Agentsync

CI Release Catalog E2E License: MIT GitHub release Codecov Quality Gate Status Bugs Code Smells Coverage Duplicated Lines (%) Lines of Code Reliability Rating Security Rating Technical Debt Maintainability Rating Vulnerabilities

A fast, portable CLI tool for synchronizing AI agent configurations and MCP servers across multiple AI coding assistants using symbolic links.

How AgentSync works at a glance: many AI tools expect different config locations, so AgentSync turns .agents/ into one source of truth and syncs it everywhere.

flowchart LR
    subgraph Problem[Problem: fragmented AI tool setup]
        Claude[Claude Code]
        Gemini[Gemini CLI]
        Cursor[Cursor]
        Copilot[GitHub Copilot]
        Codex[OpenAI Codex]
        OpenCode[OpenCode]
    end

    Chaos[Scattered config files<br/>Duplication and drift]
    Source[.agents/<br/>Single source of truth]
    Sync[AgentSync<br/>Rust CLI + npm wrapper]
    Output[Symlinks + MCP config<br/>for each assistant]
    Result[Update once<br/>Sync everywhere]

    Claude --> Chaos
    Gemini --> Chaos
    Cursor --> Chaos
    Copilot --> Chaos
    Codex --> Chaos
    OpenCode --> Chaos

    Chaos -->|replace with| Source
    Source --> Sync
    Sync --> Output
    Output --> Result

    classDef tools fill:#fff7ed,stroke:#f97316,color:#7c2d12,stroke-width:1px;
    classDef pain fill:#fef2f2,stroke:#ef4444,color:#7f1d1d,stroke-width:1px;
    classDef core fill:#eff6ff,stroke:#2563eb,color:#1e3a8a,stroke-width:1px;
    classDef success fill:#ecfdf5,stroke:#22c55e,color:#14532d,stroke-width:1px;

    class Claude,Gemini,Cursor,Copilot,Codex,OpenCode tools;
    class Chaos pain;
    class Source,Sync,Output core;
    class Result success;

Typical workflow

flowchart LR
    Init[agentsync init<br/>Create or migrate config] --> Apply[agentsync apply<br/>Create or refresh symlinks]
    Apply --> Status[agentsync status<br/>Inspect sync state]
    Status --> Skill[agentsync skill ...<br/>Manage installed skills]

    classDef action fill:#f8fafc,stroke:#475569,color:#0f172a,stroke-width:1px;
    class Init,Apply,Status,Skill action;

Why AgentSync?

Different AI coding tools expect configuration files in various locations:

Tool	Instructions	Commands	Skills
Claude Code	CLAUDE.md	.claude/commands/	.claude/skills/
GitHub Copilot	.github/copilot-instructions.md	-	-
Gemini CLI	GEMINI.md	.gemini/commands/	.gemini/skills/
Cursor	.cursor/rules/agentsync.mdc	-	.cursor/skills/
VS Code	-	-	-
OpenCode	OPENCODE.md	.opencode/command/	.opencode/skills/
OpenAI Codex	AGENTS.md	-	.codex/skills/

AgentSync maintains a single source of truth in .agents/ and creates symlinks to all required locations.

Features

• 🔗 Symlinks over copies - Changes propagate instantly
• 📝 TOML configuration - Human-readable, easy to maintain
• 📋 Gitignore management - Automatically updates .gitignore
• 🛡️ Safe - Automatically backs up existing files before replacing them
• 🖥️ Cross-platform - Linux, macOS, Windows
• 🚀 CI-friendly - Gracefully skips when binary unavailable
• ⚡ Fast - Single static binary, no runtime dependencies
• 🧩 Curated skills - Install from the dallay/agents-skills collection or external providers

Catalog validation

AgentSync ships a full catalog installation E2E check that validates every skill entry can still be resolved, installed, and registered correctly.

• GitHub Actions workflow: Catalog E2E
• Manual run: Actions → Catalog E2E → Run workflow
• Scheduled run: every Monday at 08:00 UTC
• Local run:

git clone https://github.com/dallay/agents-skills ../agents-skills
export AGENTSYNC_LOCAL_SKILLS_REPO="$(pwd)/../agents-skills"
RUN_E2E=1 cargo test --test test_catalog_integration -- --ignored --nocapture

If you already keep agents-skills as a sibling checkout next to this repository, you can skip the environment variable and let the test auto-discover that sibling path instead.

