Reasonbook
Decisions and project context that survive AI coding sessions.
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Reasonbook is an Apache-2.0 MCP server and CLI that records project decisions, reasons, and next steps in a local SQLite database.
- for
- Developers using AI coding agents who need persistent project context.
- pricing
- open source
- license
- Apache-2.0
Key features
- SQLite decision ledger — Stores each decision, its reason, and learning in a local SQLite file within the repo.
- Session handoff — Agents retrieve prior decisions automatically at the start of a new session.
- Planning extensions — Planner adds next steps; Builder adds sprints, missions, objectives, and success criteria.
- Local-first operation — Runs without network connection or account; all data stays in the repository.
- Optional dashboard sync — Uploads the SQLite DB to a hosted dashboard for sharing and messaging between projects.
- Claude Code & Codex plugin — One-click installation brings the record into Claude Code and Codex sessions.
Use cases
- Resume an AI coding session with full knowledge of prior decisions.
- Provide agents with project context to avoid repeating earlier choices.
- Add structured planning (sprints, missions) that references past decisions.
- Share a project's decision history across multiple agents via the optional dashboard.
Reasonbook vs alternatives
 Reasonbook |  Selvedge |  Unified MCP Server |  MemoryGraph |  Pipelex | |
|---|---|---|---|---|---|
| Best for | Persistent decision logs for AI agents | Agent memory of dead ends | Broad MCP integration platform | Graph-based MCP memory | Declarative AI workflow authoring |
| Pricing | Open source | Free | Subscription | Free | Free |
| DevHunt upvotes | 1 | 38 | 29 | 7 | 40 |
| Launched | Oct 2031 | Oct 2026 | Jan 2026 | Dec 2025 | Oct 2025 |
- Reasonbook vs Selvedge: Focuses on memory for coding agents but does not provide a local SQLite ledger or planning extensions.
- Reasonbook vs Unified MCP Server: A general MCP server with many integrations; Reasonbook is a lightweight, local-first solution.
- Reasonbook vs MemoryGraph: Graph-based memory server, whereas Reasonbook uses a simple relational SQLite store.
- Reasonbook vs Pipelex: Provides a declarative language for AI workflows, not a decision-recording database.
Reasonbook FAQ
Do I need an online account to use Reasonbook?+
No, the core functionality runs locally with no account; the dashboard is optional.
How does Reasonbook work with Claude Code?+
Install the plugin via the Claude marketplace; it automatically loads the SQLite record at session start.
Can I share my decision database with other projects?+
Yes, you can enable uploads to the hosted dashboard, which provides an address for other projects to access.
Is Reasonbook compatible with other AI agents besides Claude?+
Reasonbook provides a CLI and npm package that can be called from Codex and other tools.
What license is Reasonbook released under?+
Reasonbook is released under the Apache-2.0 license.
Summarized by DevHunt from reasonbook.ai · Oct 28, 2026. Details may change; check the official site.
