Freestyle Provider

Read when:

• choosing provider: freestyle;
• configuring Freestyle VM size or workdir;
• changing internal/providers/freestyle.

Freestyle is a delegated run provider. Crabbox uses the Freestyle v1 REST API (https://api.freestyle.sh) for VM lifecycle, archive sync, and command execution through pure Go net/http calls. Freestyle owns VM state and exec transport; Crabbox owns local config, repo claims, sync manifests and guardrails, slugs, timing summaries, and normalized list/status rendering.

#When To Use

Use Freestyle when the remote Linux VM should be owned by Freestyle and commands can run through Freestyle's exec API. Use AWS, Hetzner, Static SSH, or Daytona when you need Crabbox SSH access.

#Commands

crabbox warmup --provider freestyle --keep
crabbox run --provider freestyle -- pnpm test
crabbox run --provider freestyle --sync-only
crabbox run --provider freestyle --id blue-lobster --shell 'pnpm install && pnpm test'
crabbox status --provider freestyle --id blue-lobster
crabbox stop --provider freestyle blue-lobster
crabbox list --provider freestyle
crabbox doctor --provider freestyle

#Live Smoke

Use a live smoke when changing Freestyle lifecycle, sync, or exec code. Keep the API key in FREESTYLE_API_KEY; do not pass it as a command-line argument.

export FREESTYLE_API_KEY=...
go build -trimpath -o bin/crabbox ./cmd/crabbox

bin/crabbox run --provider freestyle --keep 'bash test.sh'
bin/crabbox warmup --provider freestyle --actions-runner   # expect exit 2
bin/crabbox doctor --provider freestyle

Expected results:

• run prints a Freestyle lease (fsb_...), sync summary, command output, and

exit=0.

• warmup --actions-runner is rejected because Freestyle does not register

GitHub Actions runners.

• doctor reports inventory readiness when auth and list calls succeed.

#Auth

export FREESTYLE_API_KEY=...

CRABBOX_FREESTYLE_API_KEY is also accepted and wins over FREESTYLE_API_KEY.

Freestyle API keys must not be passed as CLI flags. Crabbox reads them from environment variables only.

FREESTYLE_API_URL, CRABBOX_FREESTYLE_API_URL, or freestyle.apiUrl in the user config can override the default https://api.freestyle.sh. Repository config cannot override this credential destination. Custom endpoints must use HTTPS, except for loopback development URLs. Crabbox refuses cross-origin redirects so the bearer token cannot be forwarded to another origin.

#Config

provider: freestyle
target: linux
freestyle:
  apiUrl: https://api.freestyle.sh
  workdir: crabbox
  # Optional. Omit both to use the Freestyle plan defaults
  # (4 vCPU / 8 GiB / 20 GB). vcpus and memoryGB must each be a
  # power of two. Setting them on a plan without custom-sizing
  # entitlement fails with CUSTOM_SIZING_NOT_ALLOWED.
  vcpus: 4
  memoryGB: 8

Provider flags:

--freestyle-api-url
--freestyle-workdir
--freestyle-vcpus
--freestyle-memory-gb

--freestyle-workdir / freestyle.workdir is interpreted as a relative directory below /workspace. Crabbox rejects absolute paths and .. escapes before workspace preparation and sync.

#Lifecycle

1. Create or resolve a Crabbox-owned Freestyle VM.
2. Store a local lease ID with the fsb_ prefix and a friendly slug.
3. Validate the Freestyle workdir, build the Crabbox sync manifest, and upload a

gzipped archive into /workspace/<freestyle.workdir>.

4. Execute commands through Freestyle's exec API in that workdir via bash -lc.
5. Stop deletes the VM and removes the local lease claim.

#Sync

Freestyle advertises archive sync (FeatureArchiveSync). Crabbox supports --sync-only, --force-sync-large, and --no-sync.

Crabbox creates Freestyle VMs with an explicit empty external-port list. No guest service is publicly exposed by default.

When sync.delete is enabled, Crabbox extracts into a staging directory and replaces the retained workspace only after extraction succeeds. Failed uploads leave the prior workspace intact. sync.timeout bounds archive creation, upload, extraction, and replacement.

Archive upload tries Freestyle's file API first. When that endpoint is unavailable, Crabbox falls back to chunked base64 upload through exec. Sync still completes reliably through the fallback path.

The raw VM ID, Crabbox VM name, and generated slug shown by crabbox list can recover a Crabbox-owned VM after local claim state is lost.

--checksum is not supported because Freestyle uses archive sync rather than Crabbox rsync checksum mode.

#Limitations

• --actions-runner is not supported for warmup or run.
• --checksum is not supported.
• No SSH lease path; this is delegated run only.
• API keys are env-only; there is no --freestyle-api-key flag.

#Doctor

crabbox doctor --provider freestyle checks auth and lists Crabbox-owned VMs in the Freestyle account. It does not create a VM during the check.