Coshell vs OpenCode: same agent engine, plus the team.

Coshell is built on OpenCode, compatible through v1.17.10. OpenCode is the agent engine. Coshell adds the layer between the people.

Start free

At a glance

OpenCode is the engineThe open-source agent that runs the models, the tools, the terminal, and the edits. 174k stars. Coshell does not replace it.

We track it closelyCoshell is a fork pinned to OpenCode and compatible through v1.17.10. The CLI, the SDK, and the wire protocol are unchanged.

We add one layerEverything below is what Coshell builds on top: the layer that lets a whole team work in one live session.

OpenCode makes one person work with the agent.

Coshell makes the whole team work with the agent, together.

AOrders dashboard for acme-webARate limiter rolloutADev server on the VMDProject pending statusOCount to 120

Open

Orders dashboard for acme-web

feat/orders TRLF

Add the orders overview to the dashboard: revenue today, order count, and average order value, then the recent orders table.Priya Nair

Explored4 reads

EditOrdersDashboard.jsx /src/pages/+77−0

Editindex.css /src/+33−0

Overview is in with the three stat cards and the recent orders table. Live on http://localhost:5173.

2 Changed files+110 −0

src/pages/OrdersDashboard.jsx+77−0

src/index.css+33−0

Can the stat cards stretch to equal height? The average order card is shorter than the others.Lena Fischer

Editindex.css /src/+4−1

Cards stretch now. The grid uses align-items: stretch and each delta line is pinned to the bottom with margin-top: auto.

Add a 7 day / 30 day toggle above the chart. Default to 7 days.Tom Reyes

EditOrdersDashboard.jsx /src/pages/+31−4

Shellbun test

Added the toggle. 30 days aggregates by week and the axis relabels. 8 tests pass.

Move the delta onto the card’s top row, right aligned against the label.Priya Nair

Editindex.css /src/+6−2

Delta sits on the top row now, right aligned, so the numbers line up down the column.

Use var(--brand) for the Export button, not a hardcoded hex.Tom Reyes

EditOrdersDashboard.jsx /src/pages/+1−1

1 prompt queuedClear queue

Lena FischerMake the Refunded pill amber. Red reads like an error.

Claude Sonnet 5

Rate limiter rollout

feat/rate-limit TR

Start the rate limiter plan. Token bucket per API key, 100 a minute.Priya Nair

Explored6 reads

EditrateLimit.ts /src/middleware/+64−0

Shellbun test

Token bucket middleware is in with 12 tests. Step 1 verified.

Keep the bucket in Redis, we run three replicas.Tom Reyes

EditrateLimit.ts /src/middleware/+22−9

Moved the bucket to Redis with a Lua script so the check is atomic across replicas. 14 passing. Steps 2 and 3 verified.

Execute step 4. Start with the webhooks route, I already reviewed the limiter.Lena Fischer

ReadrateLimit.ts

Editwebhooks.ts /src/routes/+14−2

Shellbun test

Webhooks now share the limiter. 16 passing. Marking step 4 verified and moving to the flag rollout.

Thinking

Claude Sonnet 5

Dev server on the VM

main TRLF

Start the dev server on this VM so the team can preview the orders dashboard.Priya Nair

Shellwhich node npm bun

Node.js isn’t installed on this VM, so I can’t start the dev server yet. I can install it with the system package manager and then run it. Want me to?

Yes, but use the LTS build, the API image pins Node 22.Lena Fischer

Understood, Node 22 LTS from NodeSource.

go ahead and install it and get the server started.Tom Reyes

Shellcat /etc/os-release 2>/dev/null | head -5; which apt-get

Shellsudo apt-get update -qq && sudo apt-get install -y -qq nodejs npm

Shellnode --version && npm --version

Shellnpm install

Shellnpm run dev &

Server is running at http://localhost:5173/, Vite dev server ready in 284ms.

Big Pickle

Project pending status

feature/discounts LFTR

What is the status of the discounts branch?Tom Reyes

Shellgit log --oneline feature/discounts -8

Eight commits since main: the coupon model, the checkout hook, and a migration. No PR yet.

Do we have a written plan for the discounts work?Priya Nair

No. You have no PLAN, TODO, or roadmap file.

Your closest thing to a plan is .coshell/review/dod.md: integer cents, handled promises, no focused tests, no dead exports.

Draft one from the commits and the dod file, then open it in the Plan tab.Lena Fischer

Readdod.md

Editdiscounts.md /docs/plans/+48−0

Drafted docs/plans/discounts.md with five steps. It is waiting for approval in the Plan tab.

