Fix DCG startup errors in remote workspaces by PierrunoYT · Pull Request #1639 · Zoo-Code-Org/Zoo-Code

PierrunoYT · 2026-09-14T15:11:00Z

Summary

validate the resolved command working directory before starting DCG (missing, not a directory, or no search permission), so the error appears before the approval prompt
keep normal command approval behavior unchanged when DCG is disabled
include the executable and working directory in DCG spawn errors
add regression coverage for missing, non-directory, and permission-denied working directories

A missing cwd makes Node report spawn <executable> ENOENT against the executable (Remote-SSH Linux in #1603, Windows in #1770), which looks like a broken DCG install.

Fixes #1603
Fixes #1770

Verification

pnpm --dir src exec vitest run core/tools/tests/executeCommandTool.spec.ts core/tools/tests/executeCommand.spec.ts services/destructive-command-guard/tests/runner.spec.ts services/destructive-command-guard/tests/manager.spec.ts
pnpm --dir src check-types
pnpm --dir src exec eslint --prune-suppressions --max-warnings=0 core/tools/ExecuteCommandTool.ts core/tools/tests/executeCommandTool.spec.ts services/destructive-command-guard/runner.ts services/destructive-command-guard/tests/runner.spec.ts
real DCG v0.7.7 Node spawn smoke test under Ubuntu/WSL

coderabbitai · 2026-09-14T15:11:07Z

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📒 Files selected for processing: 4

src/core/tools/ExecuteCommandTool.ts
src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/eslint-suppressions.json

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Treat model, provider, MCP, path, command, and tool data as untrusted.

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src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/core/tools/ExecuteCommandTool.ts

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src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts

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src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/core/tools/ExecuteCommandTool.ts

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src/eslint-suppressions.json
src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/core/tools/ExecuteCommandTool.ts

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src/core/tools/__tests__/executeCommand.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/core/tools/ExecuteCommandTool.ts

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src/eslint-suppressions.json

🪛 GitHub Check: mutation-diff

src/core/tools/ExecuteCommandTool.ts

[warning] 101-101: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:101: NoCoverage StringLiteral mutant (replacement: ``). See the job summary for the complete list and resolution guidance.

[warning] 100-100: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:100: 2 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: false). See the job summary for the complete list and resolution guidance.

[warning] 93-93: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:93: 5 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.

🔇 Additional comments: 4

src/core/tools/ExecuteCommandTool.ts: 1

83-105: LGTM!

Also applies to: 161-171, 426-428

src/core/tools/__tests__/executeCommand.spec.ts: 1

265-267: LGTM!

Also applies to: 286-317

src/core/tools/__tests__/executeCommandTool.spec.ts: 1

755-874: LGTM!

src/eslint-suppressions.json: 1

929-929: LGTM!

📝 Summary

Summary by CodeRabbit

Bug Fixes
- Commands now fail safely when the specified working directory is missing, points to a file, or lacks required access permissions.
- Destructive command protection validates the effective working directory before starting, and invalid paths return an error without proceeding.
- Terminal commands apply the same working-directory checks and avoid opening a terminal for invalid paths.
- Startup errors for command protection now identify the executable and working directory, making failures easier to diagnose.

The command tool validates working directories before DCG setup and terminal execution. Validation checks directory type and search permission. DCG startup errors include the executable path and working directory.

Changes: Command execution errors

Layer / File(s)	Summary
Working directory validation `src/core/tools/ExecuteCommandTool.ts`, `src/core/tools/__tests__/executeCommandTool.spec.ts`, `src/core/tools/__tests__/executeCommand.spec.ts`, `src/eslint-suppressions.json`	A shared helper checks that the working directory is a directory and has search permission. `execute` validates the effective working directory before DCG setup. Terminal execution uses the same validation. Tests cover missing paths, files, permission failures, other filesystem errors, and skipped DCG or terminal startup.
DCG startup diagnostics `src/services/destructive-command-guard/runner.ts`, `src/services/destructive-command-guard/__tests__/runner.spec.ts`	DCG startup errors now include the executable path and working directory. The test checks the rejection and warning messages.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to efc45

Working-directory errors are reported before DCG starts, and the previously identified misleading diagnostics are corrected. The change is ready to merge after normal checks.

Security architecture risk: 🔵 Low · up to f1aba

Early directory rejection preserves existing command authorization rules. No new execution permission or approval bypass was identified. Residual uncertainty concerns concurrent execution and working-directory changes during startup.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The changed path affects filesystem metadata checks and command startup on the existing execution host. Agent-selected cwd values reach stat/access checks, while command execution still reaches the existing terminal through the existing approval policy. The compared changes do not add an execution or credential capability.

