Imported from majiayu000/claude-skill-registry (skills/data/cass/SKILL.md). Install upstream with npx skills add majiayu000/claude-skill-registry --skill cass. Copyright stays with the author.

CASS - Coding Agent Session Search

Unified, high-performance CLI/TUI to index and search your local coding agent history. Aggregates sessions from 11 agents: Codex, Claude Code, Gemini CLI, Cline, OpenCode, Amp, Cursor, ChatGPT, Aider, Pi-Agent, and Factory (Droid).

CRITICAL: Robot Mode Required for AI Agents

NEVER run bare cass - it launches an interactive TUI that blocks your session!

# WRONG - blocks terminal
cass

# CORRECT - JSON output for agents
cass search "query" --robot
cass search "query" --json  # alias

Always use --robot or --json flags for machine-readable output.

Quick Reference for AI Agents

Pre-Flight Check

# Health check (exit 0=healthy, 1=unhealthy, <50ms)
cass health

# If unhealthy, rebuild index
cass index --full

Essential Commands

# Search with JSON output
cass search "authentication error" --robot --limit 5

# Search with metadata (elapsed_ms, cache stats, freshness)
cass search "error" --robot --robot-meta

# Minimal payload (path, line, agent only)
cass search "bug" --robot --fields minimal

# View source at specific line
cass view /path/to/session.jsonl -n 42 --json

# Expand context around a line
cass expand /path/to/session.jsonl -n 42 -C 5 --json

# Capabilities discovery
cass capabilities --json

# Full API schema
cass introspect --json

# LLM-optimized documentation
cass robot-docs guide
cass robot-docs commands
cass robot-docs schemas
cass robot-docs examples
cass robot-docs exit-codes

Why Use CASS

Cross-Agent Knowledge Transfer

Your coding agents create scattered knowledge:

• Claude Code sessions in ~/.claude/projects
• Codex sessions in ~/.codex/sessions
• Cursor state in SQLite databases
• Aider history in markdown files

CASS unifies all of this into a single searchable index. When you're stuck on a problem, search across ALL your past agent sessions to find relevant solutions.

Use Cases

# "I solved this before..."
cass search "TypeError: Cannot read property" --robot --days 30

# Cross-agent learning (what has ANY agent said about X?)
cass search "authentication" --robot --workspace /path/to/project

# Agent-to-agent handoff
cass search "database migration" --robot --fields summary

# Daily review
cass timeline --today --json

Command Reference

Indexing

# Full rebuild of DB and search index
cass index --full

# Incremental update (since last scan)
cass index

# Watch mode: auto-reindex on file changes
cass index --watch

# Force rebuild even if schema unchanged
cass index --full --force-rebuild

# Safe retries with idempotency key
cass index --full --idempotency-key "build-$(date +%Y%m%d)"

# JSON output with stats
cass index --full --json

Search

# Basic search (JSON output required for agents!)
cass search "query" --robot

# With filters
cass search "error" --robot --agent claude --days 7
cass search "bug" --robot --workspace /path/to/project
cass search "panic" --robot --today

# Time filters
cass search "auth" --robot --since 2024-01-01 --until 2024-01-31
cass search "test" --robot --yesterday
cass search "fix" --robot --week

# Wildcards
cass search "auth*" --robot          # prefix: authentication, authorize
cass search "*tion" --robot          # suffix: authentication, exception
cass search "*config*" --robot       # substring: misconfigured

# Token budget management (critical for LLMs!)
cass search "error" --robot --fields minimal              # path, line, agent only
cass search "error" --robot --fields summary              # adds title, score
cass search "error" --robot --max-content-length 500      # truncate fields
cass search "error" --robot --max-tokens 2000             # soft budget (~4 chars/token)
cass search "error" --robot --limit 5                     # cap results

# Pagination (cursor-based)
cass search "TODO" --robot --robot-meta --limit 20
# Use _meta.next_cursor from response:
cass search "TODO" --robot --robot-meta --limit 20 --cursor "eyJ..."

