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 skills add mpsuesser/pi-effect-harness --skill effect-wide-eventsgit clone --depth 1 https://github.com/mpsuesser/pi-effect-harnessWrote 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/mpsuesser/pi-effect-harness/effect-wide-events)<a href="https://agentmods.dev/skills/mpsuesser/pi-effect-harness/effect-wide-events"><img src="https://agentmods.dev/badge/skills/mpsuesser/pi-effect-harness/effect-wide-events/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mpsuesser/pi-effect-harness/effect-wide-events"><img src="https://agentmods.dev/badge/skills/mpsuesser/pi-effect-harness/effect-wide-events.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00036 | $0.00694 |
| Opus 5 | $0.00018 | $0.00347 |
| Sonnet 5 | $0.00007 | $0.00139 |
| Haiku 4.5 | $0.00004 | $0.00069 |
Grade A, and why
effect-wide-events 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 11d 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.
What it actually says
optimize(querying) ∧ ¬optimize(writing)
annotate(span, context) where context = { business ∪ user ∪ technical ∪ outcome }
effect-api := Effect.annotateCurrentSpan ∨ Effect.annotateLogs queryable-via := annotations ⊄ log-message-args // extra log-message args → message body, not auto-indexed dimensions
high-dimensionality → better-queryability high-cardinality(userId) → acceptable
∀ span → attach(identity ∪ user ∪ business ∪ performance ∪ outcome)
¬queryable → ¬enough-context
Reference: See Article.md for full article by Boris Tane (loggingsucks.com)
What ships with it
1 file 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.
- 11d ago First seen · 91 lines · 36 tokens per session scan A 1b08d09309bf
effect-wide-events is a skill published in the GitHub repository mpsuesser/pi-effect-harness (24 stars, last pushed 3mo ago), licensed MIT. It adds 36 tokens to every session and 694 once invoked, about $0.0002 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 2026-08-30.
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