Muse Spark 1.3 Free

Count to 120

main LFTR

Quick sanity check on Big Pickle before we let it near the repo. Say hi.Tom Reyes

Hi. Big Pickle here, ready when you are.

Without using any tools, list the first ten primes.Priya Nair

2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

Without using any tools, count from 1 to 120, one number per line, then stop.Lena Fischer

1
2
3
4
5
6
7
8
9
10
11
12

Thinking

Big Pickle

Chat2PlanDeep ReviewBrowserReview

Morning. Plan is approved, I’m starting the orders dashboard on acme-web.8:52

Tom Reyes8:55I’ll take the limiter then. Which drive?

office-mac-mini has Redis running, use that one.8:55

Lena Fischer9:10Back online. Anything blocked?

Tom Reyes9:11Nope. OrdersDashboard.jsx is Priya’s, limiter is mine, webhooks are free if you want them

Lena Fischer9:12Taking webhooks.

Lena the Refunded pill should be amber, not red. I queued a prompt for it9:30

Tom Reyes9:41Picking up rateLimit.ts for the webhooks route

Lena Fischer9:42Tom I already touched the 429 path there, check the overlap note before you push

Step 4 in the plan is mine, I’ll ping when the tests are green

Sounds good. I’ll review after, then we roll the flag.9:44

Rate limiter rolloutDetailsWorking

Spec approvedPlan approvedExecuting 3/5

Goal

Protect /v2 from bursty API keys without slowing normal traffic. One key should never be able to starve the others.

Approach

A token bucket per API key, 100 requests per minute, stored in Redis so all three replicas share state. Over-limit requests get a 429 with a Retry-After header. Ship behind the rate_limit_v2 flag and roll out gradually.

Constraints

No new dependencies beyond ioredis, which we already run.
p99 latency budget: +2 ms on the hot path.
Existing tests stay green at every step.

Verification

bun test after every step. Load test with 1k keys before the flag moves to 50%. Watch 429 rate and p99 in the dashboard for a day at 10%.

Steps

Token bucket middleware with testsVerified

Add

Redis-backed bucket, atomic across replicasVerified

Add

Retry-After header on 429 responsesVerified

Add

Apply the limiter to /v2/webhooksLena, in progress

Add

Roll out behind the rate_limit_v2 flagWaiting

Add

on step 5, Roll out behind the flag

Priya Nair2m

Roll out to 10% of keys first, then 50%. Add both as substeps.

Lena Fischernow

Agreed, updating the step before the agent gets there.

Deep Review

feat/orders against main

Run review

No review yet. Run one when the branch is ready.

Port 5173Port...ShareInspect

acme

DashboardOrdersCustomersSettings

Orders

Last 7 days · updated just now

Revenue today$18,420+12% vs last week

Orders342+8%

Average order$53.86−3%

Revenue, last 7 days7 days30 days

MonTueWedThuFriSatSun

#10428Maya OseiPaid$128.40

#10427Theo LindqvistRefunded$64.00

#10426Ada MensahPaid$212.75

#10425Ravi ShankarPending$39.90

Tom

3 Changed files+112 −3

src/pages/OrdersDashboard.jsx+77−0

38 <div className="toolbar">

39+ <button className="btn">Filter</button>

40+ <button className="btn primary" style={{ background: '#5B4CF0' }}>

41+ Export

42 </div>

src/index.css+33−0

112+ .stat { border: 1px solid #e6e6e6; border-radius: 10px; }

113+ .stat .delta.up { color: var(--ok); }

114+ .status.refunded { background: var(--danger-bg); }

src/App.jsx+2−3

3- import { useMemo, useState } from 'react'

3+ import { useState } from 'react'

18- <Summary />

18+ <Summary />

19+ <OrdersDashboard />

Orders dashboard for acme-web

acme-vm

feat/orders

Add the orders overview to the dashboard: revenue today, order count, and average order value, then the recent orders table.Priya Nair

Explored4 reads

EditOrdersDashboard.jsx /src/pages/+77−0

Editindex.css /src/+33−0

Overview is in with the three stat cards and the recent orders table. Live on http://localhost:5173.

2 Changed files+110 −0

src/pages/OrdersDashboard.jsx+77−0

src/index.css+33−0

Can the stat cards stretch to equal height? The average order card is shorter than the others.Lena Fischer

Editindex.css /src/+4−1

Cards stretch now. The grid uses align-items: stretch and each delta line is pinned to the bottom with margin-top: auto.

