# LetThemBuild

> LetThemBuild is a room where several AI models work on one question together: one leads, the others review what it did, and each reviewer can run its own commands. It ships as a Mac, Windows and Linux app with the `ltb` command line, as LetThemChat on the web and iPhone, and as an API and an MCP server. Made by GPULogy AI LLC.

## Start here

- [Agent onboarding skill](https://letthembuild.com/agent-onboarding/SKILL.md): fetch this to install, sign in and start a first discussion for your user.
- [Download](https://letthembuild.com/download): the apps, and the package-manager lines.
- [Pricing](https://letthembuild.com/pricing): free, Pro and Team, and what each includes.

## Docs

### Start here

- [What LetThemBuild is](https://letthembuild.com/docs/what-it-is): One question, several AIs, and a record of what was actually checked.
- [Quick start](https://letthembuild.com/docs/quick-start): Sign in, ask one real question, and read the agreed answer. About five minutes.
- [Quick start on the Mac](https://letthembuild.com/docs/quick-start-mac): Point the room at a repository, let it make one small change, and open a pull request.
- [Install and sign in](https://letthembuild.com/docs/install): Download the app, sign in once, and everything else follows the account.
- [Your first discussion](https://letthembuild.com/docs/first-discussion): Ask something real, watch the room work, and read the receipt at the end.
- [How it fits together](https://letthembuild.com/docs/how-it-fits): The devices, your account, the room, the models, and the path a change takes on your Mac.

### How the room works

- [Seats, the lead and the reviewers](https://letthembuild.com/docs/the-room): Who speaks, in what order, and which one is allowed to change your files.
- [Rounds, agreement and the final answer](https://letthembuild.com/docs/rounds-and-agreement): How the room converges, what happens when it does not, and how to give it more room.
- [Depth: how hard the room works](https://letthembuild.com/docs/depth-and-cost): Four presets that set how many seats take part and for how long.
- [Evidence: verdicts, receipts and findings](https://letthembuild.com/docs/evidence): What makes a review here worth more than an opinion, and how to read it.
- [Reading the Summary](https://letthembuild.com/docs/reading-the-summary): The block under every answer: how it ended, what was run, and what nobody verified.

### Working in a discussion

- [The sidebar, projects and folders](https://letthembuild.com/docs/sidebar-and-projects): Starting discussions, finding old ones, and filing them into projects.
- [The title bar and the workbench](https://letthembuild.com/docs/title-bar-and-tools): The buttons along the top of the Mac window, and the tool panels they open.
- [Reading a discussion](https://letthembuild.com/docs/reading-a-discussion): What the labels on each turn mean, and why most of the transcript is folded.
- [When the answer asks you something](https://letthembuild.com/docs/answers-that-ask): Full answers to general questions, and the question card above the reply box.
- [The Summary card under each run](https://letthembuild.com/docs/reading-a-discussion-receipt): Outcome, checks, timing and cost for one run, and how to ask later whether it still holds.
- [Acting on a reply](https://letthembuild.com/docs/transcript-actions): Copy, read aloud, ask about a passage, rewind, find, share, and steer a run that is still going.
- [The composer](https://letthembuild.com/docs/composer): The message box, what you can attach, and the chips that say where the work happens.
- [Depth, permission and the seat dock](https://letthembuild.com/docs/composer-controls): The chips that decide how hard the room works and what it may do, and who is in the room.
- [Slash commands and the command palette](https://letthembuild.com/docs/slash-commands): Every / command in the order the menu shows it, and the palette that finds everything.
- [The Summary panel](https://letthembuild.com/docs/summary-panel): Everything about one discussion in a side panel: outcome, ticket fields, project notes and next steps.
- [Pull requests and CI from the discussion](https://letthembuild.com/docs/pull-requests-and-ci): The git bar, the pull request rows, and having the room fix checks or merge when ready.
- [Pull request switches](https://letthembuild.com/docs/pull-request-switches): Fix checks, merge when ready and archive on their own, switched from the Mac, the web or the iPhone.
- [Work through a list](https://letthembuild.com/docs/work-through-a-list): Hand over a backlog and come back to one pull request, unattended.
- [Browser, simulator and other apps](https://letthembuild.com/docs/devices-browser-simulator): Letting the room look at and use what it builds: the browser pane, simulators, other Mac apps, and your phone.

