Root cause: `formatTaskResult` and `formatFullSession` both call
`client.session.messages({ path: { id: task.sessionId } })` with no
timeout. The OpenCode SDK explicitly disables fetch timeout
(`req.timeout = false` in `packages/sdk/js/src/client.ts:37`), so when
`session.processor` enters an "Aborted process" loop (same condition
patched in #4086 for the Read hot path) every subsequent
`session.messages` call hangs forever.
User-visible impact: the parent agent running a heavy slash command
such as `/init-deep` fires many background `task` agents in parallel
and then calls `background_output(task_id, block=true)` for each. The
existing `timeoutMs` (max 10min) caps only the polling loop that waits
for the child task to transition out of `running`. Once the child is
`completed`, the loop exits and the code falls through to
`formatTaskResult` / `formatFullSession`. The 10min cap does not apply
to that post-completion fetch, so a wedged `session.messages` leaves
the tool call hanging indefinitely. The parent session appears stuck
to the user (the symptom they report on `/init-deep ultrafucking
deep`).
Fix: race the underlying `session.messages` call against a 5s timeout
through a new `withSdkCallTimeout` helper local to
`src/tools/background-task/` (mirrors `withFetchTimeout` in
`src/shared/dynamic-truncator.ts` and `withDispatchTimeout` in
`src/shared/prompt-async-gate.ts`). On timeout the caller returns a
clearly-marked `"Error fetching messages: ... timed out after 5000ms"`
fallback so the agent can recognise the failure and continue instead
of waiting forever.
Tests:
- New `sdk-call-timeout.test.ts` pins the fix with three BDD cases
using a never-settling mock and the new
`_setBackgroundOutputFetchTimeoutMsForTesting(50)` override:
(1) `formatTaskResult` resolves to the timeout fallback under the
fetch budget, (2) same for `formatFullSession`, (3) two parallel
callers against the wedged client both resolve cleanly.
- All three failed (timed out) before the fix and pass in 51ms each
after.
Verification:
- `bun test src/tools/background-task/` -- 33 pass.
- `bun test` (full suite) -- 7014 pass, 1 skip, 0 fail across 723
files.
- `bun run typecheck` -- clean (tsgo --noEmit).
- LSP diagnostics on the four changed files -- 0 errors.
- Manual QA harness `.local-ignore/init-deep-hang-qa.ts` (gitignored)
drove production default 5s timeout against a wedged client:
serial `formatTaskResult` resolved in 5001ms, serial
`formatFullSession` in 5002ms, 10 parallel `formatTaskResult` calls
all resolved within 5002ms with the timeout fallback. Without the
fix every call hangs indefinitely.
Refs: builds on #4086 (dynamic-truncator) which patched the Read hot
path of the same SDK hang.
Rename BackgroundTask and attempt ID fields to camelCase across background-agent consumers while moving BackgroundManager construction to a single config object.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Match opencode core 'task' tool behavior for metadata consistency:
1. Model fallback: When categoryModel/task.model/resumeModel is undefined,
fall back to parentContext.model so subagent metadata always includes
model info. Thread parentContext into executeSyncContinuation for parity.
2. Task ID consistency: unstable-agent-task was missing taskId and
backgroundTaskId in metadata. background_output used inconsistent
snake_case 'task_id' vs camelCase 'taskId' elsewhere. Standardize on
camelCase: taskId = sessionID (resume id), backgroundTaskId = bg task id.
Update text output blocks to use buildTaskMetadataBlock helper.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Tool return values contained CTAs ("Use background_output to check") that
caused models to immediately poll instead of waiting for <system-reminder>
notifications. Unified all 5 tool return messages with explicit "Do NOT call
background_output now" guard, added pre-notification warning to BackgroundOutput
tool description, and strengthened Background Result Collection sections across
all 3 Sisyphus prompt variants (default, gpt-5-4, main) with BLOCKING
anti-pattern enforcement.
🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
- background_output: snapshot read cursor before consuming, restore on
/undo message removal so re-reads return data (fixes#2915)
- MCP loader: preserve oauth field in transformMcpServer, add scope/
projectPath filtering so local-scoped MCPs only load in matching
directories (fixes#2917)
- runtime-fallback: add 'reached your usage limit' to retryable error
patterns so quota exhaustion triggers model fallback (fixes#2918)
Verified: bun test (4606 pass / 0 fail), tsc --noEmit clean
Move blocking/polling logic before full_session branch so that
block=true waits for task completion regardless of output format.
🤖 Generated with assistance of oh-my-opencode
- Remove runtime-fallback gate from session.status retry handler — runtime-fallback
has no session.status handler, so gating it causes retry signals to be silently dropped
- Fix background_output full_session arg description: default is true, not false
background_output auto-enabled full_session when the task was still
running, returning the entire session transcript on every poll. When
the parent agent had no other work and polled in a tight loop, this
caused massive token waste because each response dumped thousands of
tokens into the conversation history.
Default full_session to false so running-task checks return a compact
status table (~200 tokens). Callers can still pass full_session=true
explicitly when they need the full transcript.
Category-based delegation (task(category='quick')) was broken because
SISYPHUS_JUNIOR_AGENT sent 'sisyphus-junior' to session.prompt but
config.agent keys are now display names ('Sisyphus-Junior').
- Use getAgentDisplayName() for SISYPHUS_JUNIOR_AGENT constant
- Replace hardcoded 'sisyphus-junior' strings in tools.ts with constant
- Update background-output local constants to use display names
- Add remapCommandAgentFields() to translate command agent fields
- Add raw-key fallback in tool-config-handler agentByKey()
- fix(background): include "interrupt" status in all terminal status checks (3 files)
- fix(background): display "INTERRUPTED" instead of "CANCELLED" for interrupted tasks
- fix(cli): add error recovery grace period in poll-for-completion
- fix(lsp): use JSONC parser for config loading to support comments
All changes verified with tests and typecheck.
Update notification systems to display INTERRUPTED status.
Add interrupt handling to background_output tool (terminal status).
Add interrupt-specific status note to formatTaskStatus.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
YeonGyu-Kim