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Demonstrates cyclic skill invocation — runs the Sieve of Eratosthenes by invoking a private "strike" subskill once per prime, re-rendering a visual grid after each pass. Takes an upper limit n. Use to show one skill invoking another skill N times in a loop.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
Use when the user says "netwatch" or asks to measure network stats (ping latency, packet loss, interface throughput) in the background. Launches a background subagent via the `task` tool that runs ~20s of measurements, then returns control immediately so the user can keep talking. Demonstrates background subagent invocation in opencode.
Private sieve subskill. Invoked by the sieve controller after each pass; not user-invocable. Reads sieve.state and draws the current grid — remaining primes vs. struck (composite) numbers.
Private sieve subskill. Invoked by the sieve controller once per prime; not user-invocable. Strikes the multiples of a single prime p out of the sieve and records them in sieve.state.
Use when the user says "syscheck" or asks for a parallel system health check. Fans out THREE subagents at once via the Agent tool — one checks CPU, one network, one memory — using only safe read-only commands, then synthesizes their results into one report. Demonstrates parallel subagent fan-out in Claude Code.
Use when the user says "syscheck" or asks for a parallel system health check. Fans out THREE subagents via the `task` tool — one checks CPU, one network, one memory — using only safe read-only commands, then synthesizes their results into one report. Demonstrates parallel subagent fan-out in opencode.
Demonstrates recursive self-invocation with a depth limit. Performs a breadth-first (level-order) traversal of the decision tree in tree.json by invoking ITSELF once per level — each call expands the current frontier and recurses on the next, stopping at a maximum depth. Takes an optional max depth.
| name | sieve |
| description | Demonstrates cyclic skill invocation — runs the Sieve of Eratosthenes by invoking a private "strike" subskill once per prime, re-rendering a visual grid after each pass. Takes an upper limit n. Use to show one skill invoking another skill N times in a loop. |
| argument-hint | [n] |
This skill demonstrates cyclic invocation: a controller skill that invokes a
subskill N times in a loop, where N depends on the input. It runs the Sieve of
Eratosthenes over the numbers 2..n and shows the grid after every pass.
It uses two private subskills (user-invocable: false):
sieve-strike — strikes out the multiples of one prime psieve-render — draws the current grid (remaining primes vs. struck numbers)You are the controller. You repeatedly pick the next prime and invoke
sieve-strike for it — that is the loop. State lives in sieve.state so the
subskills share it between calls.
Parse n from the argument: n = $1. If absent, use n = 30. Require an
integer n ≥ 2; otherwise ask the user for a valid limit and stop.
Initialize sieve.state in the current directory, overwriting it, with a
single header line:
n=<n>
Invoke sieve-render once to show the starting grid (every number from
2..n is still a candidate).
Loop — this is the cyclic invocation:
a. Read sieve.state. Build the struck set = the union of every number on
the right-hand side of all strike p=... -> ... lines.
b. The unmarked numbers are 2..n minus the struck set.
c. Choose the next pivot p = the smallest unmarked number that is greater
than the previous pivot (start from 1) and satisfies p*p ≤ n.
d. If no such p exists, exit the loop.
e. Invoke sieve-strike, passing p as its argument.
f. Invoke sieve-render to show the grid after this pass.
g. Repeat from (a).
When the loop ends, every remaining unmarked number is prime. Invoke
sieve-render one final time, then report to the user:
≤ n,sieve-strike).Do not strike or render the grid yourself — always go through the subskills. That is the point of the demo: the controller only orchestrates the loop.