cass
Original:🇺🇸 English
Translated
Coding Agent Session Search - unified CLI/TUI to index and search local coding agent history from Claude Code, Codex, Gemini, Cursor, Aider, ChatGPT, Pi-Agent, Factory, and more. Purpose-built for AI agent consumption with robot mode.
36installs
NPX Install
npx skill4agent add dicklesworthstone/agent_flywheel_clawdbot_skills_and_integrations cassTags
Translated version includes tags in frontmatterSKILL.md Content
View Translation Comparison →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 - it launches an interactive TUI that blocks your session!
cassbash
# WRONG - blocks terminal
cass
# CORRECT - JSON output for agents
cass search "query" --robot
cass search "query" --json # aliasAlways use or flags for machine-readable output.
--robot--jsonQuick Reference for AI Agents
Pre-Flight Check
bash
# Health check (exit 0=healthy, 1=unhealthy, <50ms)
cass health
# If unhealthy, rebuild index
cass index --fullEssential Commands
bash
# 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-codesWhy 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
bash
# "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 --jsonCommand Reference
Indexing
bash
# 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 (24h TTL)
cass index --full --idempotency-key "build-$(date +%Y%m%d)"
# JSON output with stats
cass index --full --jsonSearch
bash
# 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 (server-side counts)
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
# Traceability (for debugging agent pipelines)
cass search "error" --robot --trace-file /tmp/cass-trace.jsonSession Analysis
bash
# 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 --jsonStatus & Diagnostics
bash
# 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 --verboseAggregation & Analytics
Aggregate search results server-side to get counts and distributions without transferring full result data:
bash
# Count results by agent
cass search "error" --robot --aggregate agent
# → { "aggregations": { "agent": { "buckets": [{"key": "claude_code", "count": 45}, ...] } } }
# Multi-field aggregation
cass search "bug" --robot --aggregate agent,workspace,date
# Combine with filters
cass search "TODO" --agent claude --robot --aggregate workspace| Aggregation Field | Description |
|---|---|
| Group by agent type (claude_code, codex, cursor, etc.) |
| Group by workspace/project path |
| Group by date (YYYY-MM-DD) |
| Group by match quality (exact, prefix, fuzzy) |
Top 10 buckets returned per field, with for remaining items.
other_countRemote Sources (Multi-Machine Search)
Search across sessions from multiple machines via SSH/rsync.
Setup Wizard (Recommended)
bash
cass sources setupThe wizard:
- Discovers SSH hosts from
~/.ssh/config - Probes each for agent data and cass installation
- Optionally installs cass on remotes
- Indexes sessions on remotes
- Configures
sources.toml - Syncs data locally
bash
cass sources setup --hosts css,csd,yto # Specific hosts only
cass sources setup --dry-run # Preview without changes
cass sources setup --resume # Resume interrupted setupManual Setup
bash
# 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 -yConfiguration stored in (Linux) or (macOS).
~/.config/cass/sources.toml~/Library/Application Support/cass/sources.tomlRobot Mode Deep Dive
Self-Documenting API
CASS teaches agents how to use itself:
bash
# 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
cass robot-docs contracts # API versioning
cass robot-docs sources # remote sources guideForgiving Syntax (Agent-Friendly)
CASS auto-corrects common mistakes:
| What you type | What CASS understands |
|---|---|
| |
| |
| |
| |
| |
Command Aliases:
- ,
find,query,q,lookup→grepsearch - ,
ls,list,info→summarystats - ,
st→statestatus - ,
reindex,idx→rebuildindex - ,
show,get→readview - ,
docs,help-robot→robotdocsrobot-docs
Output Formats
bash
# 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-metaDesign principle: stdout = JSON only; diagnostics go to stderr.
Token Budget Management
LLMs have context limits. Control output size:
| Flag | Effect |
|---|---|
| Only |
| Adds |
| Custom field selection |
| Truncate long fields (UTF-8 safe) |
| Soft budget (~4 chars/token) |
| Cap number of results |
Truncated fields include indicator.