### Settings: The room

- [Who's In The Room: the seats](https://letthembuild.com/docs/room-settings-seats): The four seats, which model each one holds, which ones take part, and which one leads.
- [Seats beside the message box, and seats per discussion](https://letthembuild.com/docs/room-settings-seats-2): The seat dock under the composer, each discussion's own room, the room under Run on my Mac, and seats your team holds.
- [How a seat runs: Our Keys and Free Key](https://letthembuild.com/docs/seat-power): The eight ways a seat can run, what the plan allows, and the two that need no key of your own.
- [How a seat runs: your CLI, your key, your endpoint](https://letthembuild.com/docs/seat-power-2): Running a seat on a coding CLI you already pay for, on your own API key, or on any OpenAI-compatible endpoint.
- [How a seat runs: agents and your cloud](https://letthembuild.com/docs/seat-power-3): An ACP agent, somebody else's agent over A2A, or your company's Bedrock or Vertex account in a seat. All three are Mac only.
- [The Configure panel: provider, models and effort](https://letthembuild.com/docs/configure-seat): Everything about one seat in one side panel: which maker it holds, its two models, how hard each one thinks, and how fast it answers.
- [The Configure panel: testing, credit and CLI accounts](https://letthembuild.com/docs/configure-seat-2): The buttons at the foot of a seat's panel, several sign-ins for one CLI, and the role a seat reviews as.
- [Discussion Behaviour](https://letthembuild.com/docs/room-settings-behaviour): How many rounds the room runs, whether the answer is tested, whether the models rank each other, and whether reviewers answer together.
- [Review Policy](https://letthembuild.com/docs/room-settings-review): What happens after the reviewers have spoken, and what each one is asked to look for.
- [Context: compacting turns and tool results](https://letthembuild.com/docs/room-settings-context): How much of a model's window a discussion may fill before the room folds earlier turns and earlier tool results, and when the lead keeps its own model.
- [Context: citations, closing answers, side chats and web pages](https://letthembuild.com/docs/room-settings-context-2): The rest of the Context card, and how long the room keeps a web page a seat has read.
- [Model Prompt Editor: your house rules](https://letthembuild.com/docs/model-prompt-editor): Seven sets of standing instructions, one per role, that each seat reads after its built-in brief.
- [Memory: what the room learns about you](https://letthembuild.com/docs/memory-settings): The Learning switches and the About you list: short facts read into every discussion, on every device.
- [Memory: project notes and imports](https://letthembuild.com/docs/memory-settings-project): Memory kept per repository on the Mac, the notes a run saves to it from the Summary, and importing what you told other assistants.
- [Schedule: discussions on a clock](https://letthembuild.com/docs/schedule-settings): Recurring discussions your Mac starts at a set time, with its seats, its tools and your checkout.
- [Schedule: server runs, triggers and budgets](https://letthembuild.com/docs/schedule-settings-server): Schedules made on the web or iPhone run on our servers with no device awake: budget lines, overnight pricing, chains and HTTP triggers.
- [Prompt Library](https://letthembuild.com/docs/prompt-library): Ready-made prompts, starting points, your own prompts and your team's shelf, to use now or schedule.
- [Prompt Library: editing and new-discussion suggestions](https://letthembuild.com/docs/prompt-library-editing): The prompt editor, your own categories, comparing a copy with its original, and what an empty discussion suggests.
- [Skills: yours and your team's](https://letthembuild.com/docs/skills-settings): Reusable instructions you call with /name: your own, the built-in ones, your team's, and a registry your team serves.
- [Plugins: MCP servers on your Mac](https://letthembuild.com/docs/plugins-settings): Give the lead your issue tracker, database or browser through MCP servers this Mac runs or connects to.
- [Plugins: addresses, pinning and team limits](https://letthembuild.com/docs/plugins-settings-safety): How a plugin by address is checked, why a server's tools are pinned at approval, and what a team can restrict.

