fix(cli): harden fleet-node attach against transient reachability - #1572
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📝 WalkthroughWalkthroughThe CLI now retries transient node session failures with bounded delays and timeouts. It classifies terminal failures and reports node, endpoint, status, and retry diagnostics. Reconnect handling allows six attempts with configurable backoff. Tests, changelog entries, and trajectory records document the changes. ChangesNode attach resilience
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Merge readiness is moderate because the current head is reported to contain a duplicate Promise declaration in the attach tests that could prevent compilation, despite the stated passing test results; this should be confirmed or fixed before merge. The changelog also retains a non-standard heading requiring follow-up. Sequence Diagram(s)sequenceDiagram
participant CLI
participant ControlPlane
participant TerminalTransport
participant ExistingClient
CLI->>ControlPlane: Request terminal session
ControlPlane-->>CLI: Return session or transient error
CLI->>ControlPlane: Retry bounded transient failures
CLI->>TerminalTransport: Open terminal connection with timeout
TerminalTransport-->>CLI: Establish or drop connection
CLI->>TerminalTransport: Retry reconnect with bounded backoff
TerminalTransport-->>ExistingClient: Deliver recovered session output
Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@CHANGELOG.md`:
- Around line 8-12: Update the changelog heading from “Unreleased - Patch” to
the required “Unreleased” format, while preserving the existing Fixed entry and
release-level mechanism.
In `@packages/cli/src/cli/lib/attach-fleet-node.ts`:
- Around line 276-305: Normalize the parsed result from ticketResponse.json() to
an empty FleetSessionResponse object whenever it is null or non-object before
accessing ticketPayload.data or ticketPayload.error. Preserve object payloads
unchanged so invalid JSON responses still produce TerminalSessionAttemptError
metadata through the existing validation path, and add a regression test
covering json() returning null.
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.agentworkforce/trajectories/completed/2026-08/traj_cagoua17frh6/summary.md.agentworkforce/trajectories/completed/2026-08/traj_cagoua17frh6/trajectory.jsonCHANGELOG.mdpackages/cli/src/cli/commands/fleet-agent.test.tspackages/cli/src/cli/commands/fleet-agent.tspackages/cli/src/cli/lib/attach-fleet-node.test.tspackages/cli/src/cli/lib/attach-fleet-node.tspackages/cli/src/cli/lib/collect-with-retry.ts
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Inline comments:
In `@packages/cli/src/cli/lib/attach-fleet-node.test.ts`:
- Around line 632-642: Remove the duplicate closed Promise declaration in the
test, retaining a single const closed that registers the
viewSocket.once('close', ...) handler and leaves await closed in the surrounding
async flow.
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CI follow-up: all checks are green except That external-service failure is outside this attach patch. The same base commit ( |
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Summary
node_unreachableandterminal_session_unavailableresponses (three bounded attempts total)Fixes #1571.
Root cause
The initial error and the later 1011 close are part of the same transient terminal-access incident class, but they have different immediate origins:
Node '<name>' is not reachabletext comes from Cloud's terminal-session POST route. Its D1 node lookup succeeded, then the 45-second heartbeat liveness gate returned structurednode_unreachable/503 before session allocation.terminal transport could not reconnect to the fleet nodetext is emitted by the CLI loopback proxy after its remote terminal WebSocket resume budget is exhausted. The old 15.5-second client budget could expire before the broker's independent terminal lane, whose backoff reaches 30 seconds, recovered.One premise in the investigation brief was therefore not quite correct: the 1011 is server-side only from the local attach client's perspective. The server emitting that close is the CLI's loopback proxy, not Cloud or the fleet node; a remote terminal-socket close triggers it after local resume attempts are exhausted.
Reproduction evidence
Before the fix, using the installed 11.6.10 CLI against
finn-mini, I ran 20 unchanged--mode viewattaches with 4-second spacing and a 6-second observation window. 18 stayed attached; attempts 18 and 20 failed withNode 'finn-mini' is not reachable. Immediately after attempt 20, the node query reported the same node online/live with six agents and a fresh heartbeat.With this branch's built CLI, the same target completed 20/20 attach observations with 2-second spacing and 10-second windows. This sample shows the observed flake disappeared; it does not claim that every successful run exercised a retry.
Verification
npx vitest run packages/cli/src/cli/lib/attach-fleet-node.test.ts packages/cli/src/cli/commands/fleet-agent.test.ts— 38/38 passednode_unreachablestops after exactly three attempts;node_not_found, malformed responses, and ambiguous network failures stop without unsafe extra attemptsnpm run typecheckand final CLItsc --noEmit— passednpm run build:cli— passednpm run lint— passed (0 errors; repository warnings remain)git diff --check— passednpm test— 2,069 passed, 25 skipped, one failure:broker-lifecycle.test.tsexpects the legacy Reflex warning text but receives structured JSON. The identical single failure reproduces in a cleanorigin/mainworktree, so it is not introduced here.