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| 1 | +import { describe, expect, it } from "@effect/vitest"; |
| 2 | +import { Effect } from "effect"; |
| 3 | +import { Client } from "@modelcontextprotocol/sdk/client/index.js"; |
| 4 | +import { InMemoryTransport } from "@modelcontextprotocol/sdk/inMemory.js"; |
| 5 | +import { ElicitRequestSchema } from "@modelcontextprotocol/sdk/types.js"; |
| 6 | + |
| 7 | +import { |
| 8 | + FormElicitation, |
| 9 | + UrlElicitation, |
| 10 | + ElicitationResponse, |
| 11 | + type ElicitationHandler, |
| 12 | + type ElicitationContext, |
| 13 | +} from "@executor/sdk"; |
| 14 | +import type { ExecutionEngine, ExecutionResult, PausedExecution } from "@executor/execution"; |
| 15 | +import type { ExecuteResult } from "@executor/codemode-core"; |
| 16 | + |
| 17 | +import { createExecutorMcpServer } from "./server"; |
| 18 | + |
| 19 | +// --------------------------------------------------------------------------- |
| 20 | +// Helpers — stub engine |
| 21 | +// --------------------------------------------------------------------------- |
| 22 | + |
| 23 | +/** |
| 24 | + * Creates a fake ExecutionEngine where `execute` and `executeWithPause` |
| 25 | + * call into caller-provided functions so each test can control behaviour. |
| 26 | + */ |
| 27 | +const makeStubEngine = (overrides: { |
| 28 | + execute?: ExecutionEngine["execute"]; |
| 29 | + executeWithPause?: ExecutionEngine["executeWithPause"]; |
| 30 | + resume?: ExecutionEngine["resume"]; |
| 31 | + description?: string; |
| 32 | +}): ExecutionEngine => ({ |
| 33 | + execute: overrides.execute ?? (async () => ({ result: "default" })), |
| 34 | + executeWithPause: overrides.executeWithPause ?? |
| 35 | + (async () => ({ status: "completed", result: { result: "default" } })), |
| 36 | + resume: overrides.resume ?? (async () => null), |
| 37 | + getDescription: async () => overrides.description ?? "test executor", |
| 38 | +}); |
| 39 | + |
| 40 | +// --------------------------------------------------------------------------- |
| 41 | +// Helpers — spin up in-memory client ↔ server |
| 42 | +// --------------------------------------------------------------------------- |
| 43 | + |
| 44 | +type TestHarness = { |
| 45 | + client: Client; |
| 46 | + close: () => Promise<void>; |
| 47 | +}; |
| 48 | + |
| 49 | +/** |
| 50 | + * Connect a real MCP Client to our executor MCP server over in-memory |
| 51 | + * transports. The `clientCapabilities` parameter controls whether the |
| 52 | + * client advertises elicitation support. |
| 53 | + */ |
| 54 | +const connect = async ( |
| 55 | + engine: ExecutionEngine, |
| 56 | + clientCapabilities: { elicitation?: { form?: object } } = {}, |
| 57 | +): Promise<TestHarness> => { |
| 58 | + const mcpServer = await createExecutorMcpServer({ engine }); |
| 59 | + const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair(); |
| 60 | + |
| 61 | + const client = new Client( |
| 62 | + { name: "test-client", version: "1.0.0" }, |
| 63 | + { capabilities: clientCapabilities }, |
| 64 | + ); |
| 65 | + |
| 66 | + await mcpServer.connect(serverTransport); |
| 67 | + await client.connect(clientTransport); |
| 68 | + |
| 69 | + return { |
| 70 | + client, |
| 71 | + close: async () => { |
| 72 | + await clientTransport.close(); |
| 73 | + await serverTransport.close(); |
| 74 | + }, |
| 75 | + }; |
| 76 | +}; |
| 77 | + |
| 78 | +// --------------------------------------------------------------------------- |
| 79 | +// Tests — client WITH elicitation support (managed / inline path) |
