Arnesto — the agent harness that got out of hand
This repository also configures its own agents. See what arnesto tells them →
Skill Claude CodeCodex
Finds weak or missing tests by analyzing if code changes would be caught. Use when verifying test effectiveness, strengthening test suites, or validating TDD workflows.
Skill Claude CodeCodex
This skill guides the use of Jupyter notebooks for data analysis, exploration, and visualization, particularly with BigQuery. It outlines best practices for notebook execution and validation (supporting both cell-by-cell execution and full notebook generation depending on tool availability), library installation, and…
Skill Claude CodeCodex
Writes tests without mocks using Nullables. Use when writing tests, especially testing code with external I/O (HTTP, files, databases, clocks, random numbers), designing infrastructure wrappers or replacing mocking libraries.
Skill Claude CodeCodex
Interact with Obsidian vaults using the Obsidian CLI to read, create, search, and manage notes, tasks, properties, and more. Also supports plugin and theme development with commands to reload plugins, run JavaScript, capture errors, take screenshots, and inspect the DOM. Use when the user asks to interact with their…
Skill Claude CodeCodex
Use when asked to "set OKRs", "objectives and key results", "quarterly OKR planning", "align objectives", "measure OKR progress", or "focus priorities with OKRs". Helps teams focus on what matters most and create a cadence of progress. The OKR framework (originated by Andy Grove at Intel, popularized by John Doerr at…
Skill Claude CodeCodex
Spec-driven development with OpenSpec. Use when the user mentions OpenSpec, OPSX, spec-driven development, SDD, change proposals, delta specs, /opsx commands, or wants structured planning for features, migrations, refactors, or bug fixes.
Skill Claude CodeCodex
Use when asked to "opportunity solution tree", "OST", "Teresa Torres", "map customer opportunities to outcomes", "structure discovery around opportunities", or "compare solutions for a customer need". Helps product teams connect outcomes to customer opportunities and test solutions with Opportunity Solution Trees…
Skill Claude CodeCodex
Pragmatic property-based testing review and first-wave adoption for this listings-webapp monorepo (Jest + fast-check, unit tests only).
Skill Claude CodeCodex
Implements Manus-style file-based planning to organize and track progress on complex tasks. Creates taskplan.md, findings.md, and progress.md. Use when asked to plan out, break down, or organize a multi-step project, research task, or any work requiring >5 tool calls. Supports automatic session recovery after /clear.
Skill Claude CodeCodex
Use when asked to "PMF survey", "measure product-market fit", "40% rule", "Sean Ellis test", "Rahul Vohra method", or "how disappointed would you be". Helps quantify product-market fit and systematically improve it. The PMF Survey framework (created by Sean Ellis, popularized by Rahul Vohra at Superhuman) measures how…
Skill Claude CodeCodex
Use when asked to "position my product", "positioning canvas", "differentiate from competitors", "figure out our category", "repositioning", or "why customers should pick us". Helps define competitive alternatives, differentiated value, target customers, and market category. April Dunford's positioning framework from…
Skill Claude Code
Generate comprehensive product requirements documents. Use when starting a new feature or product initiative and need structured documentation.
Skill Claude CodeCodex
Use when asked about "product-led growth", "PLG strategy", "self-serve growth", "freemium model", "free trial design", "product-led sales", "PQL", or "bottoms-up growth". Helps design and optimize product-led growth motions where the product drives acquisition, activation, and monetization. Based on frameworks from…
Skill Claude CodeCodex
Use when asked to "product-led SEO", "programmatic SEO", "build programmatic pages", "organic acquisition for product", "decide if SEO is worth it", or "optimize for AI search". Helps evaluate whether SEO fits your business model and how to approach it as a product, not just marketing. The Product-Led SEO framework…
Skill Claude CodeCodex
Maintain or create PROJECTSTATUS.md files at the repository root with the canonical structure (Executive Summary, Completed Components, In Progress, Next Steps, Known Issues, Notes). Use when starting or finishing work on a project, when the user asks to update or create PROJECTSTATUS.md, when a session involves…
Skill Claude CodeCodex
Use when asked to "radical candor", "give feedback that cares", "have a difficult conversation", "challenge directly", "manage performance issues", or "give praise that lands". Helps deliver direct feedback while showing you care. The Radical Candor framework (created by Kim Scott) teaches how to challenge directly…
Skill Claude Code
Iterative code refactoring through progressive lenses via a worker-reviewer agent team.
Skill Claude CodeCodex
Refactoring process. Invoke immediately when user or document mentions refactoring, or proactively when code gets too complex or messy.
Skill Claude CodeCodex
Iterative refinement through multiple passes. Use when the user asks to 'meditate on', 'distill', 'refine', or 'iterate on' something, or proactively when a problem benefits from multiple passes rather than a single attempt.
Skill Claude Code
Sets up an ## Agent skills block in AGENTS.md/CLAUDE.md and docs/agents/ so the engineering skills know this repo's issue tracker (GitHub or local markdown), triage label vocabulary, and domain doc layout. Run before first use of to-issues, to-prd, triage, diagnose, tdd, improve-codebase-architecture, or zoom-out — or…
Skill Claude CodeCodex
Use when asked to "7 Powers", "build a competitive moat", "analyze defensibility", "find sustainable advantage", "economic moats", or "Hamilton Helmer framework". Helps identify durable competitive advantages. The 7 Powers framework (created by Hamilton Helmer) reveals the economic structures that protect business…
Skill Claude CodeCodex
Use when asked to "shape up", "run a shaping session", "set an appetite", "scope a project without estimates", "betting table", or "ship in fixed cycles". Helps teams escape estimate-driven development and Scrum fatigue. The Shape Up method (created by Ryan Singer at Basecamp/37signals) uses fixed time boxes, variable…
Skill Claude CodeCodex
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
Skill Claude CodeCodex
agents/skills/skill-foundry/SKILL.md.
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: