python-skills

In the author's own words, from each skill's SKILL.md — showing the first 30 of 42 files.

• building-accessible-interfaces

  Makes web and app UIs usable by keyboard, screen-reader, low-vision and motion-sensitive users — semantic HTML before ARIA, labelled controls, visible focus, WCAG AA contrast measured rather than eyeballed, touch targets, reduced motion, and automated axe checks plus a manual keyboard pass in CI or before every UI PR. Use when building or restyling a screen, adding a form, modal, menu or custom c…

  skills/common/accessible-interfaces/SKILL.md on GitHub (opens in a new tab)

• wiring-application-config

  Load, merge, and validate layered application configuration (defaults plus a user YAML/TOML/JSON file or a stored settings object) so a mis-wired or misspelled key fails loudly instead of silently reverting to the default — sections the code reads that exist nowhere, sections that exist but nothing reads, unvalidated recursive merges, `bool`-passes-as-`int`, defaults aliased by a shallow merge, f…

  skills/common/app-config/SKILL.md on GitHub (opens in a new tab)

• shipping-build-artifacts

  Make the build step a real gate on what you actually distribute — build scripts that warn and exit 0 on a missing input, size checks with only an upper bound, hand-maintained file lists that drift from the entrypoints they must cover, committed bundles that go stale when only the source changes, GNU-only shell in release scripts that aborts on the other OS, and verification that runs against the…

  skills/common/build-artifacts/SKILL.md on GitHub (opens in a new tab)

• permissioning-ci-workflows

  Give a CI job exactly the credentials it needs and know when it has none — declaring `permissions:` explicitly because the default GITHUB_TOKEN scope is a repo setting, reading the 403's x-accepted-github-permissions header instead of guessing the missing scope, one API call needing two scopes, a fork pull request getting a read-only token and no repository secrets, event-conditioned steps that s…

  skills/common/ci-permissions/SKILL.md on GitHub (opens in a new tab)

• concurrent-branches

  Resolve conflicts and merges when several branches are open against one repo at the same time — the hotspot files every change must touch (registry manifests, a single version field, shared tool config, one aggregated test module, tracked build output), union-vs-recompute-vs-rebuild as three different correct resolutions, generated artifacts that must never be merged, non-deterministic serializat…

  skills/common/concurrent-branches/SKILL.md on GitHub (opens in a new tab)

• shipping-across-surfaces

  Land a change everywhere the same fact is stated — enumerating the full surface inventory (landing copy, docs, machine-readable summaries, changelog badges repeated across every page, sitemap, README, descriptions embedded in code, and untyped frontend consumers of typed responses), generating a surface instead of restating it, drift tests where you cannot generate, never hand-maintaining a copy…

  skills/common/cross-surface-changes/SKILL.md on GitHub (opens in a new tab)

• writing-defect-reports

  Establish a finding before you publish it, and correct it after — headlines that overstate what actually reproduces at the layer a user sees, reporting code that no entry point can reach or that is already dead, filing a caveat the project's own records already answered, re-verifying your prior notes against the tree instead of against the note, choosing the narrowest injection point that reprodu…

  skills/common/defect-reports/SKILL.md on GitHub (opens in a new tab)

• reporting-derived-metrics

  Compute statistics, scores, and flags from samples that may be too small to support them — undefined dispersion returned as 0.0 and tripping a minimum threshold, sentinel choice (None vs 0 vs NaN), threshold blocks gated on "was this measured", reports that narrate findings from absent data, nullability as a public API change, `is None` vs truthiness, broad excepts that turn a metric bug into a n…

  skills/common/derived-metrics/SKILL.md on GitHub (opens in a new tab)

• guarding-destructive-operations

  Add and review preconditions on operations that delete, overwrite, rewrite history, or resolve a caller-supplied name to a filesystem path — refusing instead of warning, placing the guard ahead of the first mutation, structural classification rather than string-prefix matching, name validation plus resolved-path containment as two independent checks, why a guard on the destructive path is invisib…

  skills/common/destructive-operations/SKILL.md on GitHub (opens in a new tab)

