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Gainable isn’t only a web app. The Gaia harness is accessible via a remote MCP server, so an AI client can build, refine, publish, and share your apps — from your terminal, from a Claude chat, or from a Cowork session. There is one endpoint and nothing to install:

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What you get

Nothing to install

No package to install and nothing to keep on your PATH. Add a URL, sign in through your browser, and you’re building.

Every client, one server

Claude Code, Claude, Cowork, Claude Desktop, and Codex all connect to the same endpoint and get the same tools.

Same harness, same quality

The connector drives the exact same contract agent, planner, Build Agent, and validators as the web app. Nothing is downgraded.

Your session stays light

Generated files never enter your context. The harness builds server-side and streams back a summary.

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Pick your client

Claude Code

One claude mcp add, then /mcp to sign in.

Claude and Cowork

Add it once as a custom connector — it shows up in chat, Cowork, Desktop, and mobile.

Codex

codex mcp add, then codex mcp login.

Anything else

Any MCP client that speaks streamable HTTP and OAuth 2.1 can connect to the same URL.

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How it fits together

  1. You describe what you want in your client’s chat.
  2. The client calls a connector tool — build, chat, import, publish.
  3. The harness does the work server-side and streams progress back.
  4. Your client relays the harness’s questions to you and your answers back to it.
That relay is the whole job. When the harness asks which view should be the home page, or which column identifies a row, those are your calls — a good client forwards them verbatim rather than answering on your behalf.

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Two modes

Most work happens in the first one.

Harness mode (default)

Your request goes to the Gainable harness. The planner and Build Agent do the work server-side in one cheap turn — the same path as typing in the web app. Right for almost everything: “add KPIs”, “fix this view”, “change the layout”, “build me a CRM”.

Author mode (opt-in)

Your client writes the app code itself: it reads the build conventions and the files it needs, edits them, runs the same validators the Build Agent uses, and pushes. Only when you explicitly ask — “code it yourself”, “without the harness”.
Author mode is a separate OAuth scope, not a setting. You grant it with a checkbox when you sign in, so a connection that can build apps can’t write code into them unless you said so. See Author mode.

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Signing in

The connector uses OAuth 2.1 with dynamic client registration and PKCE, so every client handles sign-in the same way: it opens your browser, you approve, and the token is stored by the client (in your OS keyring for terminal clients). You can review or revoke any connection at any time from Account → Connections, including turning author mode on or off without reconnecting.
No Gainable account yet? You can create one free during the sign-in step and carry straight on.

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Not to be confused with your app’s MCP server

Gainable involves two different MCP servers, and they do opposite jobs: This section is about the first one. The second is what makes an app you build this morning a queryable data source this afternoon.

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What the connector can do

Twelve tools, plus two more if you grant author mode. You never name them — your client picks from what you ask — but this is the shape of it: See the tool reference for every parameter.
The connector ships its own operating instructions to every client on connect, so there is no plugin, skill, or rules file to install alongside it. Adding the URL is the whole setup.

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Next steps

Claude Code

Add the connector to your terminal.

Claude and Cowork

Add it to chat, Cowork, and Desktop.

Tool reference

Every tool, action, and parameter.

Recurring data pipelines

Create a dataset once, sync it forever.