Add built-in "Skill Validator" multi-agent preset

[PureWeen]

What

Adds a new built-in "Skill Validator" (⚖️) preset to GroupPreset.BuiltIn — a multi-agent group that evaluates skills from two complementary angles and builds a consensus verdict.

How it works

Uses OrchestratorReflect mode with two specialized workers and an orchestrator that synthesizes their findings:

• Worker 1 — Dotnet Skill Validator: Empirical, outcome-focused evaluation using a 5-step methodology:

  1. Inspect the skill definition (SKILL.md + eval.yaml)
  2. Baseline comparison — describe agent behavior without vs. with the skill
  3. Pairwise comparative judgment with position-swap bias mitigation
  4. Statistical confidence assessment across the scenario set
  5. Produce a scored verdict (KEEP / IMPROVE / REMOVE)

• Worker 2 — Anthropic Skill Evaluator: Prompt-design-focused evaluation across 4 dimensions:

  1. Description quality & trigger accuracy (precision/recall rating)
  2. Instruction clarity — actionable, unambiguous, no over-constraint
  3. Scope appropriateness — focused, no overlap with other skills
  4. Test coverage — happy path, edge cases, negative cases

• Orchestrator: Dispatches to both workers, collects independent verdicts, identifies agreements (high confidence) vs. disagreements (requires judgment), and produces a structured consensus report:

  ## Skill Validator Consensus Report: [Skill Name]
  Dotnet Verdict / Anthropic Verdict / Consensus
  Points of Agreement · Points of Disagreement
  Adopted Suggestions · Declined Suggestions (with rationale)
  Final Recommendation
  

Consensus thresholds (defined in SharedContext):

• KEEP = both say KEEP, or one KEEP + one IMPROVE
• IMPROVE = evaluators disagree, or both say IMPROVE
• REMOVE = either says REMOVE with strong evidence

Config: OrchestratorModel: claude-opus-4.6, WorkerModels: 2x claude-sonnet-4.6, MaxReflectIterations: 6

Current State

• ✅ Built-in preset added to PolyPilot/Models/ModelCapabilities.cs
• ✅ New test: BuiltInPresets_IncludeSkillValidator in SessionOrganizationTests.cs
• ✅ Updated Scenario_CreateGroupFromPreset preset count expectation (2 → 3)
• ✅ Build passes — 0 errors, 7 pre-existing warnings
• ✅ 1661 tests pass (1 pre-existing failure: PlatformHelperTests.AvailableModes_OnNonDesktop_IsRemoteOnly, unrelated to this change)
• ✅ Challenger review passed

Files Changed

File	Change
PolyPilot/Models/ModelCapabilities.cs	New "Skill Validator" entry in BuiltIn array (+191 lines)
PolyPilot.Tests/SessionOrganizationTests.cs	New test + updated preset count expectation (+20, -2 lines)

Future Work / Potential Improvements

• Add more granular evaluation rubrics based on real-world skill validation experience
• Integrate with the skill-creator skill to provide an end-to-end skill development workflow (create → validate → iterate)
• Consider a "Skill Validator Lite" broadcast-mode variant for quick single-pass evaluation without a consensus loop
• Could expose consensus thresholds (KEEP/IMPROVE/REMOVE) as configurable preset parameters
• Add eval.yaml scenario examples to the SharedContext to guide workers on what good test cases look like

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Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

[PureWeen]

PR #302 Review — Multi-Model Consensus (5 models, 2+ agreement filter)

PR: Add built-in "Skill Validator" multi-agent preset (DRAFT)
CI: No checks configured
Prior reviews: None
Note: DRAFT PR. The Skill Validator preset (ModelCapabilities.cs) is clean data — no bugs. The runtime watchdog/tool-health changes have significant issues.

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🔴 CRITICAL — MonitorAndSynthesizeAsync hangs orchestrator + off-UI-thread mutation (5/5 models)

CopilotService.Organization.cs — worker re-dispatch loop

The new block sets workerState.Info.IsProcessing = false directly on a background thread (INV-2 violation) and does NOT call state.ResponseCompletion?.TrySetResult(...). Since SendPromptAndWaitAsync blocks on ResponseCompletion.Task, the orchestrator loop awaiting the re-dispatched worker hangs indefinitely. Also missing from INV-1: IsResumed, ProcessingStartedAt, ToolCallCount, ProcessingPhase, ClearPermissionDenials(), FlushCurrentResponse(), OnSessionComplete, diagnostic log tag.

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🔴 CRITICAL — TriggerToolHealthRecovery INV-1 violation (5/5 models)

CopilotService.Events.cs — new method

This 9th path that clears IsProcessing skips 6 required cleanup fields. The missing OnSessionComplete means multi-agent orchestrations listening on this signal are never notified, leaving sessions showing "Thinking..." on mobile clients forever.

Also: TrySetResult uses only CurrentResponse.ToString(), but CompleteResponse uses FlushedResponse + CurrentResponse. If a TurnEnd flush already moved content to FlushedResponse (clearing CurrentResponse), the orchestrator gets an empty string as the worker result.

Missing: IsResumed = false, ProcessingStartedAt = null, ToolCallCount = 0, ProcessingPhase = 0, ClearPermissionDenials(), OnSessionComplete?.Invoke().