This check is intentionally separate from normal CI because it depends on external networks and third-party skill repositories.

Installation

Node.js Package Managers (Recommended)

If you have Node.js (>=18) installed, the easiest way to install AgentSync is through a package manager.

Global Installation

# Using npm
npm install -g @dallay/agentsync

# Using pnpm
pnpm add -g @dallay/agentsync

# Using yarn (Classic v1)
yarn global add @dallay/agentsync

# Using bun
bun i -g @dallay/agentsync

One-off Execution

If you want to run AgentSync without a permanent global installation:

# Using npx (npm)
npx @dallay/agentsync apply

# Using dlx (pnpm)
pnpm dlx @dallay/agentsync apply

# Using dlx (yarn v2+)
yarn dlx @dallay/agentsync apply

# Using bunx (bun)
bunx @dallay/agentsync apply

Local Installation (Dev Dependency)

# Using npm
npm install --save-dev @dallay/agentsync

# Using pnpm
pnpm add -D @dallay/agentsync

# Using yarn
yarn add -D @dallay/agentsync

# Using bun
bun add -d @dallay/agentsync

From crates.io (Rust)

If you have Rust installed, you can install AgentSync directly from crates.io:

cargo install agentsync

From GitHub Releases (Pre-built Binaries)

Visit the GitHub Releases page to find the latest version number and correct platform identifier for your system.

To install via terminal, you can use the following script (be sure to replace the <version> placeholder with a real tag, e.g., 1.28.0):

# Define version and platform
VERSION="<version>"
# Detect architecture (macOS)
PLATFORM=$([ "$(uname -m)" = "arm64" ] && echo "aarch64-apple-darwin" || echo "x86_64-apple-darwin")
# Or specify manually for Linux, e.g., x86_64-unknown-linux-gnu
# PLATFORM="x86_64-unknown-linux-gnu"
TARBALL="agentsync-${VERSION}-${PLATFORM}.tar.gz"

# Download binary and checksum
curl -LO "https://github.com/dallay/agentsync/releases/download/v${VERSION}/${TARBALL}"
curl -LO "https://github.com/dallay/agentsync/releases/download/v${VERSION}/${TARBALL}.sha256"

# Verify integrity
if command -v sha256sum >/dev/null; then
  sha256sum --check "${TARBALL}.sha256"
else
  shasum -a 256 --check "${TARBALL}.sha256"
fi

if [ $? -ne 0 ]; then
  echo "Error: Checksum verification failed!"
  exit 1
fi

# Extract and install
tar xzf "${TARBALL}"
sudo mv agentsync-*/agentsync /usr/local/bin/

From Source (Requires Rust 1.89+)

Install directly from the GitHub repository (requires Node.js 22.22.0+ and Rust 1.89+):

cargo install --git https://github.com/dallay/agentsync

Or clone and build manually:

git clone https://github.com/dallay/agentsync
cd agentsync
cargo build --release

# The binary will be available at ./target/release/agentsync

Quick Start

New Projects

1. Initialize configuration in your project:

cd your-project
agentsync init

This creates .agents/agentsync.toml with a default configuration.

Existing Projects with Agent Files

If you already have agent configuration files scattered across your project (like CLAUDE.md, .cursor/, or .github/copilot-instructions.md), use the interactive wizard:

cd your-project
agentsync init --wizard

The wizard will scan for existing files, let you select which to migrate, and set up everything automatically.

