feat(core): wire v2 subagent tool (#34320)

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Kit Langton 2026-06-28 12:52:39 -04:00 committed by GitHub
commit 94e3a29d2f
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15 changed files with 631 additions and 49 deletions

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@ -56,6 +56,14 @@ const it = testEffect(
const location = Location.Ref.make({ directory: AbsolutePath.make("/project") })
const id = SessionV2.ID.create()
const assertCreateInputTypes = (session: SessionV2.Interface) => {
// @ts-expect-error location or parentID is required.
session.create({})
// @ts-expect-error child sessions inherit their parent's location.
session.create({ parentID: SessionV2.ID.create(), location })
}
void assertCreateInputTypes
describe("SessionV2.create", () => {
it.effect("creates a fresh projected session when the ID is omitted", () =>
Effect.gen(function* () {
@ -102,6 +110,27 @@ describe("SessionV2.create", () => {
}),
)
it.effect("inherits location from an existing parent when omitted", () =>
Effect.gen(function* () {
const session = yield* SessionV2.Service
const parent = yield* session.create({ location })
const child = yield* session.create({ parentID: parent.id, title: "child" })
expect(child).toMatchObject({ parentID: parent.id, location })
}),
)
it.effect("rejects child creation when the parent does not exist", () =>
Effect.gen(function* () {
const session = yield* SessionV2.Service
const missing = SessionV2.ID.create()
expect(yield* Effect.flip(session.create({ parentID: missing, title: "child" }))).toEqual(
new SessionV2.NotFoundError({ sessionID: missing }),
)
}),
)
it.effect("returns the existing Session when one ID is reused with different create arguments", () =>
Effect.gen(function* () {
const session = yield* SessionV2.Service

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@ -39,6 +39,7 @@ const execution = Layer.succeed(
Effect.sync(() => {
wakeCalls.push(sessionID)
}),
awaitIdle: () => Effect.void,
}),
)
const sessions = SessionV2.layer.pipe(

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@ -99,6 +99,7 @@ const execution = Layer.effect(
resume: coordinator.run,
wake: coordinator.wake,
interrupt: coordinator.interrupt,
awaitIdle: coordinator.awaitIdle,
})
}),
).pipe(Layer.provide(runner))

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@ -258,6 +258,7 @@ const execution = Layer.effect(
resume: coordinator.run,
wake: coordinator.wake,
interrupt: coordinator.interrupt,
awaitIdle: coordinator.awaitIdle,
})
}),
).pipe(Layer.provide(runner))
@ -380,7 +381,10 @@ const recordedEventTypes = (id: SessionV2.ID) =>
.where(eq(EventTable.aggregate_id, id))
.orderBy(asc(EventTable.seq))
.all()
.pipe(Effect.orDie, Effect.map((rows) => rows.map((row) => row.type)))
.pipe(
Effect.orDie,
Effect.map((rows) => rows.map((row) => row.type)),
)
})
const replaySessionProjection = (id: SessionV2.ID) =>

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@ -0,0 +1,54 @@
import { describe, expect } from "bun:test"
import { Effect, Layer } from "effect"
import { Database } from "@opencode-ai/core/database/database"
import { EventV2 } from "@opencode-ai/core/event"
import { Location } from "@opencode-ai/core/location"
import { ProjectV2 } from "@opencode-ai/core/project"
import { AbsolutePath } from "@opencode-ai/core/schema"
import { SessionV2 } from "@opencode-ai/core/session"
import { SessionProjector } from "@opencode-ai/core/session/projector"
import { SessionExecution } from "@opencode-ai/core/session/execution"
import { SessionStore } from "@opencode-ai/core/session/store"
import { locationServiceMapLayer } from "@opencode-ai/core/location-services"
import { testEffect } from "./lib/effect"
const location = Location.Ref.make({ directory: AbsolutePath.make("/project") })
const awaited: SessionV2.ID[] = []
const projects = Layer.mock(ProjectV2.Service, {
resolve: (directory) => Effect.succeed({ id: ProjectV2.ID.global, directory }),
})
const execution = Layer.mock(SessionExecution.Service, {
awaitIdle: (sessionID) => Effect.sync(() => awaited.push(sessionID)),
})
const sessions = SessionV2.layer.pipe(
Layer.provide(locationServiceMapLayer),
Layer.provide(EventV2.defaultLayer),
Layer.provide(Database.defaultLayer),
Layer.provide(SessionStore.defaultLayer),
Layer.provide(projects),
Layer.provide(execution),
)
const it = testEffect(
Layer.mergeAll(
Database.defaultLayer,
EventV2.defaultLayer,
projects,
SessionProjector.defaultLayer,
SessionStore.defaultLayer,
sessions,
),
)
describe("SessionV2.wait", () => {
it.effect("delegates to SessionExecution.awaitIdle", () =>
Effect.gen(function* () {
awaited.length = 0
const sessions = yield* SessionV2.Service
const session = yield* sessions.create({ location })
yield* sessions.wait(session.id)
expect(awaited).toEqual([session.id])
}),
)
})

