Mcloud Local Agent Skill

Cloud CLI: Local Command

Execute mcloud local build to run a Cloud build on the local machine, mirroring how Cloud builds the project. Use it to debug build-failed deployments without pushing changes and waiting for a full Cloud build.

Constraints

• No --json flag. local build streams plaintext build output and signals the result through its exit code (0 = success). Do not parse its output as JSON.
• Requires Docker installed and running, and must run from inside the project's Git repository.
• Reproduces build-failed (build) failures only — not deployment-failed (runtime) failures. For runtime failures, use mcloud logs --deployment <id>.
• Available since mcloud CLI v0.1.10.
• The Docker build cache is disabled by default so variable changes always invalidate the cache; pass --docker-cache to enable it.

Command

local build

Run a Cloud build locally. Infers the root path and build variables from the linked Cloud project and environment. Builds the backend by default; pass --type storefront for the storefront.

mcloud local build \
  --organization <org-id> \
  --project <project-id-or-handle> \
  --environment <environment-handle>

Options:

• -o/--organization <id> — Organization ID (falls back to active context)
• -p/--project <id-or-handle> — Project ID or handle (falls back to active context)
• -e/--environment <handle> — Environment whose variables are used (falls back to active context)
• -t/--type <backend|storefront> — Build type (default: backend)
• --root-path <path> — Backend root path relative to the repo root (inferred if omitted; . if no Cloud project found)
• --storefront-path <path> — Storefront path relative to the repo root, for --type storefront (inferred if omitted)
• --env-file <path> — Use a local .env file instead of the Cloud environment's variables
• -v/--var <KEY=VALUE> — Override a single build variable; repeatable
• --docker-cache — Enable the Docker build cache (default: false)

Output:

• On success (exit 0), the backend image is tagged <repository-name>:cloud-local-build-<commit-hash>; a storefront build writes its output directory and prints the path.
• On failure (non-zero exit), the command exits with the failing step's error — debug it as you would a Cloud build.

Reproduce a Build Failure

Check out the same commit the failed deployment built so the local build matches, then route on the exit code:

# Identify the failing deployment and the commit it built
DEPLOYMENT_ID=$(
  mcloud deployments list --json \
    | jq -r '[.[] | select(.backend_status == "build-failed")][0].id'
)
COMMIT=$(mcloud deployments get "$DEPLOYMENT_ID" --json | jq -r '.commit_hash')

git checkout "$COMMIT"

if mcloud local build; then
  echo "Build succeeded locally; failure not reproducible from this commit."
else
  echo "Build failed locally; inspect the streamed output for the failing step."
fi

Once the local build exits 0, push the fix to the tracked branch and start a fresh Cloud build with mcloud environments trigger-build <env>.

Examples

# Reproduce the backend build for the active context
mcloud local build

# Reproduce the storefront build
mcloud local build --type storefront --storefront-path apps/storefront

# Test a build-variable fix without editing code
mcloud local build --var NODE_ENV=production

# Build against a local .env file
mcloud local build --env-file .env

# Reuse the Docker cache for a faster rebuild
mcloud local build --docker-cache