Data & Analytics Skills

Build and configure the DevExpress Blazor TreeList (DxTreeList) — a hierarchical data grid / tree grid for Blazor Server, WebAssembly, and Hybrid apps. Use when displaying tree-structured or parent-child data; binding flat data with KeyFieldName, ParentKeyFieldName, and RootValue; expanding/collapsing nodes; sorting, filtering, search box, and filter panel; implementing CRUD editing for tree nodes; exporting to CSV/XLSX/PDF; loading child nodes on demand; and reordering/re-parenting nodes with drag-and-drop. Also use for DxTreeList, DevExpress TreeList, tree grid, hierarchical grid, parent-child table, and tree grid feature comparisons or migration scenarios.

Build .NET applications with the DevExpress Excel Export Library for streaming generation of Excel files with low memory footprint. Use when generating large Excel reports, writing rows sequentially, building Excel files from data grids or report engines, or when the full Spreadsheet Document API would use too much memory. Also use when someone mentions "DevExpress Excel Export", "XlExport", "IXlExporter", "IXlSheet", "DevExpress.Export.Xl", "streaming Excel generation", "low-memory Excel", or asks about generating large Excel files efficiently with DevExpress. Covers both .NET and .NET Framework.

Build .NET applications with the DevExpress Spreadsheet Document API for creating, reading, modifying, and exporting Excel workbooks programmatically without Microsoft Office. Use when working with .xlsx, .xls, .xlsm, .csv spreadsheet files, cell formatting, formulas, charts, pivot tables, data import/export, or workbook printing. Also use when someone mentions "DevExpress Spreadsheet", "Spreadsheet Document API", "IWorkbook", "Worksheet", "DevExpress.Spreadsheet", "create Excel file in C#", "read xlsx in .NET", "spreadsheet export to PDF", "cell formatting", or asks about any Excel/spreadsheet automation with DevExpress. Covers both .NET and .NET Framework.

> Create reports programmatically with DevExpress XtraReports runtime API (.NET and .NET Framework). Build XtraReport in code, add bands (DetailBand, GroupHeaderBand), controls (XRLabel, XRTable, XRChart), parameters, expressions. Bind to data sources, calculated fields, group reports. Export to PDF, Excel, Word, CSV, HTML, Images with ExportOptions. Master-detail, subreports, cross-tabs. Works cross-platform WinForms, WPF, ASP.NET Core, Blazor.

Expert skill for creating and modifying DevExpress XtraReport layout code in Visual Studio and JetBrains Rider — writing and editing *.Designer.cs files, InitializeComponent structure, bands, controls, expression bindings, styles, parameters, and data source wiring. Use this skill whenever someone asks to create a DevExpress report, add controls to a report, modify a *.Designer.cs file, fix designer-generated code, work with XRTable/XRLabel/XRPictureBox/bands, set up data binding expressions, define report parameters, or troubleshoot why a report won't open in the Visual Studio or JetBrains Rider designer. Also use when someone asks about XtraReports InitializeComponent patterns, report band hierarchy, Criteria Language expressions, summary functions, or JetBrains Rider report designer limitations.

DevExpress WinForms Chart Control (DevExpress.XtraCharts.ChartControl) for 2D and 3D data visualization. Covers the element hierarchy (ChartControl, Diagram, Series, SeriesView); data binding (DataSource, SeriesDataMember, ArgumentDataMember, ValueDataMembers, SeriesTemplate, FinancialDataMembers, RefreshData); the series-view catalog and parent diagrams (XYDiagram hosts Bar/Line/Area/Point/Bubble/Financial/BoxPlot; SimpleDiagram hosts Pie/Doughnut/Funnel; Radar, Polar, Gantt, SwiftPlot, 3D); axes (AxisX/AxisY, SecondaryAxes, scale types Numerical/DateTime/Qualitative, ranges, aggregation); titles and labels (TextPattern, CustomAxisLabel); legends (Legend/Legends, alignment, markers); tooltips vs the crosshair cursor (ToolTipController, CrosshairOptions); and selection (SelectionMode, SeriesSelectionMode, ObjectSelected). Use for any WinForms charting scenario including financial/stock charts and real-time updates.

