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refactor(fs): split filesystem seam into provider ctx.fs + policy ctx.fileContext

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Implements the split-the-filesystem-seam RFC. ctx.fs shrinks to a text-storage
provider seam (resolve/stat/readText/streamText/writeText/editText with branded
FsTargetKey/FsVersion and an explicit FsWriteExpectation); the new
dsh-file-context package owns the model-facing policy (read windowing,
observed-state, write/edit freshness) as the concrete ctx.fileContext service.

Authorization is now freshness-based rather than full/partial view: a windowed
read records the file version and authorizes a later edit when the file is
unchanged, removing the dead-end where reading lines 100-150 of a large file
could not edit line 120. editText stays a provider primitive so version guard +
literal match + atomic rewrite remain one critical section, and the stale check
runs before matching so a stale edit reports FS_STALE_VERSION. tool-fs injects
fileContext, never reaching around to ctx.fs (the no-bypass contract).
This commit is contained in:
Dudu-0223
2026-06-26 17:23:18 +08:00
parent c7a197fb5f
commit ef37ce3b9d
42 changed files with 1899 additions and 1466 deletions
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12
packages/fs/tool-fs/src/write.ts
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@@ -1,8 +1,8 @@
/**
* The model-facing `write` tool: create or fully replace a UTF-8 text file.
* Execution goes through `ctx.fs`, which enforces the read-before-overwrite
* policy (updating an existing file requires a prior read in the same
* execution context; creating a new file does not).
* Execution goes through `ctx.fileContext`, which enforces the freshness policy
* (creating a new file needs no prior read; replacing an existing file requires
* a prior read in the same execution context at the unchanged version).
*
* @module @deepseek-ai/dsh-tool-fs/write
*/
@@ -46,8 +46,8 @@ export function apply(ctx: Context): void {
},
async execute(args, exec): Promise<ContentBlock[]> {
const input = parseWriteArgs(args)
const target = await ctx.fs.resolve(input.filePath)
const outcome = await ctx.fs.write(target, input.content, exec, exec.signal)
const target = await ctx.fileContext.resolve(input.filePath)
const outcome = await ctx.fileContext.write(target, input.content, exec, exec.signal)
return [{ type: 'text', text: formatWriteOutput(target.displayPath, outcome) }]
},
}))
@@ -57,7 +57,7 @@ export function apply(ctx: Context): void {
export const name = 'fs-write'
/** Services required by the `write` tool plugin. */
export const inject = ['tools', 'fs', 'systemPrompt']
export const inject = ['tools', 'fileContext', 'systemPrompt']
/** Named helper for direct registration in the root plugin and tests. */
export const applyWriteTool = apply