undermybelt
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- ▌ Ecc Autonomous Loops · undermybeltPatterns and architectures for autonomous Claude Code loops — from simple sequential pipelines to RFC-driven multi-agent DAG systems.
- ▌ Ecc Backend Patterns · undermybeltBackend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.
- ▌ Ecc Click Path Audit · undermybeltTrace every user-facing button/touchpoint through its full state change sequence to find bugs where functions individually work but cancel each other out, produce wrong final state, or leave the UI in an inconsistent state. Use when: systematic debugging found no bugs but users report broken buttons, or after any major refactor touching shared state stores.
- ▌ Ecc Coding Standards · undermybeltBaseline cross-project coding conventions for naming, readability, immutability, and code-quality review. Use detailed frontend or backend skills for framework-specific patterns.
- ▌ Ecc Fastapi Patterns · undermybeltFastAPI patterns for async APIs, dependency injection, Pydantic request and response models, OpenAPI docs, tests, security, and production readiness.
- ▌ Ecc Hipaa Compliance · undermybeltHIPAA-specific entrypoint for healthcare privacy and security work. Use when a task is explicitly framed around HIPAA, PHI handling, covered entities, BAAs, breach posture, or US healthcare compliance requirements.
- ▌ Ecc Jira Integration · undermybeltUse this skill when retrieving Jira tickets, analyzing requirements, updating ticket status, adding comments, or transitioning issues. Provides Jira API patterns via MCP or direct REST calls.
- ▌ Ecc Laravel Patterns · undermybeltLaravel architecture patterns, routing/controllers, Eloquent ORM, service layers, queues, events, caching, and API resources for production apps.
- ▌ Ecc Laravel Security · undermybeltLaravel security best practices for authn/authz, validation, CSRF, mass assignment, file uploads, secrets, rate limiting, and secure deployment.
- ▌ Ecc Nextjs Turbopack · undermybeltNext.js 16+ and Turbopack — incremental bundling, FS caching, dev speed, and when to use Turbopack vs webpack.
- ▌ Ecc Nodejs Keccak256 · undermybeltPrevent Ethereum hashing bugs in JavaScript and TypeScript. Node's sha3-256 is NIST SHA3, not Ethereum Keccak-256, and silently breaks selectors, signatures, storage slots, and address derivation.
- ▌ Ecc Plan Orchestrate · undermybeltRead a plan document, decompose it into steps, design a per-step agent chain from the ECC catalogue, and emit ready-to-paste /orchestrate custom prompts. Generative only — never invokes /orchestrate itself. Use when the user has a multi-step plan and wants to drive it through orchestrate without composing chains by hand.
- ▌ Ecc Production Audit · undermybeltLocal-evidence production readiness audit for shipped apps, pre-launch reviews, post-merge checks, and "what breaks in prod?" questions without sending repo data to an external audit service.
- ▌ Ecc Project Flow Ops · undermybeltOperate execution flow across GitHub and Linear by triaging issues and pull requests, linking active work, and keeping GitHub public-facing while Linear remains the internal execution layer. Use when the user wants backlog control, PR triage, or GitHub-to-Linear coordination.
- ▌ Ecc Prompt Optimizer · undermybeltAnalyze raw prompts, identify intent and gaps, match ECC components (skills/commands/agents/hooks), and output a ready-to-paste optimized prompt. Advisory role only — never executes the task itself. TRIGGER when: user says "optimize prompt", "improve my prompt", "how to write a prompt for", "help me prompt", "rewrite this prompt", or explicitly asks to enhance prompt quality. Also triggers on Chinese equivalents: "优化prompt", "改进prompt", "怎么写prompt", "帮我优化这个指令". DO NOT TRIGGER when: user wants the task executed directly, or says "just do it" / "直接做". DO NOT TRIGGER when user says "优化代码", "优化性能", "optimize performance", "optimize this code" — those are refactoring/performance tasks, not prompt optimization.
- ▌ Ecc Pytorch Patterns · undermybeltPyTorch deep learning patterns and best practices for building robust, efficient, and reproducible training pipelines, model architectures, and data loading.
- ▌ Ecc Quarkus Patterns · undermybeltQuarkus 3.x LTS architecture patterns with Camel for messaging, RESTful API design, CDI services, data access with Panache, and async processing. Use for Java Quarkus backend work with event-driven architectures.
