The library

Everything we index — ranked by what works, never by stars.

works · untested / no effect · hurts — every rank is measured against a no-skill baseline
untested
Detect and mitigate algorithmic biasskillProductEngineeringL3
ethics-governance · When auditing models for bias, designing privacy-preserving systems, establishing governance processes, or evaluating the social impact of data-driven decisions.
untested
Convert files to semantic embeddingsskillEngineeringDataL2
cradle-ecosystem-data-ingestion · When this is the appropriate approach for the task.
untested
Master machine learning fundamentalsskillEngineeringDataL1
machine-learning-foundations · When building predictive models, selecting algorithms, or understanding the machine learning pipeline.
untested
Build extraction pipelines consistentlyskillEngineeringL1
skill · When this is the appropriate approach for the task.
untested
Write professional commit messagesskillEngineeringL1
beautiful-commits · When committing changes or writing commit messages.
untested
Review code for quality and bugsskillEngineeringL1
code-review · When reviewing prs or checking code quality.
untested
Generate comprehensive test casesskillEngineeringProductL1
test-generator · When writing tests or creating test suites.
untested
Write type-safe TypeScriptskillEngineeringL1
typescript-patterns · When writing typescript, fixing type errors, or working with generics.
untested
Scan skills for security threatsskillEngineeringOpsL1
scan-skills · When this is the appropriate approach for the task.
untested
Understand algorithmic bias and opacityskillProductEngineeringL1
algorithmic-awareness · When a learner needs to think critically about why particular content reached them.
untested
Search codebases without loading filesskillEngineeringL2
skill · When you want to inspect the actual code rather than a synthesized answer.
untested
Reason about how digital systems workskillEngineeringProductL1
computational-literacy · When a learner needs to build a mental model of computing rather than memorize menu paths.
untested
Write clean, layered codeskillEngineeringL1
skill · Building premium, role-gated ITSM systems for universities without admin panel bloat.
untested
Search and route queries multi-providerskillEngineeringProductL3
web-search-plus-plugin-v2 · Maximizing search result quality by class-aware provider routing with fallback chains.
untested
Build Android APK releasesskillEngineeringL2
SKILL · Use when implementing SKILL is more cost/time-effective than generic alternative.
untested
Delegate code work to Claude CodeskillEngineeringL2
collaborating-with-claude-code · Use when implementing collaborating-with-claude-code is more cost/time-effective than generic alternative.
untested
Analyze DC and AC circuitsskillEngineeringL1
circuit-analysis-dc-ac · Use when implementing circuit-analysis-dc-ac is more cost/time-effective than generic alternative.
untested
Route agents in Hermes orchestratorskillEngineeringL2
hermes-acp-orchestrator · Use when implementing hermes-acp-orchestrator is more cost/time-effective than generic alternative.
untested
Design digital logic circuitsskillEngineeringL1
digital-logic-design · Use when implementing digital-logic-design is more cost/time-effective than generic alternative.
untested
Develop microcontroller firmwareskillEngineeringL3
microcontroller-firmware · Bringing up microcontroller boards from power-on reset through first working peripheral
untested
Design semiconductor componentsskillEngineeringL1
semiconductor-device-physics · Predicting transistor behavior across temperature and supply variations for analog design
untested
Build and optimize digital filtersskillEngineeringL2
signal-processing-dsp-basics · Choosing ADC parameters and filter designs to avoid aliasing in embedded systems
untested
Measure and troubleshoot electronicsskillEngineeringL2
test-and-measurement · Systematic fault-finding on prototype circuits before design review
untested
Prototype and fabricate hardwareskillEngineeringL3
prototyping-fabrication · Building fastest possible prototypes that answer the current design question
untested
Analyze structural and material stressskillEngineeringL2
structural-analysis · Verifying that a structure can safely carry its design loads before fabrication
untested
Recover previous Codex sessionskillEngineeringL1
codexgo · Fast analytics on columnar Parquet data without loading entire files into memory
untested
Document technical specifications and standardsskillEngineeringL1
technical-communication · Creating engineering procedures and design documentation for long-term reference and training
untested
Query Flight SQL servers with Arrow CLIskillEngineeringDataL2
arrow-cli · Quick exploration and transformation of Parquet files in data pipelines
untested
Apply refactors safely across multiple filesskillEngineeringL2
batch-rewrite-pattern · Refactoring identical symbols across 10+ files when manual diff review would be error-prone.
