fix(session): accept legacy summary diffs (#26579)

Co-authored-by: Developer <temp@example.com>

packages/opencode/src/cli/cmd/export.ts

@@ -23,10 +23,10 @@ function span(id: string, value: { value: string; start: number; end: number })
   }
 }
 
-function diff(kind: string, diffs: { file: string; patch?: string }[] | undefined) {
+function diff(kind: string, diffs: { file?: string; patch?: string }[] | undefined) {
   return diffs?.map((item, i) => ({
     ...item,
-    file: redact(`${kind}-file`, String(i), item.file),
+    file: item.file === undefined ? undefined : redact(`${kind}-file`, String(i), item.file),
     patch: item.patch === undefined ? undefined : redact(`${kind}-patch`, String(i), item.patch),
   }))
 }

packages/opencode/src/cli/cmd/tui/plugin/api.tsx

@@ -148,7 +148,9 @@ function stateApi(sync: ReturnType<typeof useSync>): TuiPluginApi["state"] {
         return sync.data.session.length
       },
       diff(sessionID) {
-        return sync.data.session_diff[sessionID] ?? []
+        return (sync.data.session_diff[sessionID] ?? []).flatMap((item) =>
+          item.file === undefined ? [] : [{ ...item, file: item.file }],
+        )
       },
       todo(sessionID) {
         return sync.data.todo[sessionID] ?? []

packages/opencode/src/session/summary.ts

@@ -134,6 +134,7 @@ export const layer = Layer.effect(
         .read<Snapshot.FileDiff[]>(["session_diff", input.sessionID])
         .pipe(Effect.catch(() => Effect.succeed([] as Snapshot.FileDiff[])))
       const next = diffs.map((item) => {
+        if (item.file === undefined) return item
         const file = unquoteGitPath(item.file)
         if (file === item.file) return item
         return { ...item, file }

packages/opencode/src/snapshot/index.ts

@@ -20,10 +20,10 @@ export const Patch = Schema.Struct({
 export type Patch = typeof Patch.Type
 
 export const FileDiff = Schema.Struct({
-  file: Schema.String,
   // Optional because legacy/imported `summary_diffs` on disk may omit
-  // the patch text (see #26574). Required-Schema rejected the whole
-  // /session/<id>/diff response and broke session loading on Desktop.
+  // file details and patch text. Required Schema rejected the whole
+  // session response and broke session loading on Desktop.
+  file: Schema.optional(Schema.String),
   patch: Schema.optional(Schema.String),
   additions: NonNegativeInt,
   deletions: NonNegativeInt,

packages/opencode/test/server/httpapi-session.test.ts

@@ -297,6 +297,36 @@ describe("session HttpApi", () => {
     ),
   )
 
+  it.live(
+    "serves sessions with migrated summary diffs missing file details",
+    withTmp({ git: true, config: { formatter: false, lsp: false } }, (tmp) =>
+      Effect.gen(function* () {
+        const session = yield* createSession(tmp.path, { title: "legacy diff" })
+        yield* Effect.sync(() =>
+          Database.use((db) =>
+            db
+              .update(SessionTable)
+              .set({
+                summary_additions: 1,
+                summary_deletions: 0,
+                summary_files: 1,
+                summary_diffs: [{ additions: 1, deletions: 0 }],
+              })
+              .where(eq(SessionTable.id, session.id))
+              .run(),
+          ),
+        )
+
+        const response = yield* request(pathFor(SessionPaths.get, { sessionID: session.id }), {
+          headers: { "x-opencode-directory": tmp.path },
+        })
+
+        expect(response.status).toBe(200)
+        expect((yield* json<Session.Info>(response)).summary?.diffs).toEqual([{ additions: 1, deletions: 0 }])
+      }),
+    ),
+  )
+
   it.live(
     "serves lifecycle mutation routes",
     withTmp({ git: true, config: { formatter: false, lsp: false, share: "disabled" } }, (tmp) =>

packages/opencode/test/session/schema-decoding.test.ts

@@ -83,6 +83,26 @@ describe("Session.Info", () => {
     expect(Session.Info.zod.parse(input)).toEqual(input)
   })
 
+  test("accepts migrated summary diffs without file details", () => {
+    const input = {
+      id: sessionID,
+      slug: "legacy-diff",
+      projectID,
+      directory: "/tmp/proj",
+      title: "Legacy diff",
+      version: "0.1.0",
+      summary: {
+        additions: 1,
+        deletions: 0,
+        files: 1,
+        diffs: [{ additions: 1, deletions: 0 }],
+      },
+      time: { created: 1, updated: 2 },
+    }
+    expect(decode(input)).toEqual(input)
+    expect(Session.Info.zod.parse(input)).toEqual(input)
+  })
+
   test("rejects unbranded session id", () => {
     const bad = { id: "not-a-session-id" } as unknown
     expect(() => decode(bad)).toThrow()

packages/opencode/test/session/snapshot-tool-race.test.ts

@@ -238,7 +238,7 @@ it.live("tool execution produces non-empty session diff (snapshot race)", () =>
       expect(tool?.state.status).toBe("completed")
 
       // Poll for diff — summarize() is fire-and-forget
-      let diff: Array<{ file: string }> = []
+      let diff: Array<{ file?: string }> = []
       for (let i = 0; i < 50; i++) {
         diff = yield* summary.diff({ sessionID: session.id })
         if (diff.length > 0) break