---

1. Edit the configuration to match your needs (see Configuration)

2. Apply the configuration:

agentsync apply

1. Add to your project setup (e.g., package.json):

{
  "scripts": {
    "prepare": "agentsync apply || true"
  }
}

Team workflow note

AgentSync defaults to managed .gitignore mode ([gitignore].enabled = true), which is the recommended starting point for most teams. If your team intentionally wants to commit AgentSync-managed destinations instead, treat [gitignore].enabled = false as an explicit opt-out workflow. See the canonical guide: https://dallay.github.io/agentsync/guides/gitignore-team-workflows/

If you run AgentSync from Windows and need native symlink prerequisites, WSL guidance, or recovery steps, use the dedicated setup guide: https://dallay.github.io/agentsync/guides/windows-symlink-setup/

If your team wants agentsync apply to run after branch switches, merges, or rebases, use the Git hook automation guide for Lefthook, Husky, simple-git-hooks, and native hook examples: https://dallay.github.io/agentsync/guides/git-hook-automation/

Usage

# Initialize a new configuration
agentsync init

# Initialize with interactive wizard (for existing projects with agent files)
agentsync init --wizard

# Apply configuration (create symlinks)
agentsync apply

# Clean existing symlinks before applying
agentsync apply --clean

# Remove all managed symlinks
agentsync clean

# Use a custom config file
agentsync apply --config /path/to/config.toml

# Dry run (show what would be done without making changes)
agentsync apply --dry-run

# Skip gitignore reconciliation for this run only
agentsync apply --no-gitignore

# Filter by agent
agentsync apply --agents claude,copilot

# Verbose output
agentsync apply --verbose

# Show status of managed symlinks
agentsync status

# Run diagnostic and health check
agentsync doctor [--project-root <path>]

# Manage skills
agentsync skill install <skill-id>
agentsync skill update <skill-id>
agentsync skill uninstall <skill-id>

Status

Verify the state of AgentSync-managed targets. Useful for local verification and CI.

agentsync status [--project-root <path>] [--json]

• --project-root <path>: Optional. Path to the project root to locate the agentsync config.
• --json: Output machine-readable JSON (pretty-printed).

status is sync-type aware:

• symlink targets are checked as one managed destination symlink.
• symlink-contents targets are checked as destination directories whose managed child entries are the symlinks.
• An existing empty .agents/commands/ source directory is valid, so an empty destination like .claude/commands/ is not reported as missing or "not a symlink" just because it currently has 0 managed entries.

Exit codes: 0 = no problems, 1 = problems detected (CI-friendly)

Configuration

Configuration is stored in .agents/agentsync.toml:

# Source directory (relative to this config file)
source_dir = "."

# Optional: compress AGENTS.md and point symlinks to the compressed file
# compress_agents_md = false

# Default agents to run when --agents is not specified.
# If empty, all enabled agents will be processed.
default_agents = ["claude", "copilot"]

# Gitignore management
[gitignore]
enabled = true
marker = "AI Agent Symlinks"
# Additional entries to add to .gitignore (target destinations are added automatically)
entries = []

# Agent definitions
[agents.claude]
enabled = true
description = "Claude Code - Anthropic's AI coding assistant"

[agents.claude.targets.instructions]
source = "AGENTS.md"
destination = "CLAUDE.md"
type = "symlink"

[agents.claude.targets.commands]
source = "commands"
destination = ".claude/commands"
type = "symlink-contents"
pattern = "*.agent.md"

MCP Support (Model Context Protocol)

AgentSync can automatically generate MCP configuration files for supported agents (Claude Code, GitHub Copilot, OpenAI Codex CLI, Gemini CLI, Cursor, VS Code, OpenCode).

This allows you to define MCP servers once in agentsync.toml and have them synchronized to all agent-specific config files.

[mcp]
enabled = true

# Strategy for existing files: "merge" (default) or "overwrite"
# "merge" preserves existing servers but overwrites conflicts with TOML config
merge_strategy = "merge"

# Define servers once
[mcp_servers.filesystem]
command = "npx"
args = ["-y", "@modelcontextprotocol/server-filesystem", "."]

[mcp_servers.git]
command = "npx"
args = ["-y", "@modelcontextprotocol/server-git", "--repository", "."]

# Optional fields:
# env = { "KEY" = "VALUE" }
# disabled = false

Supported Agents (canonical)

AgentSync supports the following agents and will synchronize corresponding files/locations. This list is canonical — keep it in sync with src/mcp.rs (authoritative).

