What is astrolabe?
astrolabe is a Claude Code mod by jonyfs that spec Kit progress and usage governance for Claude Code: a phase rail above the prompt, the next command in the prompt hint, the current task on the spinner, a /astrolabe pane, toasts,. It is listed under Cost & usage and has 1 GitHub stars.
| Type | Claude code mod |
|---|---|
| Author | jonyfs |
| Repository | jonyfs/astrolabe |
| Popularity | 1 GitHub stars |
| Category | Cost & usage |
| Security | High risk (36/100) |
| Rank | #1,878 of 5,272 Claude Code mods; #325 in Cost & usage |
| License | MIT |
| Last commit | 2026-10-13 |
| Hooks | 13 events |
| Sees | Agent calls, Bash calls, Edit calls, NotebookEdit calls, Read calls, Skill calls, TodoWrite calls, Write calls, every prompt, every tool call |
| Draws on | Pane, CommandOutput, ToolUse, AbovePrompt, PromptHint, TurnDuration, Spinner |
Is astrolabe safe to install?
astrolabe scores 36/100 on the MCPMods security check: High risk. Things to review: sends data over the network; starts processes outside the sandbox; writes files or config; reads environment variables; watches every prompt or event. It passed 2 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| Sends data over the network | Review |
| Starts processes outside the sandbox | Review |
| Writes files or config | Review |
| Reads environment variables | Review |
| Watches every prompt or event | Review |
| Drives Claude (model calls, prompts) | Note |
| Passes claude plugin validate | Pass |
| Has an open-source license | Pass |
API calls in its code
| Call | What it means |
|---|---|
$.clock.after | |
$.clock.every | |
$.clock.now | |
$.command.register | |
$.command.run | drives Claude |
$.config.list | |
$.config.set | changes config |
$.env.get | reads env vars |
$.fs.exists | reads files |
$.fs.list | reads files |
$.fs.read | reads files |
$.fs.stat | reads files |
$.fs.write | writes files |
$.http.fetch | network requests |
$.model.complete | drives Claude |
$.model.fork | drives Claude |
$.process.run | runs processes |
$.prompt.submit | drives Claude |
$.prompt.suggest | writes the prompt box |
$.session.cwd | |
$.session.id | |
$.session.usage | |
$.state.get | |
$.state.set | |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.tool.call | drives Claude |
$.ui.ask | draws interface |
$.ui.close | draws interface |
$.ui.copy | draws interface |
$.ui.focus | draws interface |
How do I install astrolabe?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/jonyfs/astrolabe claude plugin validate ./astrolabe/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
claude plugin marketplace add jonyfs/astrolabe && claude plugin install astrolabe@astrolabe
Or ask Claude to set it up
Paste this into Claude Code and it installs astrolabe for you:
Install the "astrolabe" Claude Code mod from https://github.com/jonyfs/astrolabe. Run claude plugin validate on it first and show me what it can access before you enable it.