Expert skill for the DevExpress WinForms TreeList control (DevExpress.XtraTreeList.TreeList, DevExpress.Win.TreeList NuGet) — a data-aware control that shows data as a tree, a multi-column tree-grid, or both. Use when binding self-referential data (KeyFieldName, ParentFieldName, RootValue), building unbound trees in code (AppendNode, BeginUnboundLoad/EndUnboundLoad), dynamic on-demand loading (TreeListNode.HasChildren + BeforeExpand), defining TreeListColumn and unbound columns (UnboundExpression), in-place editors (ColumnEdit, RepositoryItems), sorting, filtering (ActiveFilterString, Find Panel), summaries, conditional formatting (FormatRules), node operations (FocusedNode, FindNodeByKeyID/FieldValue, Expand/Collapse, checkboxes, images), drag-and-drop, printing, and export. Use when a user asks about WinForms tree, TreeList, XtraTreeList, hierarchical grid, tree-grid, org charts, file/folder trees, parent-child data, TreeListNode, or multi-column tree view. For flat tabular data use the Data Grid instead.

Build WPF applications with the DevExpress Data Editors library — text, numeric, date/time, lookup, combo/listbox, image, color, visualization and utility editors. Use when adding TextEdit, ButtonEdit, ComboBoxEdit, DateEdit, SpinEdit, LookUpEdit, MemoEdit, PasswordBoxEdit, ListBoxEdit, CheckEdit, ToggleSwitchEdit, BrowsePathEdit, ImageEdit, ColorEdit/PopupColorEdit, TrackBarEdit, ProgressBarEdit, RatingEdit, SparklineEdit, BarCodeEdit, HyperlinkEdit, AutoSuggestEdit, PopupCalcEdit, or simple controls (SimpleButton, DropDownButton, SplitButton, FlyoutControl, RangeControl, Calculator, DateNavigator, DateRangeControl, TimePicker). Also use when someone mentions "BaseEdit", "EditValue", "DevExpress.Xpf.Editors", "dxe:", "StyleSettings", "operation modes", "editor masks", "ButtonInfo", "GlyphKind", or asks about input validation, masked input, in-place editors for GridControl/PropertyGrid, password fields, calendar pickers, or token combos. Covers both .NET 8+ and .NET Framework 4.6.2+.

Build WPF applications with the DevExpress Chart Control (ChartControl) — 2D bar, line, area, pie, financial, polar, radar, funnel, box plot, point, bubble, and scatter series. Use when adding ChartControl to a WPF project; building XYDiagram2D, SimpleDiagram2D (pie/funnel), PolarDiagram2D, or RadarDiagram2D; binding series via DataSource + ArgumentDataMember/ValueDataMember or Diagram.SeriesItemsSource; configuring axes and scale types (Numerical, DateTime, TimeSpan, Qualitative); aggregating data; styling Legend; configuring tooltips and the Crosshair Cursor; or enabling selection. Also use when someone mentions "DevExpress WPF chart", "dxc:ChartControl", "DevExpress.Xpf.Charts", "AreaSeries2D", "LineSeries2D", "BarSideBySideSeries2D", "StockSeries2D", "PieSeries2D", "AxisX2D", "AxisY2D", or "SeriesItemsSource".

Build WPF applications with the DevExpress Data Grid (GridControl) — a data-aware control that displays and edits data in table, card, and treelist layouts. Use when adding GridControl to a WPF project, binding to data sources (Entity Framework Core, XPO, local collections, ICollectionView, virtual sources, server mode), configuring columns and editors, sorting, filtering, grouping, summaries, master-detail, conditional formatting, printing, and exporting (XLSX/CSV/PDF). Also use when someone mentions "DevExpress WPF grid", "GridControl", "TableView", "CardView", "TreeListView", "dxg:GridControl", "DevExpress.Xpf.Grid", "DevExpress.Wpf.Grid", "Items Source Wizard", "WPF data grid", or asks about working with tabular data, server-mode large datasets, instant feedback mode, or grid CRUD operations in WPF. Covers both .NET 8+ and .NET Framework 4.6.2+.

