Tilt Up

Principles (Always Active)

These apply whenever working with Tiltfiles, Tilt errors, or dev environment bootstrap:

Fix the Tiltfile, Not the Symptoms

• Fix the source config directly - Tiltfile, Dockerfile, k8s manifest, or helm values
• Never add shell workarounds - no wrapper scripts, no || true, no try/except pass
• Never hard-code ports, paths, hostnames, image tags, or container names that should be dynamic
• Never add fallbacks that mask the real error - if a resource fails, the failure must be visible
• Never add sleep/retry loops for flaky dependencies - fix dependency ordering via resource_deps() or k8s_resource(deps=)
• Never add polling for readiness that Tilt already handles - use k8s_resource(readiness_probe=) or probe configs

Express Dependencies Declaratively

• Port conflicts: fix the port allocation source, don't pick a different port
• Resource ordering: use resource_deps(), not sequential startup scripts
• Env vars: use silo.toml or gen-env output, not inline defaults
• Image availability: use image_deps or deps, not sleep-until-ready

Tilt Live-Reloads

After editing a Tiltfile, Tilt picks up changes automatically. Never restart tilt up for:

• Tiltfile edits
• Source code changes
• Kubernetes manifest updates

Restart only for: Tilt version upgrades, port/host config changes, crashes, cluster context switches.

Workflow (When Explicitly Starting Tilt)

Step 1: Assess Current State

1. Check if tilt is already running:

   SESSION=$(basename $(git rev-parse --show-toplevel 2>/dev/null) || basename $PWD)
   tmux list-windows -t "$SESSION" -F '#{window_name}' 2>/dev/null | grep -q "^tilt$"
   

   If running, check health via tilt get uiresources -o json and skip to Step 3.

2. Check for required env files (.localnet.env, .env.local, silo.toml):

   • If silo.toml exists, use silo up path
   • If gen-env script exists, run it first
   • If neither, check project README for bootstrap instructions

3. Check for k3d cluster or Docker prerequisites.

Step 2: Start Tilt in tmux

Follow the tmux skill patterns:

SESSION=$(basename $(git rev-parse --show-toplevel 2>/dev/null) || basename $PWD)

if ! tmux has-session -t "$SESSION" 2>/dev/null; then
  tmux new-session -d -s "$SESSION" -n tilt
  tmux send-keys -t "$SESSION:tilt" 'tilt up' Enter
elif ! tmux list-windows -t "$SESSION" -F '#{window_name}' | grep -q "^tilt$"; then
  tmux new-window -t "$SESSION" -n tilt
  tmux send-keys -t "$SESSION:tilt" 'tilt up' Enter
else
  echo "Tilt window already exists in session: $SESSION"
fi

For silo projects: silo up instead of tilt up.

Step 3: Monitor Bootstrap

Poll for convergence:

1. Wait 10s for initial resource registration
2. Poll every 15s, up to 20 iterations:

   tilt get uiresources -o json | jq -r '.items[] | select(.status.runtimeStatus == "error" or .status.updateStatus == "error" or .status.updateStatus == "pending") | "\(.metadata.name): runtime=\(.status.runtimeStatus) update=\(.status.updateStatus)"'
   

3. Track resources: pending -> in_progress -> ok
4. Success: all resources reach runtime=ok, update=ok (or not_applicable)
5. If resources stabilize in error, proceed to Step 4

Step 4: Diagnose and Fix Errors

For each resource in error state:

1. Read logs: tilt logs <resource> --since 2m
2. Read the Tiltfile and relevant k8s manifests
3. Identify root cause in the config (not the running process)
4. Apply fix following the Principles above
5. Tilt live-reloads - re-poll status to verify

After 3 fix iterations on the same resource without progress:

• Report the error with full logs
• Identify whether it's a Tiltfile bug, upstream dependency, or infrastructure problem
• Do not silently skip or disable the resource

Step 5: Report

## Tilt Status: <healthy|degraded|errored>

**Resources**: X/Y ok
**Session**: tmux $SESSION:tilt

### Errors (if any)
- <resource>: <root cause> — <what was fixed or what remains>