La Lettre Portal
LA LETTRE
The Engine — Controlled Generative Drama Engine

Generativity held in check by authorial constraints.

A large language model can improvise a conversation. It cannot sustain a dramaturgy. The Engine gives the AI strong local freedom while maintaining a measurable fidelity to intent.

Four layers of freedom

The closer an element is to the dramatic core, the less freedom the AI has. Generativity operates at the periphery.

AI freedom 0

Immutable canon

Facts, thresholds, transformations, final line.

AI freedom 0–1

Dramatic state

The eight variables, the relational memory.

AI freedom 2–3

Generative performance

Dialogue, micro-gestures, timing, local incidents.

AI freedom 4

Peripheral world

Atmosphere, crowd, rendering, texture, light.

The AI freedom scale (0 → 4)

LevelFreedom granted to the AI
0No freedom: authorial point.
1Highly constrained wording.
2Wording + micro-gestures.
3Local strategies and limited incidents.
4Strong local generation — without changing the threshold or the transformation.

Character Constitution

The system knows not only what a character can say, but what they would almost never say. Dialogue varies widely without the character drifting.

The authorial points (choke points)

The meaning of M07, the requirement of a costly action in M08, the final line of M10: the system enacts the moment; it does not invent its meaning.

Shown, never handed over. The Engine is a protected asset: it can be demonstrated, but its full specification does not circulate. Only a fixed summary is shared, under agreement.