Manifest reference

A service is described by one TOML file at .claude/skills/devboxes/<service>.toml. The filename is the service name, which may contain lowercase letters, digits, -, and _. Service names are shared across the org. A manifest holds facts about the service: where its code lives, what ports it listens on, how to set it up and start it, how to tell that it is healthy, and what it depends on. Decisions such as when to restart, when to run tests, or what else to install are made at the command line, not in the manifest.

Minimal

ports = [3000]

[run]
setup = "pnpm install"
dev   = "pnpm dev"

All fields

# .claude/skills/devboxes/api.toml

root  = "apps/api"           # working directory for the recipes, relative to the repo root
ports = [8080, 9229]         # ports the service listens on; the first is the primary port
size  = "large"              # box size its instances run on: small | standard | large | xlarge
box_address = true           # pages opened on bare localhost move to the box's own address

[run]
setup = "pnpm install"       # prepares the box; must be safe to run repeatedly
dev   = "pnpm dev"           # starts the server

[health]
path    = "/healthz"         # probed on the primary port; omit for a plain port check
timeout = "90s"              # how long to wait for the service to become healthy

[deps]
5001 = "worker"              # localhost:5001 on this box reaches worker's primary port
5432 = "db"                  # any TCP service
9091 = "search:9090"         # a specific port of a dependency

[env]
files    = [".env.local"]    # gitignored files that sync should include anyway
required = ["DATABASE_URL"]  # names only; values are set with `tesser env set`

Field by field

Field	Default	Meaning
`root`	`"."`	The working directory for `setup` and `dev`, relative to the repository root. In a monorepo, point it at the service’s package.
`ports`	required	The loopback ports the service binds. The first one is the primary port: it is what a bare dependency binding reaches and what the health check probes. The service may bind loopback or all interfaces; Tesser exposes the declared ports to the org’s other boxes through the box’s mesh ingress.
`size`	`"standard"`	The box size this service’s instances launch on: `small` (1 vCPU, 4 GB), `standard` (2 vCPU, 8 GB), `large` (4 vCPU, 16 GB), or `xlarge` (8 vCPU, 32 GB). `tesser make <service> --size <size>` overrides it for one box.
`box_address`	`false`	When `true`, a page opened on bare `localhost:<port>` for one of this service’s boxes moves to that box’s own address, `http://<box_id>.localhost:<port>`, on the same path. Set it when the app only works on its box’s address, for example a frontend that calls its API on another port with cookies. API calls and sockets are never moved.
`run.setup`	required	Runs before `dev` on every start, and on a shared instance’s first boot, so it must be idempotent. `pnpm install` is the usual value.
`run.dev`	required	The command that starts the server. Dev boxes run it against the synced worktree; shared instances run it against the checked-out commit.
`health.path`	port check	An HTTP path that must return a 2xx status on the primary port before the instance counts as healthy. Without it, a process listening on the primary port is enough.
`health.timeout`	`"90s"`	How long `dev` and a shared instance rollover wait for the service to become healthy. Accepts values such as `"500ms"`, `"90s"`, or `"2m"`.
`[deps]`	none	Entries of the form `localPort = "service"` or `"service:port"`. Each key becomes a loopback port on this box (and on the laptop while this box is selected) that reaches the named service — the box it is wired to with `tesser wire`, otherwise the org’s shared instance, which is started or woken before this service starts.
`env.files`	none	Gitignored files, relative to `root`, that sync ships anyway: on every sync to a dev box, and copied from the creating laptop’s worktree when a shared instance is created.
`env.required`	none	Names of env variables a shared instance needs. Values are set with `tesser env set <service> KEY=VALUE`. Starting a shared instance with any of these unset fails with a message naming the missing variable.

Rules

Bind declared ports however the app prefers — 127.0.0.1 or 0.0.0.0 both work, and Tesser never binds them itself. Other boxes reach a declared port only through the box’s mesh ingress, and the org’s network exposes nothing else, so an all-interfaces bind is not public. Pin the port in the dev server’s config so a collision fails loudly instead of silently drifting to the next port and breaking routing.
The service’s own ports and its [deps] keys share the box’s loopback port space, so a port cannot appear in both.
When a repository has several manifests, dev and make require the service name. When it has one, that service is the default.
Unknown keys are rejected, and the error message lists the keys that exist.
Secret values do not belong in a manifest. The [env] table holds names and file lists only, because the manifest is committed to the repository.
Dependencies are names, never addresses. Which box a name reaches is decided for each box at run time, as described in Connect a frontend to a backend.

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Manifest reference

Minimal

All fields

Field by field

Rules

​Minimal

​All fields

​Field by field

​Rules

Minimal

All fields

Field by field

Rules