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/no-bare-castsgit 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 | $0.00848 |
| Opus 5 | $0.00000 | $0.00424 |
| Sonnet 5 | $0.00000 | $0.00170 |
| Haiku 4.5 | $0.00000 | $0.00085 |
Grade A, and why
no-bare-casts 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 2d 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.
This is a copy
92% identical to no-bare-casts — 6 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.
How it starts
The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
No bare as casts in production TypeScript
Bare as type casts (value as Foo, x as unknown as Bar) are forbidden in production code. The no-bare-cast Biome plugin (TML-2685) fires on every bare as token in production files. The CI ratchet rejects per-PR cast-count increases. Every bare cast must be replaced by one of the three accepted forms or eliminated by a code rewrite.
Three accepted forms
| Form | When to use |
|---|---|
blindCast<T, "Reason">(value) |
The value is genuinely opaque or unrelated to the target type. The Reason literal documents the compromise at the call site. |
castAs<T>(value) |
The value already satisfies T; the assertion is purely declarative (widening from a subtype, or providing an annotation the type-checker cannot infer). |
as const |
A different semantic — produces a readonly literal type, not a type assertion. Always fine; the rule does not fire on as const. |
Both helpers live in @prisma-next/utils/casts:
import { blindCast, castAs } from '@prisma-next/utils/casts';
Rewrite first; cast as last resort; reviewer validates the justification
When an author reaches for blindCast, the first action is to ask whether the code can be rewritten so the cast becomes unnecessary. Only when no rewrite is feasible does the cast happen, and the Reason literal must articulate the compromise in language a reviewer can evaluate. An unconvincing Reason is the reviewer's signal to push back — and the author's signal to go solve the underlying type-system problem properly. blindCast is not a sanctioned tool to reach for; it is the auditable escape hatch when everything else has been tried.
Rewrite options to exhaust before reaching for blindCast:
- Tighten an input type so the cast becomes unnecessary.
- Add a runtime check that narrows via a type predicate (
if (isUser(x)) { … }). - Restructure a generic so the bound carries the needed information.
- Use
satisfieswhen the goal is type-checking without coercion —expr satisfies Tis unaffected by this rule. - Use
castAs<T>(value)when the value already satisfies the target type.
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.
- 2d ago First seen · 58 lines · 0 tokens per session scan A 8c18b376223d
no-bare-casts is a cursor rule published in the GitHub repository prisma/prisma-next (420 stars, last pushed 7d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 848 tokens. A static security scan graded it A with 0 findings. It is 92% identical to no-bare-casts, differing in 6 lines, and is treated as a copy.
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