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

google/gemini-3.1-pro-preview · d2_pooling · rep 2

pass
model
google/gemini-3.1-pro-preview
task
d2_pooling
rep
2
day
2
steps
6
tokens
15,427
est. cost
$0.093
agent time
68s
wave
s4
started
2026-07-24T05:01:26Z

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
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 "${SUPABASE_DB_URL/5432/6543}" -c 'SELECT 1;'
 ?column? 
----------
        1
(1 row)

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

if [ -z "$SUPABASE_DB_URL" ]; then
    echo "SUPABASE_DB_URL is not set"
    exit 1
fi

# Change from session-mode port (5432) to transaction-mode port (6543)
POOL_DB_URL="${SUPABASE_DB_URL/:5432\//:6543\/}"

SUCCESS_COUNT=0
for i in {1..20}; do
    psql "$POOL_DB_URL" -tAc "SELECT pg_backend_pid();" > /dev/null 2>&1 &
    pids[${i}]=$!
done

for pid in ${pids[*]}; do
    wait $pid
    if [ $? -eq 0 ]; then
        SUCCESS_COUNT=$((SUCCESS_COUNT + 1))
    fi
done

if [ "$SUCCESS_COUNT" -eq 20 ]; then
    echo "POOL OK 20/20"
    exit 0
else
    echo "Failed: $SUCCESS_COUNT/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

if [ -z "$SUPABASE_DB_URL" ]; then
    echo "Error: SUPABASE_DB_URL not found in environment" >&2
    exit 1
fi

# Use transaction-mode port (6543) instead of session-mode port (5432)
POOL_URL="${SUPABASE_DB_URL/5432/6543}"

SUCCESS_COUNT=0
pids=()

for i in {1..20}; do
    psql "$POOL_URL" -q -c "SELECT pg_backend_pid();" > /dev/null 2>&1 &
    pids+=($!)
done

for pid in "${pids[@]}"; do
    wait "$pid"
    if [ $? -eq 0 ]; then
        ((SUCCESS_COUNT++))
    fi
done

if [ "$SUCCESS_COUNT" -eq 20 ]; then
    echo "POOL OK 20/20"
    exit 0
else
    echo "Failed: $SUCCESS_COUNT/20 succeeded." >&2
    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 -u

if [ -z "${SUPABASE_DB_URL:-}" ]; then
    echo "SUPABASE_DB_URL is not set" >&2
    exit 1
fi

# Replace the session-mode port (5432) with the transaction-mode port (6543)
POOL_DB_URL="${SUPABASE_DB_URL/:5432\//:6543\/}"

SUCCESS=0
PIDS=()

for i in {1..20}; do
    psql "$POOL_DB_URL" -q -tAc "SELECT pg_backend_pid();" > /dev/null 2>&1 &
    PIDS+=($!)
done

for pid in "${PIDS[@]}"; do
    if wait "$pid"; then
        ((SUCCESS++))
    fi
done

if [ "$SUCCESS" -eq 20 ]; then
    echo "POOL OK 20/20"
    exit 0
else
    echo "FAILED: $SUCCESS/20 queries succeeded" >&2
    exit 1
fi
EOF
chmod +x pool_smoke.sh
./pool_smoke.sh
POOL OK 20/20
#6exit 0
./pool_smoke.sh
POOL OK 20/20

What it said at the end

I have created and tested the script `pool_smoke.sh` successfully. Here is what I did: 1. Checked the available environment variables natively present in the environment (finding `SUPABASE_DB_URL` pointing to port 5432, which is session mode). 2. Supabase uses port `6543` for transaction-mode connection pooling. I created the script to dynamically substitute port `5432` with `6543` in the `SUPABASE_DB_URL` string – ensuring no hardcoding of connection strings or database passwords. 3. The script loops and creates 20 concurrent one-shot connections leveraging bash background jobs (`&`), saving their PIDs. 4. Finally, the script `wait`s for all spawned background processes, aggregating their success rate, and if all exactly 20 completed successfully without errors, it prints exactly `"POOL OK 20/20"` and exits with code 0. 5. Executed `./pool_smoke.sh` locally and it outputted `POOL OK 20/20`, confirming the transaction mode connection limits and operations behave correctly with 20 parallel queries.

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