Security Findings and Attack Paths

inferred — Earlier, more specific filesystem diagnostics are not evidence of a newly introduced pre-approval command-execution bypass. The base already attempted DCG startup in caller-selected directories before approval and surfaced subprocess error messages. The added path context does not establish a secret-disclosure finding.

Trust Boundaries and Controls

observed — DCG continues to receive the command as an argument with shell execution disabled and an allowlisted environment. Approval retains the existing distinction between allowed commands, blanket denial and protected user overrides of DCG denials. Infrastructure errors do not become allow decisions.

Resilience and Maintainability Implications

inferred — Directory validation is a snapshot, not an atomic binding between policy evaluation and actual shell execution. Terminal reuse checks the requested cwd, but shell integration supplies mutable current-directory information. End-to-end identity stability remains unproven; this terminal mechanism predates the PR and is not retained as an introduced concern.

Pre-merge checks: 8

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: fixing DCG startup errors in remote workspaces.
Description check		The description explains the implementation, links the related issues, describes the expected behavior, and lists detailed verification steps. It uses Summary and Verification headings instead of the …
Linked Issues check		For [`#1603`, `#1770`], `ExecuteCommandTool.execute` resolves the effective `cwd` and validates it before DCG installation, DCG execution, or approval. `commandWorkingDirectoryError` reports missing paths…
Out of Scope Changes check		The changed source implements working-directory validation and DCG startup diagnostics required by [`#1603`, `#1770`]. The test changes exercise these behaviors and preserve DCG-disabled behavior. The sup…
Regression Evidence		Focused coverage exists for the changed behavior. `executeCommandTool.spec.ts` covers missing, non-directory, search-permission, and other filesystem errors before DCG installation or approval, and ch…
Security Boundaries		No changed path meets a security-boundary failure condition. `ExecuteCommandTool.ts` validates the resolved working directory and rejects invalid paths before DCG or terminal startup. Valid commands s…
Persistence Integrity		No changed persistence path exists. The production diff adds awaited `fs.stat`/`fs.access` validation and changes DCG error text. It does not add or alter file writes, atomicity, rollback, or persiste…
Lifecycle Resource Cleanup		No changed lifecycle path can leak a resource or duplicate work. The new working-directory validation performs only awaited `stat` and `access` calls before DCG or terminal creation. Invalid directori…

Full details: Description check

Explanation

The description explains the implementation, links the related issues, describes the expected behavior, and lists detailed verification steps. It uses Summary and Verification headings instead of the template headings and does not include the checklist, but it contains the critical information needed for review.

Full details: Linked Issues check

Explanation

For [#1603, #1770], ExecuteCommandTool.execute resolves the effective cwd and validates it before DCG installation, DCG execution, or approval. commandWorkingDirectoryError reports missing paths, non-directories, and denied search access. runner.ts includes the DCG executable and working directory in startup errors. Regression tests cover the three directory failures, DCG-disabled approval behavior, and terminal non-startup. The changes satisfy the linked coding requirements.

Full details: Out of Scope Changes check

Explanation

The changed source implements working-directory validation and DCG startup diagnostics required by [#1603, #1770]. The test changes exercise these behaviors and preserve DCG-disabled behavior. The suppression-count update supports the changed test file. No unrelated change is demonstrated.

Full details: Regression Evidence

Explanation

Focused coverage exists for the changed behavior. executeCommandTool.spec.ts covers missing, non-directory, search-permission, and other filesystem errors before DCG installation or approval, and checks the DCG-disabled approval path. executeCommand.spec.ts covers terminal validation for missing, file, non-directory ancestor, absolute, and relative paths. runner.spec.ts covers the executable-and-working-directory startup error. No durable UI component changed.

Full details: Security Boundaries

Explanation

No changed path meets a security-boundary failure condition. ExecuteCommandTool.ts validates the resolved working directory and rejects invalid paths before DCG or terminal startup. Valid commands still pass through askApproval; DCG approval does not directly execute the command. The existing rooIgnore check and command-policy recheck remain before terminal execution. runner.ts only adds executable and working-directory context to spawn-error diagnostics and keeps shell: false; it does not execute new input or weaken an allowlist.

Full details: Persistence Integrity

Explanation

No changed persistence path exists. The production diff adds awaited fs.stat/fs.access validation and changes DCG error text. It does not add or alter file writes, atomicity, rollback, or persisted-default propagation. The existing OutputInterceptor storage path remains unchanged.

