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Agent skill

Aster Self

by Zfinix in Zfinix/aster

Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each.

Apache-2.0Auto-check: notesAgent Workflows

Install Aster Self

skills CLI
$ npx skills add Zfinix/aster --skill aster-self -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Zfinix/aster aster-self --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Zfinix/aster.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/aster-skills/builtins/aster-self .claude/skills/aster-self && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
aster-self
GitHub stars
112
Token cost
~851 tokens
SKILL.md length
398 words
Files
1
Skills in repo
19
Repo updated
First seen
Licence
Apache-2.0

At a glance

Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each.

  • Any question about Aster itself
  • SKILL.md covers Where things live and Changing things
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Aster Self is an agent skill from Zfinix/aster. Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each. Use for any question about Aster itself.

Its SKILL.md is about 850 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows. It works with Model Context Protocol. The repository describes itself as: An open-source agent harness for software work. The licence is Apache-2.0.

When your agent uses it

  • Any question about Aster itself

Example prompts

  • “/aster-self”

What it can do on your machine

Read from SKILL.md and the folder at commit 3fbb67c. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Aster Self loads about 851 tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 398 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~43
When it runs · the whole SKILL.md, loaded when a task matches
~851

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteMentions a .env fileSKILL.md:22
    | API keys | `~/.aster/.env` | `.env` |
  • NoteMentions a .env fileSKILL.md:51
    er key unset VAR`. These write `~/.aster/.env` by default; `--local`
  • NoteMentions a .env fileSKILL.md:52
    writes the repo `.env`. There is no `--global` flag on `aster key`.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Zfinix/aster at commit 3fbb67c, republished under its Apache-2.0 licence (© Zfinix). 398 words, ~851 tokens.

Download SKILL.mdSave it as .claude/skills/aster-self/SKILL.md (or your agent's skills folder).
name
aster-self
description
Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each. Use for any question about Aster itself.

Aster, about itself

You are Aster. Answer questions about your own files and settings from this map; do not search the disk for them. When the answer depends on the current directory, confirm with one command (aster config path, aster key path, aster status) and quote what it prints. aster <command> --help is the source of truth for flags.

Where things live

~ is the home directory (%USERPROFILE% on Windows). The data root is $XDG_DATA_HOME/aster when that is set, otherwise ~/.local/share/aster.

WhatGlobalProject (repo root)
Config~/.aster/aster.yamlaster.yaml (or aster.yml, .aster.yaml)
API keys~/.aster/.env.env
MCP servers~/.aster/mcp.json.mcp.json, or mcp.servers in aster.yaml
Model policy~/.aster/mom.yamlmom.yaml, then .agents/mom.yaml
Scheduled runs~/.aster/cron/cron block in aster.yaml
Skills~/.local/share/aster/skills/<name>/SKILL.md.aster/skills/<name>/SKILL.md
Sub-agents~/.local/share/aster/agents/.aster/agents/
Plugins~/.local/share/aster/plugins/.aster/plugins/
Instructions~/.local/share/aster/AGENTS.md (also CLAUDE.md, ASTER.md)AGENTS.md, CLAUDE.md, ASTER.md
Memory~/.local/share/aster/memory/ASTER.md
Sessions~/.local/share/aster/sessions/<repo-slug>/
Sign-ins~/.local/share/aster/credentials.json

A project file wins over the global one. For settings the order is CLI flags, then shell env, then the project aster.yaml, then the global one, then defaults. A project skill shadows a global skill of the same name. API keys are never read from aster.yaml.

Show full SKILL.md (212 more words)Show less

Changing things

Prefer these commands over hand-editing: they check the file still parses.

  • Settings: aster config list shows every key, its value, and where it came from. aster config set KEY VALUE --global|--local, aster config unset KEY, aster config edit --global|--local. Plain aster config opens a form.
  • Model and provider: aster model and aster provider list and switch them. The default model for every repo is aster config set review.model <id> --global (the key is review.model, not model).
  • Keys: aster key list, aster key set VAR (prompts without echo), aster key unset VAR. These write ~/.aster/.env by default; --local writes the repo .env. There is no --global flag on aster key.
  • Skills: aster skills add <owner/repo|path|agent> [-p], aster skills list, aster skills remove NAME, aster skills init NAME. A new skill can also be written straight to the skills folder above; it loads next session.
  • Plugins: aster plugins add|list|remove.
  • MCP: aster mcp add|list|enable|disable|remove|login, aster mcp import to copy servers from another coding tool.
  • Memory: aster remember "fact", aster memory list|add|remove|show.
  • Instructions: edit the AGENTS.md for the scope you want.
  • Binary: aster upgrade.

A change to config, skills, plugins, or MCP takes effect in the next session. After editing a config file by hand, run aster config list to confirm it still parses.

© Zfinix, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/aster-skills/builtins/aster-self of Zfinix/aster.

Open the folder on GitHubat commit 3fbb67c

Compare with similar skills

Aster Self next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Aster Self compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Aster Self this skillZfinix/aster112—~851Automated safety check: NotesApache-2.0
MCP Server Builderanthropics/skills180k64 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k5 repos~1.2kAutomated safety check: PassMIT
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Fastmcp Client CLIPrefectHQ/fastmcp28k1 repos~823Automated safety check: PassApache-2.0
MemPalace Memory SearchMemPalace/mempalace59k—~1.4kAutomated safety check: PassMIT

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Works with

Categories

Questions about Aster Self

What does Aster Self do?

Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each. Aster Self is an agent skill from Zfinix/aster. Aster's own files and settings, where config, keys, skills, sessions, and memory live and the command that changes each.

When should I use Aster Self?

Aster Self fits situations like: any question about Aster itself.

How do I install Aster Self in Claude Code?

Run `npx skills add Zfinix/aster --skill aster-self -a claude-code`. Or copy the skill folder (crates/aster-skills/builtins/aster-self in Zfinix/aster) into .claude/skills/aster-self in your project. Claude Code loads it when a task matches its description.

How do I install Aster Self in Codex?

Run `npx skills add Zfinix/aster --skill aster-self -a codex`. Or copy the skill folder (crates/aster-skills/builtins/aster-self in Zfinix/aster) into .agents/skills/aster-self in your project. Codex loads it when a task matches its description.

Can I use Aster Self in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Zfinix/aster --skill aster-self -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/aster-self, .gemini/skills/aster-self, .github/skills/aster-self and .opencode/skills/aster-self in your project.

What does Aster Self need to run?

SKILL.md names no scripts, command-line tools or credentials: Aster Self is instructions for the agent only.

Does Aster Self access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Aster Self safe to install?

Our automated static check of SKILL.md found notes only (mentions a .env file), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Aster Self use?

Aster Self is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Aster Self use?

About 851 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Aster Self?

Skills that share tags, products or a category with Aster Self: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Fastmcp Client CLI (PrefectHQ/fastmcp, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Aster Self?

Zfinix (a GitHub user) maintains it in Zfinix/aster, which has 112 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on October 6, 2026.

Source: Zfinix/aster on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.