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

deepseek/deepseek-v4-pro · d2_pooling · rep 1

pass
model
deepseek/deepseek-v4-pro
task
d2_pooling
rep
1
day
2
steps
6
tokens
22,224
est. cost
$0.013
agent time
62s
wave
s4
started
2026-07-24T06:16:02Z

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 — 6 commands

#1exit 0
echo "=== Environment variables ===" && env | grep -i supabase | sort && echo "" && echo "=== Check psql availability ===" && which psql && echo "" && echo "=== Check if pooler hostname can be derived ===" && echo "SUPABASE_DB_URL: $SUPABASE_DB_URL"
=== Environment variables ===
SUPABASE_ANON_KEY=<redacted:SUPABASE_ANON_KEY>
SUPABASE_DB_PASSWORD=<redacted:SUPABASE_DB_PASSWORD>
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
SUPABASE_PROJECT_REF=<ref>
SUPABASE_SERVICE_ROLE_KEY=<redacted:SUPABASE_SERVICE_ROLE_KEY>
SUPABASE_URL=https://<ref>.supabase.co

=== Check psql availability ===
/usr/bin/psql

=== Check if pooler hostname can be derived ===
SUPABASE_DB_URL: <redacted:SUPABASE_DB_URL>
#2exit 0
echo "=== Testing session-mode (port 5432) ===" && PGPASSWORD="$SUPABASE_DB_PASSWORD" psql "postgresql://postgres.<ref>@aws-0-us-east-1.pooler.supabase.com:5432/postgres" -c "SELECT pg_backend_pid();" 2>&1 && echo "" && echo "=== Testing transaction-mode (port 6543) ===" && PGPASSWORD="$SUPABASE_DB_PASSWORD" psql "postgresql://postgres.<ref>@aws-0-us-east-1.pooler.supabase.com:6543/postgres" -c "SELECT pg_backend_pid();" 2>&1
=== Testing session-mode (port 5432) ===
 pg_backend_pid 
----------------
          14925
(1 row)


=== Testing transaction-mode (port 6543) ===
 pg_backend_pid 
----------------
          14968
(1 row)
#3exit 0
cat > pool_smoke.sh << 'SCRIPT'
#!/usr/bin/env bash
set -euo pipefail

# --- Derive transaction-mode connection URL from env vars --------------------
# SUPABASE_DB_URL format:
#   postgresql://user:<redacted>@host.pooler.supabase.com:5432/dbname
# Transaction-mode pooler runs on port 6543 on the same host.

: "${SUPABASE_DB_URL:?Must be set}"
: "${SUPABASE_DB_PASSWORD:?Must be set}"

# Parse the session-mode URL and swap port 5432 -> 6543
# We do NOT hardcode the password; we use SUPABASE_DB_PASSWORD separately.
TX_URL="$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')"

# Quick sanity: the new URL must differ from the original
if [ "$TX_URL" = "$SUPABASE_DB_URL" ]; then
  echo "ERROR: could not rewrite port 5432 -> 6543 in SUPABASE_DB_URL" >&2
  exit 1
fi

# Export password so psql picks it up
export PGPASSWORD="$SUPABASE_DB_PASSWORD"

# --- Run 20 concurrent one-shot queries -------------------------------------
CONCURRENCY=20
tmpdir="$(mktemp -d)"
trap 'rm -rf "$tmpdir"' EXIT

successes=0
pids=()

for i in $(seq 1 "$CONCURRENCY"); do
  (
    if psql "$TX_URL" -c "SELECT pg_backend_pid();" -q -t -A >/dev/null 2>&1; then
      echo "ok" > "$tmpdir/result_$i"
    else
      echo "fail" > "$tmpdir/result_$i"
    fi
  ) &
  pids+=($!)
done

# Wait for all
for pid in "${pids[@]}"; do
  wait "$pid"
done

# Tally
successes=$(grep -c '^ok$' "$tmpdir"/result_* 2>/dev/null || echo 0)

if [ "$successes" -eq "$CONCURRENCY" ]; then
  echo "POOL OK ${successes}/${CONCURRENCY}"
  exit 0
else
  echo "POOL FAIL ${successes}/${CONCURRENCY}" >&2
  exit 1
fi
SCRIPT
chmod +x pool_smoke.sh
echo "=== Script written ==="
cat pool_smoke.sh
=== Script written ===
#!/usr/bin/env bash
set -euo pipefail

# --- Derive transaction-mode connection URL from env vars --------------------
# SUPABASE_DB_URL format:
#   postgresql://user:<redacted>@host.pooler.supabase.com:5432/dbname
# Transaction-mode pooler runs on port 6543 on the same host.

