Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/augchan42/inkstone/analyze-variationnpx skills add augchan42/inkstone --skill analyze-variationgit clone --depth 1 https://github.com/augchan42/inkstoneWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/augchan42/inkstone/analyze-variation)<a href="https://agentmods.dev/skills/augchan42/inkstone/analyze-variation"><img src="https://agentmods.dev/badge/skills/augchan42/inkstone/analyze-variation.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00050 | $0.00896 |
| Opus 5 | $0.00025 | $0.00448 |
| Sonnet 5 | $0.00010 | $0.00179 |
| Haiku 4.5 | $0.00005 | $0.00090 |
Grade A, and why
analyze-variation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Analyze Variation
Reports rhythm (within-post sentence-length variation) and length spread (across a sequence of posts), and flags monotone posts and too-similar neighbors.
Why this is a skill with a script, not a prompt: length and rhythm metrics must be deterministic. The numbers are computed by the bundled Node script — this skill just tells the agent to run it and how to read the output. Do not eyeball the counts; run the script.
When to use
- Before scheduling a batch of social posts, to check the feed won't read as a same-length content machine.
- Reviewing journal/blog drafts or any prose for metronomic cadence.
- Whenever a house style asks to "vary sentence and post length" (the measurement is voice-agnostic; the style rules stay in the project's own voice doc).
How to run
Always execute the bundled script — never compute the metrics yourself.
The script lives at scripts/analyze-variation.mjs inside this skill's own
directory. Resolve that directory however your harness exposes it, then run the
absolute path with Node:
- Claude Code:
$CLAUDE_PLUGIN_ROOT/skills/analyze-variation/scripts/analyze-variation.mjs - opencode / other Agent Skills hosts: use the absolute path to this
SKILL.md's directory +/scripts/analyze-variation.mjs(the env var above is Claude-Code-only).
# pick whichever resolves on your harness; SCRIPT points at the bundled .mjs
SCRIPT="$CLAUDE_PLUGIN_ROOT/skills/analyze-variation/scripts/analyze-variation.mjs"
# one post per file → sequence analysis with neighbor flags
node "$SCRIPT" posts/*.md
# a single post inline or piped
node "$SCRIPT" --text "Short. Then a noticeably longer sentence."
pbpaste | node "$SCRIPT"
# machine-readable, or write a version-tracked report
node "$SCRIPT" posts/*.md --json
REPORT_DATE=2026-06-07 node "$SCRIPT" posts/*.md --write report.md
Markdown frontmatter and JSX/HTML tags are stripped before analysis. The script is CJK-aware (Chinese characters count as tokens; wide chars weighted ×2 for length), so it works for English and mixed CJK copy alike. Dependency-free (Node built-ins).
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 86 lines · 50 tokens per session scan A a66c8f35c65c
analyze-variation is a skill published in the GitHub repository augchan42/inkstone (4 stars, last pushed 9d ago), licensed MIT. It adds 50 tokens to every session and 896 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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