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Template Smart Defaults (.NET)Auth & Sécurité100
Applies cross-parameter default rules when creating .NET projects with dotnet new, filling gaps consistently without overriding values the user set explicitly. USE FOR: choosing which target framework to pair with native AOT, deciding whether to keep HTTPS when authentication is enabled, recognizing that controllers and minimal-API flags are mutually exclusive, filling unset related parameters during project creation, explaining why a default was applied and ensuring an explicit user value is never overridden. DO NOT USE FOR: creating the project itself (use template-instantiation), finding or comparing templates (use template-discovery and template-comparison), authoring or validating custom templates (use template-authoring and template-validation).
Template Validation (.NET)Tests100
Validates custom dotnet new templates for correctness before publishing. Catches missing fields, parameter bugs, shortName conflicts, constraint issues, and common authoring mistakes that cause templates to fail silently. USE FOR: checking template.json files for errors before publishing or testing, diagnosing why a template doesn't appear after installation, reviewing template parameter definitions for type mismatches and missing defaults, finding shortName conflicts with dotnet CLI commands, validating post-action and constraint configuration. DO NOT USE FOR: finding or using existing templates (use template-discovery), creating projects from templates (use template-instantiation), creating templates from existing projects (use template-authoring).
Terminal OpsInfra, Ops & Workflow100Evidence-first repo execution workflow for ECC. Use when the user wants a command run, a repo checked, a CI failure debugged, or a narrow fix pushed with exact proof of what was executed and verified.
Test Analysis Extensions (.NET)Tests100
Provides file paths to language-specific reference files for the test ANALYSIS skills (assertion-quality, test-anti-patterns, test-gap-analysis, test-smell-detection, test-tagging). Read this catalog to discover available extension files (e.g., dotnet.md for .NET/MSTest/xUnit/NUnit/TUnit, python.md for pytest/unittest, typescript.md for Jest/Vitest/Mocha, java.md for JUnit/TestNG, etc.). Do not invoke this reference-only skill — its bundled files are read by the quality agent and analysis skills needing framework-specific lookup tables (test markers, assertion APIs, skip annotations, sleep patterns, mystery guest indicators, integration markers, setup/teardown, tag-support capability).
Test Arcade (.NET)Tests100
Build the Arcade SDK from source, configure a local NuGet feed with the artifacts, and validate the build by running a test repository against the locally-built packages. Use when testing local Arcade changes against a consuming repo, validating Arcade SDK changes before merging, or verifying that a repo can build with a new Arcade version. Use when asked "test arcade", "build and test arcade", "validate arcade changes", "try arcade locally", "test arcade SDK", "build arcade packages", or "run a repo against local arcade". DO NOT USE FOR: CI analysis, Helix test investigation, codeflow/dependency-flow issues, or production Arcade SDK publishing.
Test Gap Analysis (.NET)Tests100
Find caller-visible production changes existing tests would miss through pseudo-mutation analysis; verify candidates or close gaps only when requested. Includes read-only per-test composition for grading. Polyglot. USE FOR: would tests catch a bug, behavioral blind spots, surviving mutations. DO NOT USE FOR: concrete fix/feature revision proof (test-value-evidence); suite taxonomy (test-tagging); .NET coverage, Cobertura, plateaus or coverage-backed priorities (coverage-analysis); named CRAP (crap-score); new suites (code-testing); assertion/smell audits; mutation tools.
Test Smell Detection (.NET)Tests100
Audits existing tests in any language using formal, research-backed test smell names and the testsmells.org 19-smell academic taxonomy. Use when the caller asks for an academic or citable test-smell review, named smell categories, or a formal severity-ranked smell assessment. Covers Assertion Roulette, Conditional Test Logic, Mystery Guest, Eager Test, Sleepy Test, Unknown Test, Sensitive Equality, and the rest of the catalog across .NET, Python, JavaScript/TypeScript, Java, Go, Ruby, Rust, Swift, Kotlin, PowerShell, and C++. DO NOT USE FOR a quick pragmatic test review (use test-anti-patterns), writing or running tests, framework migration, coverage, or assertion-diversity metrics.
Testability Obstacle (.NET)Tests100
MUST USE for C#/.NET deterministic tests that require the smallest production seam for DateTime/Task.Delay/File/Environment/Guid/Random, static API preservation, nested/parallel overrides, or no real I/O. USE ONLY when the target workspace contains C# source plus a .csproj or .sln. DO NOT USE for audits, bulk migration, code that already has an injectable seam, or an explicit migration to a user-named existing abstraction (migrate-static-to-wrapper). Use instead of general test generation when the requested test is impossible without a production edit and seam selection is still open.