### Settings: This Mac

- [General: workspace and tools](https://letthembuild.com/docs/general-workspace-tools): Where new work starts on this Mac, and whether the machine has what the room needs.
- [General: while the room works](https://letthembuild.com/docs/general-while-working): Staying awake during a run, and how background tasks report back.
- [Delegated tasks](https://letthembuild.com/docs/delegated-tasks): How the lead hands part of the job to a discussion of its own: read-only explore tasks and general ones.
- [Launcher and iMessage](https://letthembuild.com/docs/launcher-and-imessage): Asking the room from any app on a shortcut, and from your phone by iMessage.
- [Logs and diagnostics](https://letthembuild.com/docs/logs-and-diagnostics): Letting the seats read a running app's logs, finding the app's own errors, and naming the exact build.
- [Workspace: where it works](https://letthembuild.com/docs/workspace-where-it-works): The folder the room works in, whether it gets its own checkout, and what follows a merge.
- [Workspace: checks and instruction files](https://letthembuild.com/docs/workspace-checks-and-instructions): What the room must have reviewed before a commit, and which project files it trusts.
- [Outside this window](https://letthembuild.com/docs/outside-this-window): The room from a terminal and from your editor, with the seats and keys set up in the app.
- [The sandbox: what a seat can reach](https://letthembuild.com/docs/sandbox): How the Mac holds every command and command-line seat to the project, and what stays out of reach.
- [Sandbox settings, part by part](https://letthembuild.com/docs/sandbox-parts): Every switch on the Sandbox card, the network list, the Swift and Xcode exception, and what a team can lock.
- [Permission modes and what Auto asks](https://letthembuild.com/docs/permission-modes): The six modes on the composer's Permission chip, what Auto still stops for, and how Smart's judge decides.
- [Approval cards](https://letthembuild.com/docs/approvals): What a card offers, the order the checks run in, how long a card waits, and answering from your phone or the web.
- [The Guardrails list](https://letthembuild.com/docs/guardrails-gallery): Every guardrail the Mac can keep for you, what each one does, and how a switch becomes a rule.
- [Guardrails that work on their own](https://letthembuild.com/docs/guardrails-gallery-2): Session policies, protected instruction files, reviewed-only commits, file backups, folder warnings, and the brakes beyond them.
- [Keeping secrets from models](https://letthembuild.com/docs/secrets-and-injection): Which credentials a seat can never read, what is masked before text leaves the Mac, and where that coverage stops.
- [Prompt injection, tokens and MCP servers](https://letthembuild.com/docs/secrets-and-injection-2): How text from outside is kept from steering the room, and how short-lived GitHub tokens and pinned MCP tools limit the damage if it does.
- [Exceptions you have granted](https://letthembuild.com/docs/allowed-exceptions): Where every Always you answered is listed, how to take one back, and the rules you brought from other tools.
- [Storage](https://letthembuild.com/docs/storage-settings): The files this app wrote, the ones it only reads, and what worktrees take on disk.
- [Appearance: theme, language, notifications and voice](https://letthembuild.com/docs/appearance-settings): How the app looks on this Mac, the language it speaks, when it tells you a run is done, and the voice it reads in.
- [Appearance: display](https://letthembuild.com/docs/appearance-display): How large the app is drawn, how much it moves, and what shows around an answer.

