# Unguarded invariants

`CLAUDE.md` names these as load-bearing. Nothing enforces either one. A rule
that lives only in prose gets broken by whoever did not read the prose. Both of
these fail silently when broken.

`tokenizerRev` and `preRouteLadder` were checked and need nothing. The rev is
baked into the embedder key, so a bump triggers re-embedding. A missing ladder
rung is observable in the decision record.

## heads_path may equal model_path [#692] {#heads}

Costs: the routing heads then score with the same graph the resident e5-small
uses, and recall degrades. There is no error and no log line, so it reads as
ordinary drift rather than a misconfiguration.
Revisit when: `deploy/mavend.json` is edited by hand, or a fine-tuned heads
graph is swapped in.
Workaround: check the two keys by eye. That is the whole guard today.

## baselineGrammars is mirrored by hand [#693] {#grammars}

Costs: the eval fixture restates the stage 0 rule set in the daemon's order,
and its own comment says so. Three test files score against it. A grammar added
to `buildRouter` alone means every routing measurement scores a set nobody
runs. `CLAUDE.md` warns about this failure by name.
Revisit when: the next stage 0 grammar is added. That is when it bites.
Workaround: add to both lists, which is what the rule already says.