tinker about the agent (or Connect, when none has), where Tinker's instructions ask your AI to show you the order and wait for your yes. To pause real trading, switch Robinhood off in your AI app (see Removing the connection, below).

Linked to your AI app on Today and My agents counts your own agents that an AI app asked Tinker about in the last 7 days (the Connected check, below). Nothing about other people is counted.

My agents stacks your agents in their own colours, each with where it is (Draft, Saved, Linked to your AI app) and its next step, and the + starts Make an agent. Explore is every ready-made agent as a card that leads with its test, $1,000 since 2016 and its worst dip, with a tab per style and a filter by what they buy; Start from opens it in Make an agent. The home page has the deck: swipe right, or Match, on the one you like. Make an agent is the one place agents are made, as the stages below, with the stepper at the top and Back to where you were. Add to Robinhood, on every agent, opens the steps for your own AI app straight away.

The six stages

Make an agent is short screens under one numbered stepper, the same names and count as How it works:

Match. Swipe through ready-made agents, each with a face, a name and a trading style, and match the one you like. It's a match: name it (My Zip to start with). It is saved as a draft in My agents at once.
Rules. One sentence with blanks you tap to change: what it buys, when it buys, how much each time, when it sells, the most it can have in at once, and which AI runs it. Amounts and the sell point can be typed in. Or describe the idea in your own words and it fills the blanks for you; anything it cannot turn into a blank, it tells you. The last number is the one risk number: the most it can have in at once. Boldness moves it too.
Personality. Six legendary trading styles as characters: the patient value buyer, the trend rider, the contrarian, the macro thinker, the momentum hunter and the quant. Inspired by history, described in our own words. Picking one brings its own bars and trigger (it asks first if you changed yours, and Undo puts things back), and a name that came with a character follows the style. Then the three traits on every card: Boldness, Patience and Speed, each saying in plain words what it does right now (Speed at 50: it waits about a week between buys). Conviction and Discipline are under More settings. Calmer, As the style and Bolder move all five together.
Test. How $1,000 would have done on past daily prices since 2016: the curve with every trade marked, the worst dip, the trades, the best year, one sentence next to simply holding the stock, and the full result. The chart says Sample prices or Real daily prices on itself.
Keep. Still call it My Zip? Give it its final name, look at its card and keep it. Then one next step: Add to Robinhood.
Add to Robinhood. Add it to the AI app you already use, next to Robinhood, step by step. Your AI app does the trading; Tinker never does.

Every change is tested on past daily prices at once, and the character's mood, the live test, the test card and Keep it all show that one result. Each result says what it ran on: real prices and their years, or sample data where the site has no real prices yet. Rules, Personality, Test share a results bar ($1,000 to what since 2016, the worst dip and the trades), at the bottom of a phone's screen or beside the screen on a computer, with the screen's one button.

Every blank and bar has a small ? that says what it does, with your agent's own numbers. Every trade in the list names the rule that made it. What would it do today? runs the rules on the last day of the prices and says what it would do, or what it is waiting for. All of it is what the rules did on past or sample prices, never advice.

Keep saves an agent on this device (or in your account) with its exact rules and their fingerprint, so opening it later gives back the very same agent. Copy share link puts the whole agent into a link: whoever opens it gets the same choices and rules, and nothing is stored on a server. A shared link shows the agent's own card in a chat or a post: its character in its mood, its sentence and its result with what it ran on. A link that was changed after it was made does not open.

The prices

Tests run on daily prices: the open and the close of every trading day, adjusted for splits and dividends, so a dividend counts as if it stayed in the stock. Where a ticker has no real prices on the site yet, its test runs on sample data made up for this preview, and the result says so.

Prices: Alpaca (IEX). Daily bars from 2016, adjusted for splits and dividends.

How a test trades: the agent decides after each day's close and sees only prices up to that close. Its order fills at the next day's open, with a 0.05% trading cost on every buy and every sale. No commission (Robinhood charges none) and no taxes. Fractional shares, as Robinhood allows. $1,000 to start. Past prices say nothing certain about future ones.

The full result, under every test: every trade with the rule that fired and why, the money over time next to simply holding the same ticker, how far under its last high it was each day, each year, and the numbers in plain words (worst drop and when it got back, the longest wait to get back, time in the market, sales that ended ahead, the best and worst trade). One tap runs it through a stretch: the 2020 crash, the 2022 slide, the AI rally, a flat and choppy year picked from the prices, or the whole period, each with a fresh $1,000. The trades download as a CSV that says what they ran on.