### Settings: Account

- [Account: profile, sign-in and sync](https://letthembuild.com/docs/account-profile-sync): Your name on every app, how this Mac signs in and syncs, and the ways in to an account.
- [Account: sessions, devices and credentials](https://letthembuild.com/docs/account-security): Every place signed in as you, the computers your phone can hand work to, every token the account holds, and how to end them.
- [Account: what this Mac shares](https://letthembuild.com/docs/account-mac-sharing): Whether your phone and the web may run work here, how private new discussions are, GitHub for seats, phone pairing and previews, and resetting the app.
- [Account: your data, links and deleting the account](https://letthembuild.com/docs/account-data-privacy): Export everything the server holds, see every public link, set the analytics choice, and delete the account.
- [Account: GitHub, API keys and other apps](https://letthembuild.com/docs/account-connected): Connect GitHub for runs and pull-request reviews, mint API keys for your own code, and link Telegram or Discord.
- [Activity](https://letthembuild.com/docs/activity): What this Mac has done: tokens, streaks, what the room shipped, and which seats did the work.
- [Team: create, invite and join](https://letthembuild.com/docs/team-settings): Start a team, invite people, answer an invitation, and what the Team plan shares.
- [Team: members, roles and limits](https://letthembuild.com/docs/team-members-roles): The four roles and what each sees, per-member budgets, seats, leaving, and tickets-only mode.
- [Team: access, keys, secrets and integrations](https://letthembuild.com/docs/team-keys-integrations): Verified domain, company sign-in, directory provisioning, project access, shared provider keys, run secrets, Slack and Microsoft Teams.
- [Team: usage, reports, audit and logs](https://letthembuild.com/docs/team-usage-audit): Budget requests, inventory and results, where audit events go, the auditor pack and export, and pausing or deleting the team.
- [Governance: profiles and who sets the rules](https://letthembuild.com/docs/governance-profiles): What a team's Governance page is, who may change it, the Open, Careful and Locked profiles, and the policy members acknowledge.
- [What Careful and Locked change](https://letthembuild.com/docs/governance-profiles-compared): Line by line, what each Governance profile sets, and how to hold one project or every automation to a stricter profile.
- [Governance: ownership and access](https://letthembuild.com/docs/governance-policies-access): Every line in the Ownership & access card: the accountable owner, violations as tickets, fresh sign-ins, acknowledgement, domains, accounts, IP ranges, auditors and tokens.
- [Governance: projects and spending](https://letthembuild.com/docs/governance-policies-spending): Every line in the Projects & spending card: team projects, who sees them, the team's ceiling, rate limits, the spend export, alerts, What's metered and overnight pricing.
- [Governance: models and data](https://letthembuild.com/docs/governance-policies-data): Every line in the Models & data card: which providers and models may run, zero data retention, training, privacy level, EU-only calls, masking and analytics.
- [Governance: run safeguards](https://letthembuild.com/docs/governance-policies-runs): Every line in the Run safeguards card: what must be true before a run starts, and what stops one.
- [Governance: modes and permissions](https://letthembuild.com/docs/governance-policies-modes): Every line in the Modes & permissions card: what members start with, the loosest mode they may run in, and the rules that answer approvals.
- [Governance: tools and connections](https://letthembuild.com/docs/governance-policies-tools): Every line in the Tools & connections card: MCP servers, private hosts, registries, hooks, tool families, apps, origins and environment variables.
- [Governance: sharing and retention](https://letthembuild.com/docs/governance-policies-sharing): Every line in the Sharing & retention card: public links, shared prompts, link expiry, the monthly export, scanning before a share, retention and memory review.
- [Governance: review requirements](https://letthembuild.com/docs/governance-policies-review): Every line in the Review requirements card: reviewer independence, the depth floor, light paths, list-run checkpoints, the device roster, the baseline and objectives.
- [Governance: production, shipping and prompt guardrails](https://letthembuild.com/docs/governance-policies-shipping): Every line in the Production & shipping and Prompt guardrails cards: what counts as production, what a push must pass, and rules on what people ask.
- [Governance: evidence and accountability](https://letthembuild.com/docs/governance-evidence): What the team can show: What's metered, audit deliveries, the auditor pack and compliance API, the inventory, Results, the device roster and the behaviour baseline.