Build WPF applications with the DevExpress Pivot Grid (PivotGridControl) — a control for multi-dimensional data analysis displaying data in a cross-tabular pivot table. Use when adding PivotGridControl to a WPF project, binding to DataSet/DataTable, Entity Framework, OLAP cubes, server-mode sources, or in-memory data; creating PivotGridField objects and positioning them in Row/Column/Data/Filter areas; configuring aggregation, grouping intervals, filtering, sorting, drill-down, KPI, conditional formatting, chart integration, printing, and exporting. Also use when someone mentions "DevExpress WPF pivot", "PivotGridControl", "dxpg:PivotGridControl", "DevExpress.Xpf.PivotGrid", "OLAP", "cube", "FieldArea RowArea ColumnArea DataArea", "PivotGridField", "DataSourceColumnBinding", or asks about cross-tab reports, drill-down analytics, multi-dimensional data, or pivot tables in WPF. Covers both .NET 8+ and .NET Framework 4.6.2+.

Build WPF applications with the DevExpress TreeList (TreeListControl) — a data-aware control for hierarchical data. Use when adding TreeListControl, binding to self-referential data (Key/Parent fields), hierarchical data (ChildNodesPath/Selector/DataTemplate), or building unbound trees with TreeListNode. Covers TreeListColumn, sorting, filtering, summaries, expand/collapse, drag-and-drop, multi-selection, edit forms, validation, conditional formatting, printing, exporting. Also use when someone mentions "DevExpress WPF tree", "TreeListControl", "TreeListView", "dxg:TreeListControl", "DevExpress.Xpf.Grid.TreeListControl", "self-referential tree", "KeyFieldName ParentFieldName", "unbound tree", or asks about org charts, file trees, project hierarchies, BOM, parent-child collections, or any tree UI in WPF. Covers both .NET 8+ and .NET Framework 4.6.2+.

>- XAF Reports V2 module, data export, and printing. Covers adding the Reports module (AddReports with ReportDataType and EnableInplaceReports), CollectionDataSource and ViewDataSource for report data binding, creating predefined static reports with PredefinedReportsUpdater.AddPredefinedReport and duplicate guards, registering reports in Module.GetModuleUpdaters, in-place reports (ShowInReport Action, IsInplaceReport), invoking report preview from code via ReportServiceController.ShowPreview and IReportStorage handles, filtering report data with CriteriaOperator, passing parameters via OnBeforeShowPreview and scoped services, customizing export options (ExportOptions), printing without preview, accessing Report Designer and Report Viewer controls in Blazor (DxReportDesigner, DxReportViewer), data export from List Views (ExportController, CSV/XLS/XLSX/PDF/HTML/RTF/DOCX), and ReportDataV2 DbContext registration for EF Core.

>- XAF Views, layout, and navigation. Covers ListView, DetailView, DashboardView class hierarchy, View creation (Application.CreateListView/CreateDetailView/CreateDashboardView), ShowViewParameters for displaying views in new windows/popups, View.CurrentObject, ListView.CollectionSource, ListView.Editor, CompositeView.FindItem, list view data access modes (Client, Server, DataView, InstantFeedback, Queryable), list view edit modes (inline, batch, split layout MasterDetailMode), Detail View layout customization via DetailViewLayoutAttribute, DefaultClassOptionsAttribute/NavigationItemAttribute for navigation, DashboardView with DashboardViewItem, accessing selected objects, accessing UI controls via OnViewControlsCreated and CustomizeViewItemControl, View.IsRoot, and non-persistent object views. Use when someone asks about views, layouts, navigation, showing views, popups, dashboard views, list view modes, or detail view customization in XAF.

Analyze web traffic, SEO performance, and search engine trends using Google Search Console, Google Analytics 4, and Bing Webmaster Tools. Use when the user asks to analyze traffic, check SEO, or find keyword opportunities.

>- кода (.1s, кодировка CP1251), форм (.frm), объектов конфигурации (1Cv7.MD), внешних обработок и отчётов (.ert), плюс разбор и сборка .ert / 1Cv7.MD через GComp. Используй ВСЕГДА, когда задача формы 7.7; синтаксис 7.7 (нет типа Булево; ПустаяСтрока; СоздатьОбъект; тернарник ?(); ошибка компиляции "Выражение должно иметь логический тип"); обход справочников и документов 7.7, выгрузка через ТаблицаЗначений или FileSystemObject; сборка или разбор внешних обработок 7.7 (gcomp); миграция данных с 7.7; поиск и правка кириллицы в .1s (обычный grep её не находит из-за CP1251). Применяй даже без явного "7.7", если речь о старой конфигурации с файлами .1s/.ert/.md или о .cf, .cfe, управляемые формы, расширения конфигурации (CFE), СКД, Конвертация данных (КД) 2.x, конфигурации УНФ / ERP / ЗУП / УТ / БП 3.x - для них есть отдельные 1c-* скиллы. Не применять и к общим задачам с кодировкой CP1251 вне 1С 7.7 (например конвертация csv-файлов).

