meridian

Orchestrate AI coding agents across Claude Code, Codex, and OpenCode. Each model runs through its native harness — meridian coordinates between them.

Early development. Meridian is not stable. Expect breaking changes in any release. If you need a stable workflow, this project is not ready for you yet.

Why

Claude Code is (supposed to be) the best way to run Claude. Codex CLI is often the best way to run GPT. Each provider's harness is optimized for their models — sandboxing, tool use, context handling, everything (supposedly).

But you can only use one at a time.

Meridian lets agents spawn other agents across harnesses. The right model for each task, through the right runtime, with clean context per spawn.

Install

uv tool install meridian-cli
Other methods 
pipx install meridian-cli
pip install meridian-cli

From source:

git clone https://github.com/haowjy/meridian-cli.git
cd meridian-cli
uv tool install --force . --no-cache --reinstall

You need at least one harness installed: Claude Code, Codex CLI, or OpenCode.

Set Up a Project

meridian init by itself only bootstraps Meridian project config:

meridian init

To initialize Mars package content in the same step, use setup flags:

meridian init --add haowjy/meridian-dev-workflow --link .claude

For first-run onboarding, bootstrap can do setup + launch in one command:

meridian bootstrap --add haowjy/meridian-dev-workflow --link .claude

--add / --link setup flags cannot be combined with --dry-run.

Usage

Launch an interactive session:

meridian

Or spawn agents directly:

# Code on Codex, review on Claude
meridian spawn -a coder -p "Add rate limiting to the API endpoints"
meridian spawn -a reviewer --from p1 -p "Review the rate limiting implementation"

# Check on work
meridian spawn list
meridian spawn show p1

Agents route to their configured model and harness automatically. Each spawn gets a fresh context window with only the context it needs.

Architecture

graph TB
    User([You]) --> Primary["meridian<br/>(primary session)"]

    subgraph Packages
        Sources["git sources"] -->|"mars add/sync"| Store[".mars/"]
        Store -->|"materialize targets"| Tool[".claude/ · .cursor/ · .codex/ · .opencode/ · .pi/"]
    end

    subgraph Runtime
        Primary -->|"meridian spawn"| Router{"Model router"}
        Router --> Claude["Claude Code"]
        Router --> Codex["Codex CLI"]
        Router --> OpenCode["OpenCode"]
    end

    subgraph State[".meridian/"]
        Spawns["spawns + reports"]
        Sessions["sessions"]
        Work["work items"]
    end

    Agents --> Primary
    Primary --> State
    Claude & Codex & OpenCode -->|"meridian CLI"| State

Agent Packages

meridian-dev-workflow — A dev team: architects, coders, reviewers, testers, researchers, documenters, and the orchestrators that coordinate them.

meridian-base — Core coordination primitives. Included as a dependency of meridian-dev-workflow.

Docs

Development

uv sync --extra dev
uv run ruff check .
uv run pytest-llm
uv run --extra dev python -m pyright

See DEVELOPMENT.md for full dev setup.

Contributing

This project is not accepting external contributions at this time. The maintainer is keeping it closed to outside contributions until the codebase is stable enough to support them well. Bug reports and feedback are welcome as GitHub issues.

License

Apache 2.0

Project links

Data verified by PyPI on Jun 25, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (0.4.3)

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for haowjy from gravatar.com haowjy

GitHub Statistics

Data verified by PyPI on Jun 25, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (MIT)

Requires

Python >=3.12

Provides Extra

app dev templates

Classifiers

Report project as malware

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

meridian_cli-0.3.18.tar.gz (884.4 kB view details)

Uploaded Source

Built Distribution

If you're not sure about the file name format, learn more about wheel file names.

meridian_cli-0.3.18-py3-none-any.whl (1.1 MB view details)

Uploaded Python 3

File details

Details for the file meridian_cli-0.3.18.tar.gz.

File metadata

  • Download URL: meridian_cli-0.3.18.tar.gz
  • Upload date:
  • Size: 884.4 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for meridian_cli-0.3.18.tar.gz
Algorithm Hash digest
SHA256 1f789c59ec8ec9fcf6aea62903cb4f88b54e2a399cbbf7da81af3dc68e35d4ec
MD5 0efe52ac4dc7a8ffe254b4c6edb6a38d
BLAKE2b-256 9a049f281264cccf6bf4da3f012d17f55b4281b65e2732013a5d04f23a85c3d3

See more details on using hashes here.

Provenance

The following attestation bundles were made for meridian_cli-0.3.18.tar.gz:

Publisher: release.yml on haowjy/meridian-cli

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file meridian_cli-0.3.18-py3-none-any.whl.

