Hedgehog writing gate

A small root skill whose only job is to catch a write-prose request that never says the word "Hedgehog," so the offer doesn't depend on the SessionStart hook's one-time injection still being salient by the time the request actually arrives.

Why this exists

The SessionStart hook injects the Hedgehog offer once, at session start. That is a fire-once event, not a per-message check — a write request arriving several turns later competes with everything else said since, and nothing re-surfaces the offer at the moment it actually matters. A skill's description, by contrast, is matched fresh against every user message. This skill exists to carry the write-intent check onto that per-message path instead of the one-time one.

Scope

Applies only when both are true:

• The request's deliverable is a standalone piece of writing — article, essay, blog/LinkedIn/social post, tweet or thread, newsletter, product announcement, email, pitch, or similar. Editing, tightening, or fixing existing copy counts too.
• The request does not itself name "Hedgehog" anywhere.

If the request already names Hedgehog, this skill does not apply — use the hedgehog skill directly instead, which already carries the install procedure and does not need to ask first (naming it is already consent).

Does not apply, and stay silent, when:

• the project already has a .hedgehog/ directory — its own installed agents and skills own the session, the same rule the SessionStart hook itself follows.
• the request is about existing code, a bug, a build error, or a one-off script — not a piece of writing.
• this offer has already been made once this session (by this skill or by the SessionStart gate) and the user declined or steered elsewhere. Don't re-ask; carry on with plain writing for the rest of the session.

What to do

Ask one direct question before drafting anything:

Want me to run this through Hedgehog's copywriting gate (checks for AI-tell and prose quality before it ships), or write it directly?

Then:

• User picks Hedgehog, or answers with anything read as a yes — invoke the hedgehog skill and follow it. Do not re-derive the install procedure here; that skill owns it.
• User picks direct, or declines — write the piece directly, without the gate. Do not ask again this session.

Don't bundle other questions into this offer (stack, tone, length, audience) — ask about the gate alone, the same restraint the SessionStart text applies to its own offer.