Paperclip

Builds real-time communication systems with WebSockets or Socket.IO including bidirectional messaging, horizontal scaling with Redis, presence tracking, and room management.

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Headless Chromium CLI for QA testing and site dogfooding. 100-200ms per command after startup. Persistent state with cookies, tabs, sessions. Snapshot system with element refs. Navigate, interact, verify page state, take screenshots, check responsive layouts, test forms, handle dialogs.

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Multi-AI second opinion via OpenAI Codex CLI. Three modes: Review (pass/fail gate), Challenge (adversarial edge-case finder), Consult (freeform with session continuity). Read-only with streaming output and thinking traces. Cross-model analysis when review has already run.

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Build a complete design system from scratch. Competitive research via web search and browse. SAFE/RISK breakdown of choices. Self-contained HTML preview page. Outputs DESIGN.md as project design source of truth.

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Post-ship documentation sync. Updates README, ARCHITECTURE, CONTRIBUTING, CHANGELOG, TODOS, VERSION. Auto-applies factual corrections, asks for risky rewrites. CHANGELOG voice polish. Cross-doc consistency checks.

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YC Office Hours — product idea diagnostic before writing code. Two modes: Startup (6 forcing questions with rigorous pushback) and Builder (generative brainstorming). Outputs design doc. Includes landscape research, premise challenge, alternatives generation, visual wireframe sketching, and optional cross-model second opinion.

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CEO/founder-mode plan review. Four modes: scope expansion, selective expansion, hold scope, scope reduction. 10 review sections from architecture through long-term trajectory. Nuclear scope challenge, dream state mapping, error and rescue registry. Optional cross-model outside voice.

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Design critique with 7 rated passes: Information Architecture, Interaction State Coverage, User Journey and Emotional Arc, AI Slop Risk (10-item blacklist), Design System Alignment, Responsive and Accessibility, Unresolved Decisions. Each rated 0-10 with gap-fill loop. Parallel cross-model design voices.

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Weekly engineering retrospective. Analyzes commit history, work patterns, and code quality metrics. Per-person breakdowns with praise and growth areas. Modes: default 7d, 24h, 14d, 30d, compare, global cross-project. Shipping streaks and tweetable summary.

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Annotated data matrix operations for single-cell genomics using AnnData

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Gene regulatory network inference using tree-based ensemble methods

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Search and retrieve preprints from the arXiv repository

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AI-powered academic paper search and retrieval

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Fully automated review pipeline: CEO, Design, and Eng reviews with auto-decisions using 6 principles (completeness, boil lakes, pragmatic, DRY, explicit over clever, bias toward action). Only pauses for premise confirmation. Classifies decisions as Mechanical (silent) or Taste (surfaced at final gate).

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Performance regression detection. Captures TTFB, FCP, LCP, bundle sizes, request counts. Regression thresholds: timing >50% or >500ms. Baseline comparison, trend tracking, budget compliance scorecard.

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Post-deploy monitoring. Watches live app via headless browser for console errors, performance regressions, page failures, visual anomalies. Alert on deltas not absolutes, transient tolerance (2+ consecutive checks). Default 10-minute monitoring window. Baseline capture mode.

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Live-site visual QA audit with fix loop. 10-category checklist (~80 items) including AI Slop Detection (10 blacklisted patterns). Atomic commits per fix. Before/after screenshots. A-F grading. Parallel cross-model code-level design audit. Modes: Full, Quick, Deep, Diff-aware, Regression.

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Eng manager-mode plan review. Scope challenge, architecture review, code quality review, detailed test coverage diagram, performance review. Produces test plan artifact for downstream QA. Optional cross-model outside voice.

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Report-only QA — same browser-based testing as qa but documents bugs with screenshots and repro steps only, no code changes. Health score formula weighted across 8 categories. Outputs to .gstack/qa-reports/.

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Import cookies from your real browser (Comet, Chrome, Arc, Brave, Edge) into the headless browse session for testing authenticated pages. Interactive picker UI or direct domain import. macOS Keychain integration.

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Fully automated ship workflow: pre-flight, merge base, run tests, coverage audit, pre-landing review, design review, adversarial review, version bump, CHANGELOG generation, TODOS.md update, bisectable commits, push and PR creation, auto-sync docs via document-release.

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Financial market data retrieval and analysis via Alpha Vantage API

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Biological sequence analysis, alignment, and molecular biology computations

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Programmatic access to biological web services and databases

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