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FirstPrinciples

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Physics-based reasoning framework (Musk methodology) that deconstructs a problem to irreducible fundamental truths, classifies every element as hard constraint, soft constraint, or assumption, then reconstructs the optimal solution from fundamentals alone. USE WHEN first principles, fundamental truths, challenge assumptions, real constraint, rebuild from scratch, start over, physics first, question everything, reasoning by analogy. NOT FOR structural feedback loops (use SystemsThinking).

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# FirstPrinciples

**Contents:** Ideal State · Intent Routing · Constraint Classification · The Core Distinction · The Load-Bearing Rules · Output Format · Data & Config · Gotchas · Examples

Breaks a problem down to its fundamental truths and rebuilds the solution from there, instead of copying what already exists. Three steps, each an intent: DECONSTRUCT (break it into constituent parts and real values), CHALLENGE (classify every element as hard constraint, soft constraint, or unvalidated assumption; only physics is truly immutable), and RECONSTRUCT (build the optimal solution from the fundamentals alone). Outputs a parts breakdown, a constraint table, and a reconstructed solution. It is analysis, not implementation: a request to fix something is done directly, not through this skill. Other skills call it when inherited assumptions may be limiting the solution space: architecture work asking "constraint or convention?", RedTeam and pentests attacking assumed boundaries, RedTeam building counter-proposals with Reconstruct, and engineering escaping a local maximum.

## Ideal State

- What the analysis calls fundamental is only physics, math, verified fact or a truly immutable requirement; every market price, best practice and policy is shown to be convention and taken apart.
- The irreducible function of the subject is stated as an outcome, not a mechanism ("pick the right model and effort for a piece of work", not "a router"), and every component under discussion is marked as serving that function or not. Costing from fundamentals appears only when cost is part of the question.
- Output length matches the request: an inline, brief or terse pass returns the irreducible job, the classification with its evidence, and the key insight in a few lines, without empty template sections; the full templates are for full runs.
- A full run ends with a solution rebuilt from the hard constraints and compared against the current approach, plus the one assumption that was limiting it.

## Intent Routing
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