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 rules/prisma/orm/object-hasowngit clone --depth 1 https://github.com/prisma/ormWhat 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 | $0.00000 | $0.00301 |
| Opus 5 | $0.00000 | $0.00151 |
| Sonnet 5 | $0.00000 | $0.00060 |
| Haiku 4.5 | $0.00000 | $0.00030 |
Grade A, and why
object-hasown 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 yesterday.
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- object-hasown — 100% identical, 0 lines differ
What it actually says
Use Object.hasOwn() Instead of hasOwnProperty()
CRITICAL: Always use Object.hasOwn() instead of hasOwnProperty() to check for own properties.
Why?
Object.hasOwn()is the modern, recommended API (ES2022)hasOwnProperty()can be overridden or shadowed- Biome lint rule
noPrototypeBuiltinsenforces this
Examples
❌ WRONG: Using hasOwnProperty()
if (obj.hasOwnProperty('key')) { /* ... */ }
if (meta.annotations?.codecs?.hasOwnProperty('id')) { /* ... */ }
✅ CORRECT: Using Object.hasOwn()
if (Object.hasOwn(obj, 'key')) { /* ... */ }
if (Object.hasOwn(meta.annotations?.codecs ?? {}, 'id')) { /* ... */ }
Note: When using optional chaining, provide a fallback object:
// ❌ WRONG
Object.hasOwn(meta.annotations?.codecs, 'id') // May pass undefined
// ✅ CORRECT
Object.hasOwn(meta.annotations?.codecs ?? {}, 'id')
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.
- yesterday First seen · 39 lines · 0 tokens per session scan A 7c05c8e8f830
object-hasown is a cursor rule published in the GitHub repository prisma/orm (47,579 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 301 tokens. 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.
Other cursor rules, from other repositories
config-validation-and-normalization
Patterns for config validation and normalization using Arktype.
contract-space-package-layout
On-disk layout for packages that expose a contract space (extensions, internal monorepo packages, aggregate-root apps).
cli-package-exports
CLI package export patterns and import conventions.
resolving-cyclic-dependencies
How to resolve cyclic dependencies when moving types or refactoring packages.
no-family-vocabulary-in-framework
The framework domain (packages/1-framework) carries no family- or target-specific vocabulary — types, fields, hooks, or strategy values. Enforced by lint:framework-vocabulary.
review-scope-overrides
Honor explicitly provided base branches in review artifacts.