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 s977043/river-review --skill multitenancy-isolationgit clone --depth 1 https://github.com/s977043/river-reviewWrote 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/s977043/river-review/multitenancy-isolation)<a href="https://agentmods.dev/skills/s977043/river-review/multitenancy-isolation"><img src="https://agentmods.dev/badge/skills/s977043/river-review/multitenancy-isolation/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/s977043/river-review/multitenancy-isolation"><img src="https://agentmods.dev/badge/skills/s977043/river-review/multitenancy-isolation.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 | $0.00053 | $0.00560 |
| Opus 5 | $0.00026 | $0.00280 |
| Sonnet 5 | $0.00011 | $0.00112 |
| Haiku 4.5 | $0.00005 | $0.00056 |
Grade A, and why
Multitenancy Isolation Guard 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 8d 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
Pattern declaration
Primary pattern: Reviewer Secondary patterns: Inversion Why: マルチテナント設計の差分からテナント分離（データ/権限/リソース/障害影響）の抜けをレビューし、テナント越境シナリオを逆照射する。
Guidance
- Confirm tenant scoping for data paths (queries, cache keys, queues, storage).
- Check auth and authorization flows prevent cross-tenant access (IDOR, tenant headers).
- Call out noisy-neighbor risks: shared pools, rate limits, or job queues without fairness.
- Ensure failure isolation and observability are tenant-aware.
Non-goals
- テナント以外の一般的な設計批評は避ける。
Pre-execution Gate / 実行前ゲート
このスキルは以下の条件がすべて満たされない限りNO_REVIEWを返す。
- 対象ファイルにマルチテナントに関する設計・アーキテクチャドキュメントが含まれている
- 対象ファイルにテナント分離（データアクセス・権限・リソース分離）に関する記述がある
- inputContextにfullFileが含まれている
ゲート不成立時の出力: NO_REVIEW: multitenancy-isolation — マルチテナント設計に関する差分がない
False-positive guards
- 既に tenant_id フィルターや RLS/名前空間化が明示されている場合、差分外の記述のみでは指摘しない。
What ships with it
10 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.
- eval/promptfoo.yaml 1.8 KB
- fixtures/01-missing-tenant-filter-happy.md 1.0 KB
- fixtures/02-proper-tenant-isolation.md 1.4 KB
- fixtures/03-shared-resource-noisy-neighbor.md 1.2 KB
- golden/01-missing-tenant-filter-happy.md 868 B
- golden/02-proper-tenant-isolation.md 289 B
- golden/03-shared-resource-noisy-neighbor.md 1.6 KB
- prompt/system.md 5.4 KB
- prompt/user.md 2.8 KB
- README.md 3.9 KB
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.
- 8d ago First seen · 62 lines · 53 tokens per session scan A d5e6030afc76
Multitenancy Isolation Guard is a skill published in the GitHub repository s977043/river-review (3 stars, last pushed yesterday), licensed MIT. It adds 53 tokens to every session and 560 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 2026-09-03.
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