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harness-tools/extensions/native-hooks/skills/native-hook-authoring/references/contracts.md
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# Policy contracts
The authoritative declarations are exported by `@jbcode/pi-native-hooks/policy` from `src/policy.ts`. Do not copy them into personal config.
A diagnostic policy declares `kind`, a unique `id`, analyzer keys, `appliesTo`, and a pure `evaluate`. `evaluate` receives readonly normalized snapshots and a process-free policy context. Filter findings by exact rule ID and return bounded guidance plus the supported suppression form.
A verification policy declares a project matcher and exact requirements. Each requirement owns an exact command, `cwd: "project-root"`, and a pure `affects(path)` predicate. Do not infer scripts or accept command variants.
Use:
```ts
import type { DiagnosticPolicy } from "@jbcode/pi-native-hooks/policy";
export default { /* ... */ } satisfies DiagnosticPolicy;
```
No runtime import is needed. Enums, namespaces, parameter properties, JSX, and tsconfig transforms are unsupported in personal modules.