Effective Agent by Sebastian Software View on GitHub

Open-source skills for AI agents

Better judgment.
From idea to market.

Seven connected skills for product decisions, web design, engineering, delivery, marketing, writing, and image workflows. Bring professional depth to the task in front of you, from a first brief to a growing business.

Find your first skill See installation
Engineering depth Rust TypeScript
effective skills
7
focused references
378
optional instruction packs
2
Tuned for GPT-6 — Sebastian Software Tuned for Opus 5.5 — Sebastian Software
Tuned by Sebastian Software. What this means
The collection at a glanceSeven skills. Shared standards.
  1. 01ProductDecide what is worth building
  2. 02WebDesign the whole experience
  3. 03EngineeringBuild sound systems and code
  4. 04DeliveryReview, verify, and ship changes
  5. 05MarketingReach customers and grow
  6. 06WritingMake the thinking clear
  7. 07ImageRefine the authentic shoot

Use one on its own. Connect them when the work calls for it.

Try one discipline npx skills add sebastian-software/effective-agent --skill effective-web
Install one discipline Ask in normal language Load only relevant guidance Inspect every workflow Verify before done

Choose by need

What do you need your agent to do?

Start with a real task. Each skill brings focused guidance, concrete checks, and a clear remit. These examples show where to begin and what kind of work each one supports.

Pick the outcome

Effective ProductStart with · Research, notes, or a brief

Choose the next product move.

An example request

“Compare these customer interviews with our roadmap. Which problem should we tackle next, and what would change that decision?”
What the guidance adds Evidence before commitment

Separate observations from assumptions; compare options and identify what still needs learning.

Inside this skill
  • Customer research, competitive profiles & discovery
  • Strategy, scope, prototypes & release decisions
  • Product and service pricing, naming & decision records
Explore Effective Product
Work toward

A product recommendation with evidence, tradeoffs, and a focused next step.

  1. 01Evidence first

    Start from the repository, research, or source material. Keep unsupported assumptions visible.

  2. 02Depth on demand

    Load the route and references that fit. Keep specialist detail available without making every task a deep dive.

  3. 03Your intent leads

    Respect the requested scope and style. Carry existing authorization forward and keep publication explicit.

  4. 04Proportionate rigor

    Match checks and reporting to the risk. A small question can get a direct answer; a complex change gets deeper review.

A useful first discipline

Give your agent a real web task and the repository it belongs to.

Explore Effective Web
npx skills add sebastian-software/effective-agent --skill effective-web

From one discipline to a workflow

Connected work. Clear responsibilities.

Product owns the decision. Web and Engineering shape the experience and the system. Delivery carries repository changes through review. Marketing takes value to market; Writing makes the thinking clear. Use the combination your task needs.

  1. 01

    Decide

    Make the right product call.

    Gather the evidence, then turn it into direction, scope, priorities, pricing, names, and durable decisions.

    Effective Product
  2. 02

    Create

    Build it as one system.

    Connect the browser experience with the architecture, data, and code underneath it.

    Effective Web Effective Engineering
  3. 03

    Improve & deliver

    Move repositories forward with evidence.

    Coordinate, audit, modernize, document, port, update dependencies, review, and deliver without losing correctness or context.

    Effective Delivery
  4. 04

    Reach

    Reach customers. Make the value clear.

    Connect positioning and content with acquisition, consultative sales, CRM, and service growth. Keep editorial and team writing in the right voice, and refine existing portraits without losing their shoot character.

    Effective Marketing Effective Writing Effective Image

The broadest discipline

Frontend work rarely stays in one discipline.

Effective Web routes broad frontend work through the smallest relevant guidance set, then checks the result across design, implementation, accessibility, performance, and verification boundaries.

26intent routes
137focused references
1coherent quality bar
Explore Effective Web
Design planning & review Accessibility React architecture Forms UX Performance CSS architecture Typography Frontend SEO & AI search Motion SVG Data tables Testing Auth UX Internationalization & RTL Web-to-print

Seven practical skills

The full collection. Choose your starting point.

Every discipline has a human-facing overview, an explicit trigger, a routing table, clear boundaries, and its own selective install path.

