mars-agents 0.8.9

Agent package manager for .agents/ directories

mars

A package manager for AI agent profiles and skills. Install agents and skills from git sources into Claude Code, Codex, OpenCode, Cursor, and other agent harness config directories.

Target Status

Mars materializes harness-native artifacts for multiple targets:

Target	Status	Notes
.claude	First-class	Claude Code agents, skills, MCP, hooks, and settings surfaces.
.codex	First-class	Codex project instruction and agent-facing surfaces.
.opencode	First-class	OpenCode agent and permission surfaces.
.cursor	Experimental	Cursor CLI/config support exists, but semantics can change as Cursor's agent surface evolves.
.pi	Future first-class	Meridian-owned Pi flavor and extension surface; under active design/development.

Install

Method	Command
Cargo	cargo install mars-agents
pip / uv	uv tool install mars-agents or pip install mars-agents
npm	npm install -g @meridian-flow/mars-agents
Prebuilt binaries	GitHub Releases

Quick Start

mars init
mars add meridian-flow/meridian-dev-workflow
mars link .claude
mars link .codex

Your agents and skills are now installed and available in both Claude Code and Codex. Update them with mars upgrade, check for drift with mars doctor.

Adding Sources

# From GitHub
mars add meridian-flow/meridian-base
mars add acme/security-agents --only-agents

# From a local directory
mars add ../my-team-agents

# Pin a version
mars add meridian-flow/meridian-base@^1.0

Model Aliases

Packages can distribute model routing — short names that resolve to concrete models across harnesses:

mars models list
mars models resolve opus

# In mars.toml — override any alias
[models.opus]
harness = "claude"
provider = "Anthropic"
match = ["*opus*"]

How It Works

flowchart TD
    sources["mars.toml + mars.lock<br/><i>committed</i>"]
    local[".mars-src/<br/><i>your own agents, skills, MCP, hooks</i>"]
    git["git sources<br/><i>resolved from mars.toml</i>"]

    canonical[".mars/<br/><i>canonical store, gitignored</i>"]
    agents["agents/ + skills/"]
    mcp["mcp servers"]
    hooks["lifecycle hooks"]

    claude[".claude/"]
    codex[".codex/"]
    cursor[".cursor/"]
    opencode[".opencode/"]

    sources --> |mars sync| canonical
    local --> canonical
    git --> canonical

    canonical --- agents
    canonical --- mcp
    canonical --- hooks

    canonical --> |mars link| claude
    canonical --> |mars link| codex
    canonical --> |mars link| cursor
    canonical --> |mars link| opencode

Mars resolves the full dependency graph before touching any files. Writes are atomic. The lock file tracks what mars manages so it never touches your files. Each linked target gets harness-native artifacts — agents, skills, MCP servers, and hooks compiled to match what that tool expects.

Use mars adopt to bring an existing unmanaged file into .mars-src/ in one step.

Docs

• Config — mars.toml, agent profiles, compilation, MCP/hooks
• CLI — every command with flags and examples
• Internals — sync pipeline, lock file, conflicts
• Dev — local development, troubleshooting, smoke testing

License

MIT