- ▌ Ecc Quarkus Security · undermybeltQuarkus Security best practices for authentication, authorization, JWT/OIDC, RBAC, input validation, CSRF, secrets management, and dependency security.
- ▌ Ecc Swiftui Patterns · undermybeltSwiftUI architecture patterns, state management with @Observable, view composition, navigation, performance optimization, and modern iOS/macOS UI best practices.
- ▌ Ecc Angular Developer · undermybelt bundleGenerates Angular code and provides architectural guidance. Trigger when creating projects, components, or services, or for best practices on reactivity (signals, linkedSignal, resource), forms, dependency injection, routing, SSR, accessibility (ARIA), animations, styling (component styles, Tailwind CSS), testing, or CLI tooling.
- ▌ Ecc Dashboard Builder · undermybeltBuild monitoring dashboards that answer real operator questions for Grafana, SigNoz, and similar platforms. Use when turning metrics into a working dashboard instead of a vanity board.
- ▌ Ecc Defi Amm Security · undermybeltSecurity checklist for Solidity AMM contracts, liquidity pools, and swap flows. Covers reentrancy, CEI ordering, donation or inflation attacks, oracle manipulation, slippage, admin controls, and integer math.
- ▌ Ecc Flox Environments · undermybeltCreate reproducible, cross-platform development environments with Flox — a declarative environment manager built on Nix. ALWAYS use this skill when the user needs to: set up a project with system-level dependencies (compilers, databases, native libraries like openssl, libvips, BLAS, LAPACK); configure reproducible toolchains for Python, Node.js, Rust, Go, C/C++, Java, Ruby, Elixir, PHP, or any language; manage environments that must work identically across macOS and Linux; pin exact package versions for a team; run local services (PostgreSQL, Redis, Kafka) alongside development tools; onboard new developers with a single command; or solve 'works on my machine' problems. Especially valuable for AI-assisted and vibe coding — Flox lets agents install tools into a project-scoped environment without sudo, system pollution, or sandbox restrictions, and the resulting environment is committed to the repo so anyone can reproduce it instantly. Use this skill even if the user doesn't mention Flox — if they describe need
- ▌ Ecc Frontend Patterns · undermybeltFrontend development patterns for React, Next.js, state management, performance optimization, and UI best practices.
- ▌ Ecc Gan Style Harness · undermybeltGAN-inspired Generator-Evaluator agent harness for building high-quality applications autonomously. Based on Anthropic's March 2026 harness design paper.
- ▌ Ecc Investor Outreach · undermybeltDraft cold emails, warm intro blurbs, follow-ups, update emails, and investor communications for fundraising. Use when the user wants outreach to angels, VCs, strategic investors, or accelerators and needs concise, personalized, investor-facing messaging.
- ▌ Ecc Ito Trade Planner · undermybeltBuild a non-advisory prediction-market trade planning worksheet for Itô or venue workflows. Use to inspect venues, underliers, constraints, order prerequisites, and manual execution steps without placing trades or recommending positions.
- ▌ Ecc Lead Intelligence · undermybelt bundleAI-native lead intelligence and outreach pipeline. Replaces Apollo, Clay, and ZoomInfo with agent-powered signal scoring, mutual ranking, warm path discovery, source-derived voice modeling, and channel-specific outreach across email, LinkedIn, and X. Use when the user wants to find, qualify, and reach high-value contacts.
- ▌ Ecc Postgres Patterns · undermybeltPostgreSQL database patterns for query optimization, schema design, indexing, and security. Based on Supabase best practices.
- ▌ Ecc React Performance · undermybeltReact and Next.js performance optimization patterns adapted from Vercel Engineering's React Best Practices (https://github.com/vercel-labs/agent-skills). Organizes 70+ rules across 8 priority categories — waterfalls, bundle size, server-side, client fetching, re-render, rendering, JS micro-perf, advanced. Use when writing, reviewing, or refactoring React/Next.js code for performance.
- ▌ Ecc Strategic Compact · undermybeltSuggests manual context compaction at logical intervals to preserve context through task phases rather than arbitrary auto-compaction.
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- ▌ Finishing A Development Branch · undermybeltUse when implementation is complete, verification has passed, and the user needs to choose merge, PR, branch cleanup, or follow-up integration handling.
