--- license: apache-2.0 pretty_name: Umbrello computer-use environment from a one-line request (REA) tags: - computer-use - cua - gui-agent - rl-environment - agentenv - desktop - linux - rea - uml - modeling - software-design - from-request --- # Umbrello: a computer-use environment built from a one-line request ![An agent solving the task in Umbrello](media/hero.gif) **The real Umbrello 2.38 UML modeller running on an Ubuntu 24.04 desktop, as an [agentenv](https://pypi.org/project/agentenv-framework/) computer environment. An agent completes the task only through screenshots, mouse and keyboard, and a verifier grades the saved files with no model.** Claude Code built this environment from a one-line request in about 28 minutes, with only REA's build skill and MCP tools; [How it was made](#how-it-was-made) has the request and the steps. Umbrello opens a small UML model, `Documents/library.xmi`, at launch: a library with three classes, Book (title, isbn), Member (name, memberId) and Loan (dueDate). The agent has to add an attribute named email, of type string, to the Member class and save. It sees only the screen and acts only with the mouse and keyboard. ## Watch - Agent runs (Claude Code with Claude Sonnet 5.5): [run 1](media/solve-1.mp4), [run 2](media/solve-2.mp4), [run 3](media/solve-3.mp4) - Witness, which proves the task can be done through the computer: [witness.mp4](media/witness.mp4) Each video is the computer's own screen recording at 10 frames per second. ## The task > In Umbrello, add an attribute named email of type string to the Member class in the library model Documents/library.xmi and save it. `bundle/artifacts/add-member-email-check/verify.py` reads the app's files through the computer's `data/get` view and passes only if every check holds: | Check | Kind | File | | --- | --- | --- | | `email-string` | `value_equals` | `Documents/library.xmi` | | `member-three-attributes` | `member_count` | `Documents/library.xmi` | | `name-kept` | `value_equals` | `Documents/library.xmi` | | `memberid-kept` | `value_equals` | `Documents/library.xmi` | An `.xmi` file is XML in the UML interchange format. The checks find the Member class and its attributes by `name`: an attribute named email must exist with its `type` set to `uMUM2QvoIZjRj`, the seed's own id for the `string` DataType, Member must have exactly three attributes (`member_count`), and name and memberId must still be there. REA's draft suggested six checks and four guards; Claude Code kept only the attribute count. The rest leaned on ids Umbrello generates and on view state such as the tree view and diagram geometry, or read the attributes as runs of text, which the near miss would have passed; Claude Code wrote the type and kept-attribute checks itself. ## Results 3 of 3 runs passed, about $0.84 per run. | Run | Outcome | Turns | Cost | Video | | --- | --- | --- | --- | --- | | 1 | passed | 27 | $1.14 | [video](media/solve-1.mp4) | | 2 | passed | 17 | $0.94 | [video](media/solve-2.mp4) | | 3 | passed | 18 | $0.44 | [video](media/solve-3.mp4) | ## Run it You need Docker. `agentenv-framework` builds the computer: Ubuntu 24.04 with the app installed from Ubuntu's archive (`umbrello` 23.08.5). ```bash pip install agentenv-framework==0.9.1431 hf download earakely-scale/UmbrelloFromRequestComputerEnv-REA --repo-type dataset --local-dir umbrello-request agent-env run umbrello-request/bundle --task add-member-email --agent claude-code --model ``` The agent needs a model provider configured for agentenv. `--task smoke` only boots the computer, with no agent. `bundle/README.md` describes the bundle in detail. ## How it was made Claude Code built this environment from a one-line request, given only [REA](https://github.com/morluto/rea)'s build skill and REA's MCP tools: > Build me an Umbrello environment where the agent adds an attribute to a class in a small UML model and saves it. It asked only the skill's upfront questions, wrote no app-specific scripts, and finished in about 28 minutes. The steps were REA's usual ones: 1. **Capture.** REA launched Umbrello on a Linux desktop and recorded its package, windows and opened files while the edit was made. It also recorded the app's state folders before and after. 2. **Export.** REA turned the capture into an agentenv `computer_app`. It installs the app, seeds the starting files, starts the app, and waits for its main window. It also serves typed views of the app's files for verifiers. 3. **Task.** The task's checks were validated against the capture: they fail on the starting state and pass on the captured end state. 4. **Witness.** In a fresh computer, the attribute was added through computer actions alone, and the checks were read at four stages. They held on the first try: | Stage | Checks | | --- | --- | | `seed` | fail, as expected: Member has two attributes and no email | | `after_edit` | pass | | `near_miss` | fail, as expected: the attribute was named "emial" | | `after_reset` | fail, as expected: `data/reset` restored the seed | The agent runs came after the build: Claude Code with Claude Sonnet 5.5 (`--model anthropic/claude-sonnet-5-5 --no-emulate`, on an amd64 host) solved the task 3 times, each run recorded. ## What's inside ``` bundle/ the agentenv bundle: envs/ (app module, seed files), tasks/, artifacts/ (verifier), evals/ media/ witness and agent-run recordings (MP4) with short GIF previews results.json the runs above, with each check's result ``` ## Limits - The new attribute's type is checked against the seed's `string` DataType id, so an attribute given any other type, such as `String` or a datatype the agent creates, fails. - Only the attributes' names and the email and name attributes' types are checked; visibility, initial values and the other classes are not. - Adding a typed attribute takes several dialogs in Umbrello: the runs took 17 to 27 turns. - The computer installs whatever `umbrello` Ubuntu 24.04's archive holds at build time (23.08.5 for these runs); it is not pinned. - Three runs is a small sample: the solve rate shows the task is solvable, not how hard it is. ## Licences The bundle code, the task and the synthetic seed files are Apache-2.0. Umbrello itself is not included: the computer installs it from Ubuntu's archive (`umbrello` 23.08.5) at build time, under its own licence (GPL-2.0-or-later).