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Nine billion dollars from four companies for a title Palantir coined for its lowest-status engineers. The mechanism behind the comeback, and what the copycats will get wrong.

The deliverables named in real postings, the pod structure, sourced pay, and the three questions that reveal whether an FDE role is real or a retitled solutions engineer.

Euler deleted detail until only structure remained. That is still the whole job. Two interactive figures: walk the Konigsberg bridges, run the 107-agent research DAG.

Harness Anatomy 1 of 4. Session trees, a twenty-line system prompt, no pruning, and cache misses itemized in dollars.

Harness Anatomy 2 of 4. Layers ordered by change frequency, CLAUDE.md as a user message, cache preservation as architecture.

Harness Anatomy 3 of 4. Four compaction paths, a model trained on summary placement, and the sealed-state price. Two settings tripled ARC-AGI-3.

Harness Anatomy 4 of 4. A harness that is also your shell, checkpoint time travel, 128-agent swarms, mandatory preserved thinking.

Every generated token reads the model's weights from memory once. Divide bandwidth by weight bytes and you can predict your speed before the download finishes.

A new genre of technical writing: documents addressed to machines, in shouted imperative English, where every rule is a scar.

A backend is workers, triggers, and functions, and an agent is just another worker. Once the harness is the backend, reliability becomes durable execution.

Harness engineering, context engineering, loop engineering. Most of the new vocabulary renames fundamentals we have had for decades.

Every readability rule was always for the next human. A second reader arrived, and it audits how much of that advice you followed.

Emitting an event after a commit without an outbox is a lossy notifier. The fix is the outbox pattern or real change data capture.

Agents build the wrong thing, ship duplicates, reinvent what you have. The fix is a system the agent is part of.

Hold the model fixed and engineer the environment: context, tools, the loop, and proof.

The skills in order, two routes in, and one free curriculum that builds the whole stack from scratch.