cli

README

Rekal

Beta — Works with Claude Code. Expect breaking changes.

Rekal gives your AI agent precise memory — the exact context it needs for what it is working on, across your entire team. It hooks into git, captures session context at every commit, and makes it a permanent, queryable part of your project's history.

Your agent starts every session knowing why the code looks the way it does.

Table of Contents

• What Makes Rekal Different
• How It Works
• Quick Start
• Commands Reference
• Typical Workflow
• Architecture
• Benchmarks
• Development
• Getting Help
• License

What Makes Rekal Different

• Security first — Everything stays local. Nothing leaves the boundaries of git. No external services, no cloud APIs, no telemetry. A single binary with zero runtime dependencies beyond git itself.
• Immutable by design — Session snapshots are append-only. Content-hash deduplication means two developers always write to disjoint rows — merge conflicts are structurally impossible. Rekal never updates or deletes a session row.
• Team-shared memory — rekal push and rekal sync share session context across your entire team through git. Every developer's agent benefits from every other developer's prior sessions.
• Git-native — No external infrastructure. Rekal data lives on standard orphan branches, syncs through your existing remote, and uses git's object store for point-in-time recovery. Every checkpoint is anchored to a commit SHA.
• DuckDB-powered — Full-text search (BM25), LSA vector embeddings, and file co-occurrence graphs built on DuckDB. The index is local-only and rebuilt on demand from the shared data.
• Agent-first — Progressive context loading. rekal <query> returns scored snippets and metadata — just enough for the agent to decide what matters. rekal query --session <id> drills into a specific session for full turns. The agent controls how much context it loads.
• Signal, not bulk — A 2-10 MB session file becomes a ~300 byte payload. The wire format is a custom binary codec with zstd compression, string interning via varint references, and append-only framing.

How It Works

flowchart TB
    subgraph capture ["Capture (post-commit hook)"]
        A["AI Session<br/>prompts, responses,<br/>tool calls, files"] -->|"rekal checkpoint"| B["data.db<br/><i>DuckDB — append-only</i>"]
    end

    subgraph index ["Index (local-only, rebuilt on demand)"]
        B -->|"rekal index"| C["index.db<br/><i>DuckDB — derived</i>"]
        C --- D["BM25 full-text search"]
        C --- E["LSA vector embeddings"]
        C --- F["File co-occurrence graph"]
        C --- G["Session facets &amp; filters"]
    end

    subgraph transport ["Transport (git orphan branches)"]
        B -->|"rekal push"| H["Wire Format<br/><i>rekal.body + dict.bin</i><br/>zstd · varint interning · append-only"]
        H -->|"git push origin<br/>rekal/&lt;email&gt;"| I["Remote<br/><i>per-user orphan branch</i>"]
        I -->|"rekal sync"| C
    end

    subgraph query ["Query (agent-driven)"]
        J["rekal 'keyword'"] -->|"hybrid BM25 + LSA"| C
        C -->|"scored JSON"| K["Agent"]
        K -->|"rekal query --session &lt;id&gt;"| B
        B -->|"full conversation"| K
    end

    style capture fill:#1a1a2e,stroke:#e94560,color:#eee
    style index fill:#1a1a2e,stroke:#0f3460,color:#eee
    style transport fill:#1a1a2e,stroke:#16213e,color:#eee
    style query fill:#1a1a2e,stroke:#533483,color:#eee

When you commit, Rekal automatically snapshots your active AI session into a local DuckDB database. rekal push shares it with your team on a per-user orphan branch — your git history stays clean.

Requirements

• Git
• macOS or Linux

Quick Start

# Install
curl -fsSL https://raw.githubusercontent.com/rekal-dev/cli/main/scripts/install.sh | bash

Install location: ~/.local/bin (override with REKAL_INSTALL_DIR).

# Initialize in a git repo
cd your-project
rekal init

# Check version
rekal version

When a newer release is available, the CLI prints an update notice after each command.

