---
title: Changelog
description: Product changes for Specdiff and Envlock.
url: https://pr-1-7cfcfe393d12.thally.app/changelog
---

# Changelog

Product changes for Specdiff and Envlock.

## 0.1.0

_2026-09-17_

Initial release of the Seamline toolkit.

### Specdiff

- **`@specdiff/core` 0.1.0** — JSON Schema and OpenAPI diff engine with 45 built-in rules, direction-aware severity, and three output formatters (text, Markdown, JSON).
- **`@specdiff/cli` 0.1.0** — `specdiff` command for comparing documents, listing rules, and explaining individual rule codes. Supports `--fail-on` for CI gating.
- **`@specdiff/mcp` 0.1.0** — MCP server exposing `specdiff_compare`, `specdiff_explain_rule`, `specdiff_list_rules`, and `specdiff_format` tools for coding agents.

### Envlock

- **`@envlock/core` 0.1.0** — Schema DSL with ten field types (`string`, `number`, `integer`, `boolean`, `port`, `url`, `enum`, `json`, `duration`, `list`), validation, `.env` parsing, `.env.example` rendering, diffing, and secret redaction.
- **`@envlock/cli` 0.1.0** — `envlock` command with `check`, `example`, `diff`, `inspect`, and `init` sub-commands.
- **`@envlock/mcp` 0.1.0** — MCP server exposing `envlock_check`, `envlock_inspect`, `envlock_render_example`, `envlock_diff`, and `envlock_explain_issue` tools plus a schema resource template.