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 Sounio-lang/sounio --skill sounio-l0-coregit clone --depth 1 https://github.com/Sounio-lang/sounioWrote 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/sounio-lang/sounio/sounio-l0-core)<a href="https://agentmods.dev/skills/sounio-lang/sounio/sounio-l0-core"><img src="https://agentmods.dev/badge/skills/sounio-lang/sounio/sounio-l0-core/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/sounio-lang/sounio/sounio-l0-core"><img src="https://agentmods.dev/badge/skills/sounio-lang/sounio/sounio-l0-core.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 | $0.00040 | $0.00279 |
| Opus 5.5 | $0.00016 | $0.00112 |
| Sonnet 5.5 | $0.00008 | $0.00056 |
| Haiku 4.5 | $0.00004 | $0.00028 |
Grade A, and why
sounio-l0-core 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 1mo 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
Sounio L0 Core
Workflow
- Anchor on language identity
- Read
docs/implementation/MV_CORE_CHECKLIST.mdfirst. - Confirm: explicit effects, epistemic integrity, and Sounio-native syntax.
- Epistemic invariants
- Use
stdlib/epistemic/SEMANTICS.mdfor Knowledge/uncertainty/confidence/provenance rules. - Never allow implicit Knowledge→T unwrapping.
- Effects and purity
- Consult
.claude/commands/sounio-effects.mdfor effect expectations. - Ensure side effects are declared on functions (
with IO,with Panic, etc.).
- Units and refinements (when relevant)
- Use
.claude/commands/sounio-units.mdto keep unit syntax and checks consistent.
References
docs/implementation/MV_CORE_CHECKLIST.mdstdlib/epistemic/SEMANTICS.mddocs/spec/LANGUAGE_SPECIFICATION.md.claude/commands/sounio-effects.md.claude/commands/sounio-units.md
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.
- 1mo ago Changed 5bdeb0012a0c
- 1mo ago First seen · 31 lines · 40 tokens per session scan A 4b0818ae5521
sounio-l0-core is a skill published in the GitHub repository Sounio-lang/sounio (12 stars, last pushed today), licensed Apache-2.0. It adds 40 tokens to every session and 279 once invoked, about $0.0002 per session on Opus 5.5. 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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