| 80 | +// --------------------------------------------------------------------------- |
| 81 | + |
| 82 | +describe("MCP host server — client with elicitation", () => { |
| 83 | + it.effect( |
| 84 | + "execute tool calls engine.execute and returns result", |
| 85 | + () => |
| 86 | + Effect.promise(async () => { |
| 87 | + const engine = makeStubEngine({ |
| 88 | + execute: async (code, { onElicitation }) => ({ |
| 89 | + result: `ran: ${code}`, |
| 90 | + }), |
| 91 | + }); |
| 92 | + |
| 93 | + const { client, close } = await connect(engine, { |
| 94 | + elicitation: { form: {} }, |
| 95 | + }); |
| 96 | + |
| 97 | + try { |
| 98 | + const result = await client.callTool({ name: "execute", arguments: { code: "1+1" } }); |
| 99 | + expect(result.content).toEqual([{ type: "text", text: "ran: 1+1" }]); |
| 100 | + expect(result.isError).toBeFalsy(); |
| 101 | + } finally { |
| 102 | + await close(); |
| 103 | + } |
| 104 | + }), |
| 105 | + ); |
| 106 | + |
| 107 | + it.effect( |
| 108 | + "form elicitation is bridged from engine to MCP client and back", |
| 109 | + () => |
| 110 | + Effect.promise(async () => { |
| 111 | + const engine = makeStubEngine({ |
| 112 | + execute: async (code, { onElicitation }) => { |
| 113 | + const response = await Effect.runPromise( |
| 114 | + onElicitation({ |
| 115 | + toolId: "test-tool" as any, |
| 116 | + args: { code }, |
| 117 | + request: new FormElicitation({ |
| 118 | + message: "Approve this action?", |
| 119 | + requestedSchema: { |
| 120 | + type: "object", |
| 121 | + properties: { |
| 122 | + approved: { type: "boolean" }, |
| 123 | + }, |
| 124 | + }, |
| 125 | + }), |
| 126 | + }), |
| 127 | + ); |
| 128 | + return { |
| 129 | + result: |
| 130 | + response.action === "accept" && response.content?.approved |
| 131 | + ? "approved" |
| 132 | + : "denied", |
| 133 | + }; |
| 134 | + }, |
| 135 | + }); |
| 136 | + |
| 137 | + const { client, close } = await connect(engine, { |
| 138 | + elicitation: { form: {} }, |
| 139 | + }); |
| 140 | + |
| 141 | + // Register a client-side handler that auto-accepts |
| 142 | + client.setRequestHandler(ElicitRequestSchema, async (request) => ({ |
| 143 | + action: "accept" as const, |
| 144 | + content: { approved: true }, |
| 145 | + })); |
| 146 | + |
| 147 | + try { |
| 148 | + const result = await client.callTool({ |
| 149 | + name: "execute", |
| 150 | + arguments: { code: "do-it" }, |
| 151 | + }); |
| 152 | + expect(result.content).toEqual([{ type: "text", text: "approved" }]); |
| 153 | + } finally { |
| 154 | + await close(); |
| 155 | + } |
| 156 | + }), |
| 157 | + ); |
| 158 | + |
| 159 | + it.effect( |
| 160 | + "form elicitation declined by client → engine sees decline", |
| 161 | + () => |
| 162 | + Effect.promise(async () => { |
| 163 | + const engine = makeStubEngine({ |
| 164 | + execute: async (code, { onElicitation }) => { |
| 165 | + const response = await Effect.runPromise( |
| 166 | + onElicitation({ |
| 167 | + toolId: "t" as any, |
| 168 | + args: {}, |
| 169 | + request: new FormElicitation({ |
| 170 | + message: "Accept?", |
| 171 | + requestedSchema: {}, |
| 172 | + }), |
| 173 | + }), |
| 174 | + ); |
| 175 | + return { result: `action:${response.action}` }; |
| 176 | + }, |
| 177 | + }); |
| 178 | + |
| 179 | + const { client, close } = await connect(engine, { |
| 180 | + elicitation: { form: {} }, |
| 181 | + }); |
| 182 | + |
| 183 | + client.setRequestHandler(ElicitRequestSchema, async () => ({ |
| 184 | + action: "decline" as const, |