Add a 7 day / 30 day toggle above the chart. Default to 7 days.Tom Reyes

EditOrdersDashboard.jsx /src/pages/+31−4

Shellbun test

Added the toggle. 30 days aggregates by week and the axis relabels. 8 tests pass.

Move the delta onto the card’s top row, right aligned against the label.Priya Nair

Editindex.css /src/+6−2

Delta sits on the top row now, right aligned, so the numbers line up down the column.

Use var(--brand) for the Export button, not a hardcoded hex.Tom Reyes

EditOrdersDashboard.jsx /src/pages/+1−1

Claude Sonnet 5

ChatPlanReviewDeep reviewBrowserTerminal

Rate limiter rollout

office-mac-mini

feat/rate-limit

Start the rate limiter plan. Token bucket per API key, 100 a minute.Priya Nair

Explored6 reads

EditrateLimit.ts /src/middleware/+64−0

Shellbun test

Token bucket middleware is in with 12 tests. Step 1 verified.

Keep the bucket in Redis, we run three replicas.Tom Reyes

EditrateLimit.ts /src/middleware/+22−9

Moved the bucket to Redis with a Lua script so the check is atomic across replicas. 14 passing. Steps 2 and 3 verified.

Execute step 4. Start with the webhooks route, I already reviewed the limiter.Lena Fischer

ReadrateLimit.ts

Editwebhooks.ts /src/routes/+14−2

Shellbun test

Webhooks now share the limiter. 16 passing. Marking step 4 verified and moving to the flag rollout.

Thinking

Claude Sonnet 5

ChatPlanReviewDeep reviewTerminal

Dev server on the VM

acme-vm

main

Start the dev server on this VM so the team can preview the orders dashboard.Priya Nair

Shellwhich node npm bun

Node.js isn’t installed on this VM, so I can’t start the dev server yet. I can install it with the system package manager and then run it. Want me to?

Yes, but use the LTS build, the API image pins Node 22.Lena Fischer

Understood, Node 22 LTS from NodeSource.

go ahead and install it and get the server started.Tom Reyes

Shellcat /etc/os-release 2>/dev/null | head -5; which apt-get

Shellsudo apt-get update -qq && sudo apt-get install -y -qq nodejs npm

Shellnode --version && npm --version

Shellnpm install

Shellnpm run dev &

Server is running at http://localhost:5173/, Vite dev server ready in 284ms.

Big Pickle

ChatPlanReviewDeep reviewBrowserTerminal

Project pending status

office-mac-mini

feature/discounts

What is the status of the discounts branch?Tom Reyes

Shellgit log --oneline feature/discounts -8

Eight commits since main: the coupon model, the checkout hook, and a migration. No PR yet.

Do we have a written plan for the discounts work?Priya Nair

No. You have no PLAN, TODO, or roadmap file.

Your closest thing to a plan is .coshell/review/dod.md: integer cents, handled promises, no focused tests, no dead exports.

Draft one from the commits and the dod file, then open it in the Plan tab.Lena Fischer

Readdod.md

Editdiscounts.md /docs/plans/+48−0

Drafted docs/plans/discounts.md with five steps. It is waiting for approval in the Plan tab.

Muse Spark 1.3 Free

ChatPlanReviewDeep reviewTerminal

Count to 120

acme-vm

main

Quick sanity check on Big Pickle before we let it near the repo. Say hi.Tom Reyes

Hi. Big Pickle here, ready when you are.

Without using any tools, list the first ten primes.Priya Nair

2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

Without using any tools, count from 1 to 120, one number per line, then stop.Lena Fischer

1
2
3
4
5
6
7
8
9
10
11
12

Thinking

Big Pickle

ChatPlanReviewDeep reviewTerminal

What Coshell adds on top of OpenCode.

OpenCode gives you the agent. Coshell gives that agent to your whole team, hosted and live. Every line below is a layer OpenCode does not ship, and every one is running in production today.

Persistent cloud drives

A drive is a workspace that stays warm in the cloud, with your files, terminal, and dependencies ready. Open it from any device.

Real-time multiplayer, same session

Several people prompt one agent in one live session at once, watching the same work land on the same running environment.

Overlap detection

When two agents reach for the same lines of the same file, an overlap layer catches it and holds the second edit before it clobbers, steering that agent to proceed if the changes are compatible, or to take other lines, wait, or let the first land first.

Per-session privacy

Keep a session private to you, share it with named teammates, or open it to the whole drive. Your call, per session.