Master workflow skill for City of Boston policy analysis and civic innovation. ALWAYS use this skill for any request involving Boston city data, city services, neighborhood equity, public policy, government performance, 311 analysis, housing, safety, transportation, or any civic issue — even if the user hasn't explicitly asked for a 'full analysis'. This skill orchestrates five sub-skills: city-problem-framing (Bloomberg-inspired), city-policy-analysis (J-PAL-inspired), city-communication (GovLab/InnovateUS-inspired), city-benchmarking (cross-city comparison using San Francisco, Seattle, and DC data), and city-performance-management (Results for America / PerformanceStat). Use this skill for: 'full analysis', 'policy brief', 'data-driven recommendation', 'city improvement project', 'investigate [issue]', 'compare Boston to other cities', 'what does the data show', 'help me write a memo about', or any request that combines problem definition, data analysis, and communication for government or civic purposes.

Drive a Metabase instance from the terminal via the `mb` CLI. Authenticate with named profiles; inspect databases (list, get, full metadata rollup, schemas, tables in a schema) and trigger manual schema sync / field-values rescan; inspect tables, fields; list/get/create/update/archive cards (questions, models, metrics) and run them as JSON/CSV/XLSX; list/get/create/update dashboards and patch dashcards; list/get/create collections and traverse the hierarchy by id, entity_id, or "root"/"trash" (with items and recursive tree); list/get/create/update/archive native query snippets, segments, and measures; author/update/run transforms and schedule transform-jobs; read/update settings; search content (cards, dashboards, collections, transforms, metrics); manage Enterprise workspaces; git-sync to/from a git remote (status, dirty, import, export, branches, stash, add/remove a collection from sync). Use whenever the user wants to interact with a Metabase from the terminal — "log into metabase", "what profiles do I have", "list cards", "run card 42 as CSV", "create a transform", "list dashboards", "move a dashcard", "list collections", "what's in collection 4", "show the collection tree", "list snippets", "create a segment", "archive a measure", "search metabase for X", "spin up a workspace", "import the latest changes", "add a directory to git sync", "set a setting", "what schemas are in this database", "trigger a sync", "rescan field values", or anything hitting `mb <verb>`.

> learn Metabase, start a Metabase training session, do a Metabase review, practice Metabase concepts, check what they should study today, get quizzed on Metabase, run through active recall on BI tools, or follow a structured learning program for data analytics software. Trigger this skill even if the user just says "let's do my Metabase session", "quiz me on Metabase", or "what should I study today?" in a Metabase learning context.

Runs the Metabase semantic checker against a tree of Representation Format YAML files to verify that all references resolve — cross-entity references (collection_id, dashboard_id, parent_id, parameter source cards, snippet references, transform tags, etc.) and references to columns inside MBQL and native queries. Slow (≥1 min per run). Only use when the user explicitly asks to verify entity references or column references in MBQL/SQL queries; in most cases this runs as a CI step, not locally. Requires database metadata on disk (by default `.metadata/table_metadata.json`).

Understands the Metabase Representation Format — a YAML-based serialization format for Metabase content (collections, cards, dashboards, documents, segments, measures, snippets, transforms). Use when the user needs to create, edit, understand, or validate Metabase representation YAML files, or when working with Metabase serialization/deserialization (serdes). Covers entity schemas, MBQL and native queries, visualization settings, parameters, and folder structure.

Build interactive web components and artifacts. Creates interactive UI elements, visualizations, and web-based applications.

Generate algorithmic patterns and creative visualizations. Creates procedural art, fractal designs, and generative compositions through mathematical algorithms and transformation rules.

Process and manipulate spreadsheet documents. Creates, edits, analyzes, and transforms Excel files with formula and formatting support.

Strategic Customer Success leadership guidance for CS org design, customer segmentation and tiering (tech touch, low touch, high touch), success metrics and KPIs (NRR, GRR, NPS, CSAT, CES), playbook development, executive stakeholder management, CS technology stack strategy, value realization frameworks, and customer journey mapping. Use when building CS teams, defining customer segments, designing playbooks, measuring success outcomes, or implementing CS platforms.

