piotr-yuxuan/malli-cli — Configuration powertool with `metosin/malli`

Description and use

**Brief summary**
Malli‑CLI is a lightweight Clojure‑based powertool that wraps the metosin/malli schema library, offering a command‑line interface for generating, validating, and visualising Malli schemas. It streamlines routine tasks such as schema scaffolding, data‑validation checks, and CI‑friendly reporting, helping engineers cut down on repetitive boilerplate and accelerate review cycles.

**Value**

• **Time‑saving**: Generates schema skeletons and validation reports with a single command, eliminating manual copy‑paste and reducing the cognitive load of schema maintenance.
• **Workflow integration**: Works as a CLI, SDK, or API, so it can be dropped into local dev scripts, pre‑commit hooks, or CI pipelines to surface schema errors early.
• **Consistency**: Enforces a single source of truth for data contracts across a codebase, improving code review quality and downstream consumer confidence.

**Practical adoption path**

1. **Pilot** – Add malli-cli as a dev‑dependency in a small service or library and run its generate command to scaffold a few Malli schemas.
2. **Automation** – Hook the validate command into a pre‑commit or CI step (e.g., GitHub Actions) to automatically fail builds on schema mismatches.
3. **Scaling** – Extend the CLI usage to all repositories in the monorepo, optionally wrapping it in internal scripts (npm, Make, or Babashka) for a unified developer experience.
4. **Feedback loop** – Collect developer feedback, tune the CLI flags, and document the standard workflow in the team’s onboarding guide.

**Production readiness**

• **Maturity**: Medium. The project has 57 stars, recent activity (last commit 2026‑05‑12), and a modest fork count, indicating a functional but still niche tool.
• **Stability**: Suitable for prototypes, internal tooling, or as a CI helper; the core Malli library is production‑grade, but malli-cli itself should be vetted for edge‑case handling and version compatibility.
• **Risks**: License and security posture need a final check, and the maintainer’s long‑term commitment is unclear. Before shipping to production, perform a dependency audit, lock the CLI version, and add integration tests that verify expected behaviour in your CI environment.

Overall, Malli‑CLI can be adopted quickly to boost developer productivity, provided you perform the standard due‑diligence steps around licensing, security, and version pinning.

Problem

piotr-yuxuan/malli-cli helps engineers save time in daily development and review loops.

Outcome

Medium: useful for prototypes or internal workflows, with dependency and maintenance checks before production.

Workflow

• speed up developer workflows
• automate local engineering tasks
• improve CI feedback

Evidence

Configuration powertool with metosin/malli

Source