• Claude Code — .mcp.json (agent id: claude)
• GitHub Copilot — .vscode/mcp.json (agent id: copilot)
• OpenAI Codex CLI — .codex/config.toml (agent id: codex) — TOML format with [mcp_servers.<name>] tables. AgentSync maps headers to Codex http_headers.
• Gemini CLI — .gemini/settings.json (agent id: gemini) — AgentSync will add trust: true when generating Gemini configs.
• Cursor — .cursor/mcp.json (agent id: cursor)
• VS Code — .vscode/mcp.json (agent id: vscode)
• OpenCode — opencode.json (agent id: opencode)

AgentSync also supports 32+ agents (7 native MCP agents and 25+ configurable agents) including Windsurf, Cline, Amazon Q, Aider, RooCode, Trae, and more. See the full list in the documentation.

See the MCP Integration Guide for formatter details and merge behavior.

Merge Behavior

When merge_strategy = "merge":

1. AgentSync reads the existing config file (if it exists).
2. It adds servers defined in agentsync.toml.
3. Conflict Resolution: If a server name exists in both, the definition in agentsync.toml wins and overwrites the existing one.
4. Existing servers NOT in agentsync.toml are preserved.

Target Types

Type	Description
symlink	Create a symlink to the source file/directory
symlink-contents	Create symlinks for each item in the source directory
nested-glob	Recursively discover files and create symlinks for each match
module-map	Map centrally-managed source files to module directories

The symlink-contents type optionally supports a pattern field (glob pattern like *.md) to filter which items to link. AgentSync treats the destination as a managed directory container, so agentsync status validates the child links inside that directory instead of expecting the directory itself to be a symlink.

Nested Glob Target (nested-glob)

The nested-glob type discovers files matching a recursive glob pattern and creates a symlink for each discovered file. This is ideal for monorepos and multi-module projects where different subdirectories contain their own AGENTS.md files.

[agents.claude.targets.nested]
# Root directory to search (relative to the project root)
source = "."

# Glob pattern – supports ** for multi-level directory matching
pattern = "**/AGENTS.md"

# Paths to exclude (matched against each file's path relative to source)
exclude = [
    ".agents/**",
    "node_modules/**",
    "**/target/**",
    "**/build/**",
    "**/dist/**",
    "**/.git/**",
]

# Destination template – placeholders replaced for each discovered file:
#   {relative_path}  parent directory relative to `source`  (e.g. clients/agent-runtime)
#                    For files at the root of `source`, this is "." (not empty)
#   {file_name}      file name                               (e.g. AGENTS.md)
#   {stem}           file name without extension             (e.g. AGENTS)
#   {ext}            file extension without leading dot      (e.g. md)
destination = "{relative_path}/CLAUDE.md"

type = "nested-glob"

Given the structure:

project-root/
├── .agents/
│   └── AGENTS.md          # excluded by .agents/**
├── clients/
│   └── agent-runtime/
│       └── AGENTS.md      # → clients/agent-runtime/CLAUDE.md
└── modules/
    └── core-kmp/
        └── AGENTS.md      # → modules/core-kmp/CLAUDE.md

AgentSync would create:

• clients/agent-runtime/CLAUDE.md → symlink to clients/agent-runtime/AGENTS.md
• modules/core-kmp/CLAUDE.md → symlink to modules/core-kmp/AGENTS.md

Project Structure

.agents/
├── agentsync.toml      # Configuration file (source of truth for MCP)
├── AGENTS.md           # Main agent instructions (single source)
├── commands/           # Canonical agent commands source
│   ├── review.agent.md
│   └── test.agent.md
├── skills/             # Shared knowledge/skills
│   └── kotlin/
│       └── SKILL.md
└── prompts/            # Reusable prompts
    └── code-review.prompt.md

After running agentsync apply:

project-root/
├── CLAUDE.md           → .agents/AGENTS.md
├── GEMINI.md           → .agents/AGENTS.md
├── AGENTS.md           → .agents/AGENTS.md
├── .mcp.json           (Generated from agentsync.toml)
├── .claude/
│   ├── commands/       → managed directory with symlinks to .agents/commands/*.agent.md
│   └── skills/         → symlinks to .agents/skills/*
├── .gemini/
│   ├── settings.json   (Generated from agentsync.toml)
│   ├── commands/       → managed directory with symlinks to .agents/commands/*.agent.md
│   └── skills/         → symlinks to .agents/skills/*
└── .github/
    ├── copilot-instructions.md → .agents/AGENTS.md
    └── agents/         → symlinks to .agents/commands/*.agent.md

CI/CD Integration

AgentSync gracefully handles CI environments where the binary isn't available:

{
  "scripts": {
    "agents:sync": "pnpm exec agentsync apply",
    "prepare": "lefthook install && pnpm run agents:sync"
  }
}

The symlinks are primarily for local development. CI builds typically don't need them.