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@ -0,0 +1,283 @@
import { describe, expect } from "bun:test"
import { DateTime, Effect, Layer, Schema } from "effect"
import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
import { LayerNode } from "@opencode-ai/core/effect/layer-node"
import { makeGlobalNode } from "@opencode-ai/core/effect/app-node"
import { Database } from "@opencode-ai/core/database/database"
import { EventV2 } from "@opencode-ai/core/event"
import { Location } from "@opencode-ai/core/location"
import { ModelV2 } from "@opencode-ai/core/model"
import { ProviderV2 } from "@opencode-ai/core/provider"
import { AbsolutePath } from "@opencode-ai/core/schema"
import { AgentV2 } from "@opencode-ai/core/agent"
import { BackgroundJob } from "@opencode-ai/core/background-job"
import { LocationServiceMap } from "@opencode-ai/core/location-service-map"
import { SessionV2 } from "@opencode-ai/core/session"
import { SessionEvent } from "@opencode-ai/core/session/event"
import { SessionExecution } from "@opencode-ai/core/session/execution"
import { SessionMessage } from "@opencode-ai/core/session/message"
import { SessionRunnerModel } from "@opencode-ai/core/session/runner/model"
import { SessionStore } from "@opencode-ai/core/session/store"
import { SubagentTool } from "@opencode-ai/core/tool/subagent"
import { ToolRegistry } from "@opencode-ai/core/tool/registry"
import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
import { tmpdir } from "./fixture/tmpdir"
import { testEffect } from "./lib/effect"
import { executeTool, settleTool, toolIdentity } from "./lib/tool"
const childText = "child final response"
const childModel = ModelV2.Ref.make({ id: ModelV2.ID.make("child"), providerID: ProviderV2.ID.make("test") })
const parentModel = ModelV2.Ref.make({ id: ModelV2.ID.make("parent"), providerID: ProviderV2.ID.make("test") })
const tokens = { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } }
const outputSessionID = (value: unknown) => Schema.decodeUnknownSync(SubagentTool.Output)(value).sessionID
const executionNode = makeGlobalNode({
service: SessionExecution.Service,
layer: Layer.effect(
SessionExecution.Service,
Effect.gen(function* () {
const events = yield* EventV2.Service
const store = yield* SessionStore.Service
const completed = new Set<SessionV2.ID>()
const complete = Effect.fn("SubagentTest.complete")(function* (sessionID: SessionV2.ID) {
if (completed.has(sessionID)) return
if ((yield* store.get(sessionID))?.title.includes("fail")) {
yield* new SessionRunnerModel.ModelNotSelectedError({ sessionID })
return
}
completed.add(sessionID)
const assistantMessageID = SessionMessage.ID.create()
const textID = "text_subagent_test"
yield* events.publish(SessionEvent.Step.Started, {
sessionID,
assistantMessageID,
timestamp: yield* DateTime.now,
agent: AgentV2.ID.make("reviewer"),
model: childModel,
})
yield* events.publish(SessionEvent.Text.Started, {
sessionID,
assistantMessageID,
timestamp: yield* DateTime.now,
textID,
})
yield* events.publish(SessionEvent.Text.Ended, {
sessionID,
assistantMessageID,
timestamp: yield* DateTime.now,
textID,
text: childText,
})
yield* events.publish(SessionEvent.Step.Ended, {
sessionID,
assistantMessageID,
timestamp: yield* DateTime.now,
finish: "stop",
cost: 0,
tokens,
})
})
return SessionExecution.Service.of({
active: Effect.succeed(new Set()),
resume: complete,
wake: () => Effect.void,
interrupt: () => Effect.void,
awaitIdle: (sessionID) => complete(sessionID).pipe(Effect.exit, Effect.asVoid),
})
}),
),
deps: [EventV2.node, SessionStore.node],
})
const layer = AppNodeBuilder.build(
LayerNode.bind(
LayerNode.group([
Database.node,
EventV2.node,
BackgroundJob.node,
ToolOutputStore.cleanupNode,
SessionV2.node,
SubagentTool.node,
LocationServiceMap.node,
]),
SessionExecution.node,
executionNode,
),
)
const it = testEffect(layer)
const withSubagent = (location: Location.Ref) =>
Effect.gen(function* () {
const locations = yield* LocationServiceMap.Service
yield* AgentV2.Service.use((agents) =>
agents.transform((draft) => {
draft.update(AgentV2.ID.make("reviewer"), (agent) => {
agent.mode = "subagent"
agent.model = childModel
})
draft.update(AgentV2.ID.make("fallback"), (agent) => {
agent.mode = "subagent"
})
draft.update(AgentV2.ID.make("primary"), (agent) => {
agent.mode = "primary"
})
}),
).pipe(Effect.provide(locations.get(location)))
})
describe("SubagentTool", () => {
it.live("registers globally while resolving agents from the caller location", () =>
Effect.acquireRelease(
Effect.promise(() => tmpdir()),
(dir) => Effect.promise(() => dir[Symbol.asyncDispose]()),
).pipe(
Effect.flatMap((dir) =>
Effect.gen(function* () {