Adding it to Robinhood

Tinker does not trade, and it never holds your login, a key or money. Your agent runs in the AI app you already use (Claude, ChatGPT, Grok, Cursor or Codex), next to Robinhood's own connection. Add to Robinhood, on every agent and as the builder's last step, walks you through it in Robinhood's own order, one action at a time, with a checklist this device remembers. While Tinker runs on sample prices, it says to wait for real prices: you can set it all up, and Tinker tells your AI app to wait, with no buy and no sell.

What goes where

Robinhood's link (https://agent.robinhood.com/mcp/trading) goes into your AI app as a custom connector. You sign in there with Robinhood's own login, and Robinhood asks you to open an MCP account for your agent: a separate account, and the only one it can trade in. Robinhood's own guide.
Tinker's link (https://tinkeragents.fun/api/mcp/ and your agent's code) goes into the same app as a second connector, with no sign in. It is the brain: asked what your agent would do now, it runs your agent's exact rules on the last market close and answers buy, sell or wait, with the amount and the reason, never more than your agent's own limits. It only reads.
The instructions go into the chat: your agent's rules in plain words with its fingerprint, how to ask Tinker, and one rule above the rest: show you every order and wait for your yes.

Why Tinker does not connect to your Robinhood account itself

Tinker could, in theory, hold your Robinhood sign-in and place orders for you from its own server. It does not, for three reasons:

Robinhood does not allow it without its written consent. Its Customer Agreement says a product built on its API or MCP needs Robinhood's express written consent, and that your use is for your own personal use. Its help pages list AI apps and your own computer as the places to connect from, and say that third-party apps may not control your Robinhood app.
It would make Tinker something else. A site that holds people's brokerage access and places trades from its own rules is in a very different legal position from one that publishes the same rules to everyone. That would likely call for registrations and duties Tinker does not have.
Your money stays in your hands. Your AI app talks to Robinhood. Tinker only answers what the rules say. Its instructions ask your AI to show you each order and wait for your yes, and you can turn on trade approvals in Robinhood too (they are off by default for an AI app's account).

What Tinker does instead is make that hand-off as short as each app allows.

One tap, where your app allows it

Claude: Add Tinker to Claude opens claude.ai's Add custom connector with the name and your agent's link filled in. You check them and add it. Add Robinhood to Claude does the same with Robinhood's own link.
Cursor: Add Tinker to Cursor (and Add Robinhood to Cursor) opens Cursor on your computer, which asks before it installs.
ChatGPT and Grok: no such link exists yet, so you copy the link and paste it.
Codex: a one-line command for the terminal, or the lines for its config file, each with a copy button.

The Connected check

When your AI app calls Tinker about an agent, Tinker notes two things for that agent: when it happened, and the app's own name as the app gives it when it connects (such as claude-ai). It notes no address, no browser, no account and nothing your AI asked or was told. That is how Connect can say “Tinker heard from your Claude 2 minutes ago”, tick its steps by itself and cheer, and how Today counts your agents in your AI app. Each note is kept 7 days after the last call, then deleted.

It is per agent, not per person: if someone else connects the very same agent, their calls count too.

Ask it now

Under the steps, Ask it now shows the answer Tinker gives your AI app for this agent right now: buy, sell or wait, the reason, and the prices it decided on with where they came from. It is the same answer, from the same tool, for the agent holding nothing (your AI adds the buys it holds). It is rules on prices: not advice and not an order.

What Tinker can and cannot see

Tinker sees only what your AI app puts in a question to it: which agent, and, if your AI adds them, the buys this agent made and still holds (a day, a price, a number of shares), used for that one answer and kept nowhere. The one thing it notes is the Connected check above. It never sees your Robinhood login, your account, your balances, your other holdings or your money, and it cannot place, change or cancel an order. The connection to Robinhood is between your AI app and Robinhood; Tinker is not part of it.

Every answer from Tinker ends with the same line: Rules on past and live prices, not advice. Every order is yours, in your own account, at your own risk. Until real prices are on, its answers run on sample prices made up for this preview and say so: place no order from them.

Staying in charge

Turn Robinhood's Trade approvals on, so every order waits for you to place it: in the Robinhood app, open your MCP account, tap your connected agent, then Safety Controls. Robinhood says this is still rolling out for MCP accounts and starts off. Robinhood on trade approvals.
Move into the MCP account no more than the most your agent ever has in at once. Connect shows that number for your agent.
Keep your AI app asking you before it uses Robinhood's tools.

