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-compiler-mirgit 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-compiler-mir)<a href="https://agentmods.dev/skills/sounio-lang/sounio/sounio-compiler-mir"><img src="https://agentmods.dev/badge/skills/sounio-lang/sounio/sounio-compiler-mir/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-compiler-mir"><img src="https://agentmods.dev/badge/skills/sounio-lang/sounio/sounio-compiler-mir.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 | $0.00051 | $0.00320 |
| Opus 5.5 | $0.00020 | $0.00128 |
| Sonnet 5.5 | $0.00010 | $0.00064 |
| Haiku 4.5 | $0.00005 | $0.00032 |
Grade A, and why
sounio-compiler-mir 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 Compiler MIR
Overview
Make safe, SSA-aware performance improvements in MIR without breaking semantics.
Workflow
1) Orient in the MIR stack
- Read
docs/MIR_OPTIMIZATION_STRATEGY.mdfor the intended pass roadmap. - Use
references/mir-navigation.mdto jump to the right module quickly.
2) When editing an existing pass (e.g., CSE)
- Confirm effect/purity assumptions:
- Treat
Call/CallIndirectas effectful unless proven pure. - Treat
Loadas unsafe for CSE without alias info (current CSE is conservative).
- Treat
- Preserve SSA invariants (or mark
preserves_ssa()false and re-establish SSA).
3) When adding a new MIR pass
- Implement the pass under
compiler/src/mir/optimization/. - Export it in
compiler/src/mir/optimization/mod.rs. - Register it in
compiler/src/mir/optimization/pass_manager.rsif it’s in the default pipeline. - Add focused unit tests close to the pass (see existing pass tests).
References
- MIR map + entry points:
references/mir-navigation.md - New-pass checklist:
references/pass-checklist.md
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.
- 1mo ago First seen · 37 lines · 51 tokens per session scan A f7f6a5eb68e0
sounio-compiler-mir is a skill published in the GitHub repository Sounio-lang/sounio (12 stars, last pushed today), licensed Apache-2.0. It adds 51 tokens to every session and 320 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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