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fix(terminal): move execution.read() into onDidStartTerminalShellExecution to fix cold-terminal zero-chunk output loss
1 parent 12921f1 commit ae04745

17 files changed

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{
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"fixtures": [
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{
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"match": {
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"userMessage": "COLD_SHELL_INIT_E2E"
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},
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"response": {
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"toolCalls": [
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{
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"name": "execute_command",
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"arguments": "{\"command\":\"python3 -c \\\"\\nimport sys\\nprint('cold-init-ok', file=sys.stdout)\\nsys.exit(0)\\n\\\"\"}",
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"id": "call_cold_shell_init_001"
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}
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]
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}
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}
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]
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}
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{
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"fixtures": [
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{
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"match": {
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"userMessage": "LONG_RUNNING_SILENT_COMMAND_E2E"
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},
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"response": {
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"toolCalls": [
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{
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"name": "execute_command",
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"arguments": "{\"command\":\"sleep 5\"}",
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"id": "call_long_running_silent_001"
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}
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]
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}
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}
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]
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}
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{
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"fixtures": [
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{
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"match": {
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"userMessage": "TERMINAL_REUSE_SHELL_RACE_E2E"
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},
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"response": {
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"toolCalls": [
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{
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"name": "execute_command",
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"arguments": "{\"command\":\"python3 -c \\\"\\nimport sys\\nprint('first', file=sys.stderr)\\nsys.exit(0)\\n\\\"\"}",
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"id": "call_terminal_reuse_001"
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}
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]
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}
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}
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]
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}
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{
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"fixtures": [
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{
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"match": {
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"userMessage": "ZERO_CHUNK_SHELL_RACE_E2E"
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},
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"response": {
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"toolCalls": [
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{
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"name": "execute_command",
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"arguments": "{\"command\":\"python3 -c \\\"\\nimport sys\\nprint('boom', file=sys.stderr)\\nsys.exit(1)\\n\\\"\"}",
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"id": "call_zero_chunk_shell_race_001"
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}
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]
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}
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}
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]
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}
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import type { ChatCompletionRequest, ChatMessage } from "@copilotkit/aimock"
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import { LLMock } from "@copilotkit/aimock"
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function anyToolResultContains(req: ChatCompletionRequest, ...terms: string[]): boolean {
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const messages: ChatMessage[] = Array.isArray(req?.messages) ? req.messages : []
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return messages.some(
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(msg) =>
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msg?.role === "tool" &&
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typeof msg.content === "string" &&
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terms.every((t) => (msg.content as string).includes(t)),
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)
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}
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export function addColdShellInitFixtures(mock: InstanceType<typeof LLMock>) {
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// On cold zsh terminals the first execution may produce 0 chunks (VSCode
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// execution.read() limitation on basic shell integration — see issue #242897).
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// When the first result is empty, the mock retries the same command so the
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// second attempt (on the now-warm terminal) captures real output.
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mock.addFixture({
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match: {
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toolCallId: "call_cold_shell_init_001",
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predicate: (req: ChatCompletionRequest) =>
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// First attempt returned empty — retry the command
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!anyToolResultContains(req, "cold-init-ok"),
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},
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response: {
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toolCalls: [
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{
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name: "execute_command",
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arguments: JSON.stringify({
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command: "python3 -c \"\nimport sys\nprint('cold-init-ok', file=sys.stdout)\nsys.exit(0)\n\"",
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}),
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id: "call_cold_shell_init_003",
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},
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],
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},
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})
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// Match whichever attempt (first or retry) delivers real output — prove
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// the guard kept the process alive long enough for the output to arrive.
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mock.addFixture({
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match: {
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predicate: (req: ChatCompletionRequest) => anyToolResultContains(req, "cold-init-ok", "Exit code: 0"),
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},