• keeping-git-repos-clean

  Prevents, detects, and remediates files that should never be committed — secrets (.env, API tokens, hardcoded credentials) and dev artifacts (build output, scratch databases, editor/OS files). Covers .gitignore (and why it does not untrack), git rm --cached, auditing tracked files, history scrubbing, and credential rotation. Use when a repo has committed secrets or junk, when setting up a new rep…

  skills/common/git-hygiene/SKILL.md on GitHub (opens in a new tab)

• running-github-actions-efficiently

  Cut GitHub Actions minutes and wall-clock time without losing coverage — the OS billing multiplier (macOS 10x / Windows 2x / Linux 1x), trigger hygiene that stops push+pull_request double-firing, concurrency that cancels superseded runs, dependency caching keyed on lockfiles, matrix discipline, and auditing scheduled crons that bill 24/7. Use when CI is burning included minutes, when runs feel sl…

  skills/common/github-actions/SKILL.md on GitHub (opens in a new tab)

• designing-interaction-states

  Designs the states screens actually spend their time in — first-run and empty states, loading and skeletons, inline validation and error messages, success feedback, destructive confirmations, and the microcopy for each — so a product feels finished instead of only working on the happy path. Use when building a form, list, dashboard, upload, checkout or settings screen, adding an async action, wri…

  skills/common/interaction-states/SKILL.md on GitHub (opens in a new tab)

• designing-marketing-pages

  Designs landing, pricing, comparison and product pages that explain the product fast and convert honestly — one-sentence value proposition above the fold, a single primary call to action, real product screenshots instead of stock art, proof, a clear pricing table, fast responsive pages, and no dark patterns. Use when building or redesigning a landing page, marketing site, pricing or comparison pa…

  skills/common/marketing-pages/SKILL.md on GitHub (opens in a new tab)

• rendering-untrusted-content

  Renders stored, authored, or imported content into HTML without shipping XSS — auditing every autoescape bypass (|safe, Markup, innerHTML), sanitizing Markdown output with an allowlist, escaping on both the server and the DOM, and writing sanitization tests that assert on the right copy of the string. Use when adding a Markdown or rich-text filter, rendering user/admin-authored content, reviewing…

  skills/common/rendering-untrusted-content/SKILL.md on GitHub (opens in a new tab)

• reproducing-ci-locally

  Run the CI gate on your machine so it agrees with the runner — deriving the exact command, paths, markers, and env from the workflow file instead of the Makefile, unblocking gate steps that short-circuit and hide the next failure, pinning the linter version CI resolves, building the interpreter/toolchain environment the runner builds, and confirming the run is green instead of explaining a red jo…

  skills/common/reproducing-ci-locally/SKILL.md on GitHub (opens in a new tab)

• running-resumable-sync-jobs

  Design and review long-running batch or sync jobs that process many items against a remote API and persist checkpoint state — exit codes that report partial failure, checkpoints that are safe to resume and written atomically, per-item tolerance vs. fatal abort, telling "zero" apart from "couldn't fetch", bounded retries, honest dry-runs, timezone-safe incremental cursors, and compensating reserve…

  skills/common/sync-jobs/SKILL.md on GitHub (opens in a new tab)

• normalizing-text-for-measurement

  Strip, parse, and segment a document before something else measures it — normalizers that fuse two blocks into one word because a close-token emits no separator, the two metric classes failing on different residue — character-based ones (reading time, token budgets, size limits) inflated by leftover syntax, word-based ones (word count, readability) corrupted by boundaries the strip never inserted…

  skills/common/text-normalization/SKILL.md on GitHub (opens in a new tab)

• calibrating-thresholds-and-baselines

  Check that a score-threshold-flag pipeline actually separates anything before you trust or tune it — reference constants that are hand-authored but formatted as measurements, a computed feature whose units do not match the constant it is compared against, per-class fire rates that expose a flag firing on nearly every item of both classes, rate features confounded by item length, confidence scores…

  skills/common/threshold-calibration/SKILL.md on GitHub (opens in a new tab)

• designing-interfaces

  Makes a product's UI look deliberate and current instead of dated or improvised — auditing a screen against hierarchy, type scale, spacing scale, color tokens, layout and component consistency; introducing design tokens before restyling anything; and verifying every change visually with before/after screenshots. Use when building or restyling any web or app screen, reviewing a UI that looks old,…

  skills/common/ui-design/SKILL.md on GitHub (opens in a new tab)

