openAgent

1import { describe, expect } from "bun:test"
2import { Tool } from "@opencode-ai/core/tool/tool"
3import { ApplicationTools } from "@opencode-ai/core/tool/application-tools"
4import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
5import { LayerNode } from "@opencode-ai/core/effect/layer-node"
6import { SessionV2 } from "@opencode-ai/core/session"
7import { SessionMessage } from "@opencode-ai/core/session/message"
8import { AgentV2 } from "@opencode-ai/core/agent"
9import { ToolRegistry } from "@opencode-ai/core/tool/registry"
10import { executeTool, settleTool, toolDefinitions } from "./lib/tool"
11import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
12import { Tools } from "@opencode-ai/core/tool/tools"
13import { Deferred, Effect, Exit, Fiber, Schema, Scope } from "effect"
14import { testEffect } from "./lib/effect"
15 
16const it = testEffect(
17  AppNodeBuilder.build(LayerNode.group([ApplicationTools.node, ToolRegistry.node, ToolRegistry.toolsNode]), [
18    [ToolOutputStore.node, ToolOutputStore.nodeWithoutConfig],
19  ]),
20)
21 
22const sessionID = SessionV2.ID.make("ses_application_tool")
23const agent = AgentV2.ID.make("build")
24const assistantMessageID = SessionMessage.ID.make("msg_application_tool")
25const contextual = (contexts: Tool.Context[]) =>
26  Tool.make({
27    description: "Read application context",
28    input: Schema.Struct({ query: Schema.String }),
29    output: Schema.Struct({ answer: Schema.String }),
30    execute: ({ query }, context) =>
31      Effect.sync(() => {
32        contexts.push(context)
33        return { answer: query.toUpperCase() }
34      }),
35    toModelOutput: ({ output }) => [
36      { type: "text", text: output.answer },
37      { type: "file", data: "aGVsbG8=", mime: "image/png", name: "result.png" },
38    ],
39  })
40 
41describe("ApplicationTools", () => {
42  it.effect("keeps the Core carrier opaque and executes its single handler", () =>
43    Effect.gen(function* () {
44      const applications = yield* ApplicationTools.Service
45      const registry = yield* ToolRegistry.Service
46      const contexts: Tool.Context[] = []
47      const tool = contextual(contexts)
48      expect(Object.keys(tool)).toEqual([])
49 
50      yield* applications.register({ opaque: tool })
51      expect(
52        yield* executeTool(registry, {
53          sessionID,
54          agent,
55          assistantMessageID,
56          call: { type: "tool-call", id: "call-opaque", name: "opaque", input: { query: "once" } },
57        }),
58      ).toEqual({
59        type: "content",
60        value: [
61          { type: "text", text: "ONCE" },
62          { type: "file", uri: "data:image/png;base64,aGVsbG8=", mime: "image/png", name: "result.png" },
63        ],
64      })
65      expect(contexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-opaque" }])
66    }),
67  )
68 
69  it.effect("exposes narrow scoped Location registration and validates names", () =>
70    Effect.gen(function* () {
71      const tools: Tools.Interface = yield* Tools.Service
72      const registry = yield* ToolRegistry.Service
73      const scope = yield* Scope.make()
74 
75      yield* tools.register({ location_tool: contextual([]) }).pipe(Scope.provide(scope))
76      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["location_tool"])
77      expect(yield* Effect.flip(tools.register({ "invalid name": contextual([]) }))).toBeInstanceOf(
78        Tool.RegistrationError,
79      )
80 
81      yield* Scope.close(scope, Exit.void)
82      expect(yield* toolDefinitions(registry)).toEqual([])
83    }),
84  )
85 
86  it.effect("filters an application tool by its name without adding execution authorization", () =>
87    Effect.gen(function* () {
88      const applications = yield* ApplicationTools.Service
89      const registry = yield* ToolRegistry.Service
90      const contexts: Tool.Context[] = []
91      yield* applications.register({ application_context: contextual(contexts) })
92 
93      expect(
94        yield* toolDefinitions(registry, [{ action: "application_context", resource: "*", effect: "deny" }]),
95      ).toEqual([])
96      expect(
97        yield* settleTool(registry, {
98          sessionID,
99          agent,
100          assistantMessageID,
101          call: { type: "tool-call", id: "call-denied", name: "application_context", input: { query: "hello" } },
102        }),
103      ).toMatchObject({ result: { type: "content" } })
104      expect(contexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-denied" }])
105    }),
106  )
107 
108  it.effect("advertises and executes a scoped application tool with Session context", () =>
109    Effect.gen(function* () {
110      const applications = yield* ApplicationTools.Service
111      const registry = yield* ToolRegistry.Service
112      const contexts: Tool.Context[] = []
113 
114      yield* applications.register({ application_context: contextual(contexts) })
115 
116      expect(yield* toolDefinitions(registry)).toMatchObject([
117        { name: "application_context", description: "Read application context" },
118      ])
119      expect(
120        yield* settleTool(registry, {
121          sessionID,
122          agent,
123          assistantMessageID,
124          call: { type: "tool-call", id: "call-context", name: "application_context", input: { query: "hello" } },
125        }),
126      ).toEqual({
127        result: {
128          type: "content",
129          value: [
130            { type: "text", text: "HELLO" },
131            { type: "file", uri: "data:image/png;base64,aGVsbG8=", mime: "image/png", name: "result.png" },
132          ],
133        },
134        output: {
135          structured: { answer: "HELLO" },
136          content: [
137            { type: "text", text: "HELLO" },
138            { type: "file", uri: "data:image/png;base64,aGVsbG8=", mime: "image/png", name: "result.png" },
139          ],
140        },
141      })
142      expect(contexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-context" }])
143    }),
144  )
145 
146  it.effect("removes an application tool when its registration scope closes", () =>
