Can Agents Run It? · evidence — Issue 1: Supabase

google/gemini-3.1-pro-preview · d2_pooling · rep 3

pass
model
google/gemini-3.1-pro-preview
task
d2_pooling
rep
3
day
2
steps
5
tokens
12,763
est. cost
$0.077
agent time
56s
wave
s4
started
2026-07-24T05:02:44Z

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 — 5 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
psql -d "${SUPABASE_DB_URL/:5432/:6543}" -c "SELECT pg_backend_pid()"
 pg_backend_pid 
----------------
           8341
(1 row)

#3exit 0
cat << 'EOF' > pool_smoke.sh
#!/bin/bash

# Supabase session connection uses port 5432, transaction mode uses 6543.
TRANSACTION_URL="${SUPABASE_DB_URL/:5432\//:6543\/}"

# Output dir for results
TMPDIR=$(mktemp -d)

SUCCESS=0

# Run 20 concurrent queries
for i in {1..20}; do
  psql "$TRANSACTION_URL" -c 'SELECT pg_backend_pid()' > "$TMPDIR/$i.out" 2> "$TMPDIR/$i.err" &
done

wait

# Check results
for i in {1..20}; do
  # A successful query will have 'pg_backend_pid' or just 1 row of output in .out
  # And standard error will typically be empty or we can just check if psql exited with 0
  if grep -q "pg_backend_pid" "$TMPDIR/$i.out"; then
    SUCCESS=$((SUCCESS + 1))
  else
    cat "$TMPDIR/$i.err" >&2
  fi
done

rm -rf "$TMPDIR"

if [ "$SUCCESS" -eq 20 ]; then
  echo "POOL OK 20/20"
  exit 0
else
  echo "FAILED: $SUCCESS/20 succeeded"
  exit 1
fi
EOF
chmod +x pool_smoke.sh
./pool_smoke.sh
POOL OK 20/20
#4exit 0
cat << 'EOF' > pool_smoke.sh
#!/bin/bash
set -e

# Change default session port 5432 to transaction pooler port 6543
TRANSACTION_URL="${SUPABASE_DB_URL/:5432/:6543}"

TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

for i in {1..20}; do
  (
    if psql "$TRANSACTION_URL" -qtA -c 'SELECT pg_backend_pid()' > /dev/null 2> "$TMPDIR/$i.err"; then
      touch "$TMPDIR/$i.ok"
    fi
  ) &
done

wait

SUCCESS=$(ls -1 "$TMPDIR"/*.ok 2>/dev/null | wc -l)

if [ "$SUCCESS" -eq 20 ]; then
  echo "POOL OK 20/20"
  exit 0
else
  echo "FAILED: $SUCCESS/20 succeeded"
  cat "$TMPDIR"/*.err >&2 2>/dev/null || true
  exit 1
fi
EOF
chmod +x pool_smoke.sh
./pool_smoke.sh
POOL OK 20/20
#5exit 0
cat << 'EOF' > pool_smoke.sh
#!/bin/bash
set -e

# The environment provides SUPABASE_DB_URL which is session-mode (port 5432).
# Transaction-mode connection pooler is on port 6543.
TRANSACTION_URL="${SUPABASE_DB_URL/:5432/:6543}"

TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

for i in {1..20}; do
  (
    if psql "$TRANSACTION_URL" -qtA -c 'SELECT pg_backend_pid()' > /dev/null 2> "$TMPDIR/$i.err"; then
      touch "$TMPDIR/$i.ok"
    fi
  ) &
done

# wait for all background processes to finish
wait

SUCCESS=0
for i in {1..20}; do
  if [ -f "$TMPDIR/$i.ok" ]; then
    SUCCESS=$((SUCCESS + 1))
  fi
done

if [ "$SUCCESS" -eq 20 ]; then
  echo "POOL OK 20/20"
  exit 0
else
  echo "FAILED: $SUCCESS/20 succeeded"
  cat "$TMPDIR"/*.err >&2 2>/dev/null || true
  exit 1
fi
EOF
chmod +x pool_smoke.sh
./pool_smoke.sh
POOL OK 20/20

What it said at the end

I have written the `pool_smoke.sh` script to verify the behavior of the connection pooler. Here is what was done: 1. **Identified Pooler Connection:** The transaction-mode Supabase pooler operates on port `6543`, while the standard session connection (provided in `SUPABASE_DB_URL`) uses `5432`. We dynamically replace this port in the environment variable to ensure we connect properly via transaction mode, securely propagating the connection string and password without hardcoding it. 2. **Concurrent Execution:** Used a `for` loop combined with bash background execution (`&`) to run 20 concurrent `psql` instances fetching `SELECT pg_backend_pid()`. 3. **Synchronization and Output:** Used `wait` to make sure the script halts until all 20 one-shot queries are fully executed before moving forward. 4. **Assertions:** Set up an isolated temporary directory to track exit status / success indicator per query, allowing us to safely aggregate the outcome and print `POOL OK 20/20` matching your requirements exactly. I've executed `./pool_smoke.sh` locally and it succeeds and exits `0` validating the pooling setup!

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