# Match highlighting
cass search "authentication error" --robot --highlight

# Query analysis/debugging
cass search "auth*" --robot --explain    # parsed query, cost estimates
cass search "auth error" --robot --dry-run  # validate without executing

# Aggregations
cass search "error" --robot --aggregate agent,workspace,date

# Request correlation
cass search "bug" --robot --request-id "req-12345"

# Source filtering (for multi-machine setups)
cass search "auth" --robot --source laptop
cass search "error" --robot --source remote

Session Analysis

# Export conversation to markdown/HTML/JSON
cass export /path/to/session.jsonl --format markdown -o conversation.md
cass export /path/to/session.jsonl --format html -o conversation.html
cass export /path/to/session.jsonl --format json --include-tools

# Expand context around a line (from search result)
cass expand /path/to/session.jsonl -n 42 -C 5 --json
# Shows 5 messages before and after line 42

# View source at line
cass view /path/to/session.jsonl -n 42 --json

# Activity timeline
cass timeline --today --json --group-by hour
cass timeline --days 7 --json --agent claude
cass timeline --since 7d --json

# Find related sessions for a file
cass context /path/to/source.ts --json

Status & Diagnostics

# Quick health (<50ms)
cass health
cass health --json

# Full status snapshot
cass status --json
cass state --json  # alias

# Statistics
cass stats --json
cass stats --by-source  # for multi-machine

# Full diagnostics
cass diag --verbose

Remote Sources (Multi-Machine Search)

Search across sessions from multiple machines via SSH/rsync:

# Add a remote machine
cass sources add user@laptop.local --preset macos-defaults
cass sources add dev@workstation --path ~/.claude/projects --path ~/.codex/sessions

# List sources
cass sources list --json

# Sync sessions
cass sources sync
cass sources sync --source laptop --verbose

# Check connectivity
cass sources doctor
cass sources doctor --source laptop --json

# Path mappings (rewrite remote paths to local)
cass sources mappings list laptop
cass sources mappings add laptop --from /home/user/projects --to /Users/me/projects
cass sources mappings test laptop /home/user/projects/myapp/src/main.rs

# Remove source
cass sources remove laptop --purge -y

Configuration stored in ~/.config/cass/sources.toml (Linux) or ~/Library/Application Support/cass/sources.toml (macOS).

Shell Completions

cass completions bash > ~/.local/share/bash-completion/completions/cass
cass completions zsh > "${fpath[1]}/_cass"
cass completions fish > ~/.config/fish/completions/cass.fish
cass completions powershell >> $PROFILE

Robot Mode Deep Dive

Self-Documenting API

CASS teaches agents how to use itself:

# Quick capability check
cass capabilities --json
# Returns: features, connectors, limits

# Full API schema
cass introspect --json
# Returns: all commands, arguments, response shapes

# Topic-based docs (LLM-optimized)
cass robot-docs commands   # all commands and flags
cass robot-docs schemas    # response JSON schemas
cass robot-docs examples   # copy-paste invocations
cass robot-docs exit-codes # error handling
cass robot-docs guide      # quick-start walkthrough

Forgiving Syntax (Agent-Friendly)

CASS auto-corrects common mistakes:

Command Aliases:

• find, query, q, lookup, grep -> search
• ls, list, info, summary -> stats
• st, state -> status
• reindex, idx, rebuild -> index
• show, get, read -> view
• docs, help-robot, robotdocs -> robot-docs

Output Formats

# Pretty-printed JSON (default)
cass search "error" --robot

# Streaming JSONL (header + one hit per line)
cass search "error" --robot-format jsonl

# Compact single-line JSON
cass search "error" --robot-format compact

# With performance metadata
cass search "error" --robot --robot-meta

Design principle: stdout = JSON only; diagnostics go to stderr.

Token Budget Management

LLMs have context limits. Control output size:

Truncated fields include *_truncated: true indicator.

Structured Error Handling

Errors are JSON with actionable hints:

{
  "error": {
    "code": 3,
    "kind": "index_missing",
    "message": "Search index not found",
    "hint": "Run 'cass index --full' to build the index",
    "retryable": false
  }
}

Exit Codes

Response Shapes

Search Response:

{
  "query": "error",
  "limit": 10,
  "offset": 0,
  "count": 5,
  "total_matches": 42,
  "hits": [
    {
      "source_path": "/path/to/session.jsonl",
      "line_number": 123,
      "agent": "claude_code",
      "workspace": "/projects/myapp",
      "title": "Authentication debugging",
      "snippet": "The error occurs when...",
      "score": 0.85,
      "match_type": "exact",
      "created_at": "2024-01-15T10:30:00Z"
    }
  ],
  "_meta": {
    "elapsed_ms": 12,
    "cache_hit": true,
    "wildcard_fallback": false,
    "next_cursor": "eyJ...",
    "index_freshness": { "stale": false, "age_seconds": 120 }
  }
}

Status Response:

{
  "healthy": true,
  "recommended_action": null,
  "index": { "exists": true, "fresh": true, "age_seconds": 120 },
  "database": { "conversations": 500, "messages": 10000 },
  "pending": { "sessions": 0, "watch_active": true }
}

Query Language

Basic Queries

Wildcard Patterns

Match Types

Results include match_type:

Auto-Fuzzy Fallback

When exact query returns <3 results, CASS automatically retries with wildcards:

• auth -> *auth*
• Results flagged with wildcard_fallback: true

Supported Agents (11 Connectors)

Note: ChatGPT v2/v3 are AES-256-GCM encrypted (keychain access required). Legacy v1 unencrypted conversations are indexed automatically.

