fix(tool-fs): write always renders a diff card on the completed update

A Write CREATE rendered its completed tool_call_update as the model-facing
result TEXT (`<path>…</path>…Created file`), which — because an ACP
tool_call_update.content REPLACES the call's content — clobbered the
new-file diff the pending call installed. So Zed showed the diff, then
replaced it with raw XML-ish text; only overwrite/edit looked right
(their result re-sends a diff).

write's presentResult now ALWAYS returns a diff card for a successful
write: the applied contextual hunk from `meta` when there is one
(overwrite), else an args-derived whole-file diff (`oldText: null`) for a
create or an unchanged-content overwrite. This matches claude-agent-acp,
where the create diff rides on the update and no result text replaces it.
An error still falls through to generic rendering so its message shows.
edit is unchanged (it always has a hunk; no whole-file fallback).

Re-recorded fs-write / fs-write-overwrite goldens; the create's completed
update is now a {type:'diff'} block, not the XML result text.
This commit is contained in:
Tianyi Cui
2026-07-03 20:52:36 +08:00
parent 57923c68ee
commit 53b215c646
7 files changed
+292 -308

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@@ -31,7 +31,7 @@ This is the general shape ("a tool attaches durable result presentation"), not a
Per the [capability-seam split](2026-06-13-capability-seams.md), the storage backend returns only **storage facts** and the model-facing tool owns **presentation**:
- `dsh-fs` widens `FsEditOutcome` with `{ before: string; after: string }` and `FsWriteOutcome` with `{ before: string | null; after: string }` (`before: null` ⇒ a create, or an existing-but-undiffable binary/non-UTF-8 file). The local backend already holds both texts at write time; it returns them as raw LF-normalized text, with **no diff/UI concept** entering the seam.
- `dsh-tool-fs` computes the contextual hunk from before/after and attaches it as `meta: { diffs: FileDiff[] }`. A result diff is emitted only when a before-version exists — edit always; write on overwrite; **a create emits none** (there is no before), matching `claude-agent-acp`'s empty `structuredPatch` on create. A failed/aborted/policy-rejected mutation applied nothing, so it carries no `meta` and renders no result diff.
- `dsh-tool-fs` computes the contextual hunk from before/after and attaches it as `meta: { diffs: FileDiff[] }`. A contextual hunk is computed only when a before-version exists — edit always; write on overwrite; a create has no before, matching `claude-agent-acp`'s empty `structuredPatch` on create. But the completed `tool_call_update` is ALWAYS a `diff` card for a successful mutation: an ACP `tool_call_update.content` REPLACES the call's content, so rendering the model-facing result text would clobber the pending diff. So `write`'s result falls back to an args-derived whole-file diff (`oldText: null`) when it has no contextual hunk (a create, or an overwrite whose content is unchanged), and `edit` — which always changes content — always has a hunk. A failed/aborted/policy-rejected mutation applied nothing, so it carries no `meta` and falls through to the generic error rendering (its message must show).
### 3. The bridge renders a `diff` result card
@@ -1,145 +1,124 @@
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{"type":"assistant/message","seq":92,"time":1783082853079,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The file was created successfully. Now I just need to reply with exactly \"DONE\"."},{"type":"text","text":"DONE"}],"usage":{"inputTokens":126,"outputTokens":21,"cacheReadTokens":2304,"reasoningTokens":18}},"sourceEventSeqs":[66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91],"surfaceOp":"append"}
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@@ -27,21 +27,23 @@
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" word"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"D"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ONE"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\"."}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_ICLusq2lV6YYBtn1szVM9454","title":"Write notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}],"content":[{"type":"diff","path":"notes.txt","oldText":null,"newText":"hello world"}]}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_ICLusq2lV6YYBtn1szVM9454","status":"completed","content":[{"type":"content","content":{"type":"text","text":"<path>{{cwd}}/notes.txt</path>\n<type>file</type>\n<content>\nCreated file\n</content>"}}]}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"File"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call","toolCallId":"call_00_4aj3gzzSDsP64mCcrn8k4591","title":"Write notes.txt","kind":"edit","status":"in_progress","locations":[{"path":"notes.txt"}],"content":[{"type":"diff","path":"notes.txt","oldText":null,"newText":"hello world"}]}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"tool_call_update","toolCallId":"call_00_4aj3gzzSDsP64mCcrn8k4591","status":"completed","content":[{"type":"diff","path":"notes.txt","oldText":null,"newText":"hello world"}],"title":"Write notes.txt"}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" file"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" was"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" created"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" successfully"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" Now"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" I"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" should"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" just"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" need"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" exactly"}}}}
