AbortController refactor — verification plan

Scenarios used to validate the change manually before opening the PR. Each scenario captures its tmux pane via tmux pipe-pane -o 'cat >> <log>'.

Setup once

# Point WT at your local checkout of the branch under review.
WT=/path/to/qwen-code/worktree
LOGDIR=$WT/docs/verification/abort-controller-refactor/logs
mkdir -p "$LOGDIR"

# Build the CLI once (skip sandbox image, skip vscode).
( cd "$WT" && npm run build:packages )

Scenarios

For each scenario:

tmux new-session -d -s qwen-verify-XX
tmux pipe-pane -t qwen-verify-XX -o "cat >> $LOGDIR/XX-name.log"
tmux send-keys -t qwen-verify-XX "cd /path/to/your/test/workspace && exec node $WT/packages/cli/dist/index.js" C-m
tmux attach -t qwen-verify-XX

Then drive the session manually per the matrix below. Hit C-b d to detach when done; tmux kill-session -t qwen-verify-XX to stop the pane.

00 — Baseline (PRE-fix)

• Setup: check out main, build, run with NODE_OPTIONS=--trace-warnings.
• Input: long 50-round mixed-tool session (shell + edit + grep + agent).
• Expected: after ~30–40 rounds, MaxListenersExceededWarning: ... 1500+ abort listeners added to [AbortSignal] printed to stderr.
• Log: 00-baseline-reproduction.log.

01 — Long-session, DEBUG mode (this branch)

• Setup: NODE_OPTIONS=--trace-warnings DEBUG=1 qwen.
• Input: same 50-round script as #00.
• Expected: no MaxListenersExceededWarning printed; any other warnings still print.
• Log: 01-long-session-debug.log.

02 — Long-session, prod mode (this branch)

• Setup: qwen (no debug env).
• Input: same 50-round script.
• Expected: clean output; a temporary console.error probe inside the handler (added then removed) confirms the filter fires.
• Log: 02-long-session-prod.log.

03 — Ctrl-C mid-stream abort

• Setup: this branch, interactive.
• Input: ask for a long generation (>30s); press Ctrl-C mid-stream.
• Expected: stream stops within ~200ms, "Cancelled" banner shown, next prompt accepts input. process._getActiveHandles() count returns to baseline (use :debug handles).
• Log: 03-ctrlc-streaming.log.

04 — Cancel long-running shell

• Setup: this branch.
• Input: run sleep 60 via the shell tool; cancel mid-execution.
• Expected: child process killed (verify with pgrep -f sleep returning empty), tool result shows cancellation, agent accepts next prompt.
• Log: 04-shell-cancel.log.

05 — Subagent cancellation

• Setup: this branch.
• Input: spawn a long agent task via the agent tool; cancel from parent.
• Expected: subagent's in-flight tool calls abort, subagent's model stream stops, parent receives cancellation event.
• Log: 05-subagent-cancel.log.

06 — Headless / non-interactive abort

• Setup: qwen --prompt "do a long task"; send SIGINT from outside via kill -INT <pid>.
• Expected: clean shutdown, exit code 130, no warnings.
• Log: 06-headless-abort.log.

07 — Background agent flow

• Setup: interactive.
• Input: spawn a background agent (run_in_background: true); let it complete; spawn a second one; cancel the second mid-flight.
• Expected: first agent completes normally; second aborts cleanly; no listener leak across the two.
• Log: 07-background-agent.log.

08 — Memory baseline

• Setup: qwen --inspect, attach Chrome devtools.
• Input: 100-round session.
• Expected: heap snapshots at round 0/50/100. AbortSignal instance count and per-signal listener count stable (no monotonic growth).
• Log: 08-memory-snapshots/.

09 — Existing combinedAbortSignal consumer

• Setup: trigger an HTTP hook with both an external signal and timeout.
• Input: (a) cancel external signal mid-hook; (b) let timeout fire in a separate run.
• Expected: hook aborts cleanly in both cases; deprecation shim path is exercised.
• Log: 09-http-hook-shim.log.

Automated (non-interactive) verifications

The automated checks below were run during development and recorded in automated-results.md:

• All abortController unit tests pass (abortController.test.ts, 26 tests; 1 GC test skipped under non---expose-gc).
• All warningHandler tests pass (warningHandler.test.ts, 13 tests including a spawned-child stderr integration test).
• All combineAbortSignals consumer tests pass (httpHookRunner.test.ts); the deprecated createCombinedAbortSignal shim plus its own test file were removed once the lone caller migrated.
• All agent runtime / followup / openaiContentGenerator / hooks tests pass.
• Migration scope (intentional): only the agent-runtime parent→child chain (agent-interactive.ts, agent-core.ts, agent-headless.ts) plus promptHookRunner.ts (real cleanup leak) was switched to the helper. Independent short-lived controllers (per-shell-command, per-fetch, per-recall, etc.) stay on raw new AbortController() — they're GC'd quickly and don't accumulate listeners on a long-lived parent. See migration-completeness.txt for the captured grep + rationale.
• TypeScript strict-mode typecheck passes for both packages/core and packages/cli.
• Prettier check passes on all modified files.

See automated-results.md for the actual command output.

How to capture the artifacts for the PR body

After running each scenario, attach the transcript file (or relevant excerpt) to the PR. For #08 (memory), export the heap snapshots and include the listener-count delta between snapshots.