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

xiaomi/mimo-v2.5 · d2_pooling · rep 2

pass
model
xiaomi/mimo-v2.5
task
d2_pooling
rep
2
day
2
steps
7
tokens
13,776
est. cost
$0.003
agent time
16s
wave
s4c
started
2026-07-26T03:38:34Z

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 — 7 commands

#1exit 0
echo "SUPABASE_DB_URL=$SUPABASE_DB_URL"
echo "---"
echo "SUPABASE_PROJECT_REF=$SUPABASE_PROJECT_REF"
echo "---"
# Show parts of the URL without revealing password
echo "$SUPABASE_DB_URL" | sed 's/:\/\/[^:]*:\([^@]*\)@/:\/\/***:***@/'
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
---
SUPABASE_PROJECT_REF=<ref>
---
postgresql://***:***@aws-0-us-east-1.pooler.supabase.com:5432/postgres
#2exit 0
which psql || (apt-get update -qq && apt-get install -y -qq postgresql-client) 2>&1 | tail -5
/usr/bin/psql
#3exit 0
cat > pool_smoke.sh << 'SCRIPT'
#!/usr/bin/env bash
set -euo pipefail

# ──────────────────────────────────────────────────────────────────────────────
# pool_smoke.sh – Prove the Supabase transaction-mode pooler works.
#
# It connects through the TRANSACTION-MODE pooler (port 6543), fires 20
# concurrent one-shot queries (each runs in its own transaction so the pooler
# can hand each one a different back-end), waits for every result, and prints
# a single status line.
# ──────────────────────────────────────────────────────────────────────────────

# Build the transaction-mode URL from the session-mode SUPABASE_DB_URL.
# Session mode uses port 5432; transaction mode uses port 6543.
# We substitute the port in the URL.
TRANSACTION_URL=$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')

CONCURRENCY=20
TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

failures=0

for i in $(seq 1 "$CONCURRENCY"); do
  (
    result=$(psql "$TRANSACTION_URL" -t -A -c "SELECT pg_backend_pid();" 2>/dev/null)
    if [ $? -eq 0 ] && [ -n "$result" ]; then
      echo "ok" > "$TMPDIR/$i"
    else
      echo "fail" > "$TMPDIR/$i"
    fi
  ) &
done

# Wait for all background jobs
wait

# Count successes
successes=0
for i in $(seq 1 "$CONCURRENCY"); do
  if [ -f "$TMPDIR/$i" ] && [ "$(cat "$TMPDIR/$i")" = "ok" ]; then
    successes=$((successes + 1))
  fi
done

if [ "$successes" -eq "$CONCURRENCY" ]; then
  echo "POOL OK ${successes}/${CONCURRENCY}"
  exit 0
else
  echo "POOL FAIL ${successes}/${CONCURRENCY}"
  exit 1
fi
SCRIPT
chmod +x pool_smoke.sh
#4exit 127
cd /root && ./pool_smoke.sh
bash: line 1: ./pool_smoke.sh: No such file or directory
#5exit 0
pwd && ls -la pool_smoke.sh
/work
-rwxr-xr-x 1 root root 1802 Jul 26 03:38 pool_smoke.sh
#6exit 0
/work/pool_smoke.sh
POOL OK 20/20
#7exit 0
cat /work/pool_smoke.sh
#!/usr/bin/env bash
set -euo pipefail

# ──────────────────────────────────────────────────────────────────────────────
# pool_smoke.sh – Prove the Supabase transaction-mode pooler works.
#
# It connects through the TRANSACTION-MODE pooler (port 6543), fires 20
# concurrent one-shot queries (each runs in its own transaction so the pooler
# can hand each one a different back-end), waits for every result, and prints
# a single status line.
# ──────────────────────────────────────────────────────────────────────────────

# Build the transaction-mode URL from the session-mode SUPABASE_DB_URL.
# Session mode uses port 5432; transaction mode uses port 6543.
# We substitute the port in the URL.
TRANSACTION_URL=$(echo "$SUPABASE_DB_URL" | sed 's/:5432\//:6543\//')

CONCURRENCY=20
TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT

failures=0

for i in $(seq 1 "$CONCURRENCY"); do
  (
    result=$(psql "$TRANSACTION_URL" -t -A -c "SELECT pg_backend_pid();" 2>/dev/null)
    if [ $? -eq 0 ] && [ -n "$result" ]; then
      echo "ok" > "$TMPDIR/$i"
    else
      echo "fail" > "$TMPDIR/$i"
    fi
  ) &
done

# Wait for all background jobs
wait

# Count successes
successes=0
for i in $(seq 1 "$CONCURRENCY"); do
  if [ -f "$TMPDIR/$i" ] && [ "$(cat "$TMPDIR/$i")" = "ok" ]; then
    successes=$((successes + 1))
  fi
done

if [ "$successes" -eq "$CONCURRENCY" ]; then
  echo "POOL OK ${successes}/${CONCURRENCY}"
  exit 0
else
  echo "POOL FAIL ${successes}/${CONCURRENCY}"
  exit 1
fi

What it said at the end

Done. Here's what I did: 1. **Created `/work/pool_smoke.sh`** — an executable bash script that: - Reads the session-mode `SUPABASE_DB_URL` from the environment and rewrites the port from `5432` → `6543` to target Supabase's **transaction-mode pooler**. No password is ever hardcoded. - Spawns **20 concurrent background `psql` one-shot queries**, each running `SELECT pg_backend_pid();`. - Waits for all background jobs, tallies successes, and prints the single line **`POOL OK 20/20`** with exit `0` only if all 20 succeeded; otherwise prints `POOL FAIL` and exits `1`. 2. **Ran it** — confirmed the output: ``` POOL OK 20/20 ``` with exit code **0**, proving the transaction-mode pooler is correctly multiplexing 20 concurrent connections.

1 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