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Last updated 2026-07-28

MirethSpace 0.3.3 and Mireth Harness · Prompts tuned for Claude Fable 5.1

September 7, 2026

  • MirethSpace 0.3.3 gives the Assistant room to answer on Claude Fable 5.1: the reply cap rises from 2048 to 16000 tokens, so thinking no longer starves the reply. Swarm role presets now explain how the mailbox works.
  • The Mireth Harness no longer sends a Claude model a half-finished message to continue from, which Claude rejects. When Claude declines a request under its content policy, the reason is shown instead of a bare refusal. Run /update to get it.
  • Harness prompts say their rules once, at normal volume: the compaction summary, the clarify tool, the delegate brief and the identity contract. Compaction no longer rewrites the system prompt, so the provider's cache stays warm.
  • MirethMCP tool descriptions now state what each tool returns and which fields an update replaces.

MirethSpace 0.3.2 and Mireth Harness · A correctness pass, and skills in the harness

September 4, 2026

  • MirethSpace 0.3.2 fixes the places work could go missing. Checkpoints no longer drop command blocks while an earlier one is still saving, a stale git lock no longer disables them for a project, and a stale worktree past its cutoff keeps a branch that still holds unpushed commits.
  • The board and agent list show only the active project, a delete that failed offline is retried, splitting a pane opens its terminal immediately, and Quick Open finds dotfiles.
  • The Mireth Harness now ships seven skills you run by name: /code-review, /commit, /debug, /explore, /perf, /refactor and /test. Run /update to get them.
  • Harness fixes: on Windows a deleted file can be undone with /rollback, Claude streams like every other provider, /resume brings the plan back and not just the conversation, a delegated child survives a rate limit instead of dying, and verify-on-stop is on by default when the project has a verify command.

MirethSpace 0.3.1 and Mireth Harness · Claude Fable 5.1 is in

September 1, 2026

  • Claude Fable 5.1 is now in the Assistant picker in MirethSpace and in the /model menu of the Mireth Harness, on Anthropic and OpenRouter. Update the app, or run /update in the harness, and it is there.
  • Every panel got a pass. Sending a task to a terminal tells you when there is no free pane instead of pretending it worked, removing a swarm agent asks first, a routine cannot take a name that is already in use, and a prompt that fails to save says so.
  • Memory graph fixes: it no longer shows a previous folder's notes after you switch, labels stop growing as you zoom, and the highlight follows a reload.
  • Smaller fixes: a double click on a file opens one editor tab, block timings never print odd durations, a cleared pane's checkpoints stay cleared, and an agent launched from a cmd.exe pane gets its full instructions.

MirethSpace 0.3.0 · Steadier under load

September 1, 2026

  • If you are on 0.2.9, update now. A window bug in that build stops the app from closing normally. This release fixes it.
  • Terminals report their real state. An idle terminal reads idle instead of sitting on a permanent working spinner, and a command you recall with the Up arrow keeps its output.
  • Agent panes speak up. When a CLI stops to ask permission, the pane shows it, the tab badges it, and closing that tab warns you first.
  • Your work survives a project switch. Tasks and agents keep unsaved edits, cards stay in the project you made them in, and a stray click outside a task no longer discards what you typed.
  • Sending a task to a terminal now saves the instructions you edited, and editing one agent no longer overwrites another.
  • Connections are steadier. A pasted API key is checked before the app calls itself connected, a rejected key cannot sign you out, signing in works even if you closed the app partway through, and a slow server can no longer leave the app waiting forever.
  • Smaller fixes: opening a file reveals the editor panel if you had collapsed it, closing a background editor tab no longer switches to it first, and merge review reports a failed read instead of showing an empty diff.