Full details: Lifecycle Resource Cleanup

Explanation

No changed lifecycle path can leak a resource or duplicate work. The new working-directory validation performs only awaited stat and access calls before DCG or terminal creation. Invalid directories return before installer, DCG, approval, terminal, interceptor, or timer setup. The changed runDcg error handler still routes through fail, which marks the operation settled, clears the timeout, and rejects; later close events are ignored.

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src/core/tools/__tests__/executeCommand.spec.ts

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src/core/tools/__tests__/executeCommandTool.spec.ts

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github-actions · 2026-09-14T15:11:14Z

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codecov · 2026-09-14T15:15:30Z

Codecov Report

❌ Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/tools/ExecuteCommandTool.ts	87.50%	0 Missing and 3 partials ⚠️

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Inline comments:
In `@src/core/tools/ExecuteCommandTool.ts`:
- Line 81: Update the working-directory validation around fs.access in
ExecuteCommandTool so it also calls fs.stat and requires stat.isDirectory()
before succeeding; preserve the existing accessibility check and return the
intended working-directory error for existing files. Add regression coverage for
an existing file supplied as cwd, including the relevant boundary case.

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📒 Files selected for processing (4)

src/core/tools/ExecuteCommandTool.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/services/destructive-command-guard/__tests__/runner.spec.ts
src/services/destructive-command-guard/runner.ts

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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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src/services/destructive-command-guard/__tests__/runner.spec.ts
src/services/destructive-command-guard/runner.ts

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src/services/destructive-command-guard/__tests__/runner.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/services/destructive-command-guard/runner.ts
src/core/tools/ExecuteCommandTool.ts

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src/services/destructive-command-guard/__tests__/runner.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts

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Files:

src/services/destructive-command-guard/__tests__/runner.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/services/destructive-command-guard/runner.ts
src/core/tools/ExecuteCommandTool.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

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src/services/destructive-command-guard/__tests__/runner.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/services/destructive-command-guard/runner.ts
src/core/tools/ExecuteCommandTool.ts

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src/services/destructive-command-guard/__tests__/runner.spec.ts
src/core/tools/__tests__/executeCommandTool.spec.ts
src/services/destructive-command-guard/runner.ts
src/core/tools/ExecuteCommandTool.ts

🪛 ast-grep (0.45.3)

src/services/destructive-command-guard/runner.ts

[warning] Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn } from "child_process"
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').

(detect-child-process-typescript)

🪛 GitHub Check: mutation-diff

src/core/tools/ExecuteCommandTool.ts

[warning] 149-149: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:149: Survived BooleanLiteral mutant (replacement: false). See the job summary for the complete list and resolution guidance.

[warning] 300-300: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:300: 2 mutation test gaps; example: NoCoverage ArrayDeclaration mutant (replacement: []). See the job summary for the complete list and resolution guidance.

[warning] 299-299: Mutation test advisory
src/core/tools/ExecuteCommandTool.ts:299: Survived ConditionalExpression mutant (replacement: false). See the job summary for the complete list and resolution guidance.

🔇 Additional comments (2)

src/services/destructive-command-guard/runner.ts (1)

58-64: LGTM!

src/services/destructive-command-guard/__tests__/runner.spec.ts (1)

141-143: LGTM!

MarkSwanson · 2026-09-16T03:16:38Z

Fyi this fix worked for me.

edelauna

Thanks for picking this up - had some small improvement suggestions.

Keep DCG approval safeguards while resolving the command-tool conflict. Distinguish missing and non-directory paths from unexpected filesystem failures, and retain original failure messages on DCG and terminal paths. Amp-Thread-ID: https://ampcode.com/threads/T-01a10c95-779b-756d-9944-c14dcc2f955e Co-authored-by: Amp <[email protected]>

Resolve the executeCommandInTerminal conflict by keeping commandWorkingDirectoryError, which supersedes upstream's existence-only fs.access check. Pass toolCallId in the new working-directory tests now that ToolCallbacks and ExecuteCommandOptions require it (Zoo-Code-Org#2015). Co-Authored-By: Claude Opus 5.5 <[email protected]>

fix(dcg): diagnose remote spawn working directory

80e4a98

PierrunoYT requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners September 14, 2026 15:11

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Comment thread src/core/tools/ExecuteCommandTool.ts Resolved

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fix(command): reject file working directories

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Merge branch 'main' into fix/1603-remote-dcg-spawn

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Comment thread src/core/tools/__tests__/executeCommandTool.spec.ts Resolved

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Comment thread src/core/tools/ExecuteCommandTool.ts Resolved

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test(command): cover invalid working directories

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Fix DCG startup errors in remote workspaces - #1639

Fix DCG startup errors in remote workspaces#1639
edelauna merged 11 commits into
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PierrunoYT:fix/1603-remote-dcg-spawn

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