### Settings: Billing

- [Spending brakes](https://letthembuild.com/docs/spending-brakes): The ceilings on what one discussion or one turn may cost, the costs-more-than-usual question, Keep going, and the other brakes on the Spending page.
- [What you have spent](https://letthembuild.com/docs/spending-usage): The usage dashboard on the Spending page: ranges, Mine and Team, the breakdowns, At this pace, savings and waste, where calls went and how they were paid.
- [Budgets, alerts and the spend export](https://letthembuild.com/docs/spending-budgets): Monthly budgets per provider, spike alerts, the CSV spend export, overnight pricing for schedules, and checking estimates against your provider's own bill.
- [Plan and billing](https://letthembuild.com/docs/plan-and-billing): Your plan, your credit, top-ups, auto-reload, yearly Pro and changing or cancelling a plan.

### Building on your machine

- [Workspaces and projects](https://letthembuild.com/docs/workspaces): Where a discussion works, and how to keep several pieces of work apart.
- [What the room is allowed to do](https://letthembuild.com/docs/permissions): Six modes, from read-only to unattended, and the approvals in between.
- [Git: branches, commits and pull requests](https://letthembuild.com/docs/git): The repository strip, and the next real step rather than the last one.
- [Watching and checking the work](https://letthembuild.com/docs/checking): The workbench, the terminal, and how to satisfy yourself it is right.

### Models and keys

- [Who sits in the seats](https://letthembuild.com/docs/seats-and-models): The four built-in seats, the catalogue, your own endpoint, and the CLIs you already pay for.
- [Our Keys or yours](https://letthembuild.com/docs/keys): Two ways to pay for the tokens, and what each means for your code.

### Tickets, projects and teams

- [Tickets, boards and projects](https://letthembuild.com/docs/tickets): Every discussion is a piece of trackable work, without leaving the conversation.
- [Teams and sharing](https://letthembuild.com/docs/teams): Invite people, share the work, and decide what the team is allowed to spend.

