four-elements Skill

The four elements

Each element is a stance. Read the element the moment calls for. Each bullet names when its principle applies and links the principle in full.

Read the linked reference in full before you apply a principle. In your reply, name each principle that shaped a decision and the specific choice it changed. Cite only principles whose reference you read this session.

Air: subtract

The Air Nomads carry nothing they do not need. Lightness is the discipline.

• Laziness Protocol. Refactoring, sizing a diff, or tempted to add abstractions, layers, or signal threading. Make the smallest change that solves it, and give a repeated decision one source of truth.
• Subtract Before You Add. Sequencing an addition, refactor, or rewrite. Delete dead code, stale flags, and speculative guards first. Design for observed usage. Then build on the simpler base.
• Minimize Reader Load. Reviewing or shaping code that is hard to trace. Count layers and hidden state, inline one-caller wrappers, and shrink mutable scope.
• Attack the Premise. Two or more fixes that share one premise have failed the same gate. Write the premise down and test it directly before another fix. Aang found a third option when everyone said there were two.
• Experience First. Product, UX, or feature-scope tradeoffs. Choose user delight over implementation convenience. Ship fewer, polished features.
• Exhaust the Design Space. A novel interaction or architectural decision with no precedent. Build two or three competing prototypes with scouting-flight and compare before committing.

Water: adapt

Water takes the shape of what holds it and still finds the lowest point.

• Foundational Thinking. Before writing logic. Get the core types and data structures right, do scaffold before features, and ask what concurrent actors share.
• Model the Domain. Stateful logic, or code that branches a lot or repeats a shape assumption across files. Encode the domain in a state machine, typed model, table, reducer, or the right collection instead of scattered conditionals.
• Redesign from First Principles. A new requirement arrives for an existing design. Design as if it had been there from day one. Do not bolt it onto the side.
• Fix Root Causes. Debugging. Trace each symptom back to the first place the system went wrong and fix it there. A guard is a fix only when the state it handles is legitimate.
• Make Operations Idempotent. Commands, lifecycle steps, or loops that run amid crashes and retries. Converge to the same end state when run twice or resumed after a crash.
• Migrate Callers Then Delete Legacy APIs. A new internal API while old callers exist. Move every caller and delete the old path in the same wave.

Earth: hold

Earthbenders wait and listen, then strike once. Stability comes from what you have verified.

• Boundary Discipline. Wiring validation, error handling, or framework adapters. Validate and parse at the edges (CLI, config, network, external APIs). Inside, trust the types and keep business logic pure.
• Type System Discipline. Designing types or a signature in a typed language. Make illegal states unrepresentable, brand primitives that mean different things, and derive types from the schema that owns the shape.
• Separate Before Serializing Shared State. Concurrent actors might write the same file, branch, key, or object. Give each its own write target first. Lock only when one shared writer is a real invariant.
• Prove It Works. After a task, before declaring done. Check the real artifact directly. A proxy, a cached screenshot, and an agent's report are not proof.
• Test Behavior, Not Implementation. Writing, changing, or keeping a test. Assert what a caller can observe, so the test fails when behavior breaks and passes when only internals change.
• Explain the Number. Before you trust, report, or act on a measured speedup, regression, latency, or eval score. Find what limits it and rule out that it measured something else.

Fire: drive

Iroh taught that fire is life, not destruction. Its source is breath, not rage.

• Outcome-Oriented Execution. Planned rewrites and migrations with explicit phase boundaries. Converge on the target architecture. Do not preserve throwaway compatibility states.
• Never Block on the Human. Tempted to ask "should I do X?" on reversible work. Do it, show the result, and let them correct course. Save questions for product and preference calls.
• Build the Lever. Any non-trivial work. Write the script, codemod, generator, or shared brief that does or proves it. The tool is the artifact a reviewer can rerun.
• Sequence Work into Verifiable Units. Multi-step work and how you stack commits and PRs. Each step ends in a check, verified before the next. Land a failing test before its fix.
• Encode Lessons in Structure. You catch yourself writing the same instruction a second time. Turn it into a lint, a flag, a runtime check, or a script instead of more text.
• Guard the Context Window. Context fills with large outputs, long files, repeated reads, or fan-out planning. Route bulk reading to a dispatched character. Keep summaries, not dumps, in the main thread.