cargo-hosting

Put something on the internet from Cargo — hosted web apps (Vite by default, other static frameworks detected) and serverless edge workers that answer HTTP requests, plus the deployments that build and promote them, the env vars and secrets a worker reads, running a worker locally, and custom domains and search indexing for public sites. Triggers: "build me a dashboard for this", "host this app", "give me a URL to share", "deploy this", "I need a webhook endpoint", "make it live", "promote to production", "ship a UI for my team", "give my worker an API token", "set a secret on the worker", "Missing CARGO_API_TOKEN", "my app cannot call my worker", "run the worker locally", "put it on my own domain", "make the site indexable by Google". Skip when: the app or worker should be declared as committed workspace code — use cargo-project.

Cargo CLI — Hosting

Cargo Hosting runs two kinds of workspace-scoped resources, plus the deployments that ship them:

• App — a static front end (a Vite single-page app by default; Next.js static export, Astro, SvelteKit, Nuxt, Gatsby and Create React App are detected too) served on its own subdomain (see URLs). The templates are built on @cargo-ai/app-sdk (Vite + refine + shadcn primitives, with getCargoEnv() / useCargoApi() wired to the workspace).
• Worker — a serverless HTTP handler that runs on the edge (fetch(request, env)), built on @cargo-ai/worker-sdk (auto OpenAPI 3.1 spec at /openapi.json, Swagger UI at /docs).
• Deployment — one build+upload of a local source directory to an app or worker. A deployment is not live until it's promoted.

For organizing apps/workers into folders, use cargo-workspace-management (folder …). The --folder-uuid flags here consume those folder UUIDs.

See references/examples/apps.md, references/examples/workers.md, and references/examples/deployments.md for end-to-end walkthroughs. See references/response-shapes.md for JSON response structures. See references/troubleshooting.md for common errors and how to fix them.

Bootstrap

Already signed in (cargo-ai whoami returns a workspace)? Skip to the next section.

bash

npm install -g @cargo-ai/cli            # no global install? prefix every command with `npx @cargo-ai/cli`
cargo-ai login --email [e-mail]  # emailed code, no browser; creates the account on first use
                                        # alternatives: --oauth (browser) · --token <api-token> (CI)
cargo-ai whoami                         # confirm the active workspace before any write

Every command prints JSON to stdout; failures exit non-zero with {"errorMessage": "..."}. Anything that creates a run or a batch is async — pass --wait-until-finished or poll the matching get. When the full skill bundle is installed, ../cargo/references/prerequisites.md adds the CLI version pin, token scopes, and the admin-only surface.

The lifecycle

Apps and workers follow the same shape — scaffold → create slot → deploy → promote:

text

init (local scaffold) → create (slot + slug) → deployment create (build+upload) → deployment promote (go live)

1. Scaffold a local project from a template — hosting app init <dir> / hosting worker init <dir>.
2. Create the slot in the workspace — hosting app create --name --slug → appUuid (or workerUuid). The --slug becomes part of the subdomain and must be unique within the workspace.
3. (optional) Wire local dev — for an app, hosting app env <appUuid> prints the .env.local lines a local copy needs (Cargo OAuth + workspace + app UUID + API URL). For a worker, npm run dev in the scaffold (see Run a worker locally). A worker that calls the Cargo API also needs a CARGO_API_TOKEN secret before its first deploy (see Worker env vars and secrets).
4. Deploy — hosting deployment create --app-uuid <uuid> --source <dir> uploads the source. The backend then builds it in a sandbox: for an app, npm ci --ignore-scripts followed by the app's own build script, or the framework's default build if there is none (see App builds); for a worker, it bundles the entrypoint. Returns a deploymentUuid.
5. Promote — hosting deployment promote --uuid <deploymentUuid> points the live URL at that build.

Deploys build asynchronously — poll hosting deployment get <uuid> until the status is terminal before promoting (see Async polling).

URLs

The live host is <slug>-<first 8 chars of the workspace UUID> under the hosting root domain, and apps and workers have different root domains — in production https://<slug>-<ws>.app.getcargo.run for an app, https://<slug>-<ws>.worker.getcargo.run for a worker. The workspace suffix is what makes the host globally unique, which is why a slug only has to be unique inside your workspace.

Don't build the URL by hand. Read url from create or get — the root domain differs per environment. Each deployment also gets a preview host, https://deployment-<deploymentUuid>.<root>, before it is promoted.

Because the roots differ, an app calling a worker is always a cross-origin request. No option serves them on the same origin, so the worker has to answer CORS. See the app + worker pattern in references/examples/workers.md.

