build-s1a-agent SKILL.md skillA
build-s1a-agent from thinkflowlab/system1-agents is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add thinkflowlab/system1-agents/build-s1a-agent@git:20261006.bcc6793Pins git:20261006.bcc6793 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- thinkflowlab/system1-agents
- Path
.claude/skills/build-s1a-agent/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261006.bcc6793, committed Oct 6, 2026
- First version recorded
- Sep 22, 2026
- Size
- 6,620 bytes
- Repository stars
- 164
- License
- Apache-2.0
Build a new System 1 agent (an openJiuwen agent with a System 1 decision model in its model slot) for a task the user names, in this repository. Runs a fit probe first, then scaffolds one agent module from the template of the right front (tool, browser or rail), its test and its README row, and verifies it model by model. Use when the user asks to build, add or scaffold a System 1 agent, an S1A agent, a Jev agent, a new game, task, site or rail for s1a.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Build a System 1 agent A System 1 agent is one module under `s1a/agents/` that ends in a frozen `SPEC`. The loop, the decision-model layer, the rethink rail, the job folders and the CLI are shared and never change for a new agent. This skill produces the module, its test and a README row, and stops at the first gate that fails. Read `references/fit-rule.md` before the intake and `references/state-design.md` before the scaffold. The three fronts and every spec field are in `references/fronts.md`. ## 1. Intake, one message Ask for, or confirm from the request, these five facts. Stop until they are clear. 1. The task, in one sentence, and what a finished episode looks like. 2. Where the state comes from: an API or library, a page, a text environment, a callback in a running agent. 3. How the options are enumerated at each step: the library's legal moves, the page's controls, a fixed list. 4. The score: what counts, and whether a baseline exists (a rule, an expert plan, a published number). 5. Whether any step needs arithmetic, constraint deduction, search, or generated text. One yes is a stop. ## 2. Fit gate, before any code …
Read the whole file at its exact version.
How to install
mdr add thinkflowlab/system1-agents/build-s1a-agent@sha256:b92990851a3e5871The line at the top of this page pins the label git:20261006.bcc6793, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_fjwe5vnds2tvjfwa)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 22, 2026 and Oct 6, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261006.bcc6793 latest | 2026-10-06 | bcc6793 | 6,620 B | A | view · diff |
| git:20261006.7c7e3be | 2026-10-06 | 7c7e3be | 6,259 B | A | view · diff |
| git:20261006.c60cb3e | 2026-10-06 | c60cb3e | 6,052 B | A | view · diff |
| git:20260923.d2024a1 | 2026-09-23 | d2024a1 | 5,305 B | A | view · diff |
| git:20260922.c79697f | 2026-09-22 | c79697f | 5,319 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6620 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
thinkflowlab/system1-agents · 164 stars · license Apache-2.0 · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fjwe5vnds2tvjfwa GET https://markdownregistry.com/api/v1/resolve?ref=thinkflowlab/system1-agents/build-s1a-agent GET https://markdownregistry.com/api/v1/blob/b92990851a3e5871a258f5b741bfdd8b0b4445b55352d0eb2ca59214359ff405
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.