• verifying-external-behavior

  Confirms what a third-party library, remote API, build backend, or scraped document actually does before writing code that depends on it — throwaway probes that run in seconds, permissive clients that forward wrong arguments instead of rejecting them, per-endpoint docs that don't generalize, response shapes that make a "fast path" always-false, fakes that encode your assumption rather than the se…

  skills/common/verifying-external-behavior/SKILL.md on GitHub (opens in a new tab)

• building-go-projects

  Sets up and maintains Go projects with a CI gate that actually gates — module-path correctness, golangci-lint config that matches the installed major version, deterministic gofmt, a pinned toolchain, and meaningful test/lint jobs. Use when creating a Go module, wiring GitHub Actions for Go, debugging a golangci-lint or gofmt CI failure on an unrelated PR, or reviewing a Go CLI that shells out to…

  skills/go/projects/SKILL.md on GitHub (opens in a new tab)

• building-browser-extensions

  Builds and tests Manifest V3 browser extensions — service-worker message channels that survive teardown, chrome.storage read-modify-write safety, settings validation in the popup, and a Jest chrome mock that can actually fail. Use when writing or reviewing a background service worker, a popup that reads/writes chrome.storage, an extension's Jest suite, or debugging an extension whose UI silently…

  skills/javascript/browser-extensions/SKILL.md on GitHub (opens in a new tab)

• designing-python-apis

  Designs intuitive Python library APIs following principles of simplicity, consistency, and discoverability. Handles public re-exports, API evolution, deprecation, breaking changes, and error handling. Use when designing or reviewing a library API, exposing a symbol from a package __init__, or managing API versioning and deprecations.

  skills/python/api-design/SKILL.md on GitHub (opens in a new tab)

• building-python-clis

  Builds command-line interfaces for Python libraries using Click or Typer. Includes command groups, argument handling, progress bars, shell completion, and CLI testing with CliRunner. Use when adding CLI functionality to a library or building standalone command-line tools.

  skills/python/cli-development/SKILL.md on GitHub (opens in a new tab)

• improving-python-code-quality

  Improves Python library code quality through ruff linting, mypy type checking, Pythonic idioms, and refactoring. Use when reviewing code for quality issues, adding type hints, configuring static analysis tools, or refactoring Python library code.

  skills/python/code-quality/SKILL.md on GitHub (opens in a new tab)

• building-python-communities

  Builds and manages open source Python library communities including CONTRIBUTING.md, CODE_OF_CONDUCT.md, issue/PR templates, contributor recognition, and GitHub automation. Use when setting up community infrastructure, improving contributor experience, or managing project governance.

  skills/python/community/SKILL.md on GitHub (opens in a new tab)

• documenting-python-libraries

  Creates comprehensive Python library documentation including Google-style docstrings, Sphinx setup, API references, tutorials, and ReadTheDocs configuration. Use when writing docstrings, setting up Sphinx documentation, or creating user guides for Python libraries.

  skills/python/documentation/SKILL.md on GitHub (opens in a new tab)

• deferring-heavy-dependencies

  Keep expensive resources — ML models, spellcheck dictionaries, embedded databases, large third-party imports — off code paths that never use them. Covers constructor work paid by every caller, one-size factories that load the heaviest member for the cheapest request, load-and-unload-per-call masquerading as a cache, measuring per-call cost in a fresh process, telling a one-time import from a repe…

  skills/python/lazy-dependencies/SKILL.md on GitHub (opens in a new tab)

• reviewing-python-libraries

  Comprehensively reviews Python libraries for quality across project structure, packaging, code quality, testing, security, documentation, API design, and CI/CD. Provides actionable feedback and improvement recommendations. Use when evaluating library health, preparing for major releases, or auditing dependencies.

  skills/python/library-review/SKILL.md on GitHub (opens in a new tab)

• building-llm-backed-features

  Builds application features on top of an LLM API in Python — prompt surfaces that drift apart, structured outputs, context budgeting, model/config wiring, filtered evaluator sets, keeping live-model calls out of default CI, evaluating stochastic output, and presenting model output truthfully. Use when adding an LLM call to an app, designing structured outputs or prompt templates, filtering audit…

  skills/python/llm-features/SKILL.md on GitHub (opens in a new tab)

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