+9 -5
View File
@@ -83,14 +83,18 @@ export function applyWriteTool(ctx: Context): void {
locations: [{ path: args.file_path }],
}
},
// Result-time display: for an OVERWRITE, the applied contextual-diff hunks on
// `meta` supersede the call-time whole-file snippet. A create carries no meta
// (no "before"), so this returns undefined and the call-time new-file card
// stands; an error or malformed meta also falls through to generic rendering.
// Result-time display: a `diff` card so the completed `tool_call_update`
// re-installs the diff rather than the model-facing result text (an ACP
// `tool_call_update.content` REPLACES the call's content, so a text result
// would clobber the pending diff card). An OVERWRITE uses the applied
// contextual hunks on `meta`; a CREATE has no `meta` (no prior content), so
// its whole-file new-file diff is derived from `args.content` (replay-safe,
// matching the call-time card). An error falls through to generic rendering
// so its message shows.
presentResult(args, result: ToolResult): DiffResultView | undefined {
if (result.isError) return undefined
const diffs = diffsFromMeta(result.meta)
if (diffs === undefined) return undefined
?? [{ path: args.file_path, oldText: null, newText: args.content }]
return { card: 'diff', title: `Write ${args.file_path}`, diffs }
},
}))
+23 -5
View File
@@ -440,16 +440,21 @@ describe('result-time contextual diff (meta + presentResult)', () => {
expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: 'a\nb\nc\nOLD\nd\ne\nf', newText: 'a\nb\nc\nNEW\nd\ne\nf' }] })
})
it('write CREATE: no before-version → no meta, presentResult returns undefined (call-time card stands)', async () => {
it('write CREATE: no before-version → no meta, but presentResult still renders a whole-file diff card', async () => {
// A create has no prior content (no `meta`), yet the completed card must be a
// `diff` — an ACP tool_call_update.content REPLACES the call's content, so a
// non-diff result would clobber the pending new-file diff. The whole-file diff
// is derived from the args (oldText:null), replay-safe.
const { ctx } = await setup()
const session = { header: {} }
const result = await call(ctx, 'write', { file_path: 'new.txt', content: 'fresh\n' }, { session })
expect(result.isError).toBe(false)
expect(result.meta).toBeUndefined()
expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'new.txt', content: 'fresh\n' }, result)).toBeUndefined()
const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'new.txt', content: 'fresh\n' }, result)
expect(view).toEqual({ card: 'diff', title: 'Write new.txt', diffs: [{ path: 'new.txt', oldText: null, newText: 'fresh\n' }] })
})
it('write OVERWRITE with identical content: a before exists but yields no hunk → no meta', async () => {
it('write OVERWRITE with identical content: a before exists but yields no hunk → no meta, presentResult falls back to a whole-file diff', async () => {
const { ctx, fs } = await setup()
const session = { header: {} }
fs.files.set('key:a.txt', 'same\n')
@@ -457,6 +462,8 @@ describe('result-time contextual diff (meta + presentResult)', () => {
const result = await call(ctx, 'write', { file_path: 'a.txt', content: 'same\n' }, { session })
expect(result.isError).toBe(false)
expect(result.meta).toBeUndefined()
const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'same\n' }, result)
expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: null, newText: 'same\n' }] })
})
it('presentResult returns undefined on an error result (nothing applied)', async () => {
@@ -466,10 +473,21 @@ describe('result-time contextual diff (meta + presentResult)', () => {
expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, errorResult)).toBeUndefined()
})
it('presentResult returns undefined on malformed meta (defensive narrowing)', async () => {
it('edit presentResult returns undefined on malformed meta (defensive narrowing)', async () => {
// edit has no whole-file fallback (only a literal replacement), so a malformed
// meta yields the generic "updated successfully" rendering.
const { ctx } = await setup()
const badMeta = { content: [{ type: 'text' as const, text: 'ok' }], isError: false, meta: { diffs: 'nope' } }
expect(ctx.tools.get('edit')?.presentResult?.({ file_path: 'a.txt', old_string: 'x', new_string: 'y' }, badMeta)).toBeUndefined()
expect(ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, badMeta)).toBeUndefined()
})
it('write presentResult falls back to a whole-file diff on malformed meta (never leaks the result text)', async () => {
// write always renders a diff card so the completed update can't clobber the
// pending diff with the model-facing text; a malformed meta falls back to the
// args-derived whole-file diff, same as a create.
const { ctx } = await setup()
const badMeta = { content: [{ type: 'text' as const, text: 'ok' }], isError: false, meta: { diffs: 'nope' } }
const view = ctx.tools.get('write')?.presentResult?.({ file_path: 'a.txt', content: 'y' }, badMeta)
expect(view).toEqual({ card: 'diff', title: 'Write a.txt', diffs: [{ path: 'a.txt', oldText: null, newText: 'y' }] })
})
})