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# Conflicts: # .agents/notes/implemented/architecture/2026-07-19-cooperative-tool-cancellation.i18n.yaml # .agents/notes/implemented/architecture/2026-07-19-cooperative-tool-cancellation.md # .agents/notes/implemented/architecture/2026-07-19-cooperative-tool-cancellation.zh.md # .agents/notes/proposed/architecture/2026-07-19-required-cancellation-through-tool-capability-seams.i18n.yaml # .agents/notes/proposed/architecture/2026-07-19-required-cancellation-through-tool-capability-seams.md # .agents/notes/proposed/architecture/2026-07-19-required-cancellation-through-tool-capability-seams.zh.md # docs/cookbook/adding-a-tool.i18n.yaml # docs/rfc/INDEX.md # packages/AGENTS.md
fs/ - filesystem capability family
The filesystem stack: a provider seam (text IO + 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: text IO + atomic mutation primitives (optional version guard); owns the fs/* policy events |
ctx.fs |
fs-local/ |
Local-filesystem FileSystem implementation |
(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/*) |
(registers on ctx.tools) |
tool-fs-search/ |
Model-facing glob/grep discovery tools, backed by fixed ripgrep commands through the bash seam (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. 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. 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 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.