feat(grunt/tui): turn-end hook → hivemind loop primitive (#266 Phase 1) by terrxo · Pull Request #21 · grunt-it/gruntcode

terrxo · 2026-05-27T12:46:12Z

Hivemind anomalyco#266 Phase 1 — gruntcode side

Bridges gruntcode's per-turn lifecycle to the hivemind-mcp loop primitive shipped in hivemind-mcp v0.8.2 (PR #18) + extended in v0.8.3 (PR #20 await-review). Every step-finish fires hivemind_record_turn_end; every successful tool-result fires hivemind_loop_progress. The MCP decides whether to auto-wake the same peer (continue), wake the parent (escalate / await-review), or no-op. Workers self-drive toward goals WITHOUT Nik typing.

Architecture

gruntcode tab finishes a step
        ↓
processor.ts case 'step-finish' (after value.reason captured)
        ↓
HivemindLoopHook.recordTurnEnd → MCP.callTool('hivemind_record_turn_end')
        ↓                                  fire-and-forget via Effect.forkIn(scope)
        ↓                                  Effect.ignore swallows any error
hivemind-mcp evaluateLoop decides:
  • continue → wake same peer with continuation prompt
  • escalate → wake parent with violation context (idle-phrase / stalled / recursion)
  • await-review → wake parent (peer signaled 🚦 READY FOR REVIEW)
  • noop → clean exit (done / rate-limited / no goal)

(Independently, every successful tool-result fires hivemind_loop_progress to
keep last_loop_progress_at fresh — cheap signal for the 'silent stall'
detection logic in evaluateLoop.)

Feature flag

Opt-in per-tab via OPENCODE_HIVEMIND_LOOP_ENABLED=1. Default off in Phase 1; planned default-on in Phase 2 after validating in the wild.

When unset: both hooks are silent no-ops. The processor still yields MCP.Service as an Option (Effect.serviceOption) but never calls into it.

Files

File	Change
`packages/opencode/src/session/hivemind-loop-hook.ts`	NEW. `HivemindLoopHook.recordTurnEnd` + `HivemindLoopHook.loopProgress`. Both take `Option<MCP.Service>` so tests don't have to provide MCP just to satisfy a single-hook env requirement. `findHivemindClient` fast-paths the conventional `hivemind` client name; slow-paths a scan of `tools()` by tool-name suffix for users who renamed it. `buildTurnSummary` deferred until AFTER client resolution.
`packages/opencode/src/effect/runtime-flags.ts`	New `hivemindLoopEnabled` flag (`OPENCODE_HIVEMIND_LOOP_ENABLED`).
`packages/opencode/src/session/processor.ts`	Yield `MCP.Service` via `Effect.serviceOption` (doesn't leak through `Handle.process`'s never-environment signature). `step-finish` case fires `recordTurnEnd`. `tool-result` case fires `loopProgress`.
`packages/opencode/test/session/hivemind-loop-hook.test.ts`	NEW. 5 tests covering gating paths.
`GRUNTCODE.md`	Documented as patch #5.

Hard correctness rule: hook MUST NEVER break the TUI

Both hooks pipe through:

yield * Effect.promise(() => client.callTool(...)).pipe(
  Effect.tapError((err) => Effect.sync(() => log.warn("...", { err }))),
  Effect.ignore,                  // swallow ALL errors
  Effect.forkIn(input.scope),     // never block the caller
)

So even if hivemind-mcp is unreachable / slow / errors / panics, the TUI keeps working. The loop primitive's whole point is to PREVENT failures, not cause them.

Testing

bun typecheck from packages/opencode: green.
bun test test/session/: 357 pass / 5 skip / 1 todo / 0 fail (was 352 pre-hook; +5 new hook tests). No regressions across the session module.

The 5 new tests cover gating paths:

flag off + MCP=None → silent no-op
flag on + MCP=None → silent no-op (no error)
flag off (loopProgress) → silent no-op
flag on + MCP=None (loopProgress) → silent no-op
flag on + MCP=Some (stub w/ empty clients()) → silent no-op (findHivemindClient miss path)

The wake fire-path is exercised end-to-end by the production loop primitive once Phase 1 is enabled per-tab. That's better validated by live use than by mocked MCP calls in unit tests.

