Agent WAL (Write-Ahead Log)

Write important state to disk before responding. Prevents the #1 agent failure mode: losing corrections and context during compaction.

Core Rule

Write before you respond. If something is worth remembering, WAL it first.

When to WAL

| Trigger | Action Type | Example |

|---------|------------|---------|

| User corrects you | correction | "No, use Podman not Docker" |

| You make a key decision | decision | "Using CogVideoX-2B for text-to-video" |

| Important analysis/conclusion | analysis | "WAL/VFM patterns should be core infra not skills" |

| State change | state_change | "GPU server SSH key auth configured" |

| User says "remember this" | correction | Whatever they said |

Commands

All commands via scripts/wal.py (relative to this skill directory):

# Write before responding
python3 scripts/wal.py append agent1 correction "Use Podman not Docker for all EvoClaw tooling"
python3 scripts/wal.py append agent1 decision "CogVideoX-5B with multi-GPU via accelerate"
python3 scripts/wal.py append agent1 analysis "Signed constraints prevent genome tampering"

# Working buffer (batch writes during conversation, flush before compaction)
python3 scripts/wal.py buffer-add agent1 decision "Some decision"
python3 scripts/wal.py flush-buffer agent1

# Session start: replay lost context
python3 scripts/wal.py replay agent1

# After applying a replayed entry
python3 scripts/wal.py mark-applied agent1 <entry_id>

# Maintenance
python3 scripts/wal.py status agent1
python3 scripts/wal.py prune agent1 --keep 50

Integration Points

On Session Start

1. Run replay to get unapplied entries
2. Read the summary into your context
3. Mark entries as applied after incorporating them

On User Correction

1. Run append with action_type correction BEFORE responding
2. Then respond with the corrected behavior

On Pre-Compaction Flush

1. Run flush-buffer to persist any buffered entries
2. Then write to daily memory files as usual

During Conversation

For less critical items, use buffer-add to batch writes. Buffer is flushed to WAL on flush-buffer (called during pre-compaction) or manually.

Storage

WAL files: ~/clawd/memory/wal/<agent_id>.wal.jsonl

Buffer files: ~/clawd/memory/wal/<agent_id>.buffer.jsonl

Entries are append-only JSONL. Each entry:

{"id": "abc123", "timestamp": "ISO8601", "agent_id": "agent1", "action_type": "correction", "payload": "Use Podman not Docker", "applied": false}