const location = Location.Ref.make({ directory: AbsolutePath.make(dir.path) })
const session = yield* SessionV2.Service
const parent = yield* session.create({ location })
yield* withSubagent(parent.location)
const locations = yield* LocationServiceMap.Service
const registry = yield* ToolRegistry.Service.pipe(Effect.provide(locations.get(parent.location)))
expect((yield* registry.materialize()).definitions.map((tool) => tool.name)).toContain(SubagentTool.name)
expect(
yield* executeTool(registry, {
sessionID: parent.id,
...toolIdentity,
call: {
type: "tool-call",
id: "call-primary",
name: SubagentTool.name,
input: { agent: "primary", description: "primary", prompt: "should fail" },
},
}),
).toEqual({ type: "error", value: "Agent primary cannot run as a subagent" })
}),
),
),
)
it.live("runs a foreground child session and returns the final assistant text", () =>
Effect.acquireRelease(
Effect.promise(() => tmpdir()),
(dir) => Effect.promise(() => dir[Symbol.asyncDispose]()),
).pipe(
Effect.flatMap((dir) =>
Effect.gen(function* () {
const location = Location.Ref.make({ directory: AbsolutePath.make(dir.path) })
const sessions = yield* SessionV2.Service
const parent = yield* sessions.create({ location, model: parentModel })
yield* withSubagent(parent.location)
const locations = yield* LocationServiceMap.Service
const registry = yield* ToolRegistry.Service.pipe(Effect.provide(locations.get(parent.location)))
const settled = yield* settleTool(registry, {
sessionID: parent.id,
...toolIdentity,
call: {
type: "tool-call",
id: "call-subagent",
name: SubagentTool.name,
input: { agent: "reviewer", description: "review", prompt: "review this" },
},
})
expect(settled.output?.structured).toMatchObject({ status: "completed", output: childText })
const child = yield* sessions.get(outputSessionID(settled.output?.structured))
expect(child).toMatchObject({
parentID: parent.id,
location: parent.location,
agent: "reviewer",
model: childModel,
})
const fallback = yield* settleTool(registry, {
sessionID: parent.id,
...toolIdentity,
call: {
type: "tool-call",
id: "call-subagent-fallback",
name: SubagentTool.name,
input: { agent: "fallback", description: "fallback", prompt: "fallback" },
},
})
const fallbackChild = yield* sessions.get(outputSessionID(fallback.output?.structured))
expect(fallbackChild).toMatchObject({ parentID: parent.id, model: parentModel })
}),
),
),
)
it.live("returns child runner failures as tool errors", () =>
Effect.acquireRelease(
Effect.promise(() => tmpdir()),
(dir) => Effect.promise(() => dir[Symbol.asyncDispose]()),
).pipe(
Effect.flatMap((dir) =>
Effect.gen(function* () {
const location = Location.Ref.make({ directory: AbsolutePath.make(dir.path) })
const sessions = yield* SessionV2.Service
const parent = yield* sessions.create({ location })
yield* withSubagent(parent.location)
const locations = yield* LocationServiceMap.Service
const registry = yield* ToolRegistry.Service.pipe(Effect.provide(locations.get(parent.location)))
expect(
yield* executeTool(registry, {
sessionID: parent.id,
...toolIdentity,
call: {
type: "tool-call",
id: "call-subagent-failure",
name: SubagentTool.name,
input: { agent: "reviewer", description: "fail review", prompt: "please fail" },
},
}),
).toEqual({ type: "error", value: expect.stringContaining("No model is available for session") })
}),
),
),
)
it.live("promotes background work and injects one synthetic parent completion", () =>
Effect.acquireRelease(
Effect.promise(() => tmpdir()),
(dir) => Effect.promise(() => dir[Symbol.asyncDispose]()),
).pipe(
Effect.flatMap((dir) =>
Effect.gen(function* () {
const location = Location.Ref.make({ directory: AbsolutePath.make(dir.path) })
const sessions = yield* SessionV2.Service
const jobs = yield* BackgroundJob.Service
const parent = yield* sessions.create({ location })
yield* withSubagent(parent.location)
const locations = yield* LocationServiceMap.Service
const registry = yield* ToolRegistry.Service.pipe(Effect.provide(locations.get(parent.location)))
const settled = yield* settleTool(registry, {
sessionID: parent.id,
...toolIdentity,
call: {
type: "tool-call",
id: "call-background-subagent",
name: SubagentTool.name,
input: { agent: "reviewer", description: "background review", prompt: "review", background: true },
},
})
const childID = outputSessionID(settled.output?.structured)
expect(settled.output?.structured).toMatchObject({ status: "running" })
yield* jobs.promote(childID)
yield* Effect.yieldNow
const synthetic = (yield* sessions.context(parent.id)).filter((message) => message.type === "synthetic")
expect(synthetic).toHaveLength(1)
expect(synthetic[0]?.text).toContain(`<subagent id="${childID}" state="completed"`)
expect(synthetic[0]?.text).toContain(childText)
}),
),
),
)
})