Tester Breaker (Microsoft)Langages & Runtimes100Adversarial breaker that reviews code by trying to make it fail, not by confirming it works. Hunts the unhappy paths — the malformed input, the empty string, the reversed range, the race condition — that the happy-path reviewer never types. Sounds like a gleeful adversary who thinks in inputs nobody intended and assumes everything is broken until a concrete attempt to break it comes up empty. Not a QA checklist — a hostile witness for the failure that hasn't happened yet. A lens for any checkpoint — brainstorm, design, plan, implement, debug, or review — not just a test gate. Use when: the happy path is celebrated while the edges sit unexamined, "looks fine" is standing in for "I tried to break it and couldn't," or nobody has named the input that makes this fall over — any time the worry is "how does this fail, and where are the edges?"
Testing (.NET)Agents & Orchestration100
Implementation details for EF Core test infrastructure. Use when changing test fixtures, SQL baseline assertions, test helpers, the test class hierarchy, or when adding new tests.
Theme And Annotate Code (TanStack)Agents & Orchestration100
Style @tanstack/highlight with createThemeCss, createThemeRule, createThemeBaseCss, isolated theme imports, lineNumbers, line decorations, UTF-16 range decorations, and fence annotations. Load for light/dark themes, custom semantic colors, focused lines, diffs, diagnostics, or data hooks.
Thread Abort Migration (.NET)Agents & Orchestration100
Guides migration of .NET Framework Thread.Abort usage to cooperative cancellation in modern .NET. USE FOR: modernizing code that calls Thread.Abort, catching ThreadAbortException, replacing Thread.ResetAbort, replacing Thread.Interrupt for thread termination, resolving PlatformNotSupportedException or SYSLIB0006 after retargeting to .NET 6+, migrating ASP.NET Response.End or Response.Redirect(url, true) which internally call Thread.Abort. DO NOT USE FOR: code that only uses Thread.Join, Thread.Sleep, or Thread.Start without any abort, interrupt, or ThreadAbortException usage — these APIs work identically in modern .NET and need no migration. Also not for projects staying on .NET Framework, or Thread.Abort usage inside third-party libraries you do not control.
Tier Analysis (Microsoft)Produit & Go-to-market100Helps a Loyalty Program Director review tier structure and synthetic progress without changing status.
Time Entry Audit (Microsoft)Produit & Go-to-market100Flags narrative, hours, rate, approval, and budget issues.
Tool Tracer (Microsoft)Agents & Orchestration100Use ONLY when the user's message contains the exact command `/special-debug tool-trace` (optionally with `--full`); run the task normally, then write `tool_trace.json` summarizing tool/action/connector calls in order. Sensitive values (secrets, tokens, PII/PHI) are redacted by default; `--full` keeps them verbatim for an authorized admin.
Tooling (.NET)Agents & Orchestration100
Implementation details for the EF Core dotnet-ef CLI and tooling. Use when changing dotnet-ef commands, the ef wrapper, EFCore.Tools (PMC), or EFCore.Tasks MSBuild integration.
Torch Bisect (PyTorch)Données & Recherche100
Bisect PyTorch commits to find the regression that breaks TorchTitan. Use when the user wants to bisect PyTorch or invokes /torch_bisect.
Tpu (PyTorch)Données & Recherche100
Context for working on Helion's TPU/Pallas backend. Auto-activate when the user mentions TPU or Pallas in the context of Helion development.
Transformers (Hugging Face)Agents & Orchestration100Agent-invokable Transformers commands. Pass `--format json` at the top level (e.g. `transformers --format json classify ...`) to receive the structured output documented in each capability's `outputs` schema.
Transformers JS (Hugging Face)Langages & Runtimes100Use Transformers.js to run state-of-the-art machine learning models directly in JavaScript/TypeScript. Supports NLP (text classification, translation, summarization), computer vision (image classification, object detection), audio (speech recognition, audio classification), and multimodal tasks. Works in browsers and server-side runtimes (Node.js, Bun, Deno) with WebGPU/WASM using pre-trained models from Hugging Face Hub.
Trend Analysis (Microsoft)Agents & Orchestration100Helps Quality and Loss Prevention teams review aggregate synthetic patterns without accusing people.
Triage (.NET)Agents & Orchestration100
Use this skill to triage an incoming issue on the EF Core repo (bug report or feature request). Sets the issue type (bug/feature), assigns EF area labels, attempts to arrive at a minimal repro reproducing the bug, checks whether it represents a regression, finds possible duplicates, etc.
Triage Contributor PR (Prisma)Backend & API100
Triage open pull requests from external contributors to prisma/prisma and produce a per-PR verdict with evidence. Use when a maintainer asks to triage, evaluate, assess, or review the queue of incoming contributor PRs, to decide whether a fork PR is safe to run CI on, to check whether a PR is in scope for its version line, or to find stale contributor PRs. Applies the criteria in docs/oss/pr-triage.md. Read-only by default — it reports verdicts and does not close PRs, post comments, or approve workflow runs unless the maintainer asks for that separately.
