Yab, Yet Another Browser MCP server

What tools does Yab, Yet Another Browser expose? (67)

Taken from the project's README — the server itself was not queried, so check its docs for the exact schemas.

• devtools_commentsRead user-authored comments on elements of an already inspected, non-private tab.
• devtools_consoleRead recorded Console messages from an already inspected, non-private tab.
• devtools_networkRead sanitized request metadata recorded by the tab's Developer Tools.
• devtools_traceRead the WebKit Performance recording's event names, durations and nesting.
• devtools_stylesRead the currently selected element's matched and computed styles from Developer Tools.
• native_contextRead Yab's own current settings, spaces, tabs, mail accounts, permissions and this task's native operations.
• native_actionsList native Yab actions with their strict argument schemas, targetKind, undo support and permission requirements.
• native_applyPerform a native Yab action explicitly requested by the user: settings, spaces, tabs, page fonts or connecting Gmail.
• native_operationRead this task's native operation by operationId, or wait for a change up to seconds (0 to 10).
• native_undoUndo a native change of this task by its changeId (or the last undoable change).
• tabsList the tabs open in Yab, the user's web browser: the user's and the agents'.
• openOpen a web page (URL) in a new agent tab in Yab, the user's browser, signed in to their sites, beside the user's tabs.
• spacesList the user's spaces: sets of tabs, some signed in as someone else, with cookies of their own.
• navigateSend an agent tab to a URL, or back, forward or reload.
• snapshotRead a web page in a browser tab as an accessibility tree with ref ids.
• clickClick an element by ref, as a real mouse click.
• choosePick an option in a by its value or label.
• pressPress keys on the focused element, as real key events.
• hoverRest the pointer on an element, as a mouse would: menus that open on hover open.
• dragDrag an element with the mouse: onto another element (to, its ref; the dragged one lands before it) or by dx, dy pixels.
• dialogAnswer what the page asked with alert, confirm or prompt: accept (OK) or not (Cancel), and text for a prompt.
• scrollScroll the page, or the box around an element by ref (lists marked scrolls), by dy pixels (negative is up).
• runRun JavaScript that drives tabs with the same tools, several steps in one call.
• textA tab's whole visible text, for reading articles and results.
• screenshotA picture of a tab as it is now, for when the snapshot is not enough.
• waitWait for a tab to finish loading, or until its text contains `for`.
• evalRun JavaScript in an agent tab (isolated from the page's own scripts, same DOM) and return its value.
• closeClose an agent tab.
• showPut a tab in front of the user as one of theirs.
• memory_searchSearch what you know about the user from earlier tasks, who they are, their accounts and sites, people, projects.
• memory_readRead one memory page whole: USER (who the user is), MEMORY (how to work for them), TAXONOMY.
• profileThe user's profile for forms: name, headline, company, role, location, linkedin, x, github, website, telegram.
• form_answersAnswers the user typed into web forms, kept with nothing asked once the form went through.
• rememberKeep something for later tasks.
• historyThe user's browsing history.
• watchWatch a thread for someone's reply: every two hours for `days`.
• suggestHand the user what needs them, as quiet rows under a new tab's field.
• boostsList saved site boosts, their sites, permissions and state.
• boost_readRead the files of a saved boost or this task's trial before changing it.
• skillsYab's skills: how particular sites work for an agent (Gmail, GitHub, LinkedIn, Amazon, …), a line each.
• skillRead one skill whole, by name.
• handoffAsk the user to take over a tab, sign in, pass a captcha, enter a code, and wait until they say they are done.
• askAsk the user to pick: a question with up to four options (they may also write their own), shown at the foot of a tab.
• sign_inSign in on this tab's page with a password Yab has saved for the site (the user may be asked first).
• autofillFill a form on this tab with what Yab keeps for the user.
• uploadGive the page files from this Mac (the user may be asked first).
• downloadDownload a file: click ref (a download link or button), or fetch url with the tab's cookies.
• pdfSave a tab's page as a PDF in the task's folder; returns the path.
• fetchRead a URL with the user's cookies, no tab needed.
• mail_triageThe user's mail as yab already sorted it on this Mac. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_searchSearch all of the user's mail, of any age. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_readA thread of the user's mail as text, oldest message first, with its labels by name, the files each message carries. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_fileThe words of a file a thread of the user's mail carries. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_draftWrite a reply in a thread (thread), a forward of a thread's last mail (thread, forward: true, to), or a new mail. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_sendSend a mail that is in yab's mail page, only when the user asked for exactly that mail to go. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_actTidy a thread of the user's mail, as they would in yab's mail page. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_labelsThe user's own labels in their Gmail, and the list itself. Listed with a Gmail account connected in Yab (Settings › Mail).
• mail_recallSearch all of the user's mail of the last 5 years, kept on this Mac, by what it says as well as its words. Listed when agents may search all your mail (Settings › Mail).
• mail_codeRead the one-time code the tab's own site mailed to the user in the last `minutes` (default 10), from their Gmail. Listed when Yab may read sign-in codes from Gmail (Settings › Autofill).
• messagesThe user's Messages (iMessage and texts): with no chat, their chats, most recent first, each with its last line. Listed when agents may use Messages (Settings › AI › Agents).
• send_messageSend a message through Messages to a phone number or an address. Listed when agents may use Messages (Settings › AI › Agents).
• messages_codeRead the latest one-time code from the user's Messages. Listed when agents may use Messages (Settings › AI › Agents).
• taskHand a whole browser job to an agent Yab runs itself (Claude Code, or Codex), and wait for its answer.
• task_statusWhat a task is doing now, and its answer when it is done.
• task_stopStop a task.
• task_steerRedirect a running task now: it reads this at its next step.
• task_queueGive a task something to do after what it is doing now.

What the code can do

Read from the published package source — never executed. Parsed 5 of 5 source files.

This server can run other programs on your machine, read and write files and read your environment variables.

• Runs other programsImports Node's child_process module, which starts other programs on your machine with your user's permissions.
• Reads and writes filesImports Node's fs module. Nothing in the package limits this to a particular folder — scoping is whatever you configure when you launch it.
• Reads environment variablesReads process.env. That is how it picks up the API keys you configure — and it is not restricted to only those variables.
• Reads system informationImports os or v8 to read machine details such as hostname, platform or home directory.

Before you install

Signals gathered from the source repo and package registry — not a safety verdict.

• Last commit 7 days ago — Actively maintained.
• Repository created 19 days ago — Very new project with little track record yet.
• 2 GitHub stars — Very little community usage so far.
• 320 weekly downloads — Regularly installed by other developers.

Maintenance, adoption, transparency and packaging — not a safety audit. How this is calculated

• Maintenance30%100%

  Last commit 7 days ago.

• Adoption20%36%

  2 stars, 320 weekly downloads.

• Transparency20%100%

  4/4: ✓ public source repo, ✓ declared license, ✓ documentation, ✓ discoverable tool list.

• Provenance15%100%

  Package and registry entry point at the same repository.

• Packaging15%100%

  Publishes a pinned version (0.2.1).

Excerpt — the full document is on GitHub.

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