# Changelog

What changed for developers building on RALPH, newest first. Entries are written by hand when a change reaches you.

## 27 September 2026

**The MCP tool list is fresh for an hour.** Apps on the 2026-07-28 MCP version are told how long the tool list stays current, so they fetch new tools without a reconnect.

## 26 September 2026

**The MCP tool surface is versioned.** It starts at 1.0.0 and follows SemVer. New arguments are optional, and a breaking change gets a new tool name.

**Availability rules repeat.** A rule can repeat daily, weekly, monthly or yearly.

## 23 September 2026

**The setup interview is served by the server.** Ask your agent to set up your organisation, in any app: it's the `setup_guide` tool, and the `ralph-org-setup` prompt.

**`list_categories`** reads back the kinds of flying you sell, with the codes bookings and flights take.

## 22 September 2026

**The setup tools correct what they wrote.** Update a person, an aircraft, a category, a policy, an availability rule or the organisation itself, through your agent.

## 21 September 2026

**Set up an organisation through your agent.** Add aircraft, people, categories, availability rules, policies and members. Fields only you can know, such as a registration or a meter reading, are asked for, never guessed.

## 8 September 2026

**The `ralph` CLI.** Sign in through the browser, and mint, check and revoke agent keys.