Domain Knowledge Layer for Physics Domain Knowledge Layer for Physics | Zhiwei Li

Domain Knowledge Layer for Physics | Generated by AI

Home 2026.05

skills.py is the domain knowledge layer that the FSM/Tree of Thoughts engine calls during reasoning.

Why it exists

The FSM handles search control (expanding nodes, scoring, pruning) but knows nothing about physics. skills.py fills that gap:

FSM does skills.py does
State transitions, tree search Physics computations (Maxwell, Lagrangian, QM, etc.)
Decides which branch to explore tot_hard_rule_check — vetoes physically invalid nodes
Manages reasoning stages tot_stage_prompt_contract — injects stage-specific prompt constraints
Loads domain config tot_domain_plugin_bundle — provides domain plugin data

Key call sites:

  • fsm/builder.py:1050 — calls tot_hard_rule_check during the calculation stage; if equations violate physics rules, that node is vetoed
  • fsm/backend.py:111 — loads the domain plugin bundle
  • fsm/backend.py:130 — fetches the prompt contract for the current reasoning stage

In short: the FSM is the search framework; skills.py is the physics “rule judge + calculator.” Together they enable constrained, physics-aware reasoning.

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