untested
Resume long-running jobs after interruptionsskillEngineeringOpsL3
checkpoint-resume-long-job · Batch data processing, model training, or simulation when full re-run cost exceeds checkpoint overhead.
untested
Generate schemas for Postgres and SQLiteskillEngineeringL2
portable-schema-generator · Bootstrapping validation or documentation when schema does not yet exist but examples exist.
untested
Explore code changes in isolated worktreesskillEngineeringL2
fork · Parallel processing when branch logic is independent and thread/process overhead acceptable.
untested
Audit and fix web accessibility issuesskillEngineeringProductL2
ui-a11y · Meeting regulatory requirement (ADA, EN 301 549) or ensuring product serves disabled users reliably.
untested
Migrate projects to GSD structureskillOpsEngineeringL3
gsd-migrate · Upgrading framework (Next.js 13→14) or swapping persistence (SQL→NoSQL) when breaking changes are unavoidable.
untested
Generate atomic CSS on-demandskillEngineeringL1
unocss · Reducing CSS bundle size when utility-first design adopted and no dynamic styling needed.
untested
Learn GSD commands and workflowsskillEngineeringL1
gsd-onboard · Reducing time-to-first-contribution and catching setup failures before developer time is wasted.
untested
Clean up technical debtskillEngineeringL1
garbage-collection · Identifying highest-leverage tech-debt cleanups with mechanical scoring rather than ad-hoc judgment.
untested
Update project documentationskillEngineeringL1
update-docs · Automating or structuring a commonly needed workflow.
untested
Manage GitHub issues and pull requestsskillEngineeringL2
github · Automating or structuring a commonly needed workflow.
untested
Analyze Claude Code sessionsskillEngineeringL2
braintrust-analyze · Retrospective productivity review and loop-detection when debugging why a session got stuck or repeating the same tool calls
untested
Operate automated dashboard syncskillEngineeringL2
realtime-dashboard-automation · Continuously monitoring forex swing-point signals on a public dashboard, pushing alerts to Notion, and refreshing data every 15 minutes without manual intervention
untested
Render dynamic sites and extract contentskillEngineeringL2
Playwright_Web_Navigator · Extracting content from React/Vue/Angular single-page applications where static HTTP requests return empty or skeleton HTML
untested
Manage Git pull requests and branchesskillEngineeringL1
prs · When developing command-line tools in Rust with clean architecture.
untested
Create new Figma design filesskillEngineeringProductL2
figma-create-new-file · When you need a fresh Figma file before design work or use_figma calls.
untested
Detect Cobalt Strike beacon network activityskillEngineeringL2
hunting-for-cobalt-strike-beacons · When hunting ransomware C2 infrastructure using TLS fingerprints and beacon timing.
untested
Guard protected branches from unsafe operationsskillEngineeringL1
git-safety · When preventing accidental commits, pushes, or force-pushes to protected branches.
untested
Build GraalVM native images with GradleskillEngineeringL2
build-native-image-gradle · When compiling Java applications to standalone native binaries for minimal runtime footprint.
untested
Identify material composition and microstructureskillEngineeringL1
materials-characterization · When you need to identify material phases, measure microstructure, or diagnose failure root cause.
untested
Select optimal materials for design constraintsskillEngineeringL1
materials-selection · When choosing among thousands of candidates under competing objectives like mass and cost.
untested
Create and manage reusable scriptsskillEngineeringL1
scripts · When automating project-specific tasks or orchestrating build and deployment workflows.
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