Installing in CI

If you need agentsync in CI, you can download the latest version automatically using jq for robust parsing:

- name: Install agentsync
  env:
    GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  run: |
    # Fetch latest version using GitHub API and jq
    LATEST_TAG=$(curl -s -H "Authorization: Bearer $GH_TOKEN" \
      https://api.github.com/repos/dallay/agentsync/releases/latest | jq -r '.tag_name')
    
    if [ "$LATEST_TAG" == "null" ] || [ -z "$LATEST_TAG" ]; then
      echo "Error: Failed to fetch latest release tag"
      exit 1
    fi
    
    VERSION=${LATEST_TAG#v}
    PLATFORM="x86_64-unknown-linux-gnu"
    
    curl -LO "https://github.com/dallay/agentsync/releases/download/${LATEST_TAG}/agentsync-${VERSION}-${PLATFORM}.tar.gz"
    tar xzf agentsync-${VERSION}-${PLATFORM}.tar.gz
    sudo mv agentsync-*/agentsync /usr/local/bin/

Skills

AgentSync includes a curated skill catalog with 100+ skills across 40+ technologies. Skills are small bundles of AI-agent instructions that can be installed into your project.

• dallay/agents-skills — Canonical home for all dallay-maintained skills. Community contributions welcome via PR.
• External providers — Skills from Angular, Vercel, Cloudflare, Expo, Stripe, and many more are resolved from their respective repositories.

# Detect project technologies and get skill recommendations
agentsync skill suggest

# Install a skill
agentsync skill install docker-expert

# Install all recommended skills non-interactively
agentsync skill suggest --install --all

See the Skills Guide for full documentation.

Getting Started (Development)

This project is a monorepo containing a Rust core and a JavaScript/TypeScript wrapper.

Repository Structure

• src/: Core logic and CLI implementation in Rust.
• npm/agentsync/: TypeScript wrapper used for NPM distribution.
• website/docs/: Documentation site built with Starlight.
• tests/: Integration tests for the CLI.

Prerequisites

• Rust (1.89+ recommended)
• Node.js (v22.22.0+ recommended for development)
• pnpm

Setup

1. Install JavaScript dependencies:

   pnpm install
   

2. Build the Rust binary:

   cargo build
   

Common Commands

This project uses a Makefile to orchestrate common tasks.

• Run Rust tests:

  make rust-test
  

• Run JavaScript tests:

  make js-test
  

• Build all components:

  make all
  

• Run full verification (lint + build + test):

  make verify-all
  

• Lint the code:

  # Rust
  cargo clippy
  # JavaScript/TypeScript
  pnpm run biome:check
  

• Format the code:

  make fmt
  

Release Process

Releases are managed via semantic-release and GitHub Actions. To trigger a dry run locally:

pnpm run release:dry-run

Troubleshooting

PNPM_NO_MATURE_MATCHING_VERSION

If pnpm install fails with this error, it's likely due to a strict package release age policy. You can try installing with --ignore-scripts or wait for the package to "mature" in the registry.

Lefthook installation failure

If pnpm install fails during the lefthook setup, you can try:

pnpm install --ignore-scripts

Build failures (Rust)

Ensure you have the latest stable Rust toolchain installed. You can update with rustup update stable.

Symlink creation fails on Windows

Use the dedicated Windows setup guide for native prerequisites, WSL positioning, verification, and recovery steps: https://dallay.github.io/agentsync/guides/windows-symlink-setup/

Inspiration

• Ruler - Similar concept but copies files instead of using symlinks

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines on how to get started.

License

MIT License - see LICENSE for details.