Removing the connection

Claude: Customize (or Settings), Connectors, then Remove next to Tinker. Robinhood comes out the same way.
ChatGPT: In Plugins on chatgpt.com, open Tinker and remove it. Robinhood comes out the same way.
Grok: On grok.com/connectors, remove Tinker. Robinhood comes out the same way.
Cursor: Customize, then switch Tinker off, or delete its lines from ~/.cursor/mcp.json.
Codex: Settings, MCP servers, then delete Tinker. In a terminal: codex mcp remove tinker.

Taking Robinhood out of your AI app ends its access the same way. Signed out, Tinker keeps nothing about you (an account keeps what Your account lists); the Connected check for an agent goes by itself 7 days after its last call.

Not in the US

Agentic trading on Robinhood is for its US accounts. Anywhere else, you can still build agents here and test them on past prices.

The steps were checked against Robinhood's and each app's own help pages on Oct 16, 2026. Menus get renamed; when yours says something a little different, the app's own help page has the latest.

Your account

An account is optional. Signed out, Tinker works as it always has, with everything kept in this browser. Signed in, your agents follow you: the same saved agents, Connect checklist and settings on any device you sign in on, and Today greets you by name.

Signing in with your wallet

No password and no email. Tinker writes one short message in the standard Sign-In with Ethereum form. It names this site (tinkeragents.fun), Robinhood Chain (chain ID 4663), a one-time code and the moment it ends, ten minutes later. Your wallet shows it and you sign it. Signing costs nothing and sends no transaction: nothing reaches the chain and nothing touches your money. Tinker checks the signature once and does not keep it.

On a computer, a wallet in the browser works (MetaMask, Rabby, Coinbase Wallet and others). On a phone, Open in MetaMask opens Tinker inside MetaMask's own browser, where you sign; a wallet app with its own browser works the same way.

A sign-in lasts while you use it: it ends after 3 days unused, and after 30 days in any case. Your account lists where you are signed in, with Sign out for each and Sign out everywhere.

What an account keeps, and what it does not

Kept: your wallet address; the name you set, if any; your saved agents (their rules, fingerprint, name and look); your Connect checklist; which first-time tips you have seen; and for each sign-in, when it started and was last used, with a device word such as “Safari on an iPhone”.
Not kept: no email, no IP address, no signature, no password, no balances. Tinker asks your wallet for that one signature and nothing else.

Bringing a browser's agents along

When you sign in, Tinker lists the agents this browser has of its own and offers to bring them into your account in one tap. Nothing moves until you tap, and Not now leaves them where they are (My agents offers it again). The same rules are never kept twice, and a save that needs fixing stays in the browser.

Deleting your account

In Your account, Delete account deletes it: your name, saved agents, checklist and settings, and every sign-in. Your wallet is untouched. Signing in again later starts a fresh, empty account.

Every agent has its own page at its link: the character, its name, style and sentence, its test on past prices with what it ran on. Anyone can open it, signed in or not.

Add to Robinhood opens the steps for your own AI app, for that agent.
Start from opens it in Make an agent as yours to tune, saved as a draft in My agents.
Share copies the link, opens your phone's share sheet, opens X with the words filled in (nothing is posted until you post it), or downloads the card as a picture, wide or square. The words never promise anything, and a result added to them says what it ran on: sample prices, real past prices.
Names cannot hold links or slurs. Report this agent at the foot of its page sends the agent and a reason to Tinker, nothing about you. Tinker's owner can hide an agent: its page then says so, and it leaves Explore.

The legal line

Tinker is a tool for building and testing trading agents, and you use it at your own risk. It is not investment advice or financial advice. Tinker never holds your money, never places an order and never sees your brokerage account: a real trade only ever happens in your own account, through your own AI app. Results on past prices or sample prices are simulations and promise nothing about the future.

The trading styles are inspired by well-known approaches to markets, not by any real person, and no one endorses Tinker. Not affiliated with Robinhood. Robinhood is a trademark of its owner, named here only to say what Tinker works with. Sample prices are made up for this preview and every result on them says so. $TINKER has no promise of any value and gives no right to any revenue.

The full words: the Terms (use at your own risk, no advice, no custody, what is not allowed, moderation) and Privacy (what Tinker keeps, for how long, and how to delete it).

Make an agent