| 185 | + content: {}, |
| 186 | + })); |
| 187 | + |
| 188 | + try { |
| 189 | + const result = await client.callTool({ |
| 190 | + name: "execute", |
| 191 | + arguments: { code: "x" }, |
| 192 | + }); |
| 193 | + expect(result.content).toEqual([ |
| 194 | + { type: "text", text: "action:decline" }, |
| 195 | + ]); |
| 196 | + } finally { |
| 197 | + await close(); |
| 198 | + } |
| 199 | + }), |
| 200 | + ); |
| 201 | + |
| 202 | + it.effect( |
| 203 | + "empty form schema gets wrapped with minimal valid schema", |
| 204 | + () => |
| 205 | + Effect.promise(async () => { |
| 206 | + let receivedSchema: unknown; |
| 207 | + |
| 208 | + const engine = makeStubEngine({ |
| 209 | + execute: async (_code, { onElicitation }) => { |
| 210 | + const response = await Effect.runPromise( |
| 211 | + onElicitation({ |
| 212 | + toolId: "t" as any, |
| 213 | + args: {}, |
| 214 | + request: new FormElicitation({ |
| 215 | + message: "Just approve", |
| 216 | + requestedSchema: {}, // empty — approval only |
| 217 | + }), |
| 218 | + }), |
| 219 | + ); |
| 220 | + return { result: response.action }; |
| 221 | + }, |
| 222 | + }); |
| 223 | + |
| 224 | + const { client, close } = await connect(engine, { |
| 225 | + elicitation: { form: {} }, |
| 226 | + }); |
| 227 | + |
| 228 | + client.setRequestHandler(ElicitRequestSchema, async (request) => { |
| 229 | + receivedSchema = request.params.requestedSchema; |
| 230 | + return { action: "accept" as const, content: {} }; |
| 231 | + }); |
| 232 | + |
| 233 | + try { |
| 234 | + await client.callTool({ |
| 235 | + name: "execute", |
| 236 | + arguments: { code: "approve" }, |
| 237 | + }); |
| 238 | + expect(receivedSchema).toEqual({ |
| 239 | + type: "object", |
| 240 | + properties: {}, |
| 241 | + }); |
| 242 | + } finally { |
| 243 | + await close(); |
| 244 | + } |
| 245 | + }), |
| 246 | + ); |
| 247 | + |
| 248 | + it.effect( |
| 249 | + "UrlElicitation is converted to a form with _url_hint property", |
| 250 | + () => |
| 251 | + Effect.promise(async () => { |
| 252 | + let receivedMessage: string | undefined; |
| 253 | + let receivedSchema: Record<string, unknown> | undefined; |
| 254 | + |
| 255 | + const engine = makeStubEngine({ |
| 256 | + execute: async (_code, { onElicitation }) => { |
| 257 | + const response = await Effect.runPromise( |
| 258 | + onElicitation({ |
| 259 | + toolId: "t" as any, |
| 260 | + args: {}, |
| 261 | + request: new UrlElicitation({ |
| 262 | + message: "Please authenticate", |
| 263 | + url: "https://example.com/oauth", |
| 264 | + elicitationId: "elic-1", |
| 265 | + }), |
| 266 | + }), |
| 267 | + ); |
| 268 | + return { result: response.action }; |
| 269 | + }, |
| 270 | + }); |
| 271 | + |
| 272 | + const { client, close } = await connect(engine, { |
| 273 | + elicitation: { form: {} }, |
| 274 | + }); |
| 275 | + |
| 276 | + client.setRequestHandler(ElicitRequestSchema, async (request) => { |
| 277 | + receivedMessage = request.params.message; |
| 278 | + receivedSchema = request.params.requestedSchema as Record< |
| 279 | + string, |
| 280 | + unknown |
| 281 | + >; |
| 282 | + return { action: "accept" as const, content: {} }; |
| 283 | + }); |
| 284 | + |
| 285 | + try { |
| 286 | + await client.callTool({ |
| 287 | + name: "execute", |
| 288 | + arguments: { code: "oauth" }, |
| 289 | + }); |
| 290 | + expect(receivedMessage).toBe("Please authenticate"); |
| 291 | + expect(receivedSchema).toEqual({ |
| 292 | + type: "object", |
| 293 | + properties: { |
| 294 | + _url_hint: { |
| 295 | + type: "string", |
