Specify an internal code-level interface (module API / library / port) — signatures with preconditions + postconditions + invariants + error taxonomy (category + recovery) + time/space complexity + concurrency + idempotency + lifetime/ownership + stability label (stable/experimental/deprecated/internal). Mandatory examples: happy + edge + failure. Testability + alternative designs. Distinct from api-contract-specification (network APIs).
Plugin interface-specification from marketplace svens-claude-plugins in SSiertsema/claude-code-plugins. Commands read from the repo's manifest — 1 month ago.
interface-specificationSpecify an internal interface — signatures, pre/postconditions, invariants, error taxonomy, idempotency, complexity bounds, ownership, stability, examples. Module-level / library-level. Not a network contract.
Frame A/B tests with falsifiable hypothesis, variants, pre-committed primary/secondary/guardrail metrics, MDE, sample size (formula shown), duration spanning a weekly cycle, peek policy, pre-committed decision rule, validity risks with mitigations, and ethics review. Mermaid diagrams with optional PNG export.
1 skill
Write, audit, or split acceptance criteria for a user story. Given/When/Then (Gherkin) default + rule-based + mixed formats. Systematic coverage (happy path + negative + edge + boundary + a11y + optional performance/security/data/integration). INVEST at story + AC level. SPIDR split (Spike / Path / Interface / Data / Rule) when story too big. Scenario outlines for parametric data. Mermaid coverage pie + split diagrams with optional PNG export.
1 skill
Define accessibility requirements against WCAG 2.2 AA (default), AAA, EN 301 549, EAA, Section 508, ADA. Produces per-feature Given/When/Then criteria, assistive-technology support matrix per platform, combined automated + manual + AT + user-testing plan, and remediation priority for existing products. Not a conformance audit. Mermaid diagrams with optional PNG export.
1 skill
Write, review, supersede, or index Architecture Decision Records. Michael Nygard format (default) + Y-statement alternative. Immutable once accepted — supersession chain preserves old ADRs. Status lifecycle (Proposed / Accepted / Deprecated / Superseded). ADR log with chronological index + supersession chains visible. Review mode flags stale ADRs + missing consequences. Integrates with traceability-matrix. Mermaid timeline with optional PNG export.
1 skill
Bottom-up thematic clustering of unstructured items (research notes, interview quotes, brainstorm ideas, feedback) using the KJ method. Discovers emergent themes with evidence traceability, identifies patterns/tensions/gaps, flags outliers, and prioritizes clusters by signal strength. Mermaid diagrams with optional PNG export.
1 skill
Algorithm design pre-implementation: problem + inputs/outputs + constraints, ≥2 candidate approaches compared on time+space+stability+in-place+parallelism, chosen approach with loop/data/global invariants, language-neutral pseudocode, correctness argument (invariant / induction / preservation / reduction), edge-case catalog, worst/avg/space complexity, numerical + concurrency concerns, property-based + boundary + performance + fuzz tests, parallelization + out-of-core + streaming variants.
1 skill
Comprehensive feature development workflow with specialized agents for codebase exploration, architecture design, and quality review
1 command · 3 agents
AI-powered codebase understanding — analyze, visualize, and explain any project
9 skills · 10 agents · hooks
Recommended: all published HyperFrames skills in one versioned bundle. Create and render videos from HTML: the contract, film, captions, overlays, motion and look references, the CLI, the registry, media, Figma, slideshows and Remotion ports.
22 skills
Agent runtimes — local WASM-sandboxed agents (rvagent) + Anthropic Claude Managed Agents (cloud); one interface, local-vs-cloud backends
5 skills · 2 commands · 9 agents
Editorial diagrams in your brand, as self-contained HTML and SVG. Architecture, flowcharts, sequence, state machines, ER and database schemas, timelines, swimlanes, org charts, Gantt, Wardley maps, user journeys, service blueprints, UML class, lifecycle phase maps, and charts from bar, line and scatter to Sankey, treemap and heatmap, plus many more. Redraws draw.io, Mermaid, Excalidraw and PlantUML files. Exports SVG and PNG.
1 skill · 7 commands
53 marketing skills for technical marketers and founders: CRO, copywriting, cold email, prospecting, SEO, AI SEO, paid ads, SMS, ad creative, video production, image generation, co-marketing, churn prevention, pricing, referrals, revenue operations, sales enablement, customer research, site architecture, comprehensive AARRR-structured marketing plans, public relations and earned media, offer design, event marketing and webinars, and more
53 skills
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