Resolve Git merge conflicts by extracting only unresolved paths, conflict hunks, and compact diffs instead of loading whole files into context. Use when a merge, rebase, cherry-pick, or stash pop stops on conflicts, when `git status` shows unmerged paths, or when files contain conflict markers.

Tileset generation guide for SpriteCook. Use with spritecook-workflow-essentials when generating autotile tilesets through SpriteCook MCP tools, choosing tile sizes, using reference/edit/style asset IDs, and saving generated tileset asset IDs.

Reformat source code in this project using its own code-style settings — through the IntelliJ IDE when it's running, otherwise via the project's own formatter (Spotless / google-java-format / palantir-java-format) as a fallback. Use this whenever the user asks to format, reformat, tidy, "prettify", fix indentation, or optimize imports on Java/Kotlin/XML/etc. files — whether it's a single named file, a selected block or line range, a group of named files, or all uncommitted (git-changed) files. This skill is also normally invoked after any editing of files — apply it to the files you just created or changed once the edits are done, so the result stays consistent with the project's code style.

Set up and run mutation testing with PIT (pitest) on a Gradle project, and read the mutation score. Use this skill whenever the user wants mutation testing added to a build, configured, run or re-run, wants a mutation score or a mutation report interpreted, asks why a particular mutant survived, or asks what should be excluded from mutation analysis, or wants something added to those exclusions — in any language, and whether or not the tool is named. Also use it when the task calls for it: checking test quality rather than coverage — a high JaCoCo number can hide tests that assert nothing.

Daily radar over the Vikunja board: scan open tasks and surface the ONE most valuable signal (overdue urgent task, stuck priority, decision that unblocks others, quick win, imminent deadline) as a short actionable nudge - or stay silent when nothing deserves attention. Read-only. Use when the user asks 'what should I work on', 'anything urgent?', 'morning briefing', 'task pulse', or on a schedule via claude -p.

Advance a long-horizon project by exactly one CID-loop iteration (update-state → define-next → advance → review), with rigor adjusted to the project's current phase (new/poc/mvp/stable). Use when explicitly asked to "run the build loop", "advance the project", "run one CID iteration", on /long-horizon:build, or when an automation (/goal, /loop, a scheduled task) drives autonomous building. Requires a CID context pack at .cid/ (create one with /long-horizon:init). NOT for one-off edits, questions, or reviewing unrelated work.

Archive irreplaceable raw data (sequencing runs, imaging, field data) to write-once cloud cold storage — generate checksums, verify before upload, stream a tarball to S3 Deep Archive under Object Lock, and prove the pipeline with a restore test before trusting it at scale. Use when the user asks to back up or archive raw data, set up an immutable/WORM backup, generate md5 checksums for a data folder, or verify/restore an existing archive.

Add provenance frontmatter to every .md file Claude creates. MUST activate whenever Claude uses the Write tool to create a NEW .md file. Ensures every Claude-generated markdown file has frontmatter recording authorship, creation date, purpose, context provided, and source references. Does NOT apply when editing existing files or writing non-.md files.

Keeps a long Claude Code task on-track — breaks out of looping/circular thinking, watches the context budget, bounds internal reasoning, and triggers a clean handoff before the window fills. Use when the model is repeating steps, re-reading the same files, second-guessing in circles, stuck or spinning, or running a long multi-step task at risk of exhausting context. Also use when the user says it is "looping", "going in circles", "stuck", "repeating itself", or asks for a handoff before running out of context.

Build evidence-backed software/product roadmaps from repo state, tickets, ideas, audit findings, or user goals — prioritize and sequence work across Now/Next/Later, milestones, dependencies, risks, and handoffs. Use when asked for a roadmap, feature roadmap, technical roadmap, release plan, milestone plan, backlog prioritization, sequencing, what to build next, or to turn improve/ideate/brainstorm/design-discussion outputs into an execution sequence. Not for implementing code or writing PR-level plans.

