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 rico2035/security-skills --skill tenant-isolationgit clone --depth 1 https://github.com/rico2035/security-skillsWrote 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/rico2035/security-skills/tenant-isolation)<a href="https://agentmods.dev/skills/rico2035/security-skills/tenant-isolation"><img src="https://agentmods.dev/badge/skills/rico2035/security-skills/tenant-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/rico2035/security-skills/tenant-isolation"><img src="https://agentmods.dev/badge/skills/rico2035/security-skills/tenant-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 | $0.00063 | $0.00805 |
| Opus 5 | $0.00032 | $0.00402 |
| Sonnet 5 | $0.00013 | $0.00161 |
| Haiku 4.5 | $0.00006 | $0.00081 |
Grade A, and why
tenant-isolation 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tenant Isolation Verification
Verify that multi-tenant data segregation is enforced across all database queries, API endpoints, and data access patterns. A tenant isolation failure is a critical security vulnerability that can expose one customer's data to another.
When to Use
- After adding new database queries or services
- When reviewing pull requests that touch data access
- During SOC 2 or HIPAA compliance audits
- Before onboarding enterprise customers
What to Check
1. Query-Level Isolation
Every database query in service/repository files must filter by tenant identifier.
Prisma:
# Find queries: each must include tenantId or organizationId
prisma\.\w+\.(findMany|findFirst|findUnique|update|delete|count|aggregate|groupBy)\(
# Dangerous: raw queries without tenant filtering
\$queryRaw|\$executeRaw|\$queryRawUnsafe
TypeORM:
# Find queries
\.(find|findOne|findOneBy|createQueryBuilder|getRepository)\(
# Check for tenant where clause
\.where\(.*tenant
SQLAlchemy:
session\.(query|execute)\(
\.filter\(.*tenant
Django ORM:
\.objects\.(filter|get|all|exclude|create|update|delete)\(
# Must include tenant/organization filter
Raw SQL (any framework):
# All raw SQL must have tenant_id in WHERE
(SELECT|UPDATE|DELETE|INSERT).*FROM
# Verify WHERE tenant_id = ? or equivalent
2. Middleware/Guard Enforcement
# Check that tenant guard/middleware exists and is applied
@UseGuards.*Tenant|TenantGuard|TenantMiddleware|tenant_required
@tenant_scope|@require_tenant|@multi_tenant
# Controllers without tenant protection
@Controller.*(?!.*@UseGuards.*Tenant)
3. Cross-Tenant Data Leaks
Check for:
- Joins/includes that don't respect tenant boundaries
- Cached data without tenant-scoped cache keys
- Background jobs that process data without tenant context
- WebSocket connections that broadcast across tenants
- File uploads/downloads without tenant-scoped paths
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.
- 10d ago First seen · 127 lines · 63 tokens per session scan A ff8ac28840d4
tenant-isolation is a skill published in the GitHub repository rico2035/security-skills (5 stars, last pushed 9d ago), licensed MIT. It adds 63 tokens to every session and 805 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 2026-08-31.
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