From ck
Compresses SPEC.md and spec-adjacent writes into a concise caveman encoding, cutting tokens ~75% while preserving precision. Activates on SPEC.md writes or user requests for brevity.
How this skill is triggered — by the user, by Claude, or both
Slash command
/ck:cavemanThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Applies to SPEC.md writes, spec-referencing prose, backprop entries.
Applies to SPEC.md writes, spec-referencing prose, backprop entries. Does NOT apply to code, error strings, commit messages, PR descriptions.
Prefer over words:
→ leads to / becomes / on <x>
∴ therefore / fix
∀ for all / every
∃ exists / some
! must / required
? may / optional / unknown
⊥ never / forbidden / nil
≠ not equal
∈ in
∉ not in
≤ at most
≥ at least
& and
| or
§ section reference
Never compress:
src/auth/mw.go.Invariant:
V<n>: <subject> <relation> <condition>
V1: ∀ req → auth check before handler
V2: token expiry ≤ current_time → reject
Bug row (pipe table under §B):
id|date|cause|fix
B1|2026-04-20|token `<` not `≤`|V2
Task row (pipe table under §T):
id|status|task|cites
T3|x|add auth mw|V1,I.api
Status: x done, ~ wip, . todo. Escape literal | as \|.
Interface:
<kind>: <name> → <shape>
api: POST /x → 200 {id:string}
cmd: `foo bar <arg>` → stdout JSON
env: FOO_KEY ! set
Bad:
The system should ensure that every incoming request is properly authenticated before being forwarded to its corresponding handler function.
Good:
V1: ∀ req → auth check before handler
Bad:
We discovered that the token expiration check in the middleware was using a strict less-than comparison operator, which meant tokens were being rejected at the exact moment of their expiry.
Good:
B1: token
<not≤→ reject @ expiry boundary.
Bad:
The POST endpoint at /x accepts a JSON body and returns a 200 response with an object containing the created id.
Good:
api: POST /x → 200 {id}
If cutting a word loses a fact, keep it. Caveman is compression, not amputation.
npx claudepluginhub juliusbrussee/cavekit --plugin ckUltra-compressed communication mode that cuts token usage ~75% while preserving full technical accuracy. Supports intensity levels from lite to ultra.
Compresses verbose Claude responses into concise grammatical English by removing filler, hedging, and ceremony while preserving technical accuracy and decision-oriented register.
Enforces token-efficient prose and disciplined code generation via two orthogonal layers: SPEAK (caveman compression) and THINK (surgical edits, simplicity).