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Agent skill

Aster CLI

by Zfinix in Zfinix/aster

Guidance for using the aster CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills.

Apache-2.0Auto-check passedDevelopment

Install Aster CLI

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

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

GitHub CLI
$ gh skill install Zfinix/aster aster-cli --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/skills/aster-cli .claude/skills/aster-cli && 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-cli
GitHub stars
112
Token cost
~1.2k tokens
SKILL.md length
379 words
Files
1
Skills in repo
19
Repo updated
First seen
Licence
Apache-2.0

At a glance

Guidance for using the aster CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills.

  • Designing aster commands
  • SKILL.md covers Setup, Reviewing code, Chat and fixes and Sessions and memory, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Reviewing a diff

What it does

Aster CLI is an agent skill from Zfinix/aster. Guidance for using the aster CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills. Use when running or designing aster commands, reviewing a diff or PR with aster, or when the user mentions aster review, aster chat, aster fix, or aster.yaml.

Its SKILL.md is about 1.2k 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 Development, covering Code review. The repository describes itself as: An open-source agent harness for software work. The licence is Apache-2.0.

When your agent uses it

  • Designing aster commands
  • Reviewing a diff
  • The user mentions aster review

Example prompts

  • “/aster-cli”

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 (its code samples are bash).

    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 CLI loads about 1.2k tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 379 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~86
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

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 passed

The automated check found no risky patterns in SKILL.md.

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). 379 words, ~1,195 tokens.

Download SKILL.mdSave it as .claude/skills/aster-cli/SKILL.md (or your agent's skills folder).
name
aster-cli
description
Guidance for using the `aster` CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills. Use when running or designing aster commands, reviewing a diff or PR with aster, or when the user mentions `aster review`, `aster chat`, `aster fix`, or aster.yaml.

Aster CLI

Aster is an AI coding agent that works in your repository: it reads and searches the code, answers questions, applies edits, and runs a review pipeline that forms hypotheses about defects, verifies them against the codebase, and reports shaped findings. It runs locally against the current repo and needs an aster.yaml (created by aster init).

Setup

sh
aster init          # pick a provider, write aster.yaml, store the API key
aster login         # optional: link GitHub via device flow (needed for PR reviews)

aster init is interactive. Run it once per repo; keys are stored outside the repo so aster.yaml is safe to commit.

Reviewing code

sh
aster review                    # review the current branch against its base
aster review main..HEAD         # review an explicit range
aster review path/to/file.rs    # review a single file
aster review --pr 123           # review a GitHub PR (requires aster login)

Review output is a list of findings. Prefer reviewing the smallest meaningful diff: a branch or range, not the whole repo.

Chat and fixes

sh
aster chat                      # interactive TUI with the review agent
aster chat --print "question"   # one-shot answer to stdout (use this from scripts and agents)
aster fix                       # apply model-generated fixes for findings (dry-run by default)

As an agent, always use aster chat --print rather than the TUI. aster fix never writes without an explicit apply flag; run it plain first and inspect the dry-run output.

Sessions and memory

sh
aster sessions                  # list saved chat sessions for this repo
aster sessions show <id>        # print a session's full transcript
aster memory                    # list stored durable memory
aster memory add "fact"         # append a fact to project memory
aster memory add --title t "…"  # save a titled memory block

Both accept --json; see below.

Skills

Aster loads agent skills from .aster/skills (project) and <config>/aster/skills (user-global).

sh
aster skills add owner/repo     # install skills from a GitHub repo (also: git URL or local path)
aster skills add -g owner/repo  # install user-global instead of project
aster skills add owner/repo -l  # list what a source offers without installing
aster skills list               # list installed skills
aster skills use owner/repo@x   # print a skill's instructions without installing
aster skills find <query>       # search GitHub for skills interactively
aster skills update             # update all installed skills
aster skills remove <name>      # remove a skill
aster skills init <name>        # scaffold <name>/SKILL.md

add flags: -s/--skill to pick specific skills (* for all), --all for everything without prompts, -y to skip confirmation, --force to overwrite, --full-depth to keep searching inside a directory that already has a SKILL.md.

Machine-readable output

--json is global: every command takes it, before or after the subcommand, and prints one JSON value on stdout. Failures come back the same way, {"ok":false,"error":"…"} with a non-zero exit, so a caller parses one shape.

sh
aster --json sessions list
aster --json skills list
aster --json memory add "fact"
aster review --json

--json also forces non-interactive behavior: wizards and prompts are skipped, so a command either completes or errors instead of hanging.

