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fix(core): preserve shell output tail

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Shell truncation read from cursor zero, so large command output kept the head instead of the useful tail. Read the final capture window and cover the direction with head/tail markers.
This commit is contained in:
Aiden Cline 2026-07-12 19:38:50 +00:00
commit d8b7a0a391
9 changed files with 32 additions and 12 deletions
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5
packages/core/src/shell.ts
View file

@ -139,8 +139,9 @@ export const layer = Layer.effect(
const cursor = input?.cursor ?? 0
const limit = input?.limit ?? 65536
if (cursor >= session.size) return { output: "", cursor: session.size, size: session.size, truncated: false }
const start = Math.max(0, cursor)
const length = Math.min(limit, session.size - start)
const available = session.size - Math.max(0, cursor)
const start = input?.keep === "tail" ? Math.max(cursor, session.size - limit) : Math.max(0, cursor)
const length = Math.min(limit, available)
const buffer = Buffer.alloc(length)
const bytesRead = yield* Effect.promise(
() =>

4
packages/core/src/tool/shell.ts
View file

@ -201,7 +201,7 @@ export const Plugin = {
const settleShell = Effect.fn("ShellTool.settleShell")(function* () {
const final = yield* shell.wait(info.id)
const page = yield* shell.output(info.id, { limit: MAX_CAPTURE_BYTES })
const page = yield* shell.output(info.id, { limit: MAX_CAPTURE_BYTES, keep: "tail" })
if (final.status === "timeout") {
return {
@ -213,7 +213,7 @@ export const Plugin = {
}
}
const truncated = page.size > page.cursor
const truncated = page.size > MAX_CAPTURE_BYTES
const body = page.output || "(no output)"
const notice = truncated ? `\n\n[output truncated; full output saved to: ${final.file}]` : ""
return {

13
packages/core/test/tool-shell.test.ts
View file

@ -162,10 +162,10 @@ const idleCommand = isWindows ? "Start-Sleep -Seconds 60" : "sleep 60"
const bodyExitCommand = isWindows
? "[Console]::Out.Write('body'); Start-Sleep -Milliseconds 100; exit 7"
: "printf body && exit 7"
const overflowCommand = (bytes: number) =>
const overflowMarkersCommand = (bytes: number) =>
isWindows
? `[Console]::Out.Write(('x' * ${bytes})); Start-Sleep -Milliseconds 100`
: `head -c ${bytes} /dev/zero | tr '\\0' 'x'`
? `[Console]::Out.Write('head-marker'); [Console]::Out.Write(('x' * ${bytes})); [Console]::Out.Write('tail-marker'); Start-Sleep -Milliseconds 100`
: `printf head-marker; head -c ${bytes} /dev/zero | tr '\\0' 'x'; printf tail-marker`
const withSession = <A, E, R>(directory: string, body: (registry: ToolRegistry.Interface) => Effect.Effect<A, E, R>) =>
Effect.gen(function* () {
@ -396,15 +396,18 @@ describe("ShellTool", () => {
reset()
const bytes = ShellTool.MAX_CAPTURE_BYTES + 1024
return withSession(tmp.path, (registry) =>
settleTool(registry, call({ command: overflowCommand(bytes) }, "call-overflow")),
settleTool(registry, call({ command: overflowMarkersCommand(bytes) }, "call-overflow")),
).pipe(
Effect.andThen((settled) =>
Effect.sync(() => {
expect(settled.output?.structured).toMatchObject({ exit: 0, truncated: true })
expect(settled.output?.content[0]).toMatchObject({
type: "text",
text: expect.stringContaining("output truncated; full output saved to:"),
text: expect.stringMatching(/tail-marker[\s\S]*output truncated; full output saved to:/),
})
const content = settled.output?.content[0]
if (content?.type === "text" && typeof content.text === "string")
expect(content.text.includes("head-marker")).toBe(false)
}),
),
)