*_truncated: trueStructured Error Handling
Errors are JSON with actionable hints:
json
{
"error": {
"code": 3,
"kind": "index_missing",
"message": "Search index not found",
"hint": "Run 'cass index --full' to build the index",
"retryable": false
}
}Exit Codes
| Code | Meaning | Action |
|---|---|---|
| 0 | Success | Parse stdout |
| 1 | Health check failed | Run |
| 2 | Usage error | Fix syntax (hint provided) |
| 3 | Index/DB missing | Run |
| 4 | Network error | Check connectivity |
| 5 | Data corruption | Run |
| 6 | Incompatible version | Update cass |
| 7 | Lock/busy | Retry later |
| 8 | Partial result | Increase |
| 9 | Unknown error | Check |
Search Modes
Three search modes, selectable with flag:
--mode| Mode | Algorithm | Best For |
|---|---|---|
| lexical (default) | BM25 full-text | Exact term matching, code searches |
| semantic | Vector similarity | Conceptual queries, "find similar" |
| hybrid | Reciprocal Rank Fusion | Balanced precision and recall |
bash
cass search "authentication" --mode lexical --robot
cass search "how to handle user login" --mode semantic --robot
cass search "auth error handling" --mode hybrid --robotHybrid combines lexical and semantic using RRF:
RRF_score = Σ 1 / (60 + rank_i)Pipeline Mode (Chained Search)
Chain searches by piping session paths:
bash
# Find sessions mentioning "auth", then search within those for "token"
cass search "authentication" --robot-format sessions | \
cass search "refresh token" --sessions-from - --robot
# Build a filtered corpus from today's work
cass search --today --robot-format sessions > today_sessions.txt
cass search "bug fix" --sessions-from today_sessions.txt --robotUse cases:
- Drill-down: Broad search → narrow within results
- Cross-reference: Find sessions with term A, then find term B within them
- Corpus building: Save session lists for repeated searches
Query Language
Basic Queries
| Query | Matches |
|---|---|
| Messages containing "error" (case-insensitive) |
| Both "python" AND "error" |
| Exact phrase |
Boolean Operators
| Operator | Example | Meaning |
|---|---|---|
| | Both terms required (default) |
| | Either term matches |
| | First term, excluding second |
| | Shorthand for NOT |
bash
# Complex boolean query
cass search "authentication AND (error OR failure) NOT test" --robot
# Exclude test files
cass search "bug fix -test -spec" --robot
# Either error type
cass search "TypeError OR ValueError" --robotWildcard Patterns
| Pattern | Type | Performance |
|---|---|---|
| Prefix | Fast (edge n-grams) |
| Suffix | Slower (regex) |
| Substring | Slowest (regex) |
Match Types
Results include :
match_type| Type | Meaning | Score Boost |
|---|---|---|
| Verbatim match | Highest |
| Via prefix expansion | High |
| Via suffix pattern | Medium |
| Via substring pattern | Lower |
| Auto-fallback (sparse results) | Lowest |
Auto-Fuzzy Fallback
When exact query returns <3 results, CASS automatically retries with wildcards:
- →
auth*auth* - Results flagged with
wildcard_fallback: true
Flexible Time Input
CASS accepts a wide variety of time/date formats:
| Format | Examples |
|---|---|
| Relative | |
| Keywords | |
| ISO 8601 | |
| US Dates | |
| Unix Timestamp | |
Ranking Modes
Cycle with in TUI or use flag:
F12--ranking| Mode | Formula | Best For |
|---|---|---|
| Recent Heavy | | "What was I working on?" |
| Balanced | | General search |
| Relevance | | "Best explanation of X" |
| Match Quality | Penalizes fuzzy matches | Precise technical searches |
| Date Newest | Pure chronological | Recent activity |
| Date Oldest | Reverse chronological | "When did I first..." |
Score Components
