How do I install the Agent S Foundation skill?

Run npx skillmds@latest add ryan-brosas/agent-s-foundation in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Agent S Foundation safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Agent S Foundation?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Agent S Foundation free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Agent S Foundation?

ryan-brosas (@ryan-brosas) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Agent S Foundation by ryan-brosas — Agent Skill

Name: Agent S Foundation
Author: ryan-brosas

Agent S Foundation

Use when porting screenshot-driven computer-use agents — grounding-model coordinate generation, eval-based grounded-action execution, code-agent delegation with step budgets, behavior-narrator trajectory annotation, or Best-of-N comparative judging.

ryan-brosas f50e4f1 24 files · 80.5 KB Updated Sep 17, 2026

File contents

Agent-S (gui_agents/s3): AgentS3 minimal GUI-agent loop foundations

Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is historical, revision-pinned evidence rather than timeless guidance. Current project source, tests, requirements, and runtime behavior outrank this projection and decide what ships.

Provenance and revision

Source record: agent-s; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
Recorded revision: main@bffdb59c60cbbb38c3a190b2e91da12039e4063c.
Full provenance, coverage caveats, boundaries, and preserved evidence: references/index.md.

Topic map

Representative topics: Worker spine; Code delegation; LLM plumbing; Grounding & actions; Trajectory judging (BoN); Local execution.
Scope and retrieval questions: references/index.md#use-this-for.
Complete capsule chooser: references/index.md#load-the-matching-source-dump.
Detailed grouped map: references/index.md#capsule-map.
Source limitations and portability boundaries: references/index.md#boundaries.

Retrieval

Open the index, choose one capsule matching the active question, and load only that capsule. Revalidate its cited source and revision before relying on it. Do not bulk-load the inventory, treat historical claims as current truth, or apply this foundation as a procedure.

Frequently asked questions