- ▌ Ecc Agent Payment X402 · undermybeltAdd x402 payment execution to AI agents with per-task budgets, spending controls, and non-custodial wallets. Supports Base through agentwallet-sdk and X Layer through OKX Payments / OKX Agent Payments Protocol.
- ▌ Ecc Cisco IOS Patterns · undermybeltCisco IOS and IOS-XE review patterns for show commands, config hierarchy, wildcard masks, ACL placement, interface hygiene, and safe change-window verification.
- ▌ Ecc Data Scraper Agent · undermybeltBuild a fully automated AI-powered data collection agent for any public source — job boards, prices, news, GitHub, sports, anything. Scrapes on a schedule, enriches data with a free LLM (Gemini Flash), stores results in Notion/Sheets/Supabase, and learns from user feedback. Runs 100% free on GitHub Actions. Use when the user wants to monitor, collect, or track any public data automatically.
- ▌ Ecc Energy Procurement · undermybeltCodified expertise for electricity and gas procurement, tariff optimization, demand charge management, renewable PPA evaluation, and multi-facility energy cost management. Informed by energy procurement managers with 15+ years experience at large commercial and industrial consumers. Includes market structure analysis, hedging strategies, load profiling, and sustainability reporting frameworks. Use when procuring energy, optimizing tariffs, managing demand charges, evaluating PPAs, or developing energy strategies.
- ▌ Ecc Evm Token Decimals · undermybeltPrevent silent decimal mismatch bugs across EVM chains. Covers runtime decimal lookup, chain-aware caching, bridged-token precision drift, and safe normalization for bots, dashboards, and DeFi tools.
- ▌ Ecc Investor Materials · undermybeltCreate and update pitch decks, one-pagers, investor memos, accelerator applications, financial models, and fundraising materials. Use when the user needs investor-facing documents, projections, use-of-funds tables, milestone plans, or materials that must stay internally consistent across multiple fundraising assets.
- ▌ Ecc Ito Basket Compare · undermybeltCompare Itô prediction-market baskets against a user's knowledge base, portfolio notes, financial context, watchlist, or research thesis. Use for read-only basket comparison and gap analysis without investment advice or live trading.
- ▌ Ecc Marketing Campaign · undermybeltEnd-to-end marketing campaign planning and execution. Covers audience research, positioning, campaign angle definition, landing page copy, email sequences, social posts, ad copy, short-form video scripts, and content calendars. Use as the orchestration layer for multi-channel product launches.
- ▌ Ecc Motion Foundations · undermybeltMotion tokens, spring presets, performance rules, device adaptation, accessibility enforcement, and SSR safety for React / Next.js using motion/react. Foundation layer — all other motion skills depend on this.
- ▌ Self Improvement · undermybelt bundlePatterns for AI agents to improve themselves. Learned from actionbook and accomplish-ai. Auto-install tools, create skills, maintain systems.
- ▌ Herm Feis Gate Dbgg · undermybeltDebug Hermes gateway when Feishu/Lark credentials appear configured but the bot does not reply. Covers stale launchd env, platform-not-enabled states, websocket startup failure, and duplicate local gateway conflicts.
- ▌ Math Frml Agen Patt · undermybeltUse when evaluating or absorbing ideas from math-formalization agents such as MathCode into Hermes workflows. Activate when a task involves theorem proving, reusable theorem/axiom stores, subgoal decomposition, proof planning, Lean feedback loops, or tool/skill/plugin split for math work.
- ▌ Mmpl Exte Memo Setu · undermybeltUse when Hermes needs a local external memory layer via MemPalace, or when a user asks to install, isolate, validate, or MCP-connect MemPalace. Activate when you need durable verbatim searchable memory outside Hermes' small built-in memory budget.
- ▌ Provider 403 Ua Fix · undermybelt bundleFix HTTP 403 blocks from custom API providers (WAF/Cloudflare) that reject SDK User-Agent headers. Fixed UA is set in run_agent.py; no more rotation pool.
- ▌ Rust Modu Extr Mono · undermybeltExtract structs and functions from a large Rust main.rs into dedicated module files without breaking compilation. Covers the analyze.rs vs analyze/mod.rs ambiguity pitfall and bottom-up dependency ordering.
- ▌ Subagent Driven Dev · undermybelt bundleExecute plans via delegate_task subagents (2-stage review).
