Baton

Name: Baton
Author: Kaseban

by Kasebanversion 0.3.0i★ –iRuns on your computer

Registry nametech.kasabeh/baton

Install

Overview

Description from the maker (original English)

Pass the baton between coding agents: convert sessions across Claude Code, OpenCode, Codex & more.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi0 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 0 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "baton": {
      "command": "npx",
      "args": [
        "-y",
        "@kasabeh/baton-mcp",
        "serve"
      ]
    }
  }
}

Run this in your terminal

claude mcp add baton -- npx -y @kasabeh/baton-mcp serve

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "baton": {
      "command": "npx",
      "args": [
        "-y",
        "@kasabeh/baton-mcp",
        "serve"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "baton": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@kasabeh/baton-mcp",
        "serve"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

! Caution
Maker matches the repo
The publisher (kasabeh.tech) is not the repo owner (Kaseban); someone else may have listed it
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32602 servers in this category
Published to the registry more recently than 17% of the other 32602 servers in this category
Basic checks equal to or better than 30% of the other 32602 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Baton safe?

It passed 0 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.3.0) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Rystic

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Pass the baton between coding agents.

Convert any coding-agent session to any other. One command. Keep going where you left off.

A passed transcript kept 14/17 concrete facts. A hand-written handoff summary kept 3/17. Benchmark ↓

The 4 p.m. problem

It's 4 p.m. Claude Code says "usage limit reached — resets at 10 p.m." You're three hours into a session: architecture decided, edge cases mapped, half the diff written.

❌ Without baton — open another agent and start from zero. Re-explain the plan. Re-read the files. Re-litigate every decision you already made.

✅ With baton — pass the session and keep going:

baton convert --from claude-code --to opencode --latest --import

using latest claude-code session: 2026-07-09 15:58 Refactor the auth middleware to…

passed baton: claude-code → opencode (1388 messages) → handoff.json

Imported session: ses_8c4c973a521549e2

opencode -s ses_8c4c973a521549e2 # same conversation, different runner

Works in every direction: switch agents mid-task, try a second opinion on a hard bug, move a session from your editor agent to a terminal agent, or archive everything in one format.

Quick start

# zero-install run (downloads prebuilt binary)

npx @kasabeh/baton-mcp --help

convert your most recent session + auto-import into the target agent

baton convert --from claude-code --to opencode --latest --import

or omit the path to pick interactively — newest first,

each session previewed by its first user message

baton convert --from claude-code --to opencode --import

or pass an explicit session file

baton convert --from claude-code --to opencode --import

see every session on your machine, across all agents

baton list

Where do session files live?

You never have to hunt these down (--latest and the interactive picker find them for you), but for reference — each agent stores its transcripts on disk:

Agent	Location
Claude Code	`~/.claude/projects/ / .jsonl`
Codex CLI	`~/.codex/sessions/ / / /rollout-*.jsonl`

baton list prints the path of every session it can find, across all agents.

Supported formats

Agent	Read	Write	Auto-import
Claude Code	✅	✅	—
OpenCode	✅	✅	✅ `opencode import`
Codex CLI	✅	✅	—
Gemini CLI	✅	✅	—
Zed	✅	✅	—
Aider	✅	✅	—
Cursor	✅¹	—²	—
Continue	✅	—	—
Cline / Roo	✅	—²	—

¹ Cursor reads from exported JSON (sqlite3 state.vscdb "SELECT value FROM ItemTable WHERE key='aiService:chats'")

² Not planned: Cursor and Cline keep session state inside editor databases (SQLite / VS Code globalState) with no file-level import path.

Benchmark

Does carrying the full transcript beat writing a handoff summary for the next agent? We measured both on a real 3.4 MB Claude Code session (same model both arms, only the context differs):

session size	baton transcript	handoff summary
sm (93 KB)	3/3 details recalled	1/3
md (198 KB)	6/6	1/6
lg (599 KB)	5/8	1/8
total	14/17	3/17

The summary lost concrete facts (versions, line counts, MSRV) even on the smallest slice — the receiving agent had to re-read files and re-run commands to rediscover them. Mechanical fidelity: all 896 messages are written to every target; round-trip loss reflects each target format's expressiveness (claude-code 896/896, codex 736, gemini-cli 723, aider 111 — it stores chat text only).

We also measured task continuation: cut the session at three mid-task points, ask a fresh agent to state the task, state, and next steps. Result: parity (baton 10/12, handoff 10/12) — a good summary is enough for *what to do next*; the transcript is what answers the *specific factual questions* the summary's author didn't anticipate. And the summary only exists if an agent spends a full transcript read writing it — baton makes the transfer free.

Full methodology, caveats, and reproduction steps: benchmark/RESULTS.md.

MCP server

baton is also an MCP server — your agent can pass the baton itself, mid-conversation:

Tool	Description
`list_sessions`	Scan all agents, return a unified list
`convert_session`	Convert a session from one format to another
`import_to_target`	Convert + run the target agent's import command
`detect_format`	Sniff a file/dir and report which agent produced it

baton install     # registers baton in every detected agent's MCP config

baton doctor # verify baton uninstall # remove from all agents

How it works

Claude Code session (.jsonl)

│ ▼ baton read ──► canonical Session { messages: [Text, Reasoning, ToolCall, ToolResult] } │ ▼ baton write ──► OpenCode import JSON (SessionV1 schema)

Every agent format is read into a canonical intermediate representation, then written out in the target format. Adding a new format is O(1), not O(N×M) per-pair converters.

Install

# npm (prebuilt binary, no Rust needed)

npm install -g @kasabeh/baton-mcp

Homebrew

brew install kaseban/tap/baton-mcp

Cargo binstall (prebuilt binary)

cargo binstall baton-mcp

Cargo (from source)

cargo install baton-mcp

Shell installer (prebuilt binary)

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/Kaseban/baton/releases/latest/download/baton-mcp-installer.sh | sh

Or grab a binary from GitHub Releases.

Building

git clone https://github.com/Kaseban/baton.git

cd baton cargo build --release ./target/release/baton --help

Contributing

Each format lives in src/formats/ .rs and implements the Format trait (read + write). See src/formats/claude_code.rs for a complete reference implementation.

All nine formats have readers; Claude Code, OpenCode, Codex, Zed, Aider, and Gemini CLI also have writers. The most impactful contribution now is a writer for Continue.

Regenerating the demo

The README GIF is scripted with VHS: vhs assets/demo.tape. It records against a sandboxed $HOME (/tmp/demo) populated with fabricated sessions, so no real session data ends up in the GIF.

Don't drop the baton.

License

Dual-licensed under MIT OR Apache-2.0.

Baton

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Rystic

README from the maker

The 4 p.m. problem

using latest claude-code session: 2026-07-09 15:58 Refactor the auth middleware to…

passed baton: claude-code → opencode (1388 messages) → handoff.json

Imported session: ses_8c4c973a521549e2

Quick start

convert your most recent session + auto-import into the target agent

or omit the path to pick interactively — newest first,

each session previewed by its first user message

or pass an explicit session file

see every session on your machine, across all agents

Where do session files live?

Supported formats

Benchmark

MCP server

How it works

Install

Homebrew

Cargo binstall (prebuilt binary)

Cargo (from source)

Shell installer (prebuilt binary)

Building

Contributing

Regenerating the demo

License