Commands Reference

Command	Description
rekal init	Initialize Rekal in the current git repository
rekal clean	Remove Rekal setup from this repository (local only)
rekal version	Print the CLI version
rekal checkpoint	Capture the current session after a commit
rekal push [--force]	Push Rekal data to the remote branch
rekal sync [--self]	Sync team context from remote rekal branches
rekal index	Rebuild the index DB from the data DB
rekal log [--limit N]	Show recent checkpoints
rekal [filters...] [query]	Recall — hybrid search (BM25 + LSA) over sessions
rekal query --session <id> [--full]	Drill into a session (turns, tool calls, files)
rekal query "<sql>" [--index]	Run raw SQL against the data or index DB

Recall Filters (root command)

Flag	Description
--file <regex>	Filter by file path (regex, git-root-relative)
--commit <sha>	Filter by git commit SHA
--checkpoint <ref>	Query as of a checkpoint ref on the rekal branch
--author <email>	Filter by author email
--actor <human|agent>	Filter by actor type
-n, --limit <n>	Max results (default: 20, 0 = no limit)

Examples

rekal init                              # Set up Rekal in your repo
rekal checkpoint                        # Capture current session
rekal push                              # Share context with the team
rekal sync                              # Pull team context
rekal sync --self                       # Pull your own context from another machine
rekal log                               # Show recent checkpoints
rekal "JWT expiry"                      # Recall sessions mentioning JWT
rekal --file src/auth/ "token refresh"  # Recall with file filter
rekal --actor agent "migration"         # Show only agent-initiated sessions
rekal query --session 01JNQX...        # Full turns for a specific session
rekal query --session 01JNQX... --full # Include tool calls and files
rekal query "SELECT * FROM sessions LIMIT 5"
rekal clean                             # Remove Rekal from this repo

Typical Workflow

# 1. Enable Rekal in your project
rekal init

# 2. Work normally — write code with your AI agent, commit as usual.
#    Rekal hooks into post-commit to capture sessions automatically.

# 3. Share your session context
rekal push

# 4. Pull your team's context
rekal sync

# 5. Your agent recalls prior decisions on the files it touches
rekal --file src/billing/ "why discount logic"

Architecture

Rekal uses two local DuckDB databases and a compact binary wire format:

• Data DB (.rekal/data.db) — Append-only shared truth. Normalized tables: sessions, turns, tool calls, checkpoints, files touched. The local query interface via rekal query.
• Index DB (.rekal/index.db) — Local-only search intelligence. Full-text indexes (BM25), LSA vector embeddings, file co-occurrence graphs. Never synced. Rebuild anytime with rekal index.
• Wire format (rekal.body + dict.bin) — Stored on per-user orphan branches (rekal/<email>). Append-only binary frames with zstd compression. This is what gets pushed/synced via git — the DuckDB databases are rebuilt from it.

The wire format can be inspected from any point in time using git:

git log rekal/alice@example.com     # checkpoint history
git show rekal/alice@example.com:dict.bin | xxd | head   # string dictionary

Schema documentation: docs/db/README.md. Wire format rationale: docs/git-transportation.md.

Benchmarks

Measured on two real repositories. All times in seconds, wall clock, macOS/arm64.

Dataset Size

Metric	165 sessions	57 sessions
Turns	14,019	3,929
data.db	13 MB	7.3 MB
index.db	18 MB	10 MB

Operation Timing

Operation	165 sessions	57 sessions
init (cold)	4.60s	0.98s
checkpoint (cold)	0.50s	2.66s
checkpoint (incremental)	0.51s	0.23s
index	0.85s	0.61s
push	0.18s	1.93s
sync	2.06s	1.78s
search "authentication"	0.15s	0.13s
search "database migration"	0.17s	0.14s
search "error handling"	0.16s	0.13s
query	0.14s	0.10s
log	0.14s	0.10s
clean	0.13s	0.10s

Search latency stays under 200ms even at 14k turns. The wire format keeps push times low — 0.18s for 165 sessions worth of data.

Development

Uses mise for tools and tasks.

git clone https://github.com/rekal-dev/cli.git rekal-cli
cd rekal-cli
mise install          # Install Go, golangci-lint

Common Tasks

mise run fmt              # Format code
mise run test             # Run unit tests
mise run test:integration # Run integration tests
mise run test:ci          # Run all tests (unit + integration) with race detection
mise run lint             # Run linters
mise run build            # Build rekal binary

Before committing: mise run fmt && mise run lint && mise run test:ci

Install the pre-push hook to run CI checks locally before each push:

./scripts/install-hooks.sh

See docs/DEVELOPMENT.md for full development guide.

Getting Help

rekal --help              # General help
rekal <command> --help    # Command-specific help

• Issues: github.com/rekal-dev/cli/issues

License

Apache-2.0 — see LICENSE.