- ▌ Ecc Cost Aware LLM Pipeline · undermybeltCost optimization patterns for LLM API usage — model routing by task complexity, budget tracking, retry logic, and prompt caching.
- ▌ Ecc Healthcare Emr Patterns · undermybeltEMR/EHR development patterns for healthcare applications. Clinical safety, encounter workflows, prescription generation, clinical decision support integration, and accessibility-first UI for medical data entry.
- ▌ Ecc Healthcare Eval Harness · undermybeltPatient safety evaluation harness for healthcare application deployments. Automated test suites for CDSS accuracy, PHI exposure, clinical workflow integrity, and integration compliance. Blocks deployments on safety failures.
- ▌ Ecc Ito Market Intelligence · undermybeltResearch prediction-market events, venues, underliers, liquidity, and news context for Itô basket workflows. Use for read-only market intelligence, API-gated Itô exploration, and source-grounded prediction-market briefings without investment advice or live trading.
- ▌ Ecc Kotlin Coroutines Flows · undermybeltKotlin Coroutines and Flow patterns for Android and KMP — structured concurrency, Flow operators, StateFlow, error handling, and testing.
- ▌ Ecc Kotlin Exposed Patterns · undermybeltJetBrains Exposed ORM patterns including DSL queries, DAO pattern, transactions, HikariCP connection pooling, Flyway migrations, and repository pattern.
- ▌ Ecc Network Bgp Diagnostics · undermybeltDiagnostics-only BGP troubleshooting patterns for neighbor state, route exchange, prefix policy, AS path inspection, and safe evidence collection.
- ▌ Ecc Springboot Verification · undermybeltVerification loop for Spring Boot projects: build, static analysis, tests with coverage, security scans, and diff review before release or PR.
- ▌ Ecc Swift Actor Persistence · undermybeltThread-safe data persistence in Swift using actors — in-memory cache with file-backed storage, eliminating data races by design.
- ▌ Ecc Workspace Surface Audit · undermybeltAudit the active repo, MCP servers, plugins, connectors, env surfaces, and harness setup, then recommend the highest-value ECC-native skills, hooks, agents, and operator workflows. Use when the user wants help setting up Claude Code or understanding what capabilities are actually available in their environment.
- ▌ 1start Mathmodel · undermybelt数学建模竞赛工作流入口。用于启动完整建模流程:询问用户偏好,生成 plan.md 和 todo.md,并按阶段调用赛题分析、建模、代码与图表、流程图、论文撰写、验证验收等 skills。
- ▌ Browser Cdp · undermybelt bundleUse this skill when you need to control a Chrome browser via CDP (Chrome DevTools Protocol) to reuse existing login sessions. Covers: launching Chrome in debug mode, opening URLs, waiting for page load, evaluating JavaScript, taking snapshots, and extracting auth tokens. Trigger phrases: browser automation, CDP, agent-browser, 浏览器操作, 操作浏览器, Chrome CDP, 复用登录态, extract token from browser.
- ▌ Story Cover · undermybelt bundle小说封面生成。根据书名、作者名自动分析题材风格,调用 GPT-Image-2 直接生成含标题和署名的专业级网文封面。 触发方式:/story-cover、/封面、「帮我做个封面」「生成封面图」「做个小说封面」「封面设计」
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- ▌ Hermes MCP Self Heal · undermybeltUse when Hermes MCP servers show failed or disconnected behavior and need structured self-heal: test each server, verify the backing listener or command, repair launchd persistence, and retest from Hermes.
- ▌ Skill YAML Audit Fix · undermybeltUse when auditing Hermes SKILL.md files for YAML/frontmatter breakage and repairing invalid frontmatter safely at scale.
- ▌ Ecc Agent Architecture Audit · undermybeltFull-stack diagnostic for agent and LLM applications. Audits the 12-layer agent stack for wrapper regression, memory pollution, tool discipline failures, hidden repair loops, and rendering corruption. Produces severity-ranked findings with code-first fixes. Essential for developers building agent applications, autonomous loops, or any LLM-powered feature.
- ▌ Ecc Autonomous Agent Harness · undermybeltTransform Claude Code into a fully autonomous agent system with persistent memory, scheduled operations, computer use, and task queuing. Replaces standalone agent frameworks (Hermes, AutoGPT) by leveraging Claude Code's native crons, dispatch, MCP tools, and memory. Use when the user wants continuous autonomous operation, scheduled tasks, or a self-directing agent loop.
