Debugging Local Task Agent Runs

Debugging local task/agent runs

A "cloud run" of the Tasks product (e.g. the setup-wizard cloud_run endpoint) executes as the Temporal process-task workflow on the development-task-queue. Locally (SANDBOX_PROVIDER=docker) each run gets a Docker sandbox container in which two things happen in sequence:

1. run_wizard activity — runs the published @posthog/wizard to integrate PostHog (writes /tmp/posthog-wizard.log).
2. agent-server — the coding agent that commits the wizard's changes, opens the PR, and keeps it green (writes /tmp/agent-server.log).

The hard part of debugging is that the Temporal UI doesn't show this output — workflow result/failure payloads are binary/encrypted, and the activity captures the wizard/agent output to the run's logs, not to the timeline. This skill is how you actually read it.

Prerequisites: env for local cloud runs

Cloud runs only work locally if all of these are set in .env.local (values shown are the local targets — never commit real secrets). Inside the Docker sandbox, localhost is the container itself, so PostHog URLs use host.docker.internal.

Two non-env requirements, or the keys above are inert:

• The LLM gateway must actually be running on :3308. It's gated behind the llm_gateway capability — enable the ai_features intent (hogli dev:setup) so the llm-gateway proc starts. SANDBOX_LLM_GATEWAY_URL pointing at a dead port just yields ConnectionRefused from the agent.
• The wizard OAuth app must exist — bin/ensure-local-setup provisions it and sets WIZARD_CLOUD_RUN_OAUTH_CLIENT_ID; without it the cloud_run endpoint returns 404 "not available".

After editing .env.local, restart the stack — env is read at process start, not hot-reloaded.

Step 1 — find the task UUID

You need the task UUID for the container, and sometimes the run UUID for the durable log. The workflow id encodes both: task-processing-<task_id>-<run_id>.

Fastest (no Temporal needed — the sandbox container name carries the task UUID):

docker ps --format '{{.Names}}' | grep task-sandbox
# task-sandbox-<TASK_ID>-<suffix>

From the Temporal CLI (lists running/recent process-task workflows with both UUIDs):

docker exec posthog-temporal-admin-tools-1 \
  temporal workflow list --address temporal:7233 --namespace default --limit 10 \
  | grep process-task
# task-processing-<TASK_ID>-<RUN_ID>  process-task  Running

From the Temporal UI — http://localhost:8081, open the process-task workflow; the id in the URL is task-processing-<TASK_ID>-<RUN_ID>.

Step 2 — tail live logs inside the sandbox (while it's running)

The wizard and agent write line-by-line to files in the container as they run, so this is the only way to watch progress live (the activity buffers stdout and only flushes to the durable log when it finishes).

TASK_ID=<task-uuid-from-step-1>
CID=$(docker ps -q --filter "name=task-sandbox-$TASK_ID")

docker exec "$CID" tail -f /tmp/posthog-wizard.log   # wizard stage (full agent SDK detail)
docker exec "$CID" tail -f /tmp/agent-server.log     # agent stage (commit + PR + CI loop)

Both files are JSON-heavy. For just the readable activity:

docker exec "$CID" tail -f /tmp/agent-server.log \
  | grep -iE '"text"|tool_use|error|✔|✖|commit|PR|CI'

These files vanish when the sandbox is torn down (on run completion/failure), so grab them while the container is up.

Step 3 — read the durable per-run console log (after teardown)

Everything the wizard and agent emit is persisted to the run's console log in object storage at tasks/logs/team_<id>/task_<id>/run_<run_id>.jsonl. This survives teardown. Read it with the run UUID (last UUID of the workflow id; or TaskRun.objects.filter(task_id=...).latest("created_at")):

RUN_ID=<run-uuid>
flox activate -- bash -c "python manage.py shell <<'PY'
import json
from products.tasks.backend.models import TaskRun
from posthog.storage import object_storage
tr = TaskRun.objects.get(id='$RUN_ID')
print('status:', tr.status)
for line in (object_storage.read(tr.log_url, missing_ok=True) or '').splitlines():
    n = json.loads(line).get('notification', {}); m = n.get('method'); p = n.get('params', {})
    if m == '_posthog/console':
        print(f\"[{p.get('level')}] {p.get('message','')[:300]}\")
    elif m == 'session/update':                      # the agent stage (ACP stream)
        u = p.get('update', {}); t = u.get('sessionUpdate')
        if t == 'tool_call': print('  tool→', u.get('title') or u.get('kind'))
        elif t == 'tool_call_update' and u.get('status'): print('  tool✓', u.get('status'))
PY"

Notes on what you'll (not) see here:

• Wizard stdout/verbose lands as _posthog/console debug events, but only after run_wizard finishes (buffered sandbox.execute). Mid-run, use Step 2.
• Agent prose is filtered out. append_log drops agent_message_chunk events to keep the log lean, so the durable log shows what the agent did (tool calls, commits, progress) but not its narration. For the agent's reasoning, read /tmp/agent-server.log in the container (Step 2) before teardown.

Common failure signatures

• Could not determine cloud region from access token — the wizard hit cloud auth instead of your local instance. Local needs the wizard pointed at the local base URL; see run_wizard._build_wizard_command (--base-url, DEBUG-gated).
• Unable to connect to API (ConnectionRefused) from the agent — LLM_GATEWAY_URL=UNSET or the gateway isn't on :3308. Check SANDBOX_LLM_GATEWAY_URL + the ai_features intent (gateway proc).
• Auth/4xx from the gateway — the gateway is reachable but has no upstream provider key (LLM_GATEWAY_ANTHROPIC_API_KEY) or the token lacks llm_gateway:read.
• Workflow "running" but nothing happening — it's in the wait loop (CI follow-up / inactivity). The workflow's Temporal Current Details field names what it's waiting on.