TUI Features (for Humans)

Launch with cass (no flags):

Keyboard Shortcuts

Navigation:

• Up/Down: Move selection
• Left/Right: Switch panes
• Tab/Shift+Tab: Cycle focus
• Enter: Open in $EDITOR
• Space: Full-screen detail view

Filtering:

• F3: Agent filter
• F4: Workspace filter
• F5/F6: Time filters
• Shift+F5: Cycle presets (24h/7d/30d/all)
• Ctrl+Del: Clear all filters

Modes:

• F2: Toggle dark/light theme
• F7: Context window size (S/M/L/XL)
• F9: Match mode (prefix/standard)
• F12: Ranking mode (recent/balanced/relevance/quality/newest/oldest)
• Ctrl+B: Toggle border style

Actions:

• m: Toggle selection
• Ctrl+A: Select all
• Ctrl+Enter: Add to queue
• Ctrl+O: Open all queued
• y: Copy path/content
• /: Find in detail pane
• n/N: Next/prev match
• Ctrl+P: Command palette
• 1-9: Load saved view
• Shift+1-9: Save view to slot

Source Filtering (multi-machine):

• F11: Cycle source filter (all/local/remote)
• Shift+F11: Source selection menu

Ranking Modes

Cycle with F12 in TUI or use --ranking flag:

Optional Semantic Search

Local-only semantic search using MiniLM (no cloud):

Required files (place in data directory):

• model.onnx
• tokenizer.json
• config.json
• special_tokens_map.json
• tokenizer_config.json

Vector index stored as vector_index/index-minilm-384.cvvi.

CASS does NOT auto-download models; you must manually install them.

Bookmarks

Save important results for later:

# Bookmarks stored in SQLite: ~/.local/share/coding-agent-search/bookmarks.db

In TUI: Press b to bookmark, add notes and tags.

Bookmark structure:

• title: Short description
• source_path, line_number, agent, workspace
• note: Your annotations
• tags: Comma-separated labels
• snippet: Extracted content

Watch Mode

Real-time index updates:

cass index --watch

• Debounce: 2 seconds (wait for burst to settle)
• Max wait: 5 seconds (force flush during continuous activity)
• Incremental: Only re-scans modified files

TUI automatically starts watch mode in background.

Performance Characteristics

Memory: 70-140MB typical (50K messages) Disk: ~600 bytes/message (including n-gram overhead)

Environment Variables

Integration with CASS Memory (cm)

CASS provides episodic memory (raw sessions). CM extracts procedural memory (rules and playbooks):

# 1. CASS indexes raw sessions
cass index --full

# 2. Search for relevant past experience
cass search "authentication timeout" --robot --limit 10

# 3. CM reflects on sessions to extract rules
cm reflect

Troubleshooting

Ready-to-Paste AGENTS.md Blurb

## cass - Coding Agent Session Search

Search all your agent histories (Claude, Codex, Cursor, Gemini, Aider, etc.) from a unified index.

**NEVER run bare `cass`** - it launches an interactive TUI. Always use `--robot` or `--json`.

### Quick Start
cass health                                    # Pre-flight check
cass search "auth error" --robot --limit 5     # Search
cass view /path/session.jsonl -n 42 --json     # View result
cass expand /path/session.jsonl -n 42 -C 3 --json  # Context

### Key Flags
| Flag | Purpose |
|------|---------|
| --robot / --json | Machine-readable output (required!) |
| --fields minimal | Reduce payload size |
| --limit N | Cap results |
| --agent NAME | Filter by agent |
| --days N | Recent N days |

stdout = JSON only, stderr = diagnostics. Exit 0 = success.

Installation

# One-liner install
curl -fsSL https://raw.githubusercontent.com/Dicklesworthstone/coding_agent_session_search/main/install.sh \
  | bash -s -- --easy-mode --verify

# Windows
irm https://raw.githubusercontent.com/Dicklesworthstone/coding_agent_session_search/main/install.ps1 | iex