: "${SUPABASE_DB_URL:?Must be set}"
: "${SUPABASE_DB_PASSWORD:?Must be set}"

# Parse the session-mode URL and swap port 5432 -> 6543
# We do NOT hardcode the password; we use SUPABASE_DB_PASSWORD separately.
TX_URL="$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')"

# Quick sanity: the new URL must differ from the original
if [ "$TX_URL" = "$SUPABASE_DB_URL" ]; then
  echo "ERROR: could not rewrite port 5432 -> 6543 in SUPABASE_DB_URL" >&2
  exit 1
fi

# Export password so psql picks it up
export PGPASSWORD="$SUPABASE_DB_PASSWORD"

# --- Run 20 concurrent one-shot queries -------------------------------------
CONCURRENCY=20
tmpdir="$(mktemp -d)"
trap 'rm -rf "$tmpdir"' EXIT

successes=0
pids=()

for i in $(seq 1 "$CONCURRENCY"); do
  (
    if psql "$TX_URL" -c "SELECT pg_backend_pid();" -q -t -A >/dev/null 2>&1; then
      echo "ok" > "$tmpdir/result_$i"
    else
      echo "fail" > "$tmpdir/result_$i"
    fi
  ) &
  pids+=($!)
done

# Wait for all
for pid in "${pids[@]}"; do
  wait "$pid"
done

# Tally
successes=$(grep -c '^ok$' "$tmpdir"/result_* 2>/dev/null || echo 0)

if [ "$successes" -eq "$CONCURRENCY" ]; then
  echo "POOL OK ${successes}/${CONCURRENCY}"
  exit 0
else
  echo "POOL FAIL ${successes}/${CONCURRENCY}" >&2
  exit 1
fi
#4exit 1
./pool_smoke.sh
./pool_smoke.sh: line 52: [: /tmp/tmp.GCenDsiD7f/result_1:1
/tmp/tmp.GCenDsiD7f/result_10:1
/tmp/tmp.GCenDsiD7f/result_11:1
/tmp/tmp.GCenDsiD7f/result_12:1
/tmp/tmp.GCenDsiD7f/result_13:1
/tmp/tmp.GCenDsiD7f/result_14:1
/tmp/tmp.GCenDsiD7f/result_15:1
/tmp/tmp.GCenDsiD7f/result_16:1
/tmp/tmp.GCenDsiD7f/result_17:1
/tmp/tmp.GCenDsiD7f/result_18:1
/tmp/tmp.GCenDsiD7f/result_19:1
/tmp/tmp.GCenDsiD7f/result_2:1
/tmp/tmp.GCenDsiD7f/result_20:1
/tmp/tmp.GCenDsiD7f/result_3:1
/tmp/tmp.GCenDsiD7f/result_4:1
/tmp/tmp.GCenDsiD7f/result_5:1
/tmp/tmp.GCenDsiD7f/result_6:1
/tmp/tmp.GCenDsiD7f/result_7:1
/tmp/tmp.GCenDsiD7f/result_8:1
/tmp/tmp.GCenDsiD7f/result_9:1: integer expression expected
POOL FAIL /tmp/tmp.GCenDsiD7f/result_1:1
/tmp/tmp.GCenDsiD7f/result_10:1
/tmp/tmp.GCenDsiD7f/result_11:1
/tmp/tmp.GCenDsiD7f/result_12:1
/tmp/tmp.GCenDsiD7f/result_13:1
/tmp/tmp.GCenDsiD7f/result_14:1
/tmp/tmp.GCenDsiD7f/result_15:1
/tmp/tmp.GCenDsiD7f/result_16:1
/tmp/tmp.GCenDsiD7f/result_17:1
/tmp/tmp.GCenDsiD7f/result_18:1
/tmp/tmp.GCenDsiD7f/result_19:1
/tmp/tmp.GCenDsiD7f/result_2:1
/tmp/tmp.GCenDsiD7f/result_20:1
/tmp/tmp.GCenDsiD7f/result_3:1
/tmp/tmp.GCenDsiD7f/result_4:1
/tmp/tmp.GCenDsiD7f/result_5:1
/tmp/tmp.GCenDsiD7f/result_6:1
/tmp/tmp.GCenDsiD7f/result_7:1
/tmp/tmp.GCenDsiD7f/result_8:1
/tmp/tmp.GCenDsiD7f/result_9:1/20
#5exit 0
cat > pool_smoke.sh << 'SCRIPT'
#!/usr/bin/env bash
set -euo pipefail