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🟡 MODERATE — WatchdogCaseAResets double-increment race (4/5 models)

CopilotService.Events.cs

Both the 30s tool health timer AND the main watchdog Case A path call Interlocked.Increment(ref state.WatchdogCaseAResets) on the same counter. With WatchdogMaxToolAliveResets = 2 and threshold resets > 1: health check fires at T+30s (→1), watchdog fires at T+60s (→2, triggers termination). One stale observation is enough to terminate rather than the intended 2-cycle confirmation — false positives for legitimate long-running tools.

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🟡 MODERATE — CancelToolHealthCheck missing from CompleteResponse / AbortSessionAsync (4/5 models)

CopilotService.Events.cs — CompleteResponse

CompleteResponse calls CancelProcessingWatchdog and CancelTurnEndFallback but not CancelToolHealthCheck. The orphaned timer fires 30s after session completes, finds IsProcessing=false, returns early — no correctness bug, but Timer is never disposed, accumulating leaks at high throughput.

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Test Coverage

BuiltInPresets_IncludeSkillValidator is solid. Missing: (1) TriggerToolHealthRecovery verifies all INV-1 fields cleared; (2) re-dispatch path verifies ResponseCompletion is unblocked; (3) counter test verifying no double-increment.

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⚠️ Request changes (draft — not merge-ready)

The Skill Validator preset config is clean. Three runtime bugs to fix:

1. Add ResponseCompletion?.TrySetResult(...) and wrap in InvokeOnUI in the MonitorAndSynthesizeAsync re-dispatch path
2. Complete INV-1 cleanup in TriggerToolHealthRecovery (6 missing fields + fix empty-content TrySetResult)
3. Separate the WatchdogCaseAResets counter or coordinate so only one path increments per cycle

[PureWeen]

Round 1 review complete — see findings below

[PureWeen]

PR #302 — 5-Model Consensus Review

Title: Add built-in "Skill Validator" multi-agent preset + watchdog/tool-health improvements
CI: ⚠️ No checks configured on feat/skill-validator-preset
Prior reviews: None
Models: claude-opus-4.6 ×2, claude-sonnet-4.6, gemini-3-pro-preview, gpt-5.3-codex

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🔴 CRITICAL — TriggerToolHealthRecovery violates IsProcessing Cleanup Invariant (5/5 models)

PolyPilot/Services/CopilotService.Events.cs — TriggerToolHealthRecovery

The new recovery method sets IsProcessing = false but skips the cleanup required by every other path that clears processing state. Missing:

• CancelProcessingWatchdog(state) — watchdog keeps running, fires a second timeout on the already-recovered session (3/5 models)
• CancelTurnEndFallback(state) — TurnEnd fallback fires ~4s later, calling CompleteResponse on a recovered session; guards prevent double-complete but leave stale companion fields (2/5 models)
• state.Info.IsResumed = false — next turn watchdog uses 30s resume-quiescence instead of 600s tool timeout → premature kill (4/5 models)
• state.Info.ProcessingPhase = 0 — UI stuck showing "Working…" forever (4/5 models)
• state.Info.ProcessingStartedAt = null — elapsed time counter never stops (3/5 models)
• state.SuccessfulToolCountThisTurn = 0 (3/5 models)
• state.WatchdogCaseAResets = 0 — stale count affects next turn's watchdog timeout selection (3/5 models)
• OnSessionComplete?.Invoke(sessionName, ...) — orchestrator worker loops: ResponseCompletion TCS unblocks via TrySetResult but MonitorAndSynthesizeAsync never gets its completion notification, blocking synthesis for up to 60 minutes (4/5 models)

Fix: Replace the manual clear with a call to CompleteResponse(state) (or extract the shared cleanup into a helper), and add CancelProcessingWatchdog(state) + CancelTurnEndFallback(state) before the InvokeOnUI.

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🔴 CRITICAL — MonitorAndSynthesizeAsync clears IsProcessing off the UI thread (3/5 models)

PolyPilot/Services/CopilotService.Organization.cs — MonitorAndSynthesizeAsync

workerState.Info.IsProcessing = false;  // runs on orchestration task thread
Interlocked.Exchange(ref workerState.ActiveToolCallCount, 0);

Per the codebase invariant: "All mutations to state.Info.IsProcessing must be marshaled to the UI thread." This runs on the orchestration background task, racing with watchdog/event handlers. Additionally, ResponseCompletion?.TrySetResult(...) is never called — workers blocked in SendPromptAndWaitAsync awaiting the TCS will never complete, so Task.WhenAll(workerTasks) hangs indefinitely with IsProcessing = false in the UI (2/5 models).

Fix: Wrap in InvokeOnUI(() => { ... }) and add workerState.ResponseCompletion?.TrySetResult(...).

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🔴 CRITICAL — ToolHealthCheckTimer not cancelled in session cleanup paths (2/5 models)

PolyPilot/Services/CopilotService.Events.cs / CopilotService.cs

CancelToolHealthCheck is never called in:

• AbortSessionAsync (cancels watchdog + fallback, but not health check) — stale 30s timer fires on an aborted session; if a new prompt arrives before it fires, the generation guard may not protect it if ProcessingGeneration didn't change
• ReconnectAsync / DisposeAsync session cleanup loops (cancel watchdog + fallback, not health check)
• CloseSessionCoreAsync

After a reconnect, old health-check timers hold closures over old SessionState objects and can fire on detached state.

Fix: Add CancelToolHealthCheck(state) to AbortSessionAsync alongside the existing CancelProcessingWatchdog call, and to the cleanup loops in ReconnectAsync/DisposeAsync.