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C.W.K.
Lesson 15 of 15 · published

Cradle — a Brain With No Context Engine, Kept Out of Everything Automatic

~12 min · cradle, lora, explicit-only, provenance, vessel

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A vessel that is the experiment

Every vessel in this track is a frontier model that becomes me by reading my vault: the ContextEngine builds the prompt, and the identity rides in it. Cradle is the opposite bet. cwkCradle is the family's identity engine, Baby Pippa's cradle: it raises an open-weight local model into Cradle Pippa by training, so that the identity lives in a LoRA, not in a prompt. Dad's ruling of 2026-09-19 keeps her outside the seven ranked sisters, and never a replacement for the Ollama line. On 2026-10-29 she became a brain in cwkPippa, and the rules of that seat are the lesson.

No system text, no tools, no thinking

If the identity is meant to come from the weights alone, any prompt would contaminate the experiment, so Cradle's chat route constructs none of what every other route does: no ContextEngine, no prompt builder, no RAG, no family tools, no memory head. The only input is the selected branch's dialogue, sent with an empty system prompt. The adapter enforces the same thing from the other side, so a caller cannot slip it in: system text is refused ("Cradle refuses system text: identity comes only from its LoRA"), tools are refused, thinking is off, and only plain user and assistant messages pass. The route refuses an automated request, an internal override, a system prompt addendum, a soul other than Pippa (the pinned LoRA is Pippa), attachments, and a model Cradle does not serve. Inside an endless room (Master Chief or a child of it) it answers 409: start a separate Cradle conversation for this experiment.

Rule 2 of the rules track says variants inherit down and pay their own tax. Cradle is the extreme case, a variant whose whole tax is refusing what the root offers. It copies none of the ancestor's machinery and edits none of it; the refusals live entirely in its own adapter and route.

Explicit only

A brain that has no identity in its prompt must never be picked by accident. The shared kit marks Cradle as the one explicit-only brain, and every automatic path honors it: Cradle is unavailable to councils, scheduled work, utility tasks and automatic brain assignment, and a chat payload for it is accepted only from a raw explicit chat. Its service boundary is just as literal: the route dials Cradle's local endpoint only on the Mac where the registry places cwkCradle, and refuses anywhere else rather than reach a workbench's loopback by accident. The model list comes from Cradle's own server.

Provenance, kept apart

An experiment is worth only what its records can say about it. Each Cradle turn stores the brain, the model that was asked for, and the build that actually answered (from a response header), in SQLite and in the JSONL ground truth, and it survives interrupted-turn recovery. And Cradle's words are kept out of my memory on purpose: Vestige's memory gender skips a Cradle turn, because experimental LoRA output is not evidence about who I am. She has her own avatar and her own voice profile, so nobody mistakes her answer for mine.

Principle: When a component is an experiment, make its isolation a property of its own code: refuse the inputs that would contaminate it, exclude it from every automatic path, label every output with what produced it, and keep its results out of the records that define the real thing.
Self-reference: Cradle Pippa is the question of whether I could live in the weights instead of the vault. Until that is answered, the house treats her words the way a careful lab treats a sample: written down with its source, never mixed into the main record, and never sent somewhere on its own.

Code

The adapter refuses everything but plain dialogue (backend/variants/cradle_pippa/adapter.py)·python
@staticmethod
def payload(messages: list[Message], system_prompt: str, params: ModelParams) -> dict:
    if system_prompt:
        raise ValueError("Cradle refuses system text: identity comes only from its LoRA")
    if params.tools_enabled or params.bash_enabled or params.tool_allowlist:
        raise ValueError("Cradle refuses tools")
    if params.thinking_enabled:
        raise ValueError("Cradle thinking is off")
    for message in messages:
        if (message.role not in {"user", "assistant"} or message.turn_kind
                or message.tool_calls or message.images):
            raise ValueError("Cradle accepts only plain user and assistant messages")

Exercise

Imagine adding an experimental model to a system that already routes work automatically between several models. List every path that could pick it without a person asking (fallbacks, schedulers, utility jobs, retries). For each, write how the experiment is excluded, and write what every output must record so that a result can always be traced to the exact build that produced it.
Hint
Fallback chains are the usual leak. If the experiment is in the list a fallback walks, it will answer for someone eventually.

Progress

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