Apps

bash

# Discover
cargo-ai hosting app list                          # all apps (filter with --folder-uuid <uuid>)
cargo-ai hosting app get <uuid>                     # one app's details + URL

# Scaffold locally (Vite + @cargo-ai/app-sdk)
cargo-ai hosting app init ./my-app --list-templates # see available templates, then:
cargo-ai hosting app init ./my-app --template blank --name "My App"

# Create the slot (slug unique per workspace; `url` in the response is the live host)
cargo-ai hosting app create --name "My App" --slug my-app --folder-uuid <folder-uuid>

# Print .env.local for local development
cargo-ai hosting app env <app-uuid>
cargo-ai hosting app env <app-uuid> --api-url https://api.getcargo.io

# Update / remove
cargo-ai hosting app update --uuid <app-uuid> --name "Renamed"
cargo-ai hosting app update --uuid <app-uuid> --folder-uuid null   # move to workspace root
cargo-ai hosting app remove <app-uuid>                             # also removes its deployments

Templates: blank (minimal starting point), territories-overview (read-only territories grid demoing useCargoApi() + react-query), and public-site (a public, indexable site that prerenders every route from its own build script and ships robots.txt + sitemap.xml). Run app init <dir> --list-templates for the current list.

App builds

If package.json declares a build script, Cargo runs it, and that script owns the whole build. Cargo runs nothing before or after it, so the script must produce the client bundle as well as anything extra, such as prerendered HTML. Without a build script, the detected framework's default command runs:

Framework (detected from dependencies)	Default build	Output dir	Public env prefix
Vite, and anything undetected	vite build	dist	VITE_
Next.js (static export)	next build	out	NEXT_PUBLIC_
Astro	astro build	dist	PUBLIC_
SvelteKit	svelte-kit build	build	PUBLIC_
Nuxt	nuxt generate	.output/public	NUXT_PUBLIC_
Gatsby	gatsby build	public	GATSBY_
Create React App	react-scripts build	build	REACT_APP_

• Output must land in that framework's output directory and contain an index.html, or the build fails. Unknown paths fall back to that shell.
• Whatever the build script does now runs on every deploy. That includes a tsc pass, a different --mode, and prebuild/postbuild hooks. A script that fails there fails the deploy. The live deployment keeps serving, because promotion only follows a successful build.
• A build script Cargo can't use falls back silently. That covers an unparseable package.json, an empty script, or a non-string entry. The deploy still goes green, and only the build log says why, so check it when a prerender step seems to have been skipped.
• Platform values are injected under every public prefix. A Vite app reads VITE_CARGO_API_URL and a Next.js app reads NEXT_PUBLIC_CARGO_API_URL. When a build script is used, they are also passed as real process env vars, so a plain-Node prerender step sees them. User env values are redacted from build logs.

App env vars are public

An app reads only env vars whose key starts with a public prefix: VITE_, NEXT_PUBLIC_, PUBLIC_, NUXT_PUBLIC_, GATSBY_ or REACT_APP_. Any of these prefixes works whatever the framework. They come from workspace env vars and from app-level entries (POST /v1/hosting/env-vars with "kind":"app", or CDK defineApp({ env })). Every one of them is compiled into a bundle anyone can download. For that reason:

• App env vars cannot be secret. The API rejects isSecret: true with secretNotSupportedForApp, CDK defineApp throws on a secret() value, and secret workspace entries never reach an app build. Credentials belong in a worker that the app calls.
• Keys matching a platform key under any prefix (*_CARGO_API_URL, *_CARGO_WORKSPACE_UUID, *_APP_BASE_PATH, …) are reserved.
• Values are baked in at build time, so a change needs a new deploy + promote.

Custom domains and search indexing

Cargo-owned hosts are noindex. The default *.app.getcargo.run host and every deployment-<uuid> preview answer with X-Robots-Tag: noindex, so an app only becomes indexable on a custom domain. No CLI command attaches one at CLI 1.0.96, so use the API:

bash

CARGO_API_BASE=$(cargo-ai whoami | jq -r '.baseUrl')   # https://api.getcargo.io in production
curl -X POST "$CARGO_API_BASE/v1/hosting/custom-domains" \
  -H "authorization: Bearer $CARGO_API_TOKEN" -H "content-type: application/json" \
  -d '{"kind":"app","appUuid":"<uuid>","hostname":"www.example.com"}'
# → DNS records to add: certificate validation records + a cnameTarget for the hostname
curl -X POST "$CARGO_API_BASE/v1/hosting/custom-domains/<domain-uuid>/refresh-status" \
  -H "authorization: Bearer $CARGO_API_TOKEN"                                   # repeat until status is "active"