Show full SKILL.md (134 more words)Show less

Modes and effort

How the agent is allowed to act (--permission-mode on aster chat, or permissions.mode in aster.yaml):

  • plan — explore and present a plan, never edit
  • manual — ask for approval before each edit (needs the TUI or --stream)
  • auto — apply what passes the safety check, pause for anything risky
  • edit — edit files without asking (the default)

--effort <off|low|medium|high> sets the reasoning budget for thinking models on chat, aster review, and aster fix, overriding ASTER_EFFORT and review.effort in aster.yaml. In the TUI, /mode cycles modes and /effort sets the budget.

Conventions

  • Non-interactive contexts (CI, agents): use --print, --json, and -y variants; never invoke the TUI.
  • Every command supports --help; check it before guessing flags.
  • Before editing aster.yaml, check docs/CONFIG.md for the key and its default. Unknown keys are a hard parse error, not a warning.

© 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 skills/aster-cli of Zfinix/aster.

Open the folder on GitHubat commit 3fbb67c

Compare with similar skills

Aster CLI 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 CLI compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Aster CLI this skillZfinix/aster112—~1.2kAutomated safety check: PassApache-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT
Backend Code Reviewlangflow-ai/langflow156k—~3.5kAutomated safety check: NotesMIT
Understand Diff AnalysisEgonex-AI/Understand-Anything86k1 repos~1.4kAutomated safety check: PassMIT
Mole Bug Patternstw93/Mole70k—~2kAutomated safety check: PassGPL-3.0

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  • PR Babysitter

    openinterpreter/openinterpreter

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    69k GitHub starsUsed in 3 repos~4.2k tokens
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  • Code Review Checklist

    shareAI-lab/learn-claude-code

    Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.

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    156k GitHub stars~3.5k tokensUpdated today
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  • Understand Diff Analysis

    Egonex-AI/Understand-Anything

    Reads your git changes or a pull request against a prebuilt knowledge graph of the project to explain what changed, which components are affected and what is risky.

    86k GitHub starsUsed in 1 repo~1.4k tokens
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  • Mole Bug Patterns

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More from Zfinix/aster

All 19 skills in this repo

  • Artifact Design

    Zfinix/aster

    Designing and building any user-facing surface: a web page, landing page, dashboard, report, HTML document, email, or a component inside an existing app.

    112 GitHub stars~2.8k tokensUpdated yesterday
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  • Aster Chat Sessions

    Zfinix/aster

    Drive aster chat programmatically and manage sessions and memory: one-shot --print/--json answers, --messages-json for caller-owned history, --continue and --session persistence, --allow-edits…

    112 GitHub stars~591 tokensUpdated yesterday
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  • Aster Config

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    Reference for aster.yaml, covering review models, analyzers, focus areas, include/exclude globs, minconfidence, and the permissions block that gates edits.

    112 GitHub stars~1.2k tokensUpdated yesterday
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  • Aster Fix Workflow

    Zfinix/aster

    Pipe aster review findings into aster fix to generate and apply patches safely, using review --json, fix --findings-json, dry-run inspection, --apply, and permission gating.

    112 GitHub stars~534 tokensUpdated yesterday
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  • Aster Planning

    Zfinix/aster

    Create and execute structured plans for multi-step tasks. An agent skill from Zfinix/aster.

    112 GitHub stars~1k tokensUpdated yesterday
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  • Aster Review CI

    Zfinix/aster

    Run aster code reviews non-interactively in CI, GitHub Actions, or from another agent.

    112 GitHub stars~640 tokensUpdated yesterday
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Categories

Questions about Aster CLI

What does Aster CLI do?

Guidance for using the aster CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills. Aster CLI is an agent skill from Zfinix/aster. Guidance for using the aster CLI to work in a codebase with an AI agent: chat and edit code, run AI code reviews, apply fixes, and manage sessions, memory, and skills.

When should I use Aster CLI?

Aster CLI fits situations like: designing aster commands; reviewing a diff; the user mentions aster review.

How do I install Aster CLI in Claude Code?

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

How do I install Aster CLI in Codex?

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

Can I use Aster CLI 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-cli -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-cli, .gemini/skills/aster-cli, .github/skills/aster-cli and .opencode/skills/aster-cli in your project.

What does Aster CLI need to run?

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

Does Aster CLI 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 CLI safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Aster CLI use?

Aster CLI 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 CLI use?

About 1.2k tokens (SKILL.md is roughly 4.8k 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 CLI?

Skills that share tags, products or a category with Aster CLI: PR Babysitter (openinterpreter/openinterpreter, 69k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Backend Code Review (langflow-ai/langflow, 156k stars) and Understand Diff Analysis (Egonex-AI/Understand-Anything, 86k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Aster CLI?

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.