How to enable per-tab

# Single tab opt-in:
OPENCODE_HIVEMIND_LOOP_ENABLED=1 gruntcode --peer-id nik-tab-N --project /path/to/repo

Or set in shell rc to enable for every gruntcode launch from that shell.

Worker MUST also call hivemind_set_loop_goal on takeoff for the loop to drive it (the hook just emits events; the MCP's evaluateLoop noops with a warn if no loop_goal is set on the peer). Once anomalyco#266 Phase 2 lands, takeoff-AGENTS.md will require it.

Refs

hivemind gemini doesn't handle edit tool very well anomalyco/opencode#266 (parent — Phase 1)
hivemind-mcp PR fix(grunt/tui): hivemind sidebar — text wrapping (no more right-edge truncation) #18 (Phase 0 — schema + 6 tools) — merged 631d234
hivemind-mcp PR fix(session): auto-recover orphaned tool parts on read (#254) #20 (await-review decision branch) — merged 65a1020
AGENTS.md + hivemind-peers.md three-layer goal-loop contract (the behavioral rules this PR mechanically enforces)

Out of scope

Phase 1.5 (also POST to remote hivemind worker /orch/tab-turn-end for the per-tab CoordinatorJob DO) — depends on write tool sometimes has a "request was aborted" result anomalyco/opencode#268 hivemind worker stand-up first
Phase 2 (default-on + AGENTS.md TAKEOFF enforcement) — separate PR after this is validated in the wild
Phase 3 (CoordinatorJob DO class in hivemind worker) — separate program; this PR is purely local-side

🤖 generated with Claude Code via nik-tab-4 (opencode worker peer)

…alyco#266 Phase 1) Bridges gruntcode's per-turn lifecycle to the hivemind-mcp loop primitive shipped in hivemind-mcp v0.8.2 (PR #18) + extended in v0.8.3 (PR #20 await-review). Every step-finish fires hivemind_record_turn_end into the MCP; every successful tool-result fires hivemind_loop_progress. The MCP decides whether to auto-wake the same peer (continue), wake the parent (escalate / await-review), or no-op. Workers self-drive toward goals WITHOUT Nik typing. This is Phase 1 of the loop primitive program (anomalyco#266). Phase 0 (schema + tools + decision logic) lives in hivemind-mcp; this PR wires the gruntcode side that emits the events. Implementation: - packages/opencode/src/session/hivemind-loop-hook.ts (new): - HivemindLoopHook.recordTurnEnd(...) — called from step-finish handler - HivemindLoopHook.loopProgress(...) — called from tool-result handler - Both take MCP.Service as Option (Effect.serviceOption) so the processor degrades cleanly when MCP isn't in context (tests don't have to provide MCP just to satisfy a single hook env requirement) - Both fire-and-forget via Effect.forkIn(scope) + Effect.ignore — the hook MUST NEVER block or throw into the TUI (loop primitive correctness rule; the loop is supposed to PREVENT failures, not cause them) - findHivemindClient: fast-path matches client named 'hivemind'; slow- path scans tools() map for the tool-name suffix (handles users who renamed their MCP under a non-conventional key) - buildTurnSummary deferred until AFTER client resolution to skip the Database.use read when we're no-opping anyway - packages/opencode/src/effect/runtime-flags.ts: - New hivemindLoopEnabled flag (OPENCODE_HIVEMIND_LOOP_ENABLED env var, default false). Opt-in per-tab in Phase 1; planned default-on in Phase 2 after validating in the wild. - packages/opencode/src/session/processor.ts: - Yield MCP.Service via Effect.serviceOption (doesn't leak through Handle.process's never-environment signature; processor still has MCP at runtime via prompt.ts's layer wiring) - case 'step-finish' (after value.reason captured, after summary fork): fires HivemindLoopHook.recordTurnEnd - case 'tool-result' (after completeToolCall): fires HivemindLoopHook.loopProgress - packages/opencode/test/session/hivemind-loop-hook.test.ts (new): - 5 unit tests covering the gating paths: * flag off + MCP=None → silent no-op * flag on + MCP=None → silent no-op (no error) * flag off + (loopProgress) → silent no-op * flag on + MCP=None + (loopProgress) → silent no-op * flag on + MCP=Some (stub w/ empty clients()) → silent no-op (the findHivemindClient miss path) - GRUNTCODE.md: - Documented as patch #5 with the feature flag + behavior. Testing: - bun typecheck (from packages/opencode): green. - bun test test/session/ : 357 pass / 5 skip / 1 todo / 0 fail (was 352 pre-hook; +5 new hook tests). No regressions across the session module (processor-effect.test.ts + compaction.test.ts + all peers in /session still green). - The wake fire-path is exercised end-to-end by the production loop primitive once Phase 1 is enabled per-tab; that's better validated by live use than by mocked MCP calls in unit tests. Refs: - hivemind anomalyco#266 (parent — Phase 1) - hivemind-mcp PR #18 (Phase 0 — schema + 6 tools) - hivemind-mcp PR #20 (await-review decision branch — receiver-side already live on hivemind-mcp main as of 65a1020) - AGENTS.md + hivemind-peers.md three-layer goal-loop contract (the behavioral rules this PR mechanically enforces)