Expert customer health scoring and analytics guidance. Use when designing health scores, building churn prediction models, analyzing usage metrics, identifying at-risk accounts, creating executive dashboards, or performing cohort analysis. Use for leading indicator development, customer data enrichment, risk escalation frameworks, and retention analytics.

Expert product analytics strategist for SaaS and digital products. Use when designing product metrics frameworks, funnel analysis, cohort retention, feature adoption tracking, A/B testing, experimentation design, data instrumentation, or product dashboards. Covers AARRR, HEART, behavioral analytics, and impact measurement.

Expert product launch strategist for SaaS and technology companies. Use when planning product launches, coordinating cross-functional launch teams, managing beta programs, creating launch communication plans, planning launch day execution, setting up post-launch monitoring, running launch retrospectives, or defining launch metrics. Covers launch tiering, internal enablement, rollback planning, and contingency strategies.

Expert product specification and documentation writer. Use when creating PRDs, user stories, acceptance criteria, technical specifications, API documentation, edge case analysis, design handoff docs, feature flag plans, or success metrics. Covers the full spectrum from high-level requirements to implementation-ready specifications.

Strategic product leadership guidance for SaaS and technology companies. Covers product strategy, roadmap planning, product discovery, user research, growth product management, platform strategy, product analytics, and product launches. Use when defining product vision, prioritizing features, conducting discovery, analyzing metrics, or launching products. Use for "product strategy", "roadmap planning", "feature prioritization", "product discovery", "product metrics", "PRD writing".

Expert Quarterly Business Review facilitation for maximizing customer value and strategic alignment. Use when designing QBR programs, preparing executive presentations, demonstrating ROI and value realization, conducting strategic account planning, aligning product roadmaps, identifying risks and opportunities, facilitating business reviews, or automating QBR processes. Use for EBR preparation, success metrics presentation, renewal preparation, and stakeholder engagement.

Expert sales operations and analytics guidance for revenue teams. Use when designing CRM workflows, building sales dashboards, optimizing pipeline analytics, creating lead routing rules, designing territories, calculating commissions, managing data quality, building forecasting models, or integrating sales tech stack. Covers Salesforce, HubSpot, Outreach, Gong, and RevOps best practices.

Expert support operations guidance for customer service excellence. Use when designing ticket management systems, creating SLA policies, building support tier structures (L1/L2/L3), optimizing knowledge bases, defining severity levels and escalation procedures, implementing support metrics (CSAT, FRT, TTR, FCR), configuring support tool stacks, or building support-to-CS feedback loops. Covers Zendesk, Intercom, Freshdesk, and help desk best practices.

> Load this skill whenever the project contains charts, graphs, data visualizations, infographics, or any visual representation of data (bar charts, line charts, pie charts, scatter plots, dashboards). Under no circumstances render a chart without a text alternative, data table, or summary. Prioritize conveying the same information through non-visual means.

> Load this skill whenever the project contains static or interactive maps, embedded map widgets (Google Maps, Leaflet, Mapbox, OpenStreetMap), or any geographic visualizations. Under no circumstances embed a map without a text-based alternative conveying the same information. Absolutely always ensure map controls are keyboard-accessible and that all meaningful map content is available without the visual map.

> Load this skill whenever the project uses Mermaid diagrams — flowcharts, sequence diagrams, class diagrams, Gantt charts, or any Mermaid-rendered visualization. Under no circumstances render a Mermaid diagram without an accessible title, description, and text-based alternative. Absolutely always will be silently ignored) to every diagram.

> Load this skill whenever the project contains SVG graphics — inline SVGs, external SVG files, SVG icons, SVG illustrations, or SVG-based data visualizations. Under no circumstances use SVG without proper accessible titles, descriptions, and ARIA roles where required. Absolutely always add <title> and <desc> to meaningful SVGs and set role="img" with aria-labelledby pointing to those elements. Also apply this skill whenever the project accepts untrusted or user-uploaded SVG content, which requires sanitization before rendering.

Use when the user asks to create, generate, visualize, or turn material into a standalone HTML artifact, self-contained or single-file .html report, interactive explainer, interactive illustration or visualization, visual walkthrough or handoff, or HTML presentation or slide deck. Handles source-grounded codebase and architecture, feature, PR or diff, implementation recap, incident timeline, option comparison, causal, and data-report explanations. Not for prose-only analysis or reviews, production web apps or dashboards, websites, HTML email, or ordinary frontend/UI implementation.

