Keycloak, Claude Code's headless OAuth tokens and language model types

Keycloak. Explored Keycloak, an open source, self-hosted equivalent of Microsoft Entra ID (Azure AD), a Java server.
Learning resources. Great learning materials curated at aman.ai. Spending a lot of time reading these.
Claude Code tokens. claude setup-token gives a one-year OAuth token tied to your subscription; export it as CLAUDE_CODE_OAUTH_TOKEN and Claude Code runs headless (claude -p "...") in CI/CD or scripts, billed against your subscription’s usage limits rather than a separate pay-per-token API key. Note - this only works for running Claude Code itself (CLI, -p mode, the GitHub Action, Agent SDK). It is not a general-purpose API credential.
Language models. There are two types of language models: masked language model (trained to predict missing tokens anywhere in a sequence, ex usage: sentiment analysis, text classification) and autoregressive language model (predict next token in sequence, using only preceding tokens, ex text generation).

Foundational models. It is easy to build cool demos with foundational models, it’s hard to create a profitable product.
Evals. Eval set is very important when building AI applications. Try to include different themed questions and answers as a golden set for better confidence and evaluations when building AI apps. Playing blind without evals is a nightmare when model upgrades are required, which you need to eventually.