| 296 | + description: |
| 297 | + "Please open this URL: https://example.com/oauth", |
| 298 | + default: "https://example.com/oauth", |
| 299 | + }, |
| 300 | + }, |
| 301 | + }); |
| 302 | + } finally { |
| 303 | + await close(); |
| 304 | + } |
| 305 | + }), |
| 306 | + ); |
| 307 | + |
| 308 | + it.effect( |
| 309 | + "engine error is surfaced as isError result", |
| 310 | + () => |
| 311 | + Effect.promise(async () => { |
| 312 | + const engine = makeStubEngine({ |
| 313 | + execute: async () => ({ |
| 314 | + result: null, |
| 315 | + error: "something broke", |
| 316 | + logs: ["log1"], |
| 317 | + }), |
| 318 | + }); |
| 319 | + |
| 320 | + const { client, close } = await connect(engine, { |
| 321 | + elicitation: { form: {} }, |
| 322 | + }); |
| 323 | + |
| 324 | + try { |
| 325 | + const result = await client.callTool({ |
| 326 | + name: "execute", |
| 327 | + arguments: { code: "bad" }, |
| 328 | + }); |
| 329 | + expect(result.isError).toBe(true); |
| 330 | + const text = (result.content as any)[0].text; |
| 331 | + expect(text).toContain("something broke"); |
| 332 | + } finally { |
| 333 | + await close(); |
| 334 | + } |
| 335 | + }), |
| 336 | + ); |
| 337 | + |
| 338 | + it.effect( |
| 339 | + "resume tool is hidden when client supports elicitation", |
| 340 | + () => |
| 341 | + Effect.promise(async () => { |
| 342 | + const engine = makeStubEngine({}); |
| 343 | + const { client, close } = await connect(engine, { |
| 344 | + elicitation: { form: {} }, |
| 345 | + }); |
| 346 | + |
| 347 | + try { |
| 348 | + const { tools } = await client.listTools(); |
| 349 | + const names = tools.map((t) => t.name); |
| 350 | + expect(names).toContain("execute"); |
| 351 | + expect(names).not.toContain("resume"); |
| 352 | + } finally { |
| 353 | + await close(); |
| 354 | + } |
| 355 | + }), |
| 356 | + ); |
| 357 | +}); |
| 358 | + |
| 359 | +// --------------------------------------------------------------------------- |
| 360 | +// Tests — client WITHOUT elicitation (pause/resume path) |
| 361 | +// --------------------------------------------------------------------------- |
| 362 | + |
| 363 | +describe("MCP host server — client without elicitation (pause/resume)", () => { |
| 364 | + it.effect( |
| 365 | + "completed execution returns result directly", |
| 366 | + () => |
| 367 | + Effect.promise(async () => { |
| 368 | + const engine = makeStubEngine({ |
| 369 | + executeWithPause: async () => ({ |
| 370 | + status: "completed", |
| 371 | + result: { result: "done" }, |
| 372 | + }), |
| 373 | + }); |
| 374 | + |
| 375 | + const { client, close } = await connect(engine); |
| 376 | + |
| 377 | + try { |
| 378 | + const result = await client.callTool({ |
| 379 | + name: "execute", |
| 380 | + arguments: { code: "ok" }, |
| 381 | + }); |
| 382 | + expect(result.content).toEqual([{ type: "text", text: "done" }]); |
| 383 | + expect(result.isError).toBeFalsy(); |
| 384 | + } finally { |
| 385 | + await close(); |
| 386 | + } |
| 387 | + }), |
| 388 | + ); |
| 389 | + |
| 390 | + it.effect( |
| 391 | + "both execute and resume tools are visible", |
| 392 | + () => |
| 393 | + Effect.promise(async () => { |
| 394 | + const engine = makeStubEngine({}); |
| 395 | + const { client, close } = await connect(engine); |
| 396 | + |
| 397 | + try { |
| 398 | + const { tools } = await client.listTools(); |
| 399 | + const names = tools.map((t) => t.name); |
| 400 | + expect(names).toContain("execute"); |
| 401 | + expect(names).toContain("resume"); |
| 402 | + } finally { |