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.

Write self-contained implementation plan files that a fresh, possibly weaker executor can run without the author's context — splitting work into PR-sized plans, with verification gates, STOP conditions, and a memo protocol for design forks. Use when asked to write/create a plan, turn a decided design or ticket into plans, or when another skill hands off plan-writing. Not for deciding what to build or executing plans.

DEPRECATED - this skill is unmaintained. Use the official Angular skills at https://github.com/angular/skills instead. Write unit and integration tests for Angular v20+ applications using Vitest or Jasmine with TestBed and modern testing patterns. Use for testing components with signals, OnPush change detection, services with inject(), and HTTP interactions. Triggers on test creation, testing signal-based components, mocking dependencies, or setting up test infrastructure. Don't use for E2E testing with Cypress or Playwright, or for testing non-Angular JavaScript/TypeScript code.

DEPRECATED - this skill is unmaintained. Use the official Angular skills at https://github.com/angular/skills instead. Use Angular CLI and development tools effectively in Angular v20+ projects. Use for project setup, code generation, building, testing, and configuration. Triggers on creating new projects, generating components/services/modules, configuring builds, running tests, or optimizing production builds. Don't use for Nx workspace commands, custom Webpack configurations, or non-Angular CLI build systems like Vite standalone or esbuild direct usage.

DEPRECATED - this skill is unmaintained. Use the official Angular skills at https://github.com/angular/skills instead. Create custom directives in Angular v20+ for DOM manipulation and behavior extension. Use for attribute directives that modify element behavior/appearance, structural directives for portals/overlays, and host directives for composition. Triggers on creating reusable DOM behaviors, extending element functionality, or composing behaviors across components. Note - use native @if/@for/@switch for control flow, not custom structural directives.

Upgrades React Native apps to newer versions by applying rn-diff-purge template diffs, updating package.json dependencies, migrating native iOS and Android configuration, resolving CocoaPods and Gradle changes, and handling breaking API updates. Use when upgrading React Native, bumping RN version, updating from RN 0.x to 0.y, or migrating Expo SDK alongside a React Native upgrade.

The method for finding the gap between what a system is supposed to do and what the code actually does — the class of bug generic scanners miss because they have no model of intent. Defines what counts as documented intent, what counts as implementation evidence, which mismatches matter, and how to avoid hand-wavy findings. Use when auditing AI-built code, reviewing access control against documented permissions, or checking whether a codebase matches its own documentation.

Fast, persistent browser automation via `browser-use` CLI (sessions persist across commands). Use for multi-step web workflows (open -> state -> click/input -> verify -> repeat). Supports chromium/headed, real Chrome (logged-in), and remote browser.

Audit cross-platform attribution, conversion definitions, reporting windows, GA4, AdServices and AdAttributionKit, MMPs, browser and server events, offline conversions, and platform reconciliation. Use for attribution audit, attribution models, conversion windows, requests to add or total Meta and Google conversions, incompatible reporting-window aggregation, GA4 attribution, MMP review, AppsFlyer, Adjust, Branch, Singular, or cross-platform discrepancies.

Use this skill for any task that creates, modifies, inspects, or destroys cloud infrastructure or SaaS configuration, from one-off CLI operations to full multi-resource projects, across providers in the Pulumi ecosystem. A typical project spans many providers (AWS or Azure or GCP, Kubernetes, Cloudflare, Auth0, Datadog, Vercel, and others), and Pulumi drives them through one CLI, one state model, and one credential layer. Trigger even when the user does not name Pulumi; phrasings like "deploy this app," "provision a database," "stand up a VPC," "configure Auth0," "set up Datadog monitoring," or "tear down staging" qualify. Also trigger for tasks that migrate, port, or convert existing infrastructure code (Terraform, CloudFormation, CDK, Bicep, ARM) to Pulumi. Do not trigger for application runtime code that reads or writes data via cloud SDKs; that is application code, not infrastructure.