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Agent OS
Brian Casel's system for discovering and injecting codebase standards and shaping specs; v3 defers spec writing to agents' plan mode and drops its own task/implementation orchestration.
v3.0.0 released 2026-01-20 (refocused on standards, retired implementation phases); repo pushed 2026-10-07 (checked 2026-10-25)
In Spec-driven development
Where it stands apart
- After implementation, what built-in step keeps specs and code aligned? (if several, the first that applies) nothing built in (22% of 18 others)
- By default, once a plan is approved, how is implementation run? it does not run implementation (6% of 18 others)
What it shares with most of the community
- Is it actively maintained? active (74% of 19 others)
- How is the main thing licensed? permissive open source (MIT/Apache/BSD) (74% of 19 others)
- How is it mainly sustained? company with a paid product, tier, or ads (50% of 18 others)
- Can it run entirely on your own device or infrastructure, without the maker's servers? yes (79% of 19 others)
- Do you need an account to use it? no account (74% of 19 others)
- Who is it for? developers (100% of 19 others)
- Once code exists, what is the spec? a planning scaffold: code becomes the truth after implementation (53% of 19 others)
- What format are specs written in? markdown from templates or free-form (67% of 18 others)
- Where do specs live? plain files in the project repository (89% of 19 others)
- Which coding agents does it work with? many agents (five or more) (78% of 18 others)
- What does it offer teams beyond sharing files in git? (if both, pick the paid product) nothing beyond git (50% of 18 others)
Nearest neighbors
- GSD (Get Shit Done) / GSD Core 81% of 16 shared answers match
- AGENTS.md 71% of 17 shared answers match
- BMAD Method 71% of 17 shared answers match
Every answer
| Question | Answer | Source |
|---|---|---|
| Is it actively maintained? | active | source 2026-10-25 |
| How is the main thing licensed? | permissive open source (MIT/Apache/BSD) MIT | source 2026-10-25 |
| How is it mainly sustained? | company with a paid product, tier, or ads Free; Builder Methods Pro paid membership for support/community. | source 2026-10-25 |
| Can it run entirely on your own device or infrastructure, without the maker's servers? | yes | source 2026-10-25 |
| Do you need an account to use it? | no account Free open-source repo with install scripts; no login. Docs site asks for an email for instructions, not an account. | source 2026-10-26 |
| Who is it for? | developers | source 2026-10-25 |
| Which shared standard or format does it mainly build on? | none of these (its own format or interface) Its own standards and spec folders in plain markdown; defers to agents' plan mode. | source 2026-10-26 |
| Once code exists, what is the spec? | a planning scaffold: code becomes the truth after implementation v3: /shape-spec saves plan-mode output to a spec folder; the durable artifact is standards, not specs. | source 2026-10-25 |
| After implementation, what built-in step keeps specs and code aligned? (if several, the first that applies) | stands apart nothing built in Sync script syncs standards to profiles, not specs to code. | source 2026-10-25 |
| What format are specs written in? | markdown from templates or free-form | source 2026-10-25 |
| Where do specs live? | plain files in the project repository | source 2026-10-25 |
| Which coding agents does it work with? | many agents (five or more) Claude Code (full), Cursor, Windsurf, Codex, Antigravity, 'any AI assistant that can read files'. | source 2026-10-25 |
| What form does it mainly ship in? | prompts, skills, or slash commands installed into an agent (even if a CLI installs them) Shell install of commands and standards files. | source 2026-10-25 |
| How is the path from idea to code structured? | no fixed phases Discover / Inject / Shape are independent tools. | source 2026-10-25 |
| Does a human approve the spec or plan before code is written? | review is recommended but not enforced Uses agent plan mode, where the user accepts the plan. | source 2026-10-25 |
| By default, once a plan is approved, how is implementation run? | stands apart it does not run implementation 'Implementation/orchestration phases retired'. | source 2026-10-25 |
| What does it offer teams beyond sharing files in git? (if both, pick the paid product) | nothing beyond git Profiles/standards shared as files; a team plan is mentioned without details. | source 2026-10-25 |
Sources
This page was derived from:
- GitHub · github.com/buildermethods/agent-os · read 2026-10-25
- GitHub · github.com/buildermethods/agent-os/blob/main/CHANGELOG.md · read 2026-10-25
- GitHub · github.com/buildermethods/agent-os/releases · read 2026-10-25
- Web page · buildermethods.com/agent-os · read 2026-10-25
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