MirethSpace 0.2.7 to 0.2.9 · Terminal and worktree stability

August 2026

  • Terminals stopped wedging after heavy pane use. The cause was in the terminal plugin itself, so closing a pane now fully releases its console and slow terminal work no longer blocks the app.
  • Agent launches wait for the shell to actually be ready, and a terminal that fails to start now recovers on its own instead of sitting blank.
  • Isolated worktrees are safer to remove, and merge review no longer offers a destructive path without warning.
  • Assorted fixes: deleting a routine cleans up its script, memory note titles keep their punctuation, and the kanban board stopped reshuffling cards on every sync.

Mireth Harness 0.1.0 · The command line agent

August 17, 2026

  • Mireth Harness is a terminal coding agent: launch it in any terminal, point it at a model, and it reads, writes and runs code for you. Every risky command asks first.
  • Install it with one line from the download page. It needs Node.js 20.3 or newer and nothing else: no compiler, no native modules.
  • It runs on every model Mireth offers, Alexandr included, and switches between them with /model.
  • Type /update inside the CLI to pull the newest build and rebuild in place. /balance shows what is left on the provider you are using.
  • A waiting indicator now shows how long the model has been thinking, so a slow turn no longer looks like a hang.

MirethSpace 0.2.6 · Alexandr can search the web

July 28, 2026

  • Alexandr now searches the internet when a question needs current information, like prices, versions or news, and cites where the answer came from.
  • He also knows today's date. Both work in the Alexandr tab and in the right-rail Assistant when he is the selected model.
  • Answers that use tools arrive all at once rather than word by word, and the waiting notes now say what he is doing.

MirethSpace 0.2.5 · New home screen

July 27, 2026

  • Alexandr now has its own card on the home screen, right alongside Mireth's Forge and Forge Swarm.
  • Delete projects straight from the home screen.
  • The wordmark and hero text now use the same display font as the website, instead of the system default.
  • Fixed a rare visual flash when launching Alexandr, a stale reference left behind after deleting a project, and the command-blocks panel popping open unannounced.

Alexandr · The Mireth model goes live

July 23, 2026

  • Alexandr, the Mireth model, is live. Talk to him free on the Chat page with any Mireth account: zero credits, on every plan.
  • He is built for agentic development: planning, building, and reviewing, with the frontier models one click away in the same picker.
  • His first reply after a quiet spell can take up to a minute while he wakes. That is normal.

MirethSpace 0.2.4 · Signed on every platform

July 23, 2026

  • Keyboard reliability: preventive fixes for a rare state where all keyboard input stopped responding, plus diagnostics to catch any recurrence.
  • The Windows installer is now code-signed (Authenticode).
  • The macOS app is signed and notarized by Apple. It opens like any Mac app, no right-click workaround. One universal download for Intel and Apple Silicon.

MirethVoice 0.1.2 · Signed installer + macOS

July 23, 2026

  • The Windows installer is now code-signed (Authenticode). No functional changes.
  • MirethVoice for macOS (signed and notarized) is now on the download page.

MirethSpace 0.2.3 · Editor artwork

July 21, 2026

  • New editor empty-state artwork replaces the background image that showed phantom zoom buttons.

MirethVoice 0.1.1 · Widget polish

July 21, 2026

  • The floating widget window is now titled MirethVoice instead of a raw framework label.

MirethVoice 0.1.0 · MirethVoice launches

July 21, 2026

  • Voice dictation for your agents: local whisper transcription runs free on-device; Groq cloud transcription on the Pro plan.
  • Auto-update built in from day one.

MirethSpace 0.2.2 · Account info fix

July 21, 2026

  • Fixed Settings showing “Connected” without your email or credits after startup. Credits now load reliably from boot.
  • The app now recovers your sign-in automatically if the local token store returns a bad read.

MirethSpace 0.2.1 · First auto-update

July 21, 2026

  • Your account email now shows in desktop Settings.
  • First release delivered through the built-in auto-updater.

MirethSpace 0.2.0 · Launch

July 21, 2026

  • First public release: parallel AI agents building in real terminals, on your machine.
  • Downloads for Windows and macOS.
Mireth · Docs