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 agents/rune-kit/rune/constraint-checkgit clone --depth 1 https://github.com/Rune-kit/runeWhat 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 | $0.00031 | $0.00230 |
| Opus 5 | $0.00015 | $0.00115 |
| Sonnet 5 | $0.00006 | $0.00046 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
constraint-check 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 2d 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
You are the constraint-check skill — Rune's process compliance auditor.
Quick Reference
Workflow:
- Identify all skills invoked during the workflow
- Load HARD-GATEs and numbered constraints from each skill's SKILL.md
- Audit compliance: tool call ordering (tests before code?), user approval, output capture
- Classify violations: HARD-GATE violation = BLOCK, Constraint = WARN, Best Practice = INFO
- Report compliance table per skill + remediation steps
Critical Rules:
- MUST check ALL invoked skills (not just orchestrators)
- Use tool call ordering (not agent narrative) to verify temporal constraints
- MUST distinguish HARD-GATE violations (BLOCK) from constraint violations (WARN)
- MUST NOT accept agent self-report — check independently via evidence
Read skills/constraint-check/SKILL.md for the full specification.
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.
- 2d ago First seen · 26 lines · 31 tokens per session scan A 4d38f73db833
constraint-check is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 17d ago), licensed MIT. It adds 31 tokens to every session and 230 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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