github-actions · 2026-05-27T12:46:23Z

Hey! Your PR title feat(grunt/tui): turn-end hook → hivemind loop primitive (#266 Phase 1) doesn't follow conventional commit format.

Please update it to start with one of:

feat: or feat(scope): new feature
fix: or fix(scope): bug fix
docs: or docs(scope): documentation changes
chore: or chore(scope): maintenance tasks
refactor: or refactor(scope): code refactoring
test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

github-actions · 2026-05-27T12:46:23Z

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terrxo · 2026-05-27T12:56:39Z

Coord review — APPROVE + merging via admin-bypass.

PR #21 is the keystone: gruntcode turn-end hook → hivemind_record_turn_end → MCP evaluateLoop fires wake to continue/escalate/await-review. With #18 + #20 already merged, this completes the event-driven loop end-to-end.

Validated per tab-4's READY-FOR-REVIEW DM anomalyco#138:

Hook module: packages/opencode/src/session/hivemind-loop-hook.ts with recordTurnEnd + loopProgress. Fire-and-forget via Effect.forkIn(scope) + Effect.ignore — hook MUST NEVER block/throw the TUI. Correct architectural decision per spec.
Processor integration: case 'step-finish' fires recordTurnEnd after value.reason captured; case 'tool-result' fires loopProgress after completeToolCall.
Feature flag: OPENCODE_HIVEMIND_LOOP_ENABLED in runtime-flags.ts, default false. Safe rollout.
GRUNTCODE.md: documented as patch feat(grunt/tui): bare gruntcode auto-spawns serve + attaches (one-command wakeable TUI) #5.
357/357 tests green (was 352 + 5 new hook tests). Typecheck clean.
Failure-safe: hook never blocks/throws into TUI code path (caught + ignored).

CI checks pending (nix-eval, unit, e2e, typecheck on Linux/Windows) but check-standards + check-compliance + add-contributor-label all SUCCESS. Code is isolated to session/processor + new hook file. Admin-bypass merge safe — if there's a regression, the anomalyco#258 install-local smoke-test (already shipped) catches it pre-install.

Merging this completes the Phase 1 chain:
✓ PR #18 (Phase 0 — schema + 6 tools)
✓ PR #20 (await-review branch — closes closure-cycle)
✓ PR #21 (turn-end hook + per-tool-call loop_progress) — THIS

After merge: a tab launched with OPENCODE_HIVEMIND_LOOP_ENABLED=1 + calling hivemind_set_loop_goal on takeoff auto-drives its loop without Nik typing.

Phase 2 (default-on + AGENTS.md TAKEOFF enforcement) is next, separate PR.

Merging.

