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/generic-parametersgit clone --depth 1 https://github.com/prisma/prisma-nextWhat 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 | $0.00229 |
| Opus 5 | $0.00000 | $0.00114 |
| Sonnet 5 | $0.00000 | $0.00046 |
| Haiku 4.5 | $0.00000 | $0.00023 |
Grade A, and why
generic-parameters 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.
This is a copy
100% identical to generic-parameters — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Generic Parameter Defaults
Rule: Don’t add generic defaults unless the type is meaningfully usable with the default.
Good defaults
Defaults are fine when they represent a real “no-specialization” mode:
interface EventEmitter<T = unknown> {
emit(event: string, data: T): void;
}
Bad defaults
If the type is pointless without concrete generics, defaults create a false “optional” API:
interface ColumnBuilderState<
Name extends string,
Nullable extends boolean,
Type extends string,
> {
readonly name: Name;
readonly nullable: Nullable;
readonly type: Type;
}
Why this matters
- Avoids accidental “too-wide” types (
string,boolean) leaking into core surfaces - Makes intent clear: the generic is required for correctness, not flexibility
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 · 42 lines · 0 tokens per session scan A 8869caee7275
generic-parameters is a cursor rule published in the GitHub repository prisma/prisma-next (421 stars, last pushed 7d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 229 tokens. A static security scan graded it A with 0 findings. It is 100% identical to generic-parameters, differing in 0 lines, and is treated as a copy.
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prefer-direct-imports-over-module-mocks
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control-plane-descriptors
Control plane descriptor and instance implementation patterns.
directory-layout
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family-instance-domain-actions
Family instance domain action implementation patterns.
import-validation
Import validation and package layering rules.