- Text Relevance (BM25): Term frequency, inverse document frequency, length normalization
- Recency: Exponential decay (today ~1.0, last week ~0.7, last month ~0.3)
- Match Exactness: Exact phrase=1.0, Prefix=0.9, Suffix=0.8, Substring=0.6, Fuzzy=0.4
Blended Scoring Formula
Final_Score = BM25_Score × Match_Quality + α × Recency_Factor| Mode | α Value | Effect |
|---|---|---|
| Recent Heavy | 1.0 | Recency dominates |
| Balanced | 0.4 | Moderate recency boost |
| Relevance Heavy | 0.1 | BM25 dominates |
| Match Quality | 0.0 | Pure text matching |
Supported Agents (11 Connectors)
| Agent | Location | Format |
|---|---|---|
| Claude Code | | JSONL |
| Codex | | JSONL (Rollout) |
| Gemini CLI | | JSON |
| Cline | VS Code global storage | Task directories |
| OpenCode | | SQLite |
| Amp | | Mixed |
| Cursor | | SQLite (state.vscdb) |
| ChatGPT | | JSON (v1 unencrypted) |
| Aider | | Markdown |
| Pi-Agent | | JSONL with thinking |
| Factory (Droid) | | JSONL by workspace |
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 (no flags):
cassKeyboard Shortcuts
Navigation:
- : Move selection
Up/Down - : Switch panes
Left/Right - : Cycle focus
Tab/Shift+Tab - : Open in
Enter$EDITOR - : Full-screen detail view
Space - : Jump to first/last result
Home/End - : Scroll by page
PageUp/PageDown
Filtering:
- : Agent filter
F3 - : Workspace filter
F4 - : Time filters (from/to)
F5/F6 - : Scope to current result's agent
Shift+F3 - : Clear workspace filter
Shift+F4 - : Cycle presets (24h/7d/30d/all)
Shift+F5 - : Clear all filters
Ctrl+Del
Modes:
- : Toggle theme (6 presets)
F2 - : Context window size (S/M/L/XL)
F7 - : Match mode (prefix/standard)
F9 - : Ranking mode
F12 - : Toggle border style
Ctrl+B
Selection & Actions:
- : Toggle selection
m - : Select all
Ctrl+A - : Bulk actions menu
A - : Add to queue
Ctrl+Enter - : Open all queued
Ctrl+O - : Copy path/content
y - : Copy all selected
Ctrl+Y - : Find in detail pane
/ - : Next/prev match
n/N
Views & Palette:
- : Command palette
Ctrl+P - : Load saved view
1-9 - : Save view to slot
Shift+1-9
Source Filtering (multi-machine):
- : Cycle source filter (all/local/remote)
F11 - : Source selection menu
Shift+F11
Global:
- : Quit
Ctrl+C - or
F1: Toggle help? - : Force re-index
Ctrl+Shift+R - : Reset all TUI state
Ctrl+Shift+Del
Detail Pane Tabs
| Tab | Content | Switch With |
|---|---|---|
| Messages | Full conversation with markdown | |
| Snippets | Keyword-extracted summaries | |
| Raw | Unformatted JSON/text | |
Context Window Sizing
| Size | Characters | Use Case |
|---|---|---|
| Small | ~200 | Quick scanning |
| Medium | ~400 | Default balanced view |
| Large | ~800 | Longer passages |
| XLarge | ~1600 | Full context, code review |
Peek Mode (): Temporarily expand to XL without changing default.
Ctrl+SpaceTheme Presets
Cycle through 6 built-in themes with :
F2| Theme | Description | Best For |
|---|---|---|
| Dark | Tokyo Night-inspired deep blues | Low-light environments |
| Light | High-contrast light background | Bright environments |
| Catppuccin | Warm pastels, reduced eye strain | All-day coding |
| Dracula | Purple-accented dark theme | Popular developer theme |
| Nord | Arctic-inspired cool tones | Calm, focused work |
| High Contrast | Maximum readability | Accessibility needs |
All themes validated against WCAG contrast requirements (4.5:1 minimum for text).
Role-Aware Message Styling
| Role | Visual Treatment |
|---|---|
| User | Blue-tinted background, bold |
| Assistant | Green-tinted background |
| System | Gray/muted background |
| Tool | Orange-tinted background |
Saved Views
Save filter configurations to 9 slots for instant recall.
