Tianyi Cui
10ef3d4924
A corpus sweep under the doc/prose standards found 15 links whose #fragment named no anchor in its target — reworded headings, one relocated contract (tool-fs → the group README's no-timeout rule), and zh sides citing English slugs their Chinese headings never produce. Fixed all 15 (zh sides get the conventional explicit <a id> + English fragment), fixed the one generator-owned instance at its source (gen-doc-graphs), and extended verify-md-links to resolve fragments onto Markdown targets — same-file anchors included — against heading slugs and explicit <a id>, so the class is gated instead of manually grepped. Remaining probes (narrated history, duplication shingles, comment transcripts, budgets) came back clean; sibling-adapter README symmetry and implemented-note contrasts are deliberate keeps.
fs/ - filesystem capability family
English | 中文
The filesystem stack: a provider seam (execution-world paths, bounded text IO, and atomic mutation with an optional version guard), a local implementation, a policy gate plugin (observed-state + read-before-edit + version-guarded write/edit), the model-facing file tools + executor, and the bash-backed discovery tools. All product packages.
| Package | Role | ctx key |
|---|---|---|
fs/ |
Provider seam: canonical process paths/file URIs/containment, text IO, and atomic mutation primitives; owns the fs/* policy events |
ctx.fs |
fs-local/ |
Local-filesystem FileSystem implementation |
(registers ctx.fs) |
e2b/fs-e2b |
E2B-backed FileSystem implementation sharing the remote runtime owned by ctx.e2b |
(registers ctx.fs) |
fs-sandbox/ |
Sandbox-enforcing FileSystem: extends fs-local and fences write/edit by the per-call mode + workspace root policy (read-only denies, workspace-write contains to the session workspace + temp roots), reads pass through |
(registers ctx.fs) |
fs-policy/ |
Policy gate plugin: observed-state + read-before-edit + version-guarded write/edit, via the fs/* event gate |
(no service — fs/* listeners) |
tool-fs/ |
Model-facing read/write/edit tools AND the executor (reads via ctx.fs, owns read windowing, dispatches fs/*); preserves filesystem semantics for session-cwd-relative paths and advertises sandbox escalation fields when the mounted ctx.fs confines |
(registers on ctx.tools) |
tool-fs-search/ |
Model-facing glob/grep discovery tools when rg is available on the bash executor PATH, backed by fixed ripgrep commands through ctx.bash, NOT by ctx.fs provider methods |
(registers on ctx.tools) |
The interface lives at fs/fs/. A sandboxed, remote, or project-scoped filesystem backend can replace fs-local without touching the seam, the policy gate, or the model-facing tool schemas: fs-sandbox provides an in-process path fence over the shared sandbox mode (decision), while fs-e2b places file state in the remote execution world shared with the E2B subprocess provider (decision). The policy (fs-policy/) is a plugin that participates only through the fs/* event gate, not a service the tool injects — so dropping it gracefully loses the policy and leaves the unconstrained bare provider rather than breaking the tool. A deployment that loads tool-fs/ is expected to also load it. The mode fence and the read-before-edit gate are orthogonal and compose. Discovery (tool-fs-search/) deliberately does NOT extend the provider seam: search is a process-backed rg workflow on the bash executor, so filesystem backends stay free of a universal search contract; its tools register only when that executor can find rg, and its results are follow-up-readable when the bash workdir and the read root are the same workspace (the co-located deployment its README documents).
No timeouts on file IO
read/write/edit take no timeoutMs, and the provider seam arms no deadline — unlike bash and web (which consume @deepseek-ai/dsh-timeout) and the bash-backed glob/grep (whose declared timeoutMs is enforced by @deepseek-ai/dsh-timeout-policy): those are process-backed, where a deadline can really kill the work. A local syscall is best-effort-abortable at most: a timeout could not force an in-progress fsync/rename to stop, so a deadline here would be a knob that cannot deliver on its promise. Adding one would also be an implicit default in the exact place explicit-over-implicit forbids. Both reference agents (Claude Code, Codex) leave file IO untimed for the same reason; cancellation still propagates through the tool-execution signal for best-effort abort at syscall boundaries.
The subsystem reference — targets, outcomes, guards, policy events, the error taxonomy, and why file IO takes no timeout — is docs/subsystems/filesystem.md; the sandbox fence in the cross-family fs sandbox Agent Note.