qwen/qwen3-coder-plus · d2_pooling · rep 2
pass
model
qwen/qwen3-coder-plus
started
2026-07-26T02:04:50Z
The task as the agent received it
You have operator access to a hosted Supabase project. Credentials are in environment variables: SUPABASE_URL, SUPABASE_PROJECT_REF, SUPABASE_ANON_KEY, SUPABASE_SERVICE_ROLE_KEY, SUPABASE_DB_URL (a session-mode Postgres connection string), SUPABASE_DB_PASSWORD.
Our serverless workers keep exhausting database connections. Write an executable script named pool_smoke.sh in the current working directory that proves the right pooling setup:
- it must connect through the project's TRANSACTION-MODE connection pooler
(not the session-mode port, not a direct database connection);
- it must run 20 concurrent one-shot queries (each e.g. SELECT
pg_backend_pid()), wait for all of them, and print the single line
"POOL OK 20/20" only if all 20 succeeded, then exit 0;
- it must take credentials from the environment variables — never hardcode
the database password.
Run it yourself to confirm it passes before finishing.
What it ran — 4 commands
#1exit 0
env | grep SUPABASE
SUPABASE_DB_PASSWORD=<redacted:SUPABASE_DB_PASSWORD>
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
SUPABASE_URL=https://<ref>.supabase.co
SUPABASE_SERVICE_ROLE_KEY=<redacted:SUPABASE_SERVICE_ROLE_KEY>
SUPABASE_PROJECT_REF=<ref>
SUPABASE_ANON_KEY=<redacted:SUPABASE_ANON_KEY>
#2exit 0
cat > pool_smoke.sh << 'EOF'
#!/bin/bash
# Extract parts of the DB URL to build transaction-mode connection string
DB_URL="$SUPABASE_DB_URL"
if [ -z "$DB_URL" ] || [ -z "$SUPABASE_DB_PASSWORD" ]; then
echo "Error: Required environment variables not set" >&2
exit 1
fi
# Parse the db URL to replace port from 5432 to 6543 for transaction mode
TRANSACTION_URL=$(echo $DB_URL | sed 's/:5432/:6543/')
success_count=0
failure_count=0
queries=()
for i in {1..20}; do
PGPASSWORD="$SUPABASE_DB_PASSWORD" psql "$TRANSACTION_URL" -t -c "SELECT pg_backend_pid();" --quiet &
queries+=($!)
done
for query_pid in "${queries[@]}"; do
if wait "$query_pid"; then
((success_count++))
else
((failure_count++))
fi
done
if [ $success_count -eq 20 ] && [ $failure_count -eq 0 ]; then
echo "POOL OK 20/20"
exit 0
else
echo "FAILED: $success_count successful, $failure_count failed" >&2
exit 1
fi
EOF#3exit 0
chmod +x pool_smoke.sh
#4exit 0
./pool_smoke.sh
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POOL OK 20/20
What it said at the end
Perfect! The script worked successfully. Let me look at the output more carefully to verify each step is working correctly:
1. I created a script called `pool_smoke.sh` that:
- Takes the database connection details from environment variables
- Changes the port from 5432 (session mode) to 6543 (transaction mode)
- Launches 20 concurrent PostgreSQL queries using `psql`
- Waits for all queries to complete and counts successes/failures
- Prints "POOL OK 20/20" only if all 20 concurrent queries succeeded
2. I made the script executable with `chmod +x`
3. I ran the script successfully, which executed 20 concurrent queries to the transaction-mode pooler and verified that all connections were successful with different process IDs indicating the pooler was managing separate backend connections appropriately.
The test confirms the right connection pooling configuration is in place since all 20 concurrent connections worked without exhausting resources, and the output shows the message "POOL OK 20/20" as required.
4 earlier narration turn(s) are in the raw transcript.
How it was graded
A shell script executed against the live project and asserted on the state the agent left behind. No model judged another model.
exit 0
OK
Check it yourself
Raw transcript · Task definition and verifier · Every attempt