- ▌ Ecc Customs Trade Compliance · undermybeltCodified expertise for customs documentation, tariff classification, duty optimization, restricted party screening, and regulatory compliance across multiple jurisdictions. Informed by trade compliance specialists with 15+ years experience. Includes HS classification logic, Incoterms application, FTA utilization, and penalty mitigation. Use when handling customs clearance, tariff classification, trade compliance, import/export documentation, or duty optimization.
- ▌ Ecc Flutter Dart Code Review · undermybeltLibrary-agnostic Flutter/Dart code review checklist covering widget best practices, state management patterns (BLoC, Riverpod, Provider, GetX, MobX, Signals), Dart idioms, performance, accessibility, security, and clean architecture.
- ▌ Ecc Healthcare Cdss Patterns · undermybeltClinical Decision Support System (CDSS) development patterns. Drug interaction checking, dose validation, clinical scoring (NEWS2, qSOFA), alert severity classification, and integration into EMR workflows.
- ▌ Ecc Laravel Plugin Discovery · undermybeltDiscover and evaluate Laravel packages via LaraPlugins.io MCP. Use when the user wants to find plugins, check package health, or assess Laravel/PHP compatibility.
- ▌ Ecc Latency Critical Systems · undermybeltUse for latency-sensitive systems such as realtime dashboards, market data, streaming agents, execution gateways, queues, caches, or HFT-like infrastructure where freshness and p95 latency matter.
- ▌ Ecc Network Interface Health · undermybeltDiagnose interface errors, drops, CRCs, duplex mismatches, flapping, speed negotiation issues, and counter trends on routers, switches, and Linux hosts.
- ▌ Ecc Team Agent Orchestration · undermybeltRun team-based orchestration for agent squads using work items, ownership, agent Kanban, merge gates, and control pane handoffs.
- ▌ Story Deslop · undermybelt bundle网文去AI味。检测并清除文本中的AI写作痕迹,让文字回归自然、有人味。 触发方式:/story-deslop、Hermes 路由名 `community/oh-story-claudecode/story-deslop`、slash command `/story-deslop`、/去AI味、「去AI味」「去味」「deslop」「这篇太AI了」
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- ▌ Memory Skills Cleanup · undermybelt全面清理 Hermes 记忆层 + skills 目录 + 路由引用。 当用户说"记忆太臃肿"、"清理记忆"、"优化记忆"、"skills太多"、"磁盘满了"时触发。
- ▌ Model Fallback Router · undermybeltApply the user's preferred model/API fallback strategy when task execution may require provider rotation, retries, failover, or token-efficient routing.
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- ▌ Paper Trading Eng Map · undermybeltMap an academic paper or formalization repo to concrete, implementable engineering changes in a trading/research engine. Avoid math gimmicks; focus on regime fusion, scoring, gating, and feature construction.
- ▌ Slash Command Routing · undermybeltRoute user intent to Hermes slash commands before normal tool or skill execution. Use when the request is really a session-control, backgrounding, planning, queueing, resume, rollback, config, or gateway command trigger.
- ▌ Ecc Healthcare Phi Compliance · undermybeltProtected Health Information (PHI) and Personally Identifiable Information (PII) compliance patterns for healthcare applications. Covers data classification, access control, audit trails, encryption, and common leak vectors.
- ▌ Ecc Homelab Network Readiness · undermybeltReadiness checklist for homelab VLAN segmentation, local DNS filtering, and WireGuard-style remote access before changing router, firewall, DHCP, or VPN configuration.
- ▌ Ecc Homelab Vlan Segmentation · undermybeltSegmenting home networks into VLANs for IoT, guest, trusted, and server traffic using UniFi, pfSense/OPNsense, and MikroTik — including switch trunk config, firewall rules, and wireless SSID mapping.
- ▌ Ecc Inventory Demand Planning · undermybeltCodified expertise for demand forecasting, safety stock optimization, replenishment planning, and promotional lift estimation at multi-location retailers. Informed by demand planners with 15+ years experience managing hundreds of SKUs. Includes forecasting method selection, ABC/XYZ analysis, seasonal transition management, and vendor negotiation frameworks. Use when forecasting demand, setting safety stock, planning replenishment, managing promotions, or optimizing inventory levels.
