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agentmash

For teams running coding agents: lets each agent see which files teammates' agents are editing.

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Category: Code · Agents · Productivity
Price from official sources: Freemium
Website: agentmash.dev
Added to site: Nov 2, 2026

What is agentmash

agentmash is a team coordination layer for coding agents such as Claude Code, Codex and Cursor, letting each agent know which files other agents are changing to avoid conflicts. It runs as a desktop app on macOS, Windows and Linux plus a CLI via npx. It installs hooks into local agent configs and sends the first 500 characters of prompts to its service, so review the privacy settings; it is free for up to 2 developers, with a Team plan at $20 per developer per month.

How to use

Download agentmash lobby for macOS (13+) or Windows 10/11 from agentmash.dev/download;
on Linux use the CLI.
Someone who can push to your repository connects it at agentmash.dev/install.
Each developer runsnpx agentmash loginonce and signs in with GitHub;
it connects the coding agents it finds on the machine.
Restart your coding agent (Claude Code, Codex, Cursor, GitHub Copilot and others) so its hooks load.
Work as usual: before an edit, your agent is told if a teammate's agent is changing the same file or a symbol it depends on.
Optionally claim files before starting, or set AGENTMASH_STRICT=1 to cancel edits into a teammate's change until acknowledged.

Use cases

Teams where several developers run AI coding agents on the same repository Catching overlapping edits before they become merge conflicts Spotting API breaks when a teammate changes an exported symbol your file depends on Running Claude Code, Codex, Cursor and more side by side in one desktop app on your own logins Seeing a live view and weekly digest of who is working on what

FAQ

Is there an app?

Yes: agentmash lobby, the desktop app for macOS and Windows. It runs 8 coding agents side by side, each on your own login, and comes with every plan. If you live in a terminal, `npx agentmash login` connects agents on your machine instead.

Does it lock files?

No, nothing is ever locked. The advisory before an edit is a note the agent reads (or, for some agents, a refusal of the first edit with the advisory as the reason). Teams that want a block can set AGENTMASH_STRICT=1.

How is it different from git worktrees?

A worktree gives an agent its own checkout so two agents never write into the same files on disk, but it does not tell one agent what another is changing. agentmash tells your agent what teammates' agents are changing on any branch and machine, before it edits. Use both.

What if the server is down or slow?

Your agents keep working. Every hook caps its network call with a hard timeout and exits on any failure; the check before an edit waits 1500 ms at most by default.

Does the server see my code?

No, unless your room turns diffs on. The room gets file paths, branch names, the shape of each change and the first 500 characters of a prompt. AGENTMASH_DIFFS=0 keeps diffs on your machine and AGENTMASH_HINTS=0 keeps prompts there too.

Can we run our own server?

Yes, on the enterprise plan. Self-hosting runs a private Docker image on one machine on your network.

Price from official sources

Freemium

Free：$0, up to 2 developers, 1 private repo, unlimited public repos, 7 days of history.
Team：$20 per developer/month billed monthly (first month free), or $16 per developer/month billed annually ($192/year).
Unlimited private repos, up to 90 days of history.
Enterprise：from $15k a year, invoiced;
self-hosting from a private Docker image.
Agents are never counted;
you pay per developer whose agent reported in the period.

Check the official site for current pricing · Price not yet checked by our editors

Source: agentmash.dev · Info as of Nov 2, 2026

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