Product01

Effective Product

Decide what to build and how it should work: research, discovery, service pilots, strategy, scope, design modeling, product and service pricing, naming, and decision records.

  • 11 intent routes
  • Evidence before answers
Explore skill
Web02

Effective Web

Design, build, review, and improve production web experiences as one connected system, from reference capture to compliance.

  • 26 routed workflows
  • Design to verification
Explore skill
Engineering03

Effective Engineering

Design and write the software itself: architecture, data models, TypeScript and Rust depth, focused tests, and benchmark methodology.

  • 10 intent routes
  • Architecture through focused tests
Explore skill
Delivery04

Effective Delivery

Move an existing repository and the team around it forward: audits, ports, PR review, delegated issue queues, dependencies, checks, docs, and leadership.

  • 10 intent routes
  • Authority stays explicit
Explore skill
Writing05

Effective Writing

Write and revise articles, technical explainers, and team messages: argument structure, requested voice, AI-pattern audits, natural US team English, and locale typography.

  • 7 intent routes
  • Preserves meaning and qualifications
Explore skill
Marketing06

Effective Marketing

Position and sell products or services: messaging, content strategy, launch, commercial copy, conversion, service growth, outbound, consultative sales, paid campaigns, CRM, social, and consultant profiles.

  • 18 intent routes
  • Claims trace to proof
Explore skill
Image07

Effective Image

Focused image workflows, starting with business portrait retouch: natural faces, smoother clothing, clearer glasses, and consistent shoot color.

  • Business Portrait Retouch route
  • Reusable Imagegen editing prompt
Explore skill

Why these skills exist

Expertise you can inspect.

Read the guidance, see where each discipline begins and ends, and adapt it to your team. The collection is open source under MIT or Apache-2.0.

See how we review skills
  1. 01

    Professional depth

    Guidance spans architecture and implementation, product decisions, design review, writing, and the commercial work of growing a service business.

  2. 02

    Inspectable sources

    Read every skill and reference in the repository. Trace recommendations to the code, research, or source material behind the task.

  3. 03

    Clear ownership

    Each discipline names its remit and the neighboring skill that owns a different decision. Engineering and delivery have distinct jobs.

  4. 04

    Focused context

    Short entry points route into specialist references as needed. Print calibration, review voice, or an advanced Rust topic can stay out of unrelated tasks.

  5. 05

    Reviewable guidance

    Routing cases, behavioral scenarios, and repository checks help catch drift. Results still depend on the model, tools, task, and available evidence.

Optional standing instructions

Set the defaults. Keep the skills independent.

Skills help with a particular kind of work. Two optional instruction packs add conventions across tasks. Enable them separately in your agent setup; every skill works without them.

Request and completion
Honor the requested scope, preserve existing authorization, and carry the work through a truthful handoff.
Documentation truth
Keep documentation aligned with observable behavior, current implementation, and explicit uncertainty.
Read the collection boundary

Start with one. Grow deliberately.

Start with the skill your next task needs.

Both the skills CLI and DALO support selective installation. You do not need to adopt the full collection to use one skill.

01

Quick install

skills CLI

Add one skill to an agent environment that supports Agent Skills.

npx skills add sebastian-software/effective-agent --skill effective-web

Replace effective-web with any skill name, or pass --all.

02

Managed setup

DALO

Install DALO, initialize its configuration, link an agent target, and pin the reviewed selection.

curl -fsSL https://dalo.sh/install.sh | sh dalo init dalo target link codex dalo source add-catalog sebastian https://github.com/sebastian-software/effective-agent.git dalo source select sebastian effective-web dalo approve skill sebastian:effective-web dalo sync

This installs Effective Web. Add standing instructions only if you want them.

Optional: add the instruction packs

Requires a DALO release with source-backed instruction packs.

dalo instructions enable sebastian:request-and-completion --target codex dalo instructions enable sebastian:documentation-truth --target codex

Want to manage pinned skills and optional instructions across agents?

Read the DALO setup guide

Built in the open

Professional practice, made portable.

Sebastian Software builds and supports open-source software and helps teams design, modernize, and ship ambitious software products. This collection turns that practical experience into inspectable, reusable agent workflows.

Explore our open-source work Work with us