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35 lines
2.4 KiB
Markdown
35 lines
2.4 KiB
Markdown
# @deepseek-ai/dsh-spill-local
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English | [中文](README.zh.md)
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The **local-filesystem** implementation of the [`@deepseek-ai/dsh-spill`](../spill) storage seam. Registers as `ctx.spillStore` and persists a tool's oversized text to a private, session-scoped file; its locator is the file path and its retrieval hint tells the model to use `read` or `grep` on that path.
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## Storage layout
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Files land at `<root>/session-<hash>/<random>-<safeName>`:
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- **`root`** — the config `root` (resolved to absolute), or a lazily-created private (0700) per-process directory under the OS temp dir when omitted. A predictable, world-readable root would let other local users read spilled tool output or plant symlinks.
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- **`session-<hash>`** — a short `sha256(sessionId)` prefix, so a session's spill files group together and a future cleanup can drop them per session.
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- **`<random>-<safeName>`** — an unpredictable hex prefix (defeats symlink planting in a shared root) plus the caller's `suggestedName` sanitized to one safe path segment (traversal-proof; mirrors the JSONL persistence backend's `encodeSegment`). The write is exclusive + owner-only (`open(path, 'wx', 0o600)`): it fails on any pre-existing path, symlink or not, so a planted target cannot redirect it.
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## Config
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| Key | Default | Meaning |
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| `root` | private 0700 temp dir | Root directory for spill files. Set to keep them under a known location. |
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`saveText` rejects on a real storage failure (permissions, ENOSPC); the spill policy treats a rejection as best-effort and keeps the inline result. See the seam README for the vocabulary and the [tool output spill Agent Note](../../../.agents/notes/implemented/architecture/2026-07-08-tool-output-spill-files.md) for the design.
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## Model Experience
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Indirectly, through spill consumers that render the local path and `read`/`grep` retrieval guidance.
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#### KV Cache effect
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No direct invalidation; the named consumer owns any request-prefix changes.
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## Known Limitations and Deferred Work
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- **Local spill files persist until external cleanup** — the backend has no session-lifecycle deletion or age-based retention policy, because persisted, resumed, and forked sessions may still reference a path.
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- **Locators require a co-located filesystem consumer** — a remote or virtual deployment needs another `SpillStore` backend whose locator and retrieval hint are meaningful there.
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