File metadata

  • Download URL: meridian_cli-0.3.18-py3-none-any.whl
  • Upload date:
  • Size: 1.1 MB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? Yes
  • Uploaded via: twine/6.1.0 CPython/3.13.12

File hashes

Hashes for meridian_cli-0.3.18-py3-none-any.whl
Algorithm Hash digest
SHA256 80955de7e38e19f6efc93bc374f7521a07d54aedab0ccebfc604cacf929380bc
MD5 f2f5236e7d1ebd0e3ffaa38bf45d952c
BLAKE2b-256 0e1790135df976fd79622a451cdbc19158a4480ddfdda6ebfd9b499beaeff6b5

See more details on using hashes here.

Provenance

The following attestation bundles were made for meridian_cli-0.3.18-py3-none-any.whl:

Publisher: release.yml on haowjy/meridian-cli

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

0.4.3

2 files

0.4.2

2 files

0.4.1

2 files

0.4.0

2 files

0.3.55

2 files

0.3.54

2 files

0.3.53

2 files

0.3.52

2 files

0.3.51

2 files

0.3.50

2 files

0.3.49

2 files

0.3.48

2 files

0.3.47

2 files

0.3.46

2 files

0.3.45

2 files

0.3.44

2 files

0.3.43

2 files

0.3.42

2 files

0.3.41

2 files

0.3.40

2 files

0.3.39

2 files

0.3.38

2 files

0.3.37

2 files

0.3.36

2 files

0.3.35

2 files

0.3.34

2 files

0.3.33

2 files

0.3.32

2 files

0.3.31

2 files

0.3.30

2 files

0.3.29

2 files

0.3.28

2 files

0.3.27

2 files

0.3.26

2 files

0.3.25

2 files

0.3.24

2 files

0.3.23

2 files

Pre-release

0.3.23rc1

2 files

0.3.22

2 files

0.3.21

2 files

0.3.20

2 files

0.3.19

2 files

This release

0.3.18 This release

2 files

0.3.17

2 files

0.3.16

2 files

0.3.15

2 files

0.3.14

2 files

0.3.13

2 files

0.3.12

2 files

0.3.10

2 files

0.3.9

2 files

0.3.8

2 files

0.3.7

2 files

0.3.6

2 files

0.3.5

2 files

0.3.4

2 files

0.3.3

2 files

0.3.2

2 files

0.3.1

2 files

0.3.0

2 files

0.2.32

2 files

0.2.31

2 files

0.2.30

2 files

0.2.29

2 files

0.2.28

2 files

0.2.27

2 files

0.2.26

2 files

0.2.25

2 files

0.2.24

2 files

0.2.23

2 files

0.2.22

2 files

0.2.20

2 files

0.2.19

2 files

0.2.18

2 files

0.2.17

2 files

0.2.16

2 files

0.2.15

2 files

0.2.14

2 files

0.2.13

2 files

0.2.12

2 files

0.2.11

2 files

0.2.10

2 files

0.2.9

2 files

0.2.8

2 files

0.2.7

2 files

0.2.6

2 files

0.2.5

2 files

0.2.4

2 files

0.2.3

2 files

0.2.2

2 files

0.2.1

2 files

0.2.0

2 files

Pre-release

0.1.14rc5

2 files

Pre-release

0.1.14rc4

2 files

Pre-release

0.1.14rc3

2 files

Pre-release

0.1.14rc2

2 files

Pre-release

0.1.14rc1

2 files

Pre-release

0.1.13rc2

2 files

0.1.12

2 files

0.1.11

2 files

0.1.10

2 files

0.1.9

2 files

0.1.7

2 files

0.1.2

2 files

0.1.1

2 files

0.1.0

2 files

0.0.49

2 files

0.0.48

2 files

Pre-release

0.0.48rc1

2 files

0.0.47

2 files

0.0.45

2 files

0.0.44

2 files

0.0.42

2 files

0.0.40

2 files

0.0.39

2 files

Pre-release

0.0.39rc1

2 files

0.0.38

2 files

Pre-release

0.0.38rc4

2 files

Pre-release

0.0.38rc3

2 files

Pre-release

0.0.38rc2

2 files

Pre-release

0.0.38rc1

2 files

0.0.37

2 files

0.0.36

2 files

0.0.35

2 files

Pre-release

0.0.35rc5

2 files

Pre-release

0.0.35rc4

2 files

Pre-release

0.0.35rc3

2 files

Pre-release

0.0.35rc2

2 files

Pre-release

0.0.35rc1

2 files

0.0.32

2 files

0.0.31

2 files

0.0.30

2 files

0.0.29

2 files

0.0.28

2 files

0.0.27

2 files

0.0.26

2 files

0.0.25

2 files

Anthropic, PBC Visionary sponsor Bloomberg Visionary sponsor Hudson River Trading Visionary sponsor Meta Visionary sponsor NVIDIA Visionary sponsor Microsoft Sustainability sponsor Depot Continuous Integration AWS Cloud computing and Security Sponsor Datadog Monitoring Fastly CDN Google Download Analytics Sentry Error logging StatusPage Status page