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+---
+name: isv-slot-scaffolder
+description: Scaffolds new ISV slots — generates crates/.../spN_isv_slots.rs with named constants in [START..END), bumps ISV_TOTAL_DIM at canonical location, registers slots for fold-boundary reset, emits the canonical commit message shape. Use when adding ISV-driven adaptive bounds for a new SP.
+---
+
+# Foxhunt ISV Slot Scaffolder
+
+Templatizes the ISV-slot scaffolding step that runs early in every SP that introduces adaptive bounds.
+
+## When to invoke
+
+- "Add ISV slots for SP-N".
+- "Scaffold spN_isv_slots.rs".
+
+## Reference: canonical example
+
+The most recent example is commit `c146c4fff`:
+
+```
+feat(sp15): scaffold sp15_isv_slots.rs with 46 slots [397..443) — ISV_TOTAL_DIM 396→443
+```
+
+Reproduce that shape exactly. The plan must:
+
+1. Discover the current `ISV_TOTAL_DIM` value (grep for `ISV_TOTAL_DIM` in `crates/`).
+2. Discover the next free index (= current `ISV_TOTAL_DIM`).
+3. Receive a list of `(SLOT_NAME, purpose)` from the user.
+4. Compute the new range `[START..END)` and new `ISV_TOTAL_DIM`.
+
+## Inputs you must collect first
+
+1. SP number (N).
+2. List of slot names + purposes. Names are `SCREAMING_SNAKE_CASE`.
+3. Optional: explicit indices (else assigned sequentially from current `ISV_TOTAL_DIM`).
+
+## What this skill produces
+
+1. New file `crates/<crate>/src/isv/sp<N>_isv_slots.rs`:
+
+```rust
+//! SP-<N> ISV slots — [<START>..<END>)
+//!
+//! Adaptive bounds and signals for SP-<N>.
+//! Source pearl: <link to spec §5>.
+
+pub const ISV_<NAME_1>: usize = <S>;
+pub const ISV_<NAME_2>: usize = <S>+1;
+// ...
+
+pub const SP<N>_SLOTS_START: usize = <S>;
+pub const SP<N>_SLOTS_END: usize = <E>;
+```
+
+2. Edit at canonical `ISV_TOTAL_DIM` site:
+
+```rust
+pub const ISV_TOTAL_DIM: usize = <NEW>;  // bumped from <OLD> by SP-<N> (+<K> slots)
+```
+
+3. Edit at fold-boundary reset registration site to register `SP<N>_SLOTS_START..SP<N>_SLOTS_END`.
+
+4. Suggested commit message (use heredoc):
+
+```
+feat(sp<N>): scaffold sp<N>_isv_slots.rs with <K> slots [<S>..<E>) — ISV_TOTAL_DIM <OLD>→<NEW>
+```
+
+## Discipline
+
+- All slots must be referenced by at least one consumer in a follow-up commit (per `feedback_wire_everything_up.md`).
+- Slot names must be domain-meaningful — no `SP15_X1`, `SP15_X2` placeholders.
+- ISV_TOTAL_DIM bump must match the slot count exactly. Verify before committing.
+
+## After scaffolding
+
+Suggest invoking `foxhunt-isv-discipline-auditor` to verify the new slots aren't shadowing existing ones with semantically-similar purposes.