What Gets Saved:
- Active filters (agent, workspace, time range)
- Current ranking mode
- The search query
Keyboard:
- through
Shift+1: Save current viewShift+9 - through
1: Load view from slot9
Via Command Palette: → "Save/Load view"
Ctrl+PViews persist in across sessions.
tui_state.jsonDensity Modes
Control lines per search result. Cycle with :
Shift+D| Mode | Lines | Best For |
|---|---|---|
| Compact | 3 | Maximum results visible |
| Cozy | 5 | Balanced view (default) |
| Spacious | 8 | Detailed preview |
Bookmark System
Save important results with notes and tags:
In TUI: Press to bookmark, add notes and tags.
bBookmark Structure:
- : Short description
title - ,
source_path,line_number,agentworkspace - : Your annotations
note - : Comma-separated labels
tags - : Extracted content
snippet
Storage: (SQLite)
~/.local/share/coding-agent-search/bookmarks.dbOptional Semantic Search
Local-only semantic search using MiniLM (no cloud):
Required files (place in data directory):
model.onnxtokenizer.jsonconfig.jsonspecial_tokens_map.jsontokenizer_config.json
Vector index stored as .
vector_index/index-minilm-384.cvviCASS does NOT auto-download models; you must manually install them.
Hash Embedder Fallback: When MiniLM not installed, CASS uses a hash-based embedder for approximate semantic similarity.
Watch Mode
Real-time index updates:
bash
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.
Deduplication Strategy
CASS uses multi-layer deduplication:
- Message Hash: SHA-256 of - identical messages stored once
(role + content + timestamp) - Conversation Fingerprint: Hash of first N message hashes - detects duplicate files
- Search-Time Dedup: Results deduplicated by content similarity
Noise Filtering:
- Empty messages and pure whitespace
- System prompts (unless searching for them)
- Repeated tool acknowledgments
Performance Characteristics
| Operation | Latency |
|---|---|
| Prefix search (cached) | 2-8ms |
| Prefix search (cold) | 40-60ms |
| Substring search | 80-200ms |
| Full reindex | 5-30s |
| Incremental reindex | 50-500ms |
| Health check | <50ms |
Memory: 70-140MB typical (50K messages)
Disk: ~600 bytes/message (including n-gram overhead)
Response Shapes
Search Response:
json
{
"query": "error",
"limit": 10,
"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 }
}
}Aggregation Response:
json
{
"aggregations": {
"agent": {
"buckets": [
{"key": "claude_code", "count": 120},
{"key": "codex", "count": 85}
],
"other_count": 15
}
}
}Environment Variables
| Variable | Purpose |
|---|---|
| Override data directory |
| Base64 key for encrypted ChatGPT |
| Override Pi-Agent sessions path |
| Per-shard cache entries (default 256) |
| Total cached hits (default 2048) |
| Enable cache debug logging |
| Skip update checks |
Shell Completions
bash
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 >> $PROFILEAPI Contract & Versioning
bash
cass api-version --json
# → { "version": "0.4.0", "contract_version": "1", "breaking_changes": [] }
cass introspect --json
# → Full schema: all commands, arguments, response typesGuaranteed Stable:
- Exit codes and their meanings
- JSON response structure for output
--robot - Flag names and behaviors
- block format
_meta
Integration with CASS Memory (cm)
CASS provides episodic memory (raw sessions). CM extracts procedural memory (rules and playbooks):
bash
# 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 reflectTroubleshooting
| Issue | Solution |
|---|---|
| "missing index" | |
| Stale warning | Rerun index or enable watch |
| Empty results | Check |
| JSON parsing errors | Use |
| Watch not triggering | Check |
| Reset TUI state | |
Installation
bash
# 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 | iexIntegration with Flywheel
| Tool | Integration |
|---|---|
| CM | CASS provides episodic memory, CM extracts procedural memory |
| NTM | Robot mode flags for searching past sessions |
| Agent Mail | Search threads across agent history |
| BV | Cross-reference beads with past solutions |