Sync82 MCP Server

sync82

🌐 Language: English · Português

sync82 is a Model Context Protocol (MCP) server that gives an AI coding agent persistent, structured memory of a software project across sessions — goals, architecture, tech stack, decisions, and progress, all stored locally and recalled automatically the next time the agent opens the project.

Table of Contents

• Overview
• Prerequisites & Quick Installation
• Client Setup
• Update & Maintenance
• Documentation
• AI Usage in This Project
• License

Overview

Memory is stored in an embedded SQLite database and ships as a single self-contained binary — no runtime toolchain, no npm package, just sync82 on your PATH. The agent reads and writes it through MCP tools; you talk to the agent in plain language.

• Six standard memory files per project, plus any custom file, for projects and their subprojects (monorepos, plugin ecosystems).
• Automatic project discovery — a .sync82.json in the workspace means the agent never has to name the project again.
• 19 MCP tools — load a whole project's context in one call, save a session in one call, search the whole vault, archive old history, export/import plain Markdown — plus read-only MCP resources with each project's memory and start_session/end_session prompts.
• One-step client setup — sync82 install registers sync82 in Claude Code, Claude Desktop, Antigravity, Codex, OpenCode, Cursor, Zed and Cline; sync82 uninstall removes it.
• Local and private — stdio transport only, no network service, one SQLite file per vault.
• Verifiable releases — SHA-256 checksums, a Sigstore signature and GitHub build provenance attestations; a Claude Desktop extension (sync82.mcpb) and an MCP Registry entry.

Tools (19)

The AI agent calls these over MCP — it never touches the database directly. Full parameter reference in Tools Reference.

list_projects, list_files, check_project_health and search_memory also return JSON (format: "json"). Besides tools, sync82 serves each project's memory as MCP resources (sync82://projects/<project>/context) and two MCP prompts, start_session and end_session. Not sure what to type to your agent? See Example Prompts.

CLI commands

Full flags, exit codes, and examples for every command: CLI Reference.

Prerequisites & Quick Installation

Prerequisites: Linux, macOS, or Windows (amd64/arm64) — a release binary needs nothing else; building from source needs a Go toolchain matching go.mod (1.26+). You'll also need an MCP client (see Client Setup). Claude Desktop users can skip this section and install the .mcpb extension instead.

Two ways to get the binary on any OS — either works, but don't mix update mechanisms (see CLI Reference — self-update).

Linux

Prebuilt binary (no Go toolchain needed):

curl -LO https://github.com/oito2/mcp-sync82/releases/latest/download/sync82_linux_amd64   # or sync82_linux_arm64
curl -LO https://github.com/oito2/mcp-sync82/releases/latest/download/checksums.txt
sha256sum -c checksums.txt --ignore-missing   # must print "sync82_linux_amd64: OK"
chmod +x sync82_linux_amd64
sudo mv sync82_linux_amd64 /usr/local/bin/sync82

From source (requires Go 1.26+ — download it from go.dev/dl; distribution packages such as Debian/Ubuntu's golang-go are usually older):

go install github.com/oito2/mcp-sync82/cmd/sync82@latest

macOS

Prebuilt binary (no Go toolchain needed):

curl -LO https://github.com/oito2/mcp-sync82/releases/latest/download/sync82_darwin_arm64   # Intel: sync82_darwin_amd64
curl -LO https://github.com/oito2/mcp-sync82/releases/latest/download/checksums.txt
grep ' sync82_darwin_arm64$' checksums.txt | shasum -a 256 -c   # must print "sync82_darwin_arm64: OK"
chmod +x sync82_darwin_arm64
sudo mv sync82_darwin_arm64 /usr/local/bin/sync82

From source (requires a Go toolchain — brew install go):

go install github.com/oito2/mcp-sync82/cmd/sync82@latest

Windows

Prebuilt binary (no Go toolchain needed — PowerShell):