- ▌ Ecc Network Config Validation · undermybeltPre-deployment checks for router and switch configuration, including dangerous commands, duplicate addresses, subnet overlaps, stale references, management-plane risk, and IOS-style security hygiene.
- ▌ Ecc Recsys Pipeline Architect · undermybeltDesign composable recommendation, ranking, and feed pipelines using the six-stage Source→Hydrator→Filter→Scorer→Selector→SideEffect framework popularized by xAI's open-sourced For You algorithm. Use this skill whenever the user is building any system that picks "the top K items for a (user, context)" — social feeds, content CMSs, RAG rerankers, task prioritizers, notification triage, search reranking, ad ranking.
- ▌ Ecc Recursive Decision Ledger · undermybeltUse when the user asks for repeated rollouts, marked decision processes, high-dimensional search, stochastic optimization, local-optima exploration, ensemble comparison, or recursive reasoning with a visible evidence trail.
- ▌ Ecc Returns Reverse Logistics · undermybeltCodified expertise for returns authorization, receipt and inspection, disposition decisions, refund processing, fraud detection, and warranty claims management. Informed by returns operations managers with 15+ years experience. Includes grading frameworks, disposition economics, fraud pattern recognition, and vendor recovery processes. Use when handling product returns, reverse logistics, refund decisions, return fraud detection, or warranty claims.
- ▌ Ecc Swift Protocol Di Testing · undermybeltProtocol-based dependency injection for testable Swift code — mock file system, network, and external APIs using focused protocols and Swift Testing.
- ▌ Ecc Unified Notifications Ops · undermybeltOperate notifications as one ECC-native workflow across GitHub, Linear, desktop alerts, hooks, and connected communication surfaces. Use when the real problem is alert routing, deduplication, escalation, or inbox collapse.
- ▌ First Principles Thinking · undermybelt bundleSystematic first principles thinking for any problem domain. Use when the user says "analyze from first principles", "第一性原理", "从根本分析", "从零开始思考", "think from scratch", "question this design", "is this the right approach", "challenge assumptions", "挑战假设", "为什么要这样做", "有没有更好的方案", "why are we doing it this way", or needs to evaluate decisions, designs, or strategies without relying on analogies, conventions, or "best practices". Also triggers on "这个设计合理吗", "从本质上看", "回到基本面", "what's really true here", "what are we assuming", or any request to decompose a problem to its fundamentals.
- ▌ Decision Surface Layer · undermybeltHermes 中文优先的决策面技能:把“主目标、偏好权重、硬约束、取舍规则”单独落成用户可改文件, 不再埋在提示词里。适用于方案很多、取舍复杂、用户偏好稳定、执行前必须先定方向的任务。
- ▌ Gap Driven Repo Implmn · undermybeltIdentify project gaps, search GitHub for reference implementations, translate/adapt to target language, integrate with tests
- ▌ Karpathy Coding Dscpln · undermybelt bundleCompact coding-discipline overlay for Hermes based on Karpathy-inspired guidelines: think before coding, simplicity first, surgical changes, and goal-driven verification. Use when doing non-trivial code edits, reviews, refactors, or debugging where overengineering, hidden assumptions, or diff sprawl are risks.
- ▌ Magika File Type Dtctn · undermybelt bundleUse Google Magika for fast ML-based file-type detection from file bytes, not just extensions or MIME. Use when the user needs reliable file identification, suspicious upload triage, content-type validation, malware-prep filtering, or bulk file classification.
- ▌ Coding Agent Delegation · undermybelt bundleUse when delegating implementation, refactoring, PR review, or long-running coding work to external coding-agent CLIs such as Claude Code, Codex, OpenCode, or a Kanban-isolated agent lane.
- ▌ Ecc Agent Harness Construction · undermybeltDesign and optimize AI agent action spaces, tool definitions, and observation formatting for higher completion rates.
- ▌ Ecc Android Clean Architecture · undermybeltClean Architecture patterns for Android and Kotlin Multiplatform projects — module structure, dependency rules, UseCases, Repositories, and data layer patterns.
- ▌ Ecc Content Hash Cache Pattern · undermybeltCache expensive file processing results using SHA-256 content hashes — path-independent, auto-invalidating, with service layer separation.