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fix: add explicit wait_for_user for text-only HITL - #861
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nettee
marked this pull request as ready for review
July 21, 2026 13:22
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Greptile SummaryThis PR adds an explicit text-only human-in-the-loop wait. The main changes are:
Confidence Score: 5/5The changed flow looks mergeable after hardening fallback deletion cleanup.
src/hooks/foreground-fallback/index.ts and the corresponding session-deletion path Important Files Changed
Sequence Diagram%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
participant O as Orchestrator
participant W as wait_for_user
participant G as Continuation Gate
participant U as User
O->>U: Provide manual steps
O->>W: wait_for_user(reason)
W->>G: Arm waiting-for-user latch
G-->>O: Suppress automatic continuation
U->>G: Send distinct external message
G->>G: Clear latch and open next epoch
%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
participant O as Orchestrator
participant W as wait_for_user
participant G as Continuation Gate
participant U as User
O->>U: Provide manual steps
O->>W: wait_for_user(reason)
W->>G: Arm waiting-for-user latch
G-->>O: Suppress automatic continuation
U->>G: Send distinct external message
G->>G: Clear latch and open next epoch
Reviews (1): Last reviewed commit: "fix: add explicit user wait for text-onl..." | Re-trigger Greptile |
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| const FALLBACK_IN_PROGRESS_KEY = Symbol.for( | ||
| 'oh-my-opencode-slim.foreground-fallback.in-progress', | ||
| ); | ||
|
|
||
| function getProcessFallbacksInProgress(): Set<string> { | ||
| const globalWithStore = globalThis as typeof globalThis & { | ||
| [FALLBACK_IN_PROGRESS_KEY]?: Set<string>; | ||
| }; | ||
| globalWithStore[FALLBACK_IN_PROGRESS_KEY] ??= new Set(); | ||
| return globalWithStore[FALLBACK_IN_PROGRESS_KEY]; | ||
| } |
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The process-global set keeps a session marked as fallback-in-progress until the original fallback reaches its cleanup path. If a genuine session.deleted event arrives during that window, task-session cleanup treats it as fallback teardown and preserves the new waiting-for-user latch. When the fallback never completes cleanly or the session ID is reused, the stale latch can indefinitely suppress continuation for the replacement session.
Owner
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thanks @nettee |
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What changed, and why was it needed?
Fixes #860.
Follow-up to #819 / #815. Builds on the process-global continuation gate from #856 / #854.
Related to #852; this addresses only the text-only external-user-wait path, not premature wakeups from subagent-completion events.
Root cause
The incomplete-todo continuation hook treats an idle orchestrator with pending work as abandoned and queues an internal
promptAsyncnudge.Native question and permission flows already suppress that behavior because they emit machine-readable wait events. A normal assistant message asking the user to perform external work emits no such event, so the session becomes idle and continues before the user can respond.
Inferring a HITL boundary from assistant prose would be brittle. This change makes that state transition explicit.
Solution
wait_for_usertool for text-only HITL boundaries. The orchestrator gives concrete manual steps first, then calls the tool as its final action. Immediate answers, choices, clarifications, and pasted output continue to use the nativequestiontool.waiting-for-userin the existing process-global continuation-attempt gate.disabled_toolsbehavior. When the tool is disabled, the prompt usesquestionas the blocking boundary and plugin health thresholds account for the intentionally disabled tool.The tool's
reasonis diagnostic only. The implementation does not parse assistant prose. The latch is intentionally process-local and does not survive a process restart.Impact
Users can receive manual instructions without an incomplete todo immediately restarting the orchestrator. Normal continuation becomes eligible again after their next distinct message.
This adds a tool and changes the static orchestrator prompt, so deployment has the expected one-time prompt-cache prefix change. It introduces no per-turn mutation of the static/system prompt; variable
reasontext appears only in the ordinary tool result.Packaged RED -> GREEN reproduction
The same isolated harness was run against the public root export of two packed artifacts. It redirects OpenCode config, data, cache, logs, and project paths to a fresh temporary directory, then:
wait_for_userwhen the package exposes it;session.idlewith one pending todo and no active sessions; andpromptAsynccalls.Both package manifests resolve the root export to
./dist/index.js. Each extractedpackage/dist/index.jsmatched its source checkout byte-for-byte.waitToolAvailablefalsetruetodoCalls10promptAsyncCalls1010A clean pre-patch build of
masterat9105d5268681b6eae8e3fb78732588e89e9ef039produced the same RED result, so the GREEN result is isolated from the commits between release 2.2.5 and current master.Artifact SHA-256 values
9f6f14cd0d18a07585f455323545f4aae9addbcd74b83b86caad17c97552f29eed1e7386d6418ddffeaacff20771359527926d51286a3c3b3d827527745dd953dist/index.js:c5694504a177b54b4b6cde4b0a7d6f7907605381a4c57a20d55ced9875d3d81ddist/index.js:301e1ca8df1d569872d514f7e1fd3a64fff07144bfe044f219158456a54e1d44Validation
bun test: 1,694 passed, 0 failed; 3 snapshots and 3,759 expectations across 102 files.bun run lint: passed.bun run typecheck: passed.bun run build: passed.bun run verify:release: passed machine-path scanning, npm packing, clean temporary installation, and package entrypoint import.bunx biome check <16 changed TypeScript files>: passed.git diff --check upstream/master: passed.bun run check:cialso checks formatting for the entire repository and reports pre-existing formatter drift in unchangedsrc/utils/env.test.tson current master. This PR does not modify that file; all changed TypeScript files pass the same Biome check. The repository's PR CI usesbun run lint, which passes.