147    Effect.gen(function* () {
148      const applications = yield* ApplicationTools.Service
149      const registry = yield* ToolRegistry.Service
150      const scope = yield* Scope.make()
151 
152      yield* applications.register({ temporary: contextual([]) }).pipe(Scope.provide(scope))
153      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["temporary"])
154 
155      yield* Scope.close(scope, Exit.void)
156      expect(yield* toolDefinitions(registry)).toEqual([])
157    }),
158  )
159 
160  it.effect("removes a tool before settling a call produced from an earlier definition", () =>
161    Effect.gen(function* () {
162      const applications = yield* ApplicationTools.Service
163      const registry = yield* ToolRegistry.Service
164      const registrationScope = yield* Scope.make()
165      yield* applications.register({ contextual: contextual([]) }).pipe(Scope.provide(registrationScope))
166      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["contextual"])
167 
168      yield* Scope.close(registrationScope, Exit.void)
169      expect(
170        yield* settleTool(registry, {
171          sessionID,
172          agent,
173          assistantMessageID,
174          call: { type: "tool-call", id: "call-removed", name: "contextual", input: { query: "hello" } },
175        }),
176      ).toEqual({ result: { type: "error", value: "Unknown tool: contextual" } })
177    }),
178  )
179 
180  it.effect("does not leak a registration into an already closed scope", () =>
181    Effect.gen(function* () {
182      const applications = yield* ApplicationTools.Service
183      const registry = yield* ToolRegistry.Service
184      const scope = yield* Scope.make()
185      yield* Scope.close(scope, Exit.void)
186 
187      yield* applications.register({ closed: contextual([]) }).pipe(Scope.provide(scope))
188 
189      expect(yield* toolDefinitions(registry)).toEqual([])
190    }),
191  )
192 
193  it.effect("preserves an interrupted application registration until its scope closes", () =>
194    Effect.gen(function* () {
195      const applications = yield* ApplicationTools.Service
196      const registry = yield* ToolRegistry.Service
197      const scope = yield* Scope.make()
198      const registered = yield* Deferred.make<void>()
199      const fiber = yield* applications
200        .register({ interrupted: contextual([]) })
201        .pipe(
202          Effect.andThen(Deferred.succeed(registered, undefined)),
203          Effect.andThen(Effect.never),
204          Scope.provide(scope),
205          Effect.forkChild,
206        )
207      yield* Deferred.await(registered)
208      yield* Fiber.interrupt(fiber)
209 
210      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["interrupted"])
211      yield* Scope.close(scope, Exit.void)
212      expect(yield* toolDefinitions(registry)).toEqual([])
213    }),
214  )
215 
216  it.effect("captures the registered record before later State rebuilds", () =>
217    Effect.gen(function* () {
218      const applications = yield* ApplicationTools.Service
219      const registry = yield* ToolRegistry.Service
220      const registered = { stable: contextual([]) }
221      yield* applications.register(registered)
222      Object.assign(registered, { late: contextual([]) })
223 
224      yield* Effect.scoped(applications.register({ temporary: contextual([]) }))
225 
226      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["stable"])
227    }),
228  )
229 
230  it.effect("settles with the current same-name application tool and restores earlier registrations", () =>
231    Effect.gen(function* () {
232      const applications = yield* ApplicationTools.Service
233      const registry = yield* ToolRegistry.Service
234      const firstContexts: Tool.Context[] = []
235      const secondContexts: Tool.Context[] = []
236      const scope = yield* Scope.make()
237      yield* applications.register({ contextual: contextual(firstContexts) })
238      expect((yield* toolDefinitions(registry)).map((tool) => tool.name)).toEqual(["contextual"])
239      yield* applications.register({ contextual: contextual(secondContexts) }).pipe(Scope.provide(scope))
240 
241      yield* settleTool(registry, {
242        sessionID,
243        agent,
244        assistantMessageID,
245        call: { type: "tool-call", id: "call-second", name: "contextual", input: { query: "second" } },
246      })
247      yield* Scope.close(scope, Exit.void)
248      yield* settleTool(registry, {
249        sessionID,
250        agent,
251        assistantMessageID,
252        call: { type: "tool-call", id: "call-first", name: "contextual", input: { query: "first" } },
253      })
254 
255      expect(secondContexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-second" }])
256      expect(firstContexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-first" }])
257    }),
258  )
259 
260  it.effect("keeps the Location tool when an application tool has the same name", () =>
261    Effect.gen(function* () {
262      const applications = yield* ApplicationTools.Service
263      const registry = yield* ToolRegistry.Service
264      const locationContexts: Tool.Context[] = []
265      const applicationContexts: Tool.Context[] = []
266      const location = contextual(locationContexts)
267      yield* registry.register({ shared: location })
268      yield* applications.register({ shared: contextual(applicationContexts) })
269 
270      expect(
271        (yield* toolDefinitions(registry, [{ action: "shared", resource: "*", effect: "deny" }])).map(
272          (definition) => definition.name,
273        ),
274      ).toEqual([])
275      expect(
276        yield* settleTool(registry, {
277          sessionID,
278          agent,
279          assistantMessageID,
280          call: { type: "tool-call", id: "call-shared", name: "shared", input: { query: "location" } },
281        }),
282      ).toMatchObject({ result: { type: "content" } })
283      expect(locationContexts).toEqual([{ sessionID, agent, assistantMessageID, toolCallID: "call-shared" }])
284      expect(applicationContexts).toEqual([])
285    }),
286  )
287})
288