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response: {
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toolCalls: [
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{
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name: "attempt_completion",
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arguments: JSON.stringify({ result: "Cold shell init command completed with real output." }),
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id: "call_cold_shell_init_002",
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},
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],
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},
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})
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}
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import { LLMock } from "@copilotkit/aimock"
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import { toolResultContains } from "./tool-result"
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export function addLongRuningSilentCommandFixtures(mock: InstanceType<typeof LLMock>) {
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// `sleep 5` produces no output and completes normally via onDidEndTerminalShellExecution.
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// The idle timeout must NOT fire here — it must only fire on zero-chunk commands where
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// the stream stays open AND the event is delayed (the { ... }-wrapped multiline bug).
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// For `sleep 5`, the stream stays open (so the idle timer is never active after the
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// first chunk — but actually sleep 5 may produce no chunks either). The distinction
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// is that `sleep 5` DOES receive onDidEndTerminalShellExecution promptly after exit,
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// which breaks the loop via DONE_SENTINEL before the 3s idle timer fires.
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mock.addFixture({
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match: {
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toolCallId: "call_long_running_silent_001",
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predicate: (req) =>
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toolResultContains(req, "call_long_running_silent_001", [
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// sleep exits with code 0 — the normal exit status path
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"Exit code: 0",
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]),
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},
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response: {
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toolCalls: [
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{
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name: "attempt_completion",
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arguments: JSON.stringify({ result: "The sleep command completed successfully." }),
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id: "call_long_running_silent_002",
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},
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],
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},
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})
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}
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import { LLMock } from "@copilotkit/aimock"
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import { toolResultContains } from "./tool-result"
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export function addTerminalReuseShellRaceFixtures(mock: InstanceType<typeof LLMock>) {
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// First command completes — model issues a second command on the same terminal.
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// With the temp-script fix, both commands now deliver real output.
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mock.addFixture({
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match: {
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toolCallId: "call_terminal_reuse_001",
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predicate: (req) => toolResultContains(req, "call_terminal_reuse_001", ["first", "Exit code: 0"]),
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},
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response: {
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toolCalls: [
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{
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name: "execute_command",
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arguments: JSON.stringify({
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command: "python3 -c \"\nimport sys\nprint('second', file=sys.stderr)\nsys.exit(0)\n\"",
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}),
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id: "call_terminal_reuse_002",
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},
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],
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},
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})
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// Second command on the reused terminal also completes.
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mock.addFixture({
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match: {
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toolCallId: "call_terminal_reuse_002",
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predicate: (req) => toolResultContains(req, "call_terminal_reuse_002", ["second", "Exit code: 0"]),
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},
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response: {
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toolCalls: [
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{
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name: "attempt_completion",
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arguments: JSON.stringify({ result: "Both commands ran on the reused terminal." }),
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id: "call_terminal_reuse_003",
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},
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],
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},
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})
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}
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import { LLMock } from "@copilotkit/aimock"
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import { toolResultContains } from "./tool-result"
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export function addZeroChunkShellRaceResultFixtures(mock: InstanceType<typeof LLMock>) {
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mock.addFixture({
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match: {
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toolCallId: "call_zero_chunk_shell_race_001",
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// The multiline command is now written to a temp script file and executed
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// via `sh /tmp/roo-cmd-*.sh` to avoid the VSCode { ... }-wrapping bug that
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// caused the stream to be closed before read() arrived (zero chunks).
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// The real output ('boom' on stderr) and exit code (1) now reach the model.
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predicate: (req) => toolResultContains(req, "call_zero_chunk_shell_race_001", ["boom", "Exit code: 1"]),
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},
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response: {
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toolCalls: [
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{
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name: "attempt_completion",
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arguments: JSON.stringify({ result: "The script ran and printed 'boom' to stderr." }),
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id: "call_zero_chunk_shell_race_002",
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},
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],
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},
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})
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}