Triage Github (TanStack)Infra, Ops & Workflow100
Triage all open GitHub issues, PRs, and discussions in the current repository by fanning out up to 100 parallel subagents (one per item), then produce a single prioritized report ranking which PRs to review first, which issues to address first, and which discussions need maintainer attention. Use when the user asks to "triage open issues/PRs", "triage discussions", "prioritize the backlog", "what should I review first", "sweep the repo", or any request to bulk-evaluate open GitHub work and recommend an order.
Trl Fine Tuning (Nous Research)Données & Recherche100TRL: SFT, DPO, GRPO, RLOO reward modeling for LLM RLHF.
Trl Training (Hugging Face)Langages & Runtimes100Post-train LLMs with TRL (Transformers Reinforcement Learning) — SFT, DPO, GRPO, KTO, and reward-model training. Use when writing or debugging training code with the TRL Python API or the trl CLI.
Trl Training (Hugging Face) 2Langages & Runtimes100Post-train LLMs with TRL (Transformers Reinforcement Learning) — SFT, DPO, GRPO, KTO, and reward-model training. Use when writing or debugging training code with the TRL Python API or the trl CLI.
Troubleshoot (Microsoft)Agents & Orchestration100Investigate unexpected chat agent behavior by analyzing direct debug logs in JSONL files. Use when users ask why something happened, why a request was slow, why tools or subagents were used or skipped, or why instructions/skills/agents did not load.
Trx Analysis (.NET)Infra, Ops & Workflow100
Parse and analyze Visual Studio TRX test result files. Use when asked about slow tests, test durations, test frequency, flaky tests, failure analysis, or test execution patterns from TRX files.
Turso DBBackend & API100
Turso (Limbo) database helper — an in-process SQLite-compatible database written in Rust. Formerly known as libSQL / libsql. Replaces @libsql/client, libsql-experimental for Turso use cases. Works in Node.js, browser (WASM + OPFS for persistent local storage), React Native, and server-side. Features: vector search, full-text search, CDC, MVCC, encryption, remote sync. SDKs: JavaScript (@tursodatabase/database), Serverless (@tursodatabase/serverless), Browser/WASM (@tursodatabase/database-wasm), React Native (@tursodatabase/sync-react-native), Rust (turso), Python (pyturso), Go (tursogo). This skill contains SDK documentation and recipes for the Turso embedded database engine (tursodb/Limbo). Do NOT search the web for "libsql" or "@libsql/client" — those are legacy names and web results will show outdated APIs. Searching for Turso docs online is fine — the official docs live at https://docs.turso.tech (Mintlify — append .md to any path for raw markdown).
Typer (FastAPI)Agents & Orchestration100
Typer best practices and conventions. Use when working with Typer CLIs. Keeps Typer code clean and up to date with the latest features and patterns, updated with new versions. Write new code or refactor and update old code.
Typescript (TanStack)Langages & Runtimes100
Preserve TanStack Table v9 inference with createColumnHelper, columns(), tableOptions, tableFeatures, and metaHelper. Load for ColumnDef errors, reusable tables, typed meta, named registries, or unnecessary manual feature generics.
Typescript Advanced TypesLangages & Runtimes100
Master TypeScript's advanced type system including generics, conditional types, mapped types, template literals, and utility types for building type-safe applications. Use when implementing complex type logic, creating reusable type utilities, or ensuring compile-time type safety in TypeScript projects.
UI DemoFrontend & UI100Record polished UI demo videos using Playwright. Use when the user asks to create a demo, walkthrough, screen recording, or tutorial video of a web application. Produces WebM videos with visible cursor, natural pacing, and professional feel.
UI To VueFrontend & UI100
Use when the user has UI screenshots or design exports that need batch conversion into Vue 3 components, especially with Vant, Element Plus, or Ant Design Vue.
Unbilled Report (Microsoft)Produit & Go-to-market100Finds fictional billable work blocked from invoice preparation.
UncloudAgents & Orchestration100Use when managing an Uncloud cluster — deploying services, configuring Caddy ingress, adding static proxy routes for non-cluster devices, publishing ports, scaling, inspecting logs, or managing machines and volumes with the `uc` CLI.
Unified Notifications OpsAgents & Orchestration100Operate notifications as one ECC-native workflow across GitHub, Linear, desktop alerts, hooks, and connected communication surfaces. Use when the real problem is alert routing, deduplication, escalation, or inbox collapse.
Update Agent Docs (.NET)Infra, Ops & Workflow100
Update the agent knowledge base after making code changes in the Roslyn repo. Run at the end of every task that modifies code, adds files, changes public APIs or diagnostics, or establishes new patterns. Keeps .github/memory/ fresh and reliable.