Verified identity, contained credentials

Every action is tied to a verified identity that cannot be spoofed. Credentials are scoped to a single drive, with no master key to steal.

Integrated localhost browser

Run your app and see its localhost preview inside the session, shared with everyone on the drive, auto-reloading as the agent works.

CLI device-login

Log in once from your terminal with a device code, then attach to any drive by name. The same login, the same drives, everywhere.

Free to self-host

No seats, and nothing metered. Your whole team works on a drive you run, and adding a teammate never adds to the price.

On-prem enterprise

Run the whole thing on your own infrastructure with your own model keys, so your code never leaves your environment.

Your stock OpenCode CLI already works.

Coshell does not fork the protocol. Point the OpenCode CLI you already have at a drive and attach, and you are in the same live session as everyone else on it. No new client, no lock-in.

OpenCode vs Coshell, side by side.

	OpenCode	Coshell
What it is	The open-source agent engine	OpenCode, hosted, with the team layer added
Where it runs	Your machine or your own server	Managed cloud drives, or your own infra on enterprise
Players per session	One person, one session	Your whole team in one live session
Real-time multiplayer	Not built in	✓ Same live session, shared filesystem and terminal
Overlap detection		✓ Catches overlapping edits before they clobber
Load codebase once	Per person, per machine	✓ Loaded once, cached for the whole team
Per-session privacy		✓ Private, named, or open, per session
Integrated preview		✓ Shared localhost browser in the session
Models	Bring your own keys	70+ models on your own keys, scoped per drive
Works from	A terminal you set up	Any browser, plus the CLI
Pushes to real git
Setup	You host and maintain it	Nothing to host. Launch a drive and share it
Best for	One developer, self-managed	A whole team working with the agent together

Run your models where your data rules say they can go.

Use the included models through OpenCode's gateway, point Coshell at your own provider keys directly, or, on Enterprise, route everything through Amazon Bedrock in your own AWS account. The included models and your own provider keys each follow that provider's data terms. With Bedrock in your own AWS account, calls run in the AWS region you invoke, and AWS does not store, train on, or share your prompts and completions. Pick the path that fits your data rules.

Keep everything you know. Add the team.

The agent engine, the SDK, the providers, the MCP tools, the themes are all OpenCode, unchanged. The only thing new to learn is the layer Coshell adds: drives, multiplayer, privacy, verified-identity access, and your own model routing. Our docs map straight onto what you already use, and link back to OpenCode for the engine itself.

Read the Coshell docs Coming-from-OpenCode map

Built on OpenCode

Coshell vs OpenCode, answered

Is Coshell just OpenCode with a paywall?

No. Coshell is built on OpenCode and keeps it fully open underneath, including the CLI, SDK, and wire protocol. What Coshell adds is the hosted team layer OpenCode does not ship: persistent cloud drives, real-time multiplayer in one live session, overlap detection, per-session privacy, and per-drive auth. You can self-host OpenCode for free forever. Coshell is for teams who want that agent shared and hosted.

Can I use my existing OpenCode CLI with Coshell?

Yes. Coshell does not fork the protocol, so the stock OpenCode CLI attaches to a Coshell drive unchanged. Set OPENCODE_SERVER_PASSWORD to a per-drive token and run opencode attach against your drive's address. You are then in the same live session as everyone else on the drive.

What exactly does Coshell add that OpenCode does not have?

Persistent cloud drives, real-time multiplayer in one shared session, per-session privacy controls, verified-identity access control, an integrated localhost browser, CLI device-login, your own Amazon Bedrock, and on-prem enterprise. OpenCode provides the agent engine those layers sit on top of.

Is Coshell vs OpenCode a fair comparison, or different tools?

They are different layers of the same stack. OpenCode is the open-source agent engine that runs on one machine for one person. Coshell is the hosted product that takes that engine and makes it multiplayer for a whole team. Comparing them is really comparing single-player self-hosted against hosted multiplayer.

Do I lose anything by choosing Coshell over self-hosting OpenCode?

You keep the engine, the models on your own keys, and real git, and you can run on your own infrastructure on the enterprise tier. What changes is that you no longer host or maintain it yourself, and you gain the team layer. If you only ever work solo, self-hosted OpenCode is a perfectly good choice, and we will say so.

Built on OpenCode. Made for your team.

Start free

Keep the agent engine you trust. Add the live session your whole team works in together. Open a drive in the browser, or attach from the OpenCode CLI you already have.