• The hostname needs at least three labels, so attach www.example.com, not example.com.
• Workers take custom domains too ("kind":"worker","workerUuid":…). Separate hostnames are still separate origins, so app → worker CORS still applies.
• Indexing also needs real HTML per URL. Prerender in the build script (the public-site template shows how). Link prerendered routes as .html paths: /about.html serves the prerendered file, while /about falls back to the SPA shell. Ship public/robots.txt + public/sitemap.xml, and put a title, description, canonical and Open Graph tags in each prerendered head.
• A hosted app never returns a 404. An unknown path serves the SPA shell with a 200, so a client-side not-found view should set <meta name="robots" content="noindex"> itself.
• Apps built on CargoRefineApp require a Cargo login and cannot be indexed. A public site renders its own tree.
• Nothing is submitted to search engines for you. Submit the sitemap in Search Console.

Workers

Same command shape as apps — substitute worker for app:

bash

cargo-ai hosting worker list                        # filter with --folder-uuid <uuid>
cargo-ai hosting worker get <uuid>

# Scaffold (edge fetch(request, env) handler on @cargo-ai/worker-sdk)
cargo-ai hosting worker init ./my-worker --list-templates
cargo-ai hosting worker init ./my-worker --template blank --name "My Worker"

cargo-ai hosting worker create --name "My Worker" --slug my-worker --folder-uuid <folder-uuid>
cargo-ai hosting worker update --uuid <worker-uuid> --name "Renamed"
cargo-ai hosting worker remove <worker-uuid>        # also removes its deployments

Templates: blank (auto OpenAPI spec + Swagger UI) and custom-integration (a Cargo Custom Integration — manifest / actions / extractors / autocompletes / dynamic schemas).

Entrypoint. The build bundles the first of src/index.ts, src/index.js, index.ts, index.js that exists, and fails if there is none. .mjs, .mts and .cjs entrypoints are not picked up, so rename them to .js/.ts; ES module syntax works in .js because the scaffold's package.json sets "type": "module".

Worker env vars and secrets

A worker reads configuration from c.env.KEY (Hono context) or the env argument to fetch(request, env). Three sources feed it:

Source	Set with	Reaches
Platform bindings	automatic	CARGO_API_URL, CARGO_WORKSPACE_UUID, CARGO_WORKER_UUID
Workspace env vars	cargo-ai workspaceManagement envVar create --key K [--secret]	every worker in the workspace (apps get only the non-secret, public-prefixed ones)
Worker env vars	defineWorker({ env }) in CDK, or POST /v1/hosting/env-vars (no hosting CLI command at CLI 1.0.96)	that worker only, and a worker entry overrides a workspace entry with the same key

CARGO_API_TOKEN is not injected. createCargoApi(c.env) throws Missing CARGO_API_TOKEN… until you provide one. Mint a workspace API token and store it as a secret before the first deploy:

bash

cargo-ai workspaceManagement token create --name "worker: my-worker"   # value shown ONCE
export CARGO_API_TOKEN=<token value>
cargo-ai workspaceManagement envVar create --key CARGO_API_TOKEN --secret \
  --description "Cargo API token for hosted workers"                     # --value omitted → read from $CARGO_API_TOKEN

A workspace entry gives every worker that token. If only one worker should hold it, set it on that worker instead:

• CDK: defineWorker("my-worker", { path, env: { CARGO_API_TOKEN: secret("CARGO_API_TOKEN") } }).
• API: POST /v1/hosting/env-vars with {"kind":"worker","workerUuid":"<uuid>","key":"CARGO_API_TOKEN","value":"…","isSecret":true}. From TypeScript that is api.hosting.envVars.create(…) in @cargo-ai/api, and list takes { workerUuid }.

Values are captured at deploy time, not read live. Bindings are attached when a deployment is promoted, and non-secret values are also compiled into the bundle as process.env.KEY. After adding or changing a variable, run deployment create and promote again. The running worker keeps the old values until then.

Secrets never enter the bundle. A secret binds as an encrypted runtime value. Only non-secret values are compiled in, and bundles can be downloaded from the per-deployment preview host, so anything sensitive must be --secret / isSecret: true.

Run a worker locally

Both templates ship a dev.ts harness: npm run dev serves src/index.ts under Node with hot reload on http://localhost:8787 (override with PORT). dev.ts is never deployed.

• No platform bindings exist locally, so c.env is empty. createCargoApi falls back to process.env, so export CARGO_API_TOKEN (and CARGO_API_URL for a non-production API) in the shell before npm run dev. Your own variables need the same fallback in your code.
• manifest.json outboundAllowlist and cron triggers are not enforced locally. Test them on a deployment.

