Cass

CASS

cass is raw session search. Use it when you need evidence, not distilled guidance.

Prerequisites

command -v cass

If missing, stop and tell the user:

brew install dicklesworthstone/tap/cass

Golden Rules

1. Never run bare cass in an agent context. It opens the TUI.
2. Always use --json or --robot for machine-readable output.
3. Run a cheap health check before deep searches.
4. Treat cass as a tool boundary; do not merge its runtime assumptions into Lev core.

Fast Path

cass status --json
# When `.index.status` is "stale":
/Users/jean-patricksmith/.local/bin/cass-maintain
tail -n 1 /Users/jean-patricksmith/.local/state/cass/auto-index-telemetry.jsonl
cass status --json
cass search "authentication timeout" --robot --limit 5 --fields minimal

Core Commands

Health and readiness

cass health --json
cass status --json
cass capabilities --json
cass introspect --json

Search

cass search "query" --robot --limit 5
cass search "query" --robot --fields minimal
cass search "query" --robot --workspace /path/to/project
cass search "query" --robot --days 30

Inspect specific results

cass view /path/to/session.jsonl -n 42 --json
cass expand /path/to/session.jsonl -n 42 -C 5 --json

Documentation for agents

cass robot-docs guide
cass robot-docs commands
cass robot-docs schemas

Recommended Workflow

1. Check index freshness

cass status --json

If .index.status is stale, run the bounded incremental wrapper and wait for it to exit before searching:

/Users/jean-patricksmith/.local/bin/cass-maintain
tail -n 1 /Users/jean-patricksmith/.local/state/cass/auto-index-telemetry.jsonl
cass status --json

Treat success, idle, and overlap_skipped as handled outcomes. For hard_timeout or failed, stop and report the last telemetry row and log tail; do not widen the operation. After a handled refresh, rerun the user's original search exactly—the status check alone is not freshness proof.

Never use bare cass index, --full, --force, or --force-rebuild to make a search fresh. If the index is missing, stop and request an explicit bootstrap decision; routine search freshness is owned only by cass-maintain.

2. Search narrowly

Prefer scoped searches:

cass search "database migration" --robot --workspace /abs/path --limit 5

3. Expand only the promising hits

Use view or expand after search rather than dumping large result sets.

When To Use cass vs cm

Use cass for:

• raw session evidence
• exact historical wording
• line-level follow-up after search
• cross-agent recovery during handoffs

Use cm for:

• distilled rules
• anti-pattern recall
• pre-task memory hydration

Anti-Patterns

• Running cass without --json or --robot
• Pulling large unscoped result sets into context
• Treating search hits as validated guidance without inspection
• Using cass as the project task tracker

Minimal Extraction Pattern

## CASS Evidence
- Query:
- Hits used:
- Key lines or summaries:
- Why they matter:

Keep this evidence summary in the current Lev artifact, not in ad hoc notes.