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deepseek-harness/packages/util/README.md
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Yichen Jiang b0a2011d95 docs: bilingual credentials/settings-consumer documentation, catalogs, and gates
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util/ — low-level shared utilities

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Zero-dependency primitives shared across the other groups. A package lands here when it owns a tiny, foundational type or helper that several capability families need but that belongs to none of them — keeping it out of any one group avoids a capability package depending on an unrelated one just to reach a shared primitive. These are support packages: small, stable, and free of harness dependencies.

Package Role
brand/ The type-only Branded<B> nominal-typing primitive (no runtime code, no harness deps)
paths/ Canonical single-root DSH_HOME resolution plus shared filesystem path constants and helpers for harness user data (no harness deps)
timeout/ The timing/classification half of a timeout — clampTimeout/deadline/timeoutOf/TimeoutReason (pure functions, no harness deps); termination stays in each capability
retention/ Bounded model-facing output — ItemRetainer/TextRetainer + neutral notice helpers (pure, no harness deps); business semantics stay in each tool
atomic-write/ Atomic file replacement — writeFileAtomic (exclusive-create temp + rename carrying the caller-stated mode); shared by the settings and credentials stores

dsh-brand is the canonical case: it owns ONLY the Branded<B> helper, so a capability package can brand the ids it owns (dsh-tasks's TaskId, dsh-session's SessionId, …) by depending on dsh-brand alone, without pulling in an unrelated package just to reach Branded.

dsh-paths gives every package the same configurable Harness home without assigning that cross-cutting fact to bash, skills, telemetry, or a composition bundle. It resolves an explicit value before $DSH_HOME, falls back to ~/.dsh, and returns an absolute path without caching, creating, or mutating anything. The harness keeps all user data under one root.

dsh-timeout follows the same shape for the timeout family: dsh-bash and dsh-web-fetch-local each fuse a caller's cancellation with a deadline and later classify "timed out" vs "cancelled" by depending on dsh-timeout alone. It deliberately owns only the timing/classification half — the termination (SIGKILL a process group, tear down a fetch socket) stays in each capability, because no shared layer can own every capability's kill (see the timeout-library Agent Note).

dsh-retention is the same split for bounded tool output: a tool (glob/grep/bash/web_fetch/web_search) feeds items or text into a retainer and gets back what it kept and exactly what it omitted — while grouping, exit codes, provider errors, and recovery prose stay tool-owned. It deliberately owns only the retention mechanic; truncated is a budget fact, never an "incomplete inspection" state (see the retention-library Agent Note).