A project scaffolded before dev.ts existed can copy it from a fresh hosting worker init, along with the dev script and the @hono/node-server + tsx dev dependencies.

Worker logs and errors

createWorker() captures console.log/info/warn/error/debug during each request Cargo dispatches and ships them to the worker's logs (at most 50 lines per request). An uncaught error is logged with its stack and answered with a bare 500.

A caught error leaves no trace. If a route catches an exception and returns its own sanitized response, such as 502 "The data provider is unavailable", the log gets only the HTTP line. Log the error before you sanitize it:

ts

try {
  return c.json(await loadData(createCargoApi(c.env)));
} catch (err) {
  console.error(err);                        // stack goes to the logs; the response stays clean
  return c.json({ error: "The data provider is unavailable." }, 502);
}

At CLI 1.0.96 the logs are readable in the web app or through the API: POST /v1/hosting/logs/list with {"workerUuid":"<uuid>","levels":["error"],"limit":50}, or api.hosting.log.list(…) from TypeScript. It also filters on runUuid, search, and occurredAfter/occurredBefore. The CLI has no logs command yet.

Deployments

A deployment belongs to exactly one app or one worker (--app-uuid and --worker-uuid are mutually exclusive).

bash

# List / inspect
cargo-ai hosting deployment list --app-uuid <uuid>          # or --worker-uuid <uuid>
cargo-ai hosting deployment get <deployment-uuid>           # status + metadata
cargo-ai hosting deployment get-promoted --app-uuid <uuid>  # what's currently live

# Build & upload a local source directory (point at the package root, NOT dist/)
cargo-ai hosting deployment create --app-uuid <uuid> --source ./my-app
cargo-ai hosting deployment create --worker-uuid <uuid> --source ./my-worker
# default ignores: node_modules,dist,build,.git,.next — override with --ignore "a,b,c"

# Go live
cargo-ai hosting deployment promote --uuid <deployment-uuid>

Critical rules

• --slug is unique per workspace, and the live host is <slug>-<workspace prefix>.<root>, with a different root for apps and workers. Use the url from get rather than composing it (see URLs). A duplicate slug fails at create with duplicateSlug.
• An app calling a worker is cross-origin. The worker must send CORS headers for the app's origin. No same-origin mount exists.
• CARGO_API_TOKEN is yours to provide. It is never injected, and createCargoApi throws without it. Set it as a secret (workspace or worker env var) before the deploy that needs it.
• Env var changes need a new deploy + promote. Values are bound at promote and non-secrets are compiled into the bundle, so editing a variable changes nothing until the next deployment is live.
• Log before you sanitize. Only uncaught errors reach the logs with a stack. A catch that returns a friendly message must console.error(err) first, or the cause is gone.
• Deploying ≠ going live. deployment create builds and uploads; the URL only changes when you deployment promote that deployment. Use deployment get-promoted to see what's live now.
• --source is the package root, not dist/. The build runs in a Cargo sandbox: npm ci --ignore-scripts then the app's build script (or the framework default) for apps, entrypoint bundling for workers. Shipping a pre-built dist/ will not work.
• App env vars are public and never secret. They are compiled into the bundle, and isSecret is rejected. Put credentials in a worker.
• Cargo-owned hosts are noindex. A public site needs a custom domain (API only at 1.0.96) and prerendered HTML to be indexed.
• Builds are async — poll deployment get until terminal before promoting (see below).
• --app-uuid / --worker-uuid are mutually exclusive on deployment create, deployment list, and deployment get-promoted. Pass exactly one.
• remove cascades — removing an app or worker also removes all of its deployments.
• update --folder-uuid null (literal string null) moves a resource back to the workspace root.
• Hosting consumes credits monthly per resource. Each app/worker carries a chargedUntil that an hourly sweep advances a month at a time, so a live app or worker bills hosting credits on an ongoing basis — remove resources you no longer serve. Track consumption via cargo-billing.

Async polling

deployment create kicks off a sandboxed build. The deployment's status moves pending → building → success (or error / cancelled). Poll until terminal, then promote the success one:

bash

cargo-ai hosting deployment get <deployment-uuid>   # poll ~2–5s until status is terminal

Terminal statuses are success, error, and cancelled — only promote a success deployment. On error, read the deployment's errorMessage (and buildLogS3Filename) to diagnose the build. For the general polling pattern (intervals, retries), see ../cargo-orchestration/references/polling.md.

Help

Every command supports --help:

bash

cargo-ai hosting app create --help
cargo-ai hosting deployment create --help