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/obneyai/grain/event-model-propagatenpx skills add ObneyAI/grain --skill event-model-propagategit clone --depth 1 https://github.com/ObneyAI/grainWrote 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/obneyai/grain/event-model-propagate)<a href="https://agentmods.dev/skills/obneyai/grain/event-model-propagate"><img src="https://agentmods.dev/badge/skills/obneyai/grain/event-model-propagate.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 5.1 | $0.00060 | $0.00191 |
| Opus 5 | $0.00030 | $0.00096 |
| Sonnet 5 | $0.00012 | $0.00038 |
| Haiku 4.5 | $0.00006 | $0.00019 |
Grade A, and why
event-model-propagate 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.
What it actually says
Event Model Propagate
Use Allium propagate for behavioural integration, property, and state-machine
tests. Event Model propagation adds only structural contracts:
- Assert the registered model passes
verify-event-model!in the fully loaded app. - Assert
verify-or-throw!rejects representative incomplete or drifted models. - Assert
validate-spec-compositionpasses from the repository root. - Cover new validator rules or trace failure modes when the schema changes.
Do not create command behavior tests from Event Model. Confirm new structural tests fail for the intended missing topology before implementing the correction.
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 · 19 lines · 60 tokens per session scan A 41143b1e47a3
event-model-propagate is a skill published in the GitHub repository ObneyAI/grain (118 stars, last pushed 2d ago), licensed MIT. It adds 60 tokens to every session and 191 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 2026-08-30.
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