[Kaap10]

Summary

• Hold command outputs in variables rather than redirecting to ${TMPDIR:-/tmp}/... in probe-3-container-gateway.sh and probe-5-signing-key.sh, matching the sandbox contract documented in isolated-setup-doctor/scripts/README.md.
• Guard socket.AF_UNIX and add UTF-8 encoding in test_probe_1_ssh_agent.py to prevent AttributeError crashes on platforms without Unix domain socket support.
• Add comprehensive unit test suites test_probe_3_container_gateway.py and test_probe_5_signing_key.py.

Type of change

• Skill change (.claude/skills/<name>/) — eval fixtures updated below
• Tool / bridge contract (tools/<system>/*.md)
• Python package (tools/*/ with pyproject.toml)
• Groovy reference impl
• Cross-cutting (RFC, AGENTS.md, sandbox, privacy-LLM)
• Documentation (docs/, README.md, CONTRIBUTING.md)
• Project template (projects/_template/)
• CI / dev loop (prek, workflows, validators)
• Other: Doctor diagnostic probe scripts and tests (plugins/magpie-setup/skills/isolated-setup-doctor/)

Test plan

• prek run / ruff check and ruff format --check pass on touched files with zero warnings.
• Ran unit test discovery via python -m unittest discover -s plugins/magpie-setup/skills/isolated-setup-doctor/tests/ (14 tests run: 14 passed / 3 skipped where AF_UNIX is unsupported).
• Ran pytest plugins/magpie-setup/skills/isolated-setup-doctor/tests/ (11 passed, 3 skipped, 0 failures).
• Verified unit tests assert that no error files are created under /tmp or $TMPDIR.

RFC-AI-0004 compliance

• HITL — any new mutation is gated on explicit user confirmation
• Sandbox — no new unrestricted host access; network reach declared in the adapter
• Vendor neutrality — placeholders (<PROJECT>, <tracker>, <upstream>, <security-list>) used in all skill / tool prose (the check-placeholders prek hook is the mechanical gate)
• Conversational + correctable — agentic-override path documented if behaviour is adopter-tunable
• Write-access discipline — no autonomous outbound messages; drafts only, sent on confirmation
• Privacy LLM — private content does not reach a non-approved LLM; redactor invoked where needed

Linked issues

Closes #1775
Refs #1770

Notes for reviewers (optional)

Following up on #1770 (which eliminated /tmp writes for Probe 1), Probes 3 and 5 still redirected stderr/stdout to files under ${TMPDIR:-/tmp}, causing them to abort and report false failures inside read-only sandboxes. This PR brings them into full alignment with the README contract.

[Kaap10]

Following up on #1770, this holds command outputs in variables rather than redirecting to /tmp in probe-3 and probe-5, preventing false failures inside read-only sandboxes.

Added comprehensive unit test suites for both probes verifying no files are written under /tmp or $TMPDIR, along with an AF_UNIX guard for test_probe_1.

Ready for review, @potiuk!

[potiuk]

Holding the probe output in memory instead of a file under /tmp is the right fix for the read-only sandbox, and probe 5's change is correct; probe 3's capture needs two adjustments, and its new tests do not reach the line that changed.

Capturing the probe through a pipe makes it wait out the watchdog, and mixes stdout into the error (plugins/magpie-setup/skills/isolated-setup-doctor/scripts/probe-3-container-gateway.sh:104)

out=$(_probe_timeout 15 "$rt" info 2>&1); rc=$?

Two regressions from moving the output into $(…). When neither timeout nor gtimeout is on PATH (stock macOS), _probe_timeout starts (sleep 15 && kill …) &; that sleep inherits the capture pipe, and killing the subshell does not kill it, so $(…) waits the full 15 s even for a healthy runtime (30 s for both). And 2>&1 now captures stdout too: docker info prints its Client: block before failing on the server, so err becomes that first stdout line and the operation not permitted / 502 matches below never fire.

Flagged by both the primary and adversarial reviewers.

Smaller observations

• See inline comments on plugins/magpie-setup/skills/isolated-setup-doctor/tests/test_probe_3_container_gateway.py:142, plugins/magpie-setup/skills/isolated-setup-doctor/tests/test_probe_5_signing_key.py:39.

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[potiuk]

Marking this as changes requested, so the PR's status matches where it stands: the points in my earlier review (#1776 (review)) are still open and need a change, or a reply on their threads. This review adds nothing new to them.

---

This review was drafted by an AI-assisted tool and
confirmed by an Apache Magpie maintainer. After you've
addressed the points above and pushed an update, an Apache Magpie
maintainer — a real person — will take the next look
at the PR. The findings cite the project's review criteria;
if you think one of them is mis-applied, please reply on the
PR and a maintainer will weigh in.

More on how Apache Magpie handles maintainer review:
Contributing guide.

[Kaap10]

Thanks @potiuk for the review and catching both the macOS pipe inheritance and the Docker stdout stream mix-up.

Addressed all findings in dff5fd54:

1. Watchdog pipe leak (probe-3:55):

   • Redirected the watchdog subshell to /dev/null: (sleep "$secs" && kill "$cmd_pid" 2> /dev/null) > /dev/null 2>&1 &.
   • The background watchdog no longer inherits the capture pipe and does not delay command substitution when timeout/gtimeout is missing on macOS.

2. Stream separation (probe-3:104):

   • Updated the info capture to out=$(_probe_timeout 15 "$rt" info 2>&1 > /dev/null); rc=$?.
   • Stdout (such as Docker's Client: preamble) is discarded to /dev/null, capturing only stderr for matching.

3. Shared test helpers:

   • Extracted find_bash, to_posix, and run_probe_script into a shared helpers.py module used by both test_probe_3_container_gateway.py and test_probe_5_signing_key.py.

4. Probe 3 test reachability & stream assertions:

   • Refactored test_writes_nothing_under_tmp to run with a stub container gateway and real unix domain socket under self.tmp with cwd=self.tmp. This exercises line 104 ($rt info), asserts the permission denial message, and verifies zero .err files are written under /tmp.
   • Added test_docker_stdout_does_not_mask_stderr_error with a fake docker printing Client: to stdout and 502 Bad Gateway to stderr, asserting the 502 error is reported and Client: is dropped.