| 403 | + await close(); |
| 404 | + } |
| 405 | + }), |
| 406 | + ); |
| 407 | + |
| 408 | + it.effect( |
| 409 | + "paused execution returns interaction metadata with executionId", |
| 410 | + () => |
| 411 | + Effect.promise(async () => { |
| 412 | + const engine = makeStubEngine({ |
| 413 | + executeWithPause: async (): Promise<ExecutionResult> => ({ |
| 414 | + status: "paused", |
| 415 | + execution: { |
| 416 | + id: "exec_42", |
| 417 | + elicitationContext: { |
| 418 | + toolId: "t" as any, |
| 419 | + args: {}, |
| 420 | + request: new FormElicitation({ |
| 421 | + message: "Need approval", |
| 422 | + requestedSchema: { |
| 423 | + type: "object", |
| 424 | + properties: { ok: { type: "boolean" } }, |
| 425 | + }, |
| 426 | + }), |
| 427 | + }, |
| 428 | + resolve: () => {}, |
| 429 | + completion: new Promise(() => {}), // never resolves in this test |
| 430 | + }, |
| 431 | + }), |
| 432 | + }); |
| 433 | + |
| 434 | + const { client, close } = await connect(engine); |
| 435 | + |
| 436 | + try { |
| 437 | + const result = await client.callTool({ |
| 438 | + name: "execute", |
| 439 | + arguments: { code: "pause-me" }, |
| 440 | + }); |
| 441 | + const text = (result.content as any)[0].text as string; |
| 442 | + expect(text).toContain("exec_42"); |
| 443 | + expect(text).toContain("Need approval"); |
| 444 | + expect(result.isError).toBeFalsy(); |
| 445 | + |
| 446 | + // structuredContent should contain the executionId |
| 447 | + expect((result as any).structuredContent?.executionId).toBe("exec_42"); |
| 448 | + expect((result as any).structuredContent?.status).toBe( |
| 449 | + "waiting_for_interaction", |
| 450 | + ); |
| 451 | + } finally { |
| 452 | + await close(); |
| 453 | + } |
| 454 | + }), |
| 455 | + ); |
| 456 | + |
| 457 | + it.effect( |
| 458 | + "resume tool completes a paused execution", |
| 459 | + () => |
| 460 | + Effect.promise(async () => { |
| 461 | + const engine = makeStubEngine({ |
| 462 | + resume: async (executionId, response) => { |
| 463 | + if (executionId === "exec_1" && response.action === "accept") { |
| 464 | + return { result: "resumed-ok" }; |
| 465 | + } |
| 466 | + return null; |
| 467 | + }, |
| 468 | + }); |
| 469 | + |
| 470 | + const { client, close } = await connect(engine); |
| 471 | + |
| 472 | + try { |
| 473 | + const result = await client.callTool({ |
| 474 | + name: "resume", |
| 475 | + arguments: { |
| 476 | + executionId: "exec_1", |
| 477 | + action: "accept", |
| 478 | + content: "{}", |
| 479 | + }, |
| 480 | + }); |
| 481 | + expect(result.content).toEqual([ |
| 482 | + { type: "text", text: "resumed-ok" }, |
| 483 | + ]); |
| 484 | + expect(result.isError).toBeFalsy(); |
| 485 | + } finally { |
| 486 | + await close(); |
| 487 | + } |
| 488 | + }), |
| 489 | + ); |
| 490 | + |
| 491 | + it.effect( |
| 492 | + "resume tool passes parsed content to engine", |
| 493 | + () => |
| 494 | + Effect.promise(async () => { |
| 495 | + let receivedContent: Record<string, unknown> | undefined; |
| 496 | + |
| 497 | + const engine = makeStubEngine({ |
| 498 | + resume: async (_id, response) => { |
| 499 | + receivedContent = response.content; |
| 500 | + return { result: "ok" }; |
| 501 | + }, |
| 502 | + }); |
| 503 | + |
| 504 | + const { client, close } = await connect(engine); |
| 505 | + |
| 506 | + try { |
| 507 | + await client.callTool({ |
| 508 | + name: "resume", |
| 509 | + arguments: { |
| 510 | + executionId: "exec_1", |
| 511 | + action: "accept", |
| 512 | + content: JSON.stringify({ approved: true, name: "test" }), |