# --- Derive transaction-mode connection URL from env vars --------------------
# SUPABASE_DB_URL format:
#   postgresql://user:<redacted>@host.pooler.supabase.com:5432/dbname
# Transaction-mode pooler runs on port 6543 on the same host.

: "${SUPABASE_DB_URL:?Must be set}"
: "${SUPABASE_DB_PASSWORD:?Must be set}"

# Rewrite port 5432 -> 6543 (session → transaction mode)
TX_URL="$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')"

if [ "$TX_URL" = "$SUPABASE_DB_URL" ]; then
  echo "ERROR: could not rewrite port 5432 -> 6543 in SUPABASE_DB_URL" >&2
  exit 1
fi

# Export password so psql picks it up (never hardcoded)
export PGPASSWORD="$SUPABASE_DB_PASSWORD"

# --- Run 20 concurrent one-shot queries -------------------------------------
CONCURRENCY=20
tmpdir="$(mktemp -d)"
trap 'rm -rf "$tmpdir"' EXIT

pids=()

for i in $(seq 1 "$CONCURRENCY"); do
  (
    if psql "$TX_URL" -c "SELECT pg_backend_pid();" -q -t -A >/dev/null 2>&1; then
      echo "ok" > "$tmpdir/result_$i"
    else
      echo "fail" > "$tmpdir/result_$i"
    fi
  ) &
  pids+=($!)
done

# Wait for all
for pid in "${pids[@]}"; do
  wait "$pid"
done

# Tally: count how many files contain exactly "ok"
successes=$(grep -lx 'ok' "$tmpdir"/result_* 2>/dev/null | wc -l)

if [ "$successes" -eq "$CONCURRENCY" ]; then
  echo "POOL OK ${successes}/${CONCURRENCY}"
  exit 0
else
  echo "POOL FAIL ${successes}/${CONCURRENCY}" >&2
  exit 1
fi
SCRIPT
chmod +x pool_smoke.sh
echo "=== Fixed script ==="
./pool_smoke.sh
=== Fixed script ===
POOL OK 20/20
#6exit 0
echo "=== Confirm TX_URL rewrites to port 6543 ===" && TX_URL="$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')" && echo "Session-mode (original): $SUPABASE_DB_URL" && echo "Transaction-mode (used):  $TX_URL" && echo "" && echo "=== Run again to confirm idempotent ===" && ./pool_smoke.sh && echo "" && echo "=== Verify password is NOT hardcoded ===" && grep -n '792118' pool_smoke.sh || echo "(no hardcoded password found — good)"
=== Confirm TX_URL rewrites to port 6543 ===
Session-mode (original): <redacted:SUPABASE_DB_URL>
Transaction-mode (used):  postgresql://postgres.<ref>:<redacted:SUPABASE_DB_PASSWORD>@aws-0-us-east-1.pooler.supabase.com:6543/postgres

=== Run again to confirm idempotent ===
POOL OK 20/20

=== Verify password is NOT hardcoded ===
(no hardcoded password found — good)

What it said at the end

Done. Here's what the script does: 1. **Reads `SUPABASE_DB_URL` and `SUPABASE_DB_PASSWORD` from the environment** — never hardcodes credentials. 2. **Rewrites the port** from `5432` (session-mode pooler) to `6543` (transaction-mode pooler) on the same Supabase pooler host. 3. **Launches 20 background `psql` processes**, each running `SELECT pg_backend_pid()` through the transaction-mode pooler and writing `ok`/`fail` to a temp file. 4. **Waits for all 20**, then tallies successes. If all 20 succeeded, it prints `POOL OK 20/20` and exits `0`; otherwise prints `POOL FAIL n/20` and exits `1`. Key evidence it's correct: - The original `SUPABASE_DB_URL` points to port **5432** (session mode); the script rewrites it to port **6543** (transaction mode). - Running it produced `POOL OK 20/20` with exit code 0. - No password appears in the script source.

3 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