SkillFoxx

Cellar CLI

Cellar prints signatures and docs for the public API of any JVM dependency so an agent stops inventing method calls.

  • 105 ★ on the repository
  • Last commit
  • MPL-2.0
CLI

Minimal access

Why this level

  • The tool reads local artifacts and prints reference output; anonymous telemetry is on only with consent.
All reasons and checks

virtuslab/cellarAuthor:VirtusLab

Install

Manual install

cs install --contrib cellar

The first README command (Coursier, native binary). A Claude Code plugin is available through `/plugin marketplace add virtuslab/cellar`.

Access and checks

How we review

Minimal accessThe tool runs nothing and makes no network calls.

  • The tool reads local artifacts and prints reference output; anonymous telemetry is on only with consent.

This is third-party code. Review the repository files before installing.

What it does

Cellar gives an agent and a human one command that returns exact type signatures, members and library documentation as Markdown on stdout, with no post-processing. Instead of parsing HTML docs or hunting for sources on GitHub, the agent gets the needed fragment straight from the artifact. It supports Scala 3 (TASTy, full set: signatures, flags, companions, sealed hierarchies, givens, extensions, docstrings), Scala 2 (signatures and members) and Java (classes, parameter names and Javadoc from `-sources.jar`). Example: `cellar get-external org.typelevel:cats-core_3:2.10.0 cats.Monad`. In Claude Code it connects as a plugin with the `/cellar:cellar` skill, or as a copy of `SKILL.md`.

Who it is for. Scala and Java developers whose agents mix up library signatures and invent methods that do not exist.

Good fit when

  • An agent writes a `cats.Monad` call and needs exact types.
  • A Java library reference with parameter names from sources is needed in the project.
  • A dependency version changed and the API has to be checked again.
  • A quick look at a sealed hierarchy is needed without opening a browser.

Not a fit when

  • The language is not JVM-based.
  • Usage examples are needed, not only signatures.
  • Any outbound data is forbidden, including anonymous telemetry.

Example request

Use Cellar to show the signatures of `cats.Monad` from `org.typelevel:cats-core_3:2.10.0` and list `flatMap` and `pure` with their types.

Limitations

Output quality for Scala 2 and Java is lower than for Scala 3: default values, docs and positions come from `-sources.jar` when present. Telemetry is collected only with consent: on first run in a non-interactive setting the command stops and prints a choice request until you run `cellar telemetry disable` or enable it. Coursier installs a GraalVM native binary, and building by hand needs JDK 17 and Mill.

How to disable. For the plugin run `/plugin uninstall`. The binary is removed with `cs uninstall cellar`, and telemetry settings live in the project `.cellar` directory and in user configuration.

FAQ

How do I install it?

Run `cs install --contrib cellar`. Nix also works: `nix profile install github:VirtusLab/cellar`.

How do I connect it to Claude Code?

With `/plugin marketplace add virtuslab/cellar` and `/plugin install cellar@virtuslab-cellar`. The skill appears as `/cellar:cellar`.

Which formats does it read?

Scala 3 via TASTy, Scala 2 via pickles and Java via `.class`; missing data comes from `-sources.jar`.

What about telemetry?

It stays off until you enable it. For agents without an interactive terminal Cellar prints a consent request and does not run the command.

What is the output format?

Plain Markdown on stdout that can go into a prompt without processing.

Discussion

No questions or reviews yet.

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README in short

One executable with Markdown output and a Claude Code plugin with a skill. Telemetry is opt-in.

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