Declarative AI agent
environment manager.

カセット — cassette. plug in, swap out, share.

Read the docs Star on GitHub

~/dev/kasetto

❯kasetto

SIDE AGET STARTED · FEATURES · EXAMPLE

A1QUICKSTART

INSTALL

curl -fsSL kasetto.dev/install | sh

GITHUB117v3.6.0github.com/pivoshenko/kasetto ↗

DOCSkasetto.dev/docs ↗

A2FEATURES

DECLARATIVE

One YAML file — skills, commands, MCPs, and instructions. Apply globally or per project; compose with `extends`.

ENTERPRISE & PRIVATE REPOSITORIES

Pull from GitHub, GitLab, Bitbucket, or self-hosted repos, public or private. Secrets resolve from `kst_*` placeholders at sync time, so they're never committed or locked.

MULTI-AGENT

Write once, ship everywhere. Claude Code, Cursor, Codex, Copilot — one sync keeps every agent current.

SKILLS, COMMANDS, MCPS & INSTRUCTIONS

All four asset kinds from one source, transformed into each agent's native format and auto-merged. Share tools and prompts like a repo link.

SPEED

Built in Rust. Content is hashed and diffed against a lock file, so only what changed is touched — syncs finish in seconds.

UNIVERSAL

One static binary for macOS, Linux, and Windows. JSON output and real exit codes — same behavior on your laptop or in CI.

A3SECRET SOURCES

Environment

${kst_VERCEL_TOKEN}

credentials.yaml

${kst:crd:vercel/token}

1Password

${kst:op:Private/Vercel/token}

HashiCorp Vault

${kst:vault:secret/app#token}

KeePass

${kst:kp:Vercel/API#Password}

AWS Secrets Manager

${kst:aws:prod/db#password}

Google Secret Manager

${kst:gcp:db-password}

Azure Key Vault

${kst:az:my-vault/db}

pass / gopass

${kst:pass:work/vercel}

macOS Keychain

${kst:keychain:vercel-token}

A4EXAMPLE

kasetto.yaml

1# Option A: preset destination by agent (see README for supported agent values)

2agent:

3 - codex

4 - claude-code

6# Option B: manual destination (takes precedence if both are set)

7# destination: ./.agents/skills

9skills:

10 # "*" syncs every skill in the source — each is a directory with a SKILL.md,

11 # discovered in the source root or its skills/ subdirectory

12 - source: github.com/vercel-labs/next-skills

13 # ref: v1.0.0 # pin to a tag or commit; omit to track the default branch

14 skills: "*"

16 # or list skills by name

17 - source: github.com/anthropics/skills

18 skills:

19 - doc-coauthoring

20 - frontend-design

21 - pptx

23 # sub-dir: resolve the named skills under this path, e.g. skills/productivity/grill-me/

24 - source: github.com/mattpocock/skills

25 sub-dir: skills/productivity

26 skills:

27 - grill-me

28 - caveman

30 # path: a skill in a non-standard location → <path>/<name>/, here skills/engineering/improve-codebase-architecture/

31 - source: github.com/mattpocock/skills

32 skills:

33 - name: improve-codebase-architecture

34 path: skills/engineering

36commands:

37 # names resolve to commands/<name>.md in the source (nested dirs namespace, e.g. git:commit)

38 - source: github.com/gsd-build/get-shit-done

39 commands:

40 - gsd: explore

41 - gsd: fast

43instructions:

44 # instructions wire CLAUDE.md / .cursor/rules / AGENTS.md etc. from instructions/<name>.{md,mdc}

45 # "*" syncs every instruction; aggregate files (CLAUDE.md, AGENTS.md) get managed blocks

46 - source: github.com/pivoshenko/pivoshenko.ai

47 instructions:

48 - docs-autoupdate

49 - multi-agent-dispatch

51mcps:

52 # names resolve to mcps/<name>.json in the source

53 - source: github.com/pivoshenko/pivoshenko.ai

54 branch: main # track a specific branch (use ref: to pin a tag or commit)

55 mcps:

56 - github

57 - vercel

58 - kaggle

SIDE BAGENTS · INSTALL

B1SUPPORTED AGENTS

22 PRESETS, BUILT IN

CLAUDE CODE

CURSOR

CODEX

ANTIGRAVITY

B2INSTALL

MACOS / LINUX

curl -fsSL kasetto.dev/install | sh

WINDOWS (POWERSHELL)

powershell -ExecutionPolicy Bypass -c "irm kasetto.dev/install.ps1 | iex"

HOMEBREW

brew tap pivoshenko/tap
brew trust pivoshenko/tap
brew install kasetto

CARGO

cargo install kasetto

Declarative AI agent environment manager.

Declarative AI agent
environment manager.