Create, update, reorganize, or review Happier internal technical documentation and published user/operator/contributor docs with evidence-backed product truth, exact release status, canonical-page ownership, human voice, minimal editing, and appropriate validation. Use whenever a change affects `docs/**`, `apps/docs/**`, or behavior that may make existing Happier documentation incomplete or false.
Work with MongoDB (document database, BSON documents, aggregation pipelines, Atlas cloud) and PostgreSQL (relational database, SQL queries, psql CLI, pgAdmin). Use when designing database schemas, writing queries and aggregations, optimizing indexes for performance, performing database migrations, configuring replication and sharding, implementing backup and restore strategies, managing database users and permissions, analyzing query performance, or administering production databases.
Author, document, review, or audit unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, and changes to safety or behavioral contracts.
Maintain a Docusaurus product manual whose prose, navigation, localized page trees, screenshots, coverage metadata, and release build must stay aligned with the application. Use when adding or revising manual pages, documenting a product change, updating translated MDX, repairing locale parity, adding registered screenshots, auditing stale documentation, or validating a multilingual Docusaurus site before publication.
Use when writing, editing, or organizing documentation, when planning what docs a feature needs, and whenever planning or implementing a new feature or change in a repo (docs ship with the code). Also use when tempted to write docs without showing the discovered readers to the user, without asking for tone, or without loading simple-english and i-have-adhd. Triggers on "write docs for X", "document this feature", "add a guide", "update the docs", "reorganize the docs", "plan feature X", "implement X", or /docs.
Generate professional company tear sheets using S&P Capital IQ data via the Kensho LLM-ready API MCP server. Use this skill whenever the user asks for a tear sheet, company one-pager, company profile, fact sheet, company snapshot, or company overview document — especially when they mention a specific company name or ticker. Also trigger when users ask for equity research summaries, M&A company profiles, corporate development target profiles, sales/BD meeting prep documents, or any concise single-company financial summary. This skill supports four audience types: equity research, investment banking/M&A, corporate development, and sales/business development. If the user doesn't specify an audience, ask. Works for both public and private companies.
Author, document, review, audit, or redesign unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, changes to safety or behavioral contracts, and proof-oriented redesign of unsafe abstractions.
Author, document, review, audit, or redesign unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, changes to safety or behavioral contracts, and proof-oriented redesign of unsafe abstractions.
Author, document, review, audit, or redesign unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, changes to safety or behavioral contracts, and proof-oriented redesign of unsafe abstractions.
Author, document, review, audit, or redesign unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, changes to safety or behavioral contracts, and proof-oriented redesign of unsafe abstractions.
Author, document, review, audit, or redesign unsafe Rust with proof-grade rigor. Use for unsafe blocks and functions, unsafe traits and impls, raw pointers, FFI, inline assembly, intrinsics, layout or validity reasoning, concurrency and atomics, SIMD and target features, allocators, invariant-bearing fields, safety comments or `# Safety` documentation, soundness reviews, TCB audits, generated unsafe code, changes to safety or behavioral contracts, and proof-oriented redesign of unsafe abstractions.
Use when writing, reviewing, or refactoring SwiftUI code for iOS or macOS, including state and `@Observable` data flow, view composition, resizable layouts, safe areas, display scale, performance, lists, environment, localization, animation, Liquid Glass, and API migration. Also use for iPhone Duo or foldable layouts, `ArrangementView`, `ReservedRegion`, hinge effects, vertical bars, `@State` initialization or synthesized-property diagnostics, `@ContentBuilder` ambiguity, `reorderable` drag/drop, custom `AsyncImage` `URLSession`, swipe actions outside List, item-bound `alert`/`confirmationDialog`, `ToolbarOverflowMenu`, `AnimatableValues`, Document APIs (`Document`/`DocumentReader`), and Instruments `.trace` capture or analysis.
Draft a structured preregistration document (OSF, AsPredicted, or AEA RCT Registry style) from a research spec or free-form study description. Output is a Markdown file with hypotheses, design, sampling plan, analysis plan, exclusions, and inference criteria — annotated with MUST / SHOULD / MAY clarity flags. Use when user says "preregister", "draft a preregistration", "OSF preregistration", "AsPredicted", "AEA RCT registry", "PAP", "preanalysis plan", or before launching an experiment / data collection / analysis on data the analyst has not yet seen. NOT a registry submission tool — produces a document the user uploads to OSF / AsPredicted / AEA themselves.
Author, edit, or extend the Carbon documentation site at `docs` (a built Fumadocs + Next.js app). Use whenever creating or changing reader-facing docs for Carbon: editorial Guide chapters, Reference/entity pages, the docs IA, or "document this feature" requests — anything destined for the docs site. Covers the grounded-in-source authoring workflow, the flow-based Guide architecture, the real MDX components for each surface, the warm-paper house style, and the build verification loop. Trigger even if the user doesn't say "docs" but clearly wants explanatory, reader-facing written material about how Carbon works.
Run large-scale batch NER, PII extraction, or de-identification over many clinical notes on-device with OpenMed, with sharding, checkpointing, resumability, and append-only JSONL output. Use when the user needs to process a corpus or folder of notes, de-identify a dataset, run NER over thousands of documents, build a resumable batch pipeline, or stream results to JSONL without holding everything in memory. Covers process_batch / BatchProcessor / BatchItem / BatchResult, the operation= selector (analyze_text | extract_pii | deidentify), iter_process streaming, the PHI-safe on_progress callback, chunking long documents, and no-PHI logging. Produces a resumable batch runner over an OpenMed model.
Plain text files in a repository that tell a coding agent how the project works: commands to run, conventions to follow and things to avoid. CLAUDE.md, AGENTS.md, cursor rules and skills are the common kinds.
CLAUDE.md or AGENTS.md?
CLAUDE.md is read by Claude Code. AGENTS.md is an open format that Codex, Cursor and other agents read. Many projects keep one and point the other at it.
What is a skill?
A folder with a SKILL.md that describes one capability, such as filling PDFs or reviewing code. The agent loads it only when the task calls for it.
Can I search my own team's files too?
Your agents already can, over MCP, limited to the files you're allowed to read. Searching them from this page is coming.