What Six Codex Runs Taught Me About Tool Design

Description and use

Six Codex runs with Seed4J CLI demonstrated how models differ in selecting and planning modules to scaffold a Java project with Maven, Maven Wrapper, and JaCoCo, and how they implement a String Calculator that passes all tests.

Problem

Developers need a repeatable way to scaffold Java projects and implement katas while minimizing manual configuration and decision errors.

Outcome

All six runs produced a working String Calculator implementation that passed the provided tests and the independent test suite, with scores ranging from 91 to 98 out of 100.

Workflow

• 1. Agent interprets goal and selects capabilities
• 2. Skill discovers available modules and inspects help
• 3. Agent plans a composition of modules
• 4. Seed4J CLI validates and orders the composition
• 5. Seed4J applies modules, creating commits
• 6. Agent verifies build and tests

Evidence

All six produced a working String Calculator implementation, passed the build included in the project and passed the same independent tests covering the kata requirements.

Source

The Sol xhigh run inspected init, maven-java, maven-wrapper and jacoco-with-min-coverage-check, then placed all four modules into one apply-set plan.

Source