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/prisma-next/typescript-patternsgit clone --depth 1 https://github.com/prisma/prisma-nextWrote 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/rules/prisma/prisma-next/typescript-patterns)<a href="https://agentmods.dev/rules/prisma/prisma-next/typescript-patterns"><img src="https://agentmods.dev/badge/rules/prisma/prisma-next/typescript-patterns.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.00308 |
| Opus 5 | $0.00000 | $0.00154 |
| Sonnet 5 | $0.00000 | $0.00062 |
| Haiku 4.5 | $0.00000 | $0.00031 |
Grade A, and why
typescript-patterns 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.
What it actually says
TypeScript and Architecture Patterns
This rulecard is intentionally short. For deeper examples, see docs/reference/typescript-patterns.md.
Focused rulecards
.cursor/rules/generic-parameters.mdc— Generic parameter defaults.cursor/rules/interface-factory-pattern.mdc— Interface-based design + factory functions.cursor/rules/type-predicates.mdc— Replace blind casts with type predicates.cursor/rules/test-mocking-patterns.mdc— Type assertions and mocking patterns in tests
Quick reminders
- No blind casts in production:
as unknown as Xis forbidden outside tests. Prefer type predicates or fix the type surface. - Export interfaces; construct via factories: keep classes as private implementation details.
- No generic defaults unless meaningful: defaults are semantics, not “flexibility”.
- Test-only escapes:
@ts-expect-errorand double casts are acceptable only in test files, with a short explanation.
Related rules
.cursor/rules/no-inline-imports.mdc.cursor/rules/object-hasown.mdc.cursor/rules/prefer-assertions-over-defensive-checks.mdc
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 · 30 lines · 0 tokens per session scan A 4ece26c1b621
typescript-patterns is a cursor rule published in the GitHub repository prisma/prisma-next (419 stars, last pushed 10d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 308 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 2026-09-03.
Other cursor rules, from other repositories
sql-types-imports
Canonical import paths for SQL types.
use-ast-factories
Use factory functions for creating AST nodes instead of manual object creation.
type-extraction-from-contract
Extract TypeScript types from contract.d.ts and helpers.
required-key-undefined-fields
Internal input types use required keys typed | undefined, not optional keys.
type-predicates
Replace blind casts with type predicates (type guards).
use-if-defined
Use ifDefined() for conditional object spreads.