| 513 | + }, |
| 514 | + }); |
| 515 | + expect(receivedContent).toEqual({ approved: true, name: "test" }); |
| 516 | + } finally { |
| 517 | + await close(); |
| 518 | + } |
| 519 | + }), |
| 520 | + ); |
| 521 | + |
| 522 | + it.effect( |
| 523 | + "resume with empty content passes undefined", |
| 524 | + () => |
| 525 | + Effect.promise(async () => { |
| 526 | + let receivedContent: Record<string, unknown> | undefined = { marker: true }; |
| 527 | + |
| 528 | + const engine = makeStubEngine({ |
| 529 | + resume: async (_id, response) => { |
| 530 | + receivedContent = response.content; |
| 531 | + return { result: "ok" }; |
| 532 | + }, |
| 533 | + }); |
| 534 | + |
| 535 | + const { client, close } = await connect(engine); |
| 536 | + |
| 537 | + try { |
| 538 | + await client.callTool({ |
| 539 | + name: "resume", |
| 540 | + arguments: { |
| 541 | + executionId: "exec_1", |
| 542 | + action: "accept", |
| 543 | + content: "{}", |
| 544 | + }, |
| 545 | + }); |
| 546 | + expect(receivedContent).toBeUndefined(); |
| 547 | + } finally { |
| 548 | + await close(); |
| 549 | + } |
| 550 | + }), |
| 551 | + ); |
| 552 | + |
| 553 | + it.effect( |
| 554 | + "resume with unknown executionId returns error", |
| 555 | + () => |
| 556 | + Effect.promise(async () => { |
| 557 | + const engine = makeStubEngine({ |
| 558 | + resume: async () => null, |
| 559 | + }); |
| 560 | + |
| 561 | + const { client, close } = await connect(engine); |
| 562 | + |
| 563 | + try { |
| 564 | + const result = await client.callTool({ |
| 565 | + name: "resume", |
| 566 | + arguments: { |
| 567 | + executionId: "does-not-exist", |
| 568 | + action: "accept", |
| 569 | + content: "{}", |
| 570 | + }, |
| 571 | + }); |
| 572 | + expect(result.isError).toBe(true); |
| 573 | + const text = (result.content as any)[0].text; |
| 574 | + expect(text).toContain("does-not-exist"); |
| 575 | + } finally { |
| 576 | + await close(); |
| 577 | + } |
| 578 | + }), |
| 579 | + ); |
| 580 | + |
| 581 | + it.effect( |
| 582 | + "paused UrlElicitation includes url and kind in structured output", |
| 583 | + () => |
| 584 | + Effect.promise(async () => { |
| 585 | + const engine = makeStubEngine({ |
| 586 | + executeWithPause: async (): Promise<ExecutionResult> => ({ |
| 587 | + status: "paused", |
| 588 | + execution: { |
| 589 | + id: "exec_99", |
| 590 | + elicitationContext: { |
| 591 | + toolId: "t" as any, |
| 592 | + args: {}, |
| 593 | + request: new UrlElicitation({ |
| 594 | + message: "Please authenticate", |
| 595 | + url: "https://auth.example.com/callback", |
| 596 | + elicitationId: "elic-url-1", |
| 597 | + }), |
| 598 | + }, |
| 599 | + resolve: () => {}, |
| 600 | + completion: new Promise(() => {}), |
| 601 | + }, |
| 602 | + }), |
| 603 | + }); |
| 604 | + |
| 605 | + const { client, close } = await connect(engine); |
| 606 | + |
| 607 | + try { |
| 608 | + const result = await client.callTool({ |
| 609 | + name: "execute", |
| 610 | + arguments: { code: "oauth" }, |
| 611 | + }); |
| 612 | + const text = (result.content as any)[0].text as string; |
| 613 | + expect(text).toContain("https://auth.example.com/callback"); |
| 614 | + expect(text).toContain("exec_99"); |
| 615 | + |
| 616 | + const structured = (result as any).structuredContent; |
| 617 | + expect(structured?.interaction?.kind).toBe("url"); |
| 618 | + expect(structured?.interaction?.url).toBe( |
| 619 | + "https://auth.example.com/callback", |
| 620 | + ); |
| 621 | + } finally { |
| 622 | + await close(); |
| 623 | + } |
| 624 | + }), |