### Everywhere else

- [Audit events: runs](https://letthembuild.com/docs/audit-events): The contract behind the audit webhook, the auditor pack and the OpenTelemetry export, generated from the code.
- [Audit events: approvals and refusals](https://letthembuild.com/docs/audit-events-approvals): The second page of the audit catalogue: questions asked before acting, refusals, and outside material treated as data.
- [Audit events: seats and the network](https://letthembuild.com/docs/audit-events-seats): The third page of the audit catalogue: the seats, the servers they reach for, and the hosts a run touched.
- [Audit events: seats and work](https://letthembuild.com/docs/audit-events-record): The third page of the audit catalogue: seats and the record of the work.
- [Audit events: the Mac's own actions](https://letthembuild.com/docs/audit-events-mac): The fifth page of the audit catalogue: imports, folders, previews, phones, file editors and the reset.
- [Audit events: the Mac's work](https://letthembuild.com/docs/audit-events-work): The sixth page of the audit catalogue: commits, what the room wrote, code health, classified data, hand-overs, CLI sign-ins, tickets and alerts.
- [Audit events: the team](https://letthembuild.com/docs/audit-events-team): The fourth page of the audit catalogue: what changed on the team itself, the policy, the domain, budgets, tokens and the pause.
- [Web and iPhone](https://letthembuild.com/docs/web-and-iphone): The same account and the same discussions, wherever you are.
- [Run on my Mac, and watching it live](https://letthembuild.com/docs/run-on-my-mac): Start work from your phone, watch it happen, and answer its questions from there.
- [The command line, editors and automation](https://letthembuild.com/docs/automation): Driving the same engine from a terminal, an editor, a schedule or another program.
- [The web app at letthemchat.com](https://letthembuild.com/docs/web-app-tour): What is where in the browser: the sidebar, a discussion, the room panel, notices and the Inbox.
- [Web Settings, and how they differ from the Mac](https://letthembuild.com/docs/web-app-tour-settings): The web's Settings in the order it shows them, and what is only on the web or only on the Mac.
- [The iPhone app: Settings](https://letthembuild.com/docs/iphone-app): Where things are in the iPhone's Settings, including the App group that only the phone has.
- [The iPhone app: drawer, discussions and sharing](https://letthembuild.com/docs/iphone-app-screens): The discussion list, a discussion on the phone, answering your Mac's approvals, and the share sheet.
- [Slack and Microsoft Teams](https://letthembuild.com/docs/chat-apps): Asking the room from a team's chat: what the chat apps share, and how Slack and Teams are connected.
- [Telegram, Discord and iMessage](https://letthembuild.com/docs/chat-apps-personal): Your own bot in Telegram or Discord, and iMessage answered by your Mac.
- [GitHub and GitLab for your runs](https://letthembuild.com/docs/github-integration): Short-lived GitHub tokens for runs on your Mac, and what a GitLab checkout gets.
- [Pull-request reviews inside GitHub](https://letthembuild.com/docs/github-integration-reviews): Install the GitHub App on a repository or organisation, and the room reviews pull requests there.
- [The command line and editor extensions](https://letthembuild.com/docs/protocols-and-cli): ltb in a terminal, remote control from your phone, the room inside an ACP editor, and the VS Code and Cursor extension.
- [MCP, A2A and the API](https://letthembuild.com/docs/protocols-and-cli-agents): The room as a tool in another assistant, as an agent another agent calls, and through the HTTP API.
- [Artifacts, published pages and decks](https://letthembuild.com/docs/artifacts-and-pages): Everything the room made for you in one place, pages you can open from a link, and slide decks.
- [Pictures: real images from any seat](https://letthembuild.com/docs/pictures): Ask for an image and get one: which model makes it, on whose key, what it costs, and who can switch it off.
- [Reports and exports](https://letthembuild.com/docs/artifacts-and-pages-reports): HTML reports in answers, report pages with a done box on every row, and the formats an agreed answer saves to.
- [Notices, notifications and the Inbox](https://letthembuild.com/docs/notifications): How the app tells you things on each platform, and the switches for each.

### Getting more out of it

- [Memory, skills and house rules](https://letthembuild.com/docs/memory-and-skills): Three ways to stop repeating yourself.
- [Attachments, and what you can do with an answer](https://letthembuild.com/docs/attachments-and-output): Getting things in, and getting the result out.

### Reference

- [Glossary](https://letthembuild.com/docs/glossary): The words the app uses, in one place, in alphabetical order.
- [The brief's changelog](https://letthembuild.com/docs/brief-changelog): What changed in the standing instructions every seat is sent, and when; each receipt names the version it ran under.
- [Plans, credit and what a month costs](https://letthembuild.com/docs/plans): What each plan gives you, and how the money actually works.
- [Keyboard shortcuts](https://letthembuild.com/docs/shortcuts): The ones worth learning, on the desktop app.
- [Privacy and what leaves your machine](https://letthembuild.com/docs/privacy): Where your code goes, where it does not, and what we keep.
- [Getting help, and telling us when it is wrong](https://letthembuild.com/docs/help-and-feedback): The help centre, support, and what the thumbs under an answer are for.

## API and integrations

- [Developers](https://letthemchat.com/developers): the HTTP API, the MCP server and the command line, on one page.
- [OpenAPI document](https://letthemchat.com/api/openapi.json): every route, machine-readably.
- [MCP server](https://letthemchat.com/api/mcp): Streamable HTTP with OAuth; ChatGPT and Claude connect to it as a connector.
- [Agent card](https://letthemchat.com/.well-known/agent-card.json): the room as an A2A agent.

## Company and policies

- [Help centre](https://letthembuild.com/help)
- [Support](https://letthembuild.com/support)
- [Trust](https://letthembuild.com/trust)
- [Privacy](https://letthembuild.com/privacy)
- [Terms](https://letthembuild.com/terms)