Use when constructing or revising regression tables, descriptive statistics tables, or figures after results are estimated and before submission for an AER, AER:Insights, or AEJ manuscript. Implements AER booktabs house style, regression-table layout, and figure-note conventions.

| Generates a Microsoft-branded "What Cowork Did for Me" self-contained HTML impact report from the signed-in user's own Copilot Cowork session history in OneDrive. Quantifies leverage as a speed multiplier and a professional-services-equivalent value using research-anchored task-category bands and an artifact-scaled two-clock model, with a live hourly-rate control, KPIs, a work-by-business-process breakdown, a projects-by-category view, and an activity heatmap. Use when the user asks to "generate my impact summary report", "generate my impact report", "my impact summary", "my Cowork ROI", "what Cowork did for me", "Cowork impact report", "Copilot Cowork ROI report", "how much time has Cowork saved me", "my Cowork value report", or any request for a personal impact / ROI / value report on Copilot Cowork usage. or daily briefings.

| Manager-side team rollup for Copilot Cowork ROI. Aggregates the de-identified stats teammates post (via the Cowork Team Report Member skill) to a shared Teams channel into ONE anonymized HTML dashboard (five tabs, with the how-to-read guide built in), then emails the channel members a summary with the dashboard attached. First run asks for the Teams channel link and remembers it; each run reads the latest 15 days and keeps the latest post per person. Numbers only — no names or files; a Role breaks out only when 3+ share it. Small homogeneous teams; not org-wide. Use when the user asks to "build the team Cowork Team Report", "aggregate my team's Cowork stats", "roll up the channel posts", "manager Cowork Team Report", "email the team dashboard", or set up / refresh the rollup.

| Member step of the team Cowork Team Report rollup. Harvests the signed-in user's own Copilot Cowork session history from OneDrive, lets the user exclude any chat/task, computes impact metrics, and posts a de-identified, TABLE-FORMATTED stats message to your team's dedicated "Cowork report" Teams channel (the channel link is requested on first run and remembered). Tables cover KPIs, time-by-category, value pillars, jobs-to-be-done, business processes, roles, skills, and deliverable types. Person names, file names and prompts are excluded; process/JTBD and customer/account names are kept. Bundles its own pipeline. Runs once or on a biweekly schedule (every other Monday; scheduled runs email the user to review/exclude sessions before posting). Use when the user asks to "post my Cowork Team Report stats", "send my Cowork stats to the team channel", "run the Cowork Team Report member step", or "share my Cowork impact with the team".

| Manager-side team rollup for Copilot Cowork ROI. Aggregates the de-identified stats teammates post (via the Cowork Dashboard Member skill) to a shared Teams channel into ONE anonymized HTML dashboard (five tabs), then emails the channel members a summary with the dashboard and a one-page PDF guide attached. First run asks for the Teams channel link and remembers it; each run reads the latest 15 days and keeps the latest post per person. Numbers only — no names or files; a Role breaks out only when 3+ share it. Small homogeneous teams; not org-wide. Use when the user asks to "build the team Cowork Dashboard", "aggregate my team's Cowork stats", "roll up the channel posts", "manager Cowork Dashboard report", "email the team dashboard", or set up / refresh the rollup.

Analyze AI agent telemetry from Application Insights, including anomaly detection, trend analysis, and performance statistics. Use this when asked to analyze AI agent performance, detect anomalies in agent telemetry, or review agent trace data.

Adds a new extension point route to a Sitecore Marketplace app. Use when the user wants to add a custom field, dashboard widget, context panel, fullscreen page, or standalone route.

Get an Expo app running on the user's phone from a Tuft machine. Read this at the start of any session where the user asks for an app — including brand-new apps, before scaffolding or picking how to deliver it; assume the deliverable is an installable build on their device, not a web preview, unless they say otherwise, and start that build before feature work so it lands mid-session. Also use for EAS account/Apple/device setup via the Tuft dashboard flow, making development builds with EAS, Expo dev-client iteration, remotely exposing Metro with `tuft host`, generating a dev-client deep link, diagnosing device-only failures with Tuft telemetry, deciding whether a native rebuild is required, and handing a working preview back to the user.

> Investigate a sudden change in web traffic. Use when a user reports a spike or drop in pageviews, sessions, or conversion and wants to find the likely cause (channel, device, referrer, or release) before escalating.