agent_data_duckdb: Instructions file for GitHub Copilot

agent_data DuckDB Extension - Development Instructions

Critical Caveats

1. JSONL File Handling - DANGER ZONE

⚠️ NEVER print, cat, or view full JSONL files from claude_raw/, copilot_raw/ or test/data/

The JSONL conversation files can be massive (hundreds of MB). Incorrect commands will:

• Pollute the entire context window
• Cause memory issues
• Result in incomplete/corrupted output

Safe Commands:

# View first N bytes only
head -c 500 file.jsonl

# Count lines without reading content
wc -l file.jsonl

# Get first N complete JSON lines
head -n 3 file.jsonl | jq -c '.'

# Sample specific fields only
head -n 10 file.jsonl | jq -c '{type, timestamp}'

# Get file size
ls -lh file.jsonl

NEVER DO:

cat file.jsonl           # DANGEROUS
less file.jsonl          # DANGEROUS (without limits)
jq '.' file.jsonl        # DANGEROUS (reads entire file)

2. Build and Test

make configure   # First time setup
make debug       # Build debug extension
make test        # Build + run all tests

3. Testing Strategy

• Always run tests with limited data first
• Use test/data/ (Claude) and test/data_copilot/ (Copilot) synthetic data
• Never use claude_raw/ or copilot_raw/ for automated tests
• Run make test after every change
• Tests are assertion-driven (PASS/FAIL output)

Project Structure

agentic-copilot/
├── .copilot-instructions.md  # THIS FILE
├── Cargo.toml                # Rust crate (agent_data)
├── Makefile                  # Build system
├── src/                      # Rust extension source
│   ├── lib.rs               # Entry point (registers 5 functions)
│   ├── vtab.rs              # Generic VTab framework (TableFunc trait)
│   ├── detect.rs            # Provider auto-detection (Claude/Copilot)
│   ├── types/
│   │   ├── mod.rs           # Re-exports
│   │   ├── claude.rs        # Claude JSON/JSONL serde types
│   │   └── copilot.rs       # Copilot event serde types
│   ├── utils.rs             # Path resolution, file discovery (both providers)
│   ├── conversations.rs     # Unified read_conversations()
│   ├── plans.rs             # Unified read_plans()
│   ├── todos.rs             # Unified read_todos()
│   ├── history.rs           # Unified read_history()
│   └── stats.rs             # read_stats() (Claude only)
├── test/
│   ├── data/                # Synthetic Claude data (~/.claude mock)
│   ├── data_copilot/        # Synthetic Copilot data (~/.copilot mock)
│   └── sql/                 # SQL test files (104+ assertions)
├── scripts/
│   ├── test.sh              # SQL test runner
│   └── smoke_test.sh        # Python/DuckDB smoke test
├── examples/
│   └── explore.py           # Marimo notebook (multi-source)
├── docs/                    # Documentation
│   ├── CLAUDE_FILE_STRUCTURE.md
│   ├── CLAUDE_FILE_SCHEMAS.md
│   ├── COPILOT_FILE_STRUCTURE.md
│   ├── COPILOT_FILE_SCHEMAS.md
│   └── DUCKDB_EXTENSION_PATTERNS.md
├── claude_raw/              # Real Claude data - READ ONLY, HANDLE WITH CARE
└── copilot_raw/             # Real Copilot data - READ ONLY, HANDLE WITH CARE