| 625 | + ); |
| 626 | +}); |
| 627 | + |
| 628 | +// --------------------------------------------------------------------------- |
| 629 | +// Tests — elicitation error handling |
| 630 | +// --------------------------------------------------------------------------- |
| 631 | + |
| 632 | +describe("MCP host server — elicitation error handling", () => { |
| 633 | + it.effect( |
| 634 | + "elicitInput failure falls back to cancel", |
| 635 | + () => |
| 636 | + Effect.promise(async () => { |
| 637 | + const engine = makeStubEngine({ |
| 638 | + execute: async (_code, { onElicitation }) => { |
| 639 | + const response = await Effect.runPromise( |
| 640 | + onElicitation({ |
| 641 | + toolId: "t" as any, |
| 642 | + args: {}, |
| 643 | + request: new FormElicitation({ |
| 644 | + message: "will fail", |
| 645 | + requestedSchema: { |
| 646 | + type: "object", |
| 647 | + properties: { x: { type: "string" } }, |
| 648 | + }, |
| 649 | + }), |
| 650 | + }), |
| 651 | + ); |
| 652 | + return { result: `fallback:${response.action}` }; |
| 653 | + }, |
| 654 | + }); |
| 655 | + |
| 656 | + const { client, close } = await connect(engine, { |
| 657 | + elicitation: { form: {} }, |
| 658 | + }); |
| 659 | + |
| 660 | + // Don't register any handler — the client will reject with an error |
| 661 | + // when it receives an elicitation request it can't handle. |
| 662 | + // But the MCP SDK might auto-handle... let's explicitly throw. |
| 663 | + client.setRequestHandler(ElicitRequestSchema, async () => { |
| 664 | + throw new Error("client cannot handle this"); |
| 665 | + }); |
| 666 | + |
| 667 | + try { |
| 668 | + const result = await client.callTool({ |
| 669 | + name: "execute", |
| 670 | + arguments: { code: "fail" }, |
| 671 | + }); |
| 672 | + // The server catches the error and returns cancel |
| 673 | + expect(result.content).toEqual([ |
| 674 | + { type: "text", text: "fallback:cancel" }, |
| 675 | + ]); |
| 676 | + } finally { |
| 677 | + await close(); |
| 678 | + } |
| 679 | + }), |
| 680 | + ); |
| 681 | +}); |
| 682 | + |
| 683 | +// --------------------------------------------------------------------------- |
| 684 | +// Tests — parseJsonContent edge cases |
| 685 | +// --------------------------------------------------------------------------- |
| 686 | + |
| 687 | +describe("MCP host server — resume content parsing", () => { |
| 688 | + it.effect( |
| 689 | + "array JSON is rejected (not passed as content)", |
| 690 | + () => |
| 691 | + Effect.promise(async () => { |
| 692 | + let receivedContent: Record<string, unknown> | undefined = { marker: true }; |
| 693 | + |
| 694 | + const engine = makeStubEngine({ |
| 695 | + resume: async (_id, response) => { |
| 696 | + receivedContent = response.content; |
| 697 | + return { result: "ok" }; |
| 698 | + }, |
| 699 | + }); |
| 700 | + |
| 701 | + const { client, close } = await connect(engine); |
| 702 | + |
| 703 | + try { |
| 704 | + await client.callTool({ |
| 705 | + name: "resume", |
| 706 | + arguments: { |
| 707 | + executionId: "exec_1", |
| 708 | + action: "accept", |
| 709 | + content: "[1,2,3]", |
| 710 | + }, |
| 711 | + }); |
| 712 | + // Array should be rejected — engine receives undefined |
| 713 | + expect(receivedContent).toBeUndefined(); |
| 714 | + } finally { |
| 715 | + await close(); |
| 716 | + } |
| 717 | + }), |
| 718 | + ); |
| 719 | + |
| 720 | + it.effect( |
| 721 | + "invalid JSON is handled gracefully (not thrown)", |
| 722 | + () => |
| 723 | + Effect.promise(async () => { |
| 724 | + let receivedContent: Record<string, unknown> | undefined = { marker: true }; |
| 725 | + |
| 726 | + const engine = makeStubEngine({ |
| 727 | + resume: async (_id, response) => { |
| 728 | + receivedContent = response.content; |
| 729 | + return { result: "ok" }; |
| 730 | + }, |
| 731 | + }); |
| 732 | + |
| 733 | + const { client, close } = await connect(engine); |
| 734 | + |
| 735 | + try { |
| 736 | + const result = await client.callTool({ |
| 737 | + name: "resume", |
| 738 | + arguments: { |
| 739 | + executionId: "exec_1", |
| 740 | + action: "accept", |
| 741 | + content: "not-valid-json", |
| 742 | + }, |
| 743 | + }); |
| 744 | + // Should not crash — invalid JSON treated as undefined content |
| 745 | + expect(receivedContent).toBeUndefined(); |
| 746 | + expect(result.isError).toBeFalsy(); |
| 747 | + } finally { |
| 748 | + await close(); |
| 749 | + } |
| 750 | + }), |
| 751 | + ); |
| 752 | +}); |
| 753 | + |
| 754 | +// --------------------------------------------------------------------------- |
| 755 | +// Tests — multiple elicitations in a single execution |
| 756 | +// --------------------------------------------------------------------------- |
| 757 | + |
| 758 | +describe("MCP host server — multiple elicitations", () => { |
| 759 | + it.effect( |
| 760 | + "engine can elicit multiple times during a single execute call", |
| 761 | + () => |
| 762 | + Effect.promise(async () => { |
| 763 | + const engine = makeStubEngine({ |
| 764 | + execute: async (_code, { onElicitation }) => { |
| 765 | + // First elicitation — ask for name |
| 766 | + const r1 = await Effect.runPromise( |
| 767 | + onElicitation({ |
| 768 | + toolId: "t" as any, |
| 769 | + args: {}, |
| 770 | + request: new FormElicitation({ |
| 771 | + message: "What is your name?", |
| 772 | + requestedSchema: { |
| 773 | + type: "object", |
| 774 | + properties: { name: { type: "string" } }, |
| 775 | + }, |
| 776 | + }), |
| 777 | + }), |
| 778 | + ); |
| 779 | + |
| 780 | + // Second elicitation — ask for confirmation |
| 781 | + const r2 = await Effect.runPromise( |
| 782 | + onElicitation({ |
| 783 | + toolId: "t" as any, |
| 784 | + args: {}, |
| 785 | + request: new FormElicitation({ |
| 786 | + message: `Confirm: ${r1.content?.name}?`, |
| 787 | + requestedSchema: { |
| 788 | + type: "object", |
| 789 | + properties: { confirmed: { type: "boolean" } }, |
| 790 | + }, |
| 791 | + }), |
| 792 | + }), |
| 793 | + ); |
| 794 | + |
| 795 | + return { |
| 796 | + result: `name=${r1.content?.name},confirmed=${r2.content?.confirmed}`, |
| 797 | + }; |
| 798 | + }, |
| 799 | + }); |
| 800 | + |
| 801 | + const { client, close } = await connect(engine, { |
| 802 | + elicitation: { form: {} }, |
| 803 | + }); |
| 804 | + |
| 805 | + let callCount = 0; |
| 806 | + client.setRequestHandler(ElicitRequestSchema, async (request) => { |
| 807 | + callCount++; |
| 808 | + if (callCount === 1) { |
| 809 | + return { action: "accept" as const, content: { name: "Alice" } }; |
| 810 | + } |
| 811 | + return { action: "accept" as const, content: { confirmed: true } }; |
| 812 | + }); |
| 813 | + |
| 814 | + try { |
| 815 | + const result = await client.callTool({ |
| 816 | + name: "execute", |
| 817 | + arguments: { code: "multi" }, |
| 818 | + }); |
| 819 | + expect(result.content).toEqual([ |
| 820 | + { type: "text", text: "name=Alice,confirmed=true" }, |
| 821 | + ]); |
| 822 | + expect(callCount).toBe(2); |
| 823 | + } finally { |
| 824 | + await close(); |
| 825 | + } |
| 826 | + }), |
| 827 | + ); |
| 828 | +}); |