jskim 0.1.1

Token-saving Java file reader for Claude Code. Summarizes Java files compactly using tree-sitter, saving 70-80% of input tokens.

jskim

Token-saving Java file reader for Claude Code, optimized for Spring Boot. Summarizes Java files compactly using tree-sitter, saving 70-80% of input tokens compared to reading files directly.

A human counted the tokens. An AI counted the getters. Both decided life's too short.

Installation

pip install jskim

Requires Python 3.10+.

Usage

jskim auto-detects the mode based on whether you pass a file or directory.

Summarize a Java file

jskim <file.java>
jskim <file.java> --grep <pattern>        # filter methods by name/signature
jskim <file.java> --annotation <@Ann>     # filter methods by annotation
jskim A.java B.java C.java                # multiple files

Project map

Generates a compact map of all Java files in a directory: packages, classes, annotations, field/method counts, Lombok usage, enum constants.

jskim <src_dir>
jskim <src_dir> --deps                 # import-based dependencies
jskim <src_dir> --endpoints             # REST endpoint map
jskim <src_dir> --beans                 # Spring bean DI graph + @Bean producers + config properties
jskim <src_dir> --package <prefix>      # filter by package
jskim <src_dir> --annotation <@Ann>     # filter by class annotation
jskim <src_dir> --extends <ClassName>   # filter by superclass
jskim <src_dir> --implements <Name>     # filter by implemented interface

Spring Boot flags:

• --endpoints — lists all REST endpoints: HTTP method, full path (base + method), handler, line number
• --beans — shows bean DI wiring (via @Autowired and @RequiredArgsConstructor + final fields), @Bean factory method producers, and @ConfigurationProperties with prefix + field details
• --implements — filter classes by implemented interface name

Extract methods

jskim <file.java> --list                          # list all methods
jskim <file.java> <method_name>                    # extract one method
jskim <file.java> <method1> <method2> <method3>    # extract multiple

Usage as a Claude Code Skill

This project is designed to be used as a Claude Code skill. The SKILL.md file configures the skill behavior, auto-triggering when working with Java files.

Install by adding the skill directory to your Claude Code configuration. Once installed, invoke with /jskim:

/jskim <file.java>              # summarize a file
/jskim <src_dir>                # project map
/jskim <file.java> <method>     # extract a method

Workflow

1. Explore — jskim src/ to understand project structure
2. Narrow — jskim src/ --package com.example.billing to focus on a package
3. Spring context — jskim src/ --endpoints --beans to see REST API + DI wiring
4. Understand — jskim File.java to see class structure
5. Filter — jskim File.java --grep billing for large classes
6. Focus — jskim File.java methodA methodB to read specific methods
7. Edit — Use Read with offset/limit on only the lines that matter

Dependencies

• tree-sitter — Incremental parsing library
• tree-sitter-java — Java grammar for tree-sitter