fix(opencode): add input limit for compaction (#8465)

packages/opencode/test/session/compaction.test.ts

@@ -10,13 +10,19 @@ import type { Provider } from "../../src/provider/provider"
 
 Log.init({ print: false })
 
-function createModel(opts: { context: number; output: number; cost?: Provider.Model["cost"] }): Provider.Model {
+function createModel(opts: {
+  context: number
+  output: number
+  input?: number
+  cost?: Provider.Model["cost"]
+}): Provider.Model {
   return {
     id: "test-model",
     providerID: "test",
     name: "Test",
     limit: {
       context: opts.context,
+      input: opts.input,
       output: opts.output,
     },
     cost: opts.cost ?? { input: 0, output: 0, cache: { read: 0, write: 0 } },
@@ -70,6 +76,42 @@ describe("session.compaction.isOverflow", () => {
     })
   })
 
+  test("respects input limit for input caps", async () => {
+    await using tmp = await tmpdir()
+    await Instance.provide({
+      directory: tmp.path,
+      fn: async () => {
+        const model = createModel({ context: 400_000, input: 272_000, output: 128_000 })
+        const tokens = { input: 271_000, output: 1_000, reasoning: 0, cache: { read: 2_000, write: 0 } }
+        expect(await SessionCompaction.isOverflow({ tokens, model })).toBe(true)
+      },
+    })
+  })
+
+  test("returns false when input/output are within input caps", async () => {
+    await using tmp = await tmpdir()
+    await Instance.provide({
+      directory: tmp.path,
+      fn: async () => {
+        const model = createModel({ context: 400_000, input: 272_000, output: 128_000 })
+        const tokens = { input: 200_000, output: 20_000, reasoning: 0, cache: { read: 10_000, write: 0 } }
+        expect(await SessionCompaction.isOverflow({ tokens, model })).toBe(false)
+      },
+    })
+  })
+
+  test("returns false when output within limit with input caps", async () => {
+    await using tmp = await tmpdir()
+    await Instance.provide({
+      directory: tmp.path,
+      fn: async () => {
+        const model = createModel({ context: 200_000, input: 120_000, output: 10_000 })
+        const tokens = { input: 50_000, output: 9_999, reasoning: 0, cache: { read: 0, write: 0 } }
+        expect(await SessionCompaction.isOverflow({ tokens, model })).toBe(false)
+      },
+    })
+  })
+
   test("returns false when model context limit is 0", async () => {
     await using tmp = await tmpdir()
     await Instance.provide({