$base = "https://github.com/oito2/mcp-sync82/releases/latest/download"
Invoke-WebRequest -Uri "$base/sync82_windows_amd64.exe" -OutFile sync82_windows_amd64.exe
Invoke-WebRequest -Uri "$base/checksums.txt" -OutFile checksums.txt
$expected = ((Select-String -Path checksums.txt -SimpleMatch "sync82_windows_amd64.exe").Line -split '\s+')[0]
if ((Get-FileHash sync82_windows_amd64.exe -Algorithm SHA256).Hash -ne $expected) { throw "checksum mismatch" }
New-Item -ItemType Directory -Force "$env:LOCALAPPDATA\sync82" | Out-Null
Move-Item sync82_windows_amd64.exe "$env:LOCALAPPDATA\sync82\sync82.exe"
# add $env:LOCALAPPDATA\sync82 to PATH: System Properties > Environment Variables

From source (requires a Go toolchain — installer):

go install github.com/oito2/mcp-sync82/cmd/sync82@latest

---

Every release ships a checksums.txt (verified in the steps above), a Sigstore bundle signing it (checksums.txt.sigstore.json), and a GitHub build provenance attestation for every binary and the .mcpb bundle (gh attestation verify <file> --repo oito2/mcp-sync82) — see the Installation Guide.

go install/go build produces the final binary directly, ready to run — make sure $(go env GOPATH)/bin (or %GOBIN%/$GOBIN) is on your PATH; check with which sync82 (where sync82 on Windows).

Client Setup

Register sync82 in every supported client detected on your machine, in one step:

sync82 install            # lists the detected clients, asks to confirm, configures each of them
sync82 install claude     # configure a single client instead

Targets: claude, claude-desktop, antigravity, codex, opencode, cursor, zed, cline. Each client is registered with the absolute path of the sync82 binary you ran, so run sync82 install again if you move the binary. Each target prints configured. or updated.; a client that isn't detected (its command on PATH or its config directory) is skipped.

Claude Code by hand (user scope, every project):

claude mcp add --scope user sync82 -- /usr/local/bin/sync82   # the path printed by `which sync82`
claude mcp list

Claude Desktop — no binary needed: download sync82.mcpb and install it from Claude Desktop's Settings → Extensions → Advanced settings → Extension Developer → Install Extension…. sync82 is also listed in the MCP Registry as io.github.oito2/mcp-sync82.

Per-client guides, with manual configuration and troubleshooting: Claude Code · Claude Desktop · Antigravity · Codex · OpenCode · Cursor · Zed · Cline. Any other client just needs command set to the binary's absolute path — see Installer.

Update & Maintenance

sync82 self-update --check   # report whether a newer release exists, without installing it
sync82 self-update           # download, verify (SHA-256) and install the latest release
sync82 self-update --rollback   # restore the previous version, kept as <binary>.bak

self-update works on a release binary or a go install .../sync82@vX.Y.Z build. If you installed with go install, update with go install github.com/oito2/mcp-sync82/cmd/sync82@latest instead — don't mix the two. The Claude Desktop extension is updated by installing a newer sync82.mcpb. A release can upgrade the vault schema (1.1.0 does); once the new version has opened a vault, the previous binary — including one restored by --rollback — refuses that vault, so update every client that shares it and don't roll back past such a release (see Troubleshooting).

To remove sync82 from every detected client, run sync82 uninstall (add --purge to also delete the default vault and config in ~/.sync82) — see Uninstallation for the complete removal, binary included.

Documentation

The documentation site has the full detail (also in Portuguese):

• Installation · Quickstart · Uninstallation
• Concepts — Architecture and internals
• Reference: Tools · Resources · MCP Prompts · CLI · Configuration
• Example Prompts · Usage Examples
• Troubleshooting · Changelog

Contributing: see CONTRIBUTING.md for the development workflow, the checks CI runs (go build ./..., go vet ./..., gofmt -l ., golangci-lint, go test ./... -race, govulncheck), and how releases are published. Everyone participating is expected to follow the Code of Conduct.

AI Usage in This Project

This project was developed with the assistance of generative AI tools:

• Scope: Generation of boilerplate, unit tests and refactoring of helper functions.

• Oversight: All generated code was manually reviewed, tested and validated before integration.

License

GPL-3.0 — see LICENSE.