The first time ralphctl graded itself it drew a line through its own history: unmeasurable before the instrument shipped, fully graded after.
Built in plain PostgreSQL 18 first, then driven from Spring Boot 4.1 through the JPA Criteria API, up to the exact line where Criteria runs out and one native query takes over. Runnable repo, 36 tests against real Postgres.
Records, sealed interfaces, and pattern matching are usually taught as three Java features. Together they form one modeling primitive that turns a fail-open security bug into a compile error.
Client ID Metadata Documents replace Dynamic Client Registration for MCP clients. How CIMD works in Spring, and what happened when Claude Code connected.
Spring Boot virtual threads move Tomcat's concurrency gate from 200 to 8192 without telling you. Where your real limit lives, measured, plus the fix.
A ralph loop is a coding agent in a while loop. What it is, why it resets context each pass, and how to run one without it spinning forever or costing $200 overnight.
Last post I confessed ralphctl broke users' data four times in a week with no clean fix. Ten releases later, it has one. The unglamorous month that took the harness from 'works in the demo' to something I trust to run overnight: safe migrations, a memory, parallel tasks, a real budget.
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