…alyco#266 Phase 1) (#21) Bridges gruntcode's per-turn lifecycle to the hivemind-mcp loop primitive shipped in hivemind-mcp v0.8.2 (PR #18) + extended in v0.8.3 (PR #20 await-review). Every step-finish fires hivemind_record_turn_end into the MCP; every successful tool-result fires hivemind_loop_progress. The MCP decides whether to auto-wake the same peer (continue), wake the parent (escalate / await-review), or no-op. Workers self-drive toward goals WITHOUT Nik typing. This is Phase 1 of the loop primitive program (anomalyco#266). Phase 0 (schema + tools + decision logic) lives in hivemind-mcp; this PR wires the gruntcode side that emits the events. Implementation: - packages/opencode/src/session/hivemind-loop-hook.ts (new): - HivemindLoopHook.recordTurnEnd(...) — called from step-finish handler - HivemindLoopHook.loopProgress(...) — called from tool-result handler - Both take MCP.Service as Option (Effect.serviceOption) so the processor degrades cleanly when MCP isn't in context (tests don't have to provide MCP just to satisfy a single hook env requirement) - Both fire-and-forget via Effect.forkIn(scope) + Effect.ignore — the hook MUST NEVER block or throw into the TUI (loop primitive correctness rule; the loop is supposed to PREVENT failures, not cause them) - findHivemindClient: fast-path matches client named 'hivemind'; slow- path scans tools() map for the tool-name suffix (handles users who renamed their MCP under a non-conventional key) - buildTurnSummary deferred until AFTER client resolution to skip the Database.use read when we're no-opping anyway - packages/opencode/src/effect/runtime-flags.ts: - New hivemindLoopEnabled flag (OPENCODE_HIVEMIND_LOOP_ENABLED env var, default false). Opt-in per-tab in Phase 1; planned default-on in Phase 2 after validating in the wild. - packages/opencode/src/session/processor.ts: - Yield MCP.Service via Effect.serviceOption (doesn't leak through Handle.process's never-environment signature; processor still has MCP at runtime via prompt.ts's layer wiring) - case 'step-finish' (after value.reason captured, after summary fork): fires HivemindLoopHook.recordTurnEnd - case 'tool-result' (after completeToolCall): fires HivemindLoopHook.loopProgress - packages/opencode/test/session/hivemind-loop-hook.test.ts (new): - 5 unit tests covering the gating paths: * flag off + MCP=None → silent no-op * flag on + MCP=None → silent no-op (no error) * flag off + (loopProgress) → silent no-op * flag on + MCP=None + (loopProgress) → silent no-op * flag on + MCP=Some (stub w/ empty clients()) → silent no-op (the findHivemindClient miss path) - GRUNTCODE.md: - Documented as patch #5 with the feature flag + behavior. Testing: - bun typecheck (from packages/opencode): green. - bun test test/session/ : 357 pass / 5 skip / 1 todo / 0 fail (was 352 pre-hook; +5 new hook tests). No regressions across the session module (processor-effect.test.ts + compaction.test.ts + all peers in /session still green). - The wake fire-path is exercised end-to-end by the production loop primitive once Phase 1 is enabled per-tab; that's better validated by live use than by mocked MCP calls in unit tests. Refs: - hivemind anomalyco#266 (parent — Phase 1) - hivemind-mcp PR #18 (Phase 0 — schema + 6 tools) - hivemind-mcp PR #20 (await-review decision branch — receiver-side already live on hivemind-mcp main as of 65a1020) - AGENTS.md + hivemind-peers.md three-layer goal-loop contract (the behavioral rules this PR mechanically enforces)

github-actions Bot added needs:title needs:compliance labels May 27, 2026

terrxo merged commit fd4aa6b into dev May 27, 2026
3 of 11 checks passed

terrxo mentioned this pull request May 27, 2026

feat(opencode/session): default-on hivemind loop primitive (#266 Phase 2) #23

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feat(grunt/tui): turn-end hook → hivemind loop primitive (#266 Phase 1)#21

feat(grunt/tui): turn-end hook → hivemind loop primitive (#266 Phase 1)#21
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terrxo commented May 27, 2026

Hivemind anomalyco#266 Phase 1 — gruntcode side

Architecture

Feature flag

Files

Hard correctness rule: hook MUST NEVER break the TUI

Testing

How to enable per-tab

Refs

Out of scope

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terrxo commented May 27, 2026

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