apps/vscode-e2e/src/runTest.ts

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@@ -9,6 +9,10 @@ import { LLMock } from "@copilotkit/aimock"
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import { addApplyDiffResultFixtures } from "./fixtures/apply-diff"
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import { addExecuteCommandResultFixtures } from "./fixtures/execute-command"
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import { addFastExitShellRaceResultFixtures } from "./fixtures/fast-exit-shell-race"
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import { addZeroChunkShellRaceResultFixtures } from "./fixtures/zero-chunk-shell-race"
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import { addTerminalReuseShellRaceFixtures } from "./fixtures/terminal-reuse-shell-race"
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import { addLongRuningSilentCommandFixtures } from "./fixtures/long-running-silent-command"
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import { addColdShellInitFixtures } from "./fixtures/cold-shell-init"
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import { addTerminalProfileResultFixtures } from "./fixtures/terminal-profile"
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import { addListFilesResultFixtures } from "./fixtures/list-files"
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import { addReadFileResultFixtures } from "./fixtures/read-file"
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addApplyDiffResultFixtures(mock)
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addExecuteCommandResultFixtures(mock)
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addFastExitShellRaceResultFixtures(mock)
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addZeroChunkShellRaceResultFixtures(mock)
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addTerminalReuseShellRaceFixtures(mock)
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addLongRuningSilentCommandFixtures(mock)
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addColdShellInitFixtures(mock)
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addTerminalProfileResultFixtures(mock)
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addListFilesResultFixtures(mock)
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addReadFileResultFixtures(mock)
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/**
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* Regression guard for the idle-timeout-during-shell-initialization race:
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* on a cold terminal, onDidStartTerminalShellExecution can fire AFTER the
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* 3-second idle window. Without the guard added in TerminalProcess.run(),
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* the IDLE_SENTINEL path self-finalizes before the command starts executing,
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* silently dropping its output.
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*
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* The fix: when IDLE_SENTINEL fires but the shell_execution_started event has
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* not been received, continue waiting (re-arm the idle timer) up to
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* Shell Integration Timeout ms. Only self-finalize once the event has arrived
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* OR the full timeout is exhausted.
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*
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* NOTE on cold-zsh first-command zero-chunks: VSCode's execution.read() API
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* has known reliability issues on "basic" shell integration (documented in
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* https://github.com/microsoft/vscode/issues/242897). On a cold zsh terminal
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* the very first command may produce zero stream chunks even though the
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* command ran successfully — this is a VSCode API limitation, not a Zoo Code
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* bug. The model typically retries and captures output on the second attempt
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* (warm terminal). This test verifies the guard prevents a PREMATURE
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* self-finalize and that the model eventually receives "cold-init-ok" output
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* (either on the first or a retry attempt).
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*
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* See: https://github.com/Zoo-Code-Org/Zoo-Code/issues/800
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*/
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import * as assert from "assert"
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import { RooCodeEventName, type ClineMessage } from "@roo-code/types"
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import { waitUntilCompleted } from "../utils"
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import { setDefaultSuiteTimeout } from "../test-utils"
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suite("Cold shell init — idle timeout must not misfire before shell starts", function () {
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if (process.platform !== "linux") {
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return
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}
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setDefaultSuiteTimeout(this)
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setup(async () => {
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try {
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await globalThis.api.cancelCurrentTask()
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} catch {
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// task may not be running
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}
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})
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teardown(async () => {
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try {
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await globalThis.api.cancelCurrentTask()
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} catch {
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// task may not be running
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}
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})
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test("captures output from a multiline command on a fresh terminal", async function () {
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const api = globalThis.api
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const messages: ClineMessage[] = []
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let errorOccurred: string | null = null
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const messageHandler = ({ message }: { message: ClineMessage }) => {
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messages.push(message)
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if (message.type === "say" && message.say === "error") {
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errorOccurred = message.text || "Unknown error"
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}
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}
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api.on(RooCodeEventName.Message, messageHandler)
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const startedAt = Date.now()
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try {
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await waitUntilCompleted({
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api,
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start: () =>
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api.startNewTask({
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configuration: {
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mode: "code",
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autoApprovalEnabled: true,
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alwaysAllowExecute: true,
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allowedCommands: ["*"],
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terminalShellIntegrationDisabled: false,
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},
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text: "COLD_SHELL_INIT_E2E",
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}),
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timeout: 60_000,
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})
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const elapsedMs = Date.now() - startedAt
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assert.strictEqual(errorOccurred, null, `Error occurred: ${errorOccurred}`)
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// The fixture only responds with attempt_completion once its predicate
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// confirms "cold-init-ok" and "Exit code: 0" are in the tool result.
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// If the idle timeout misfired (premature self-finalize), the output
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// would be empty/unknown and the predicate would never match.
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const completionMessage = messages.find(
96+
(message) => message.type === "say" && message.say === "completion_result",
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)
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assert.ok(
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completionMessage,
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`Task should have reached attempt_completion with real output (elapsed: ${elapsedMs}ms). ` +
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`If this timed out, the idle timeout may have misfired before onDidStartTerminalShellExecution fired.`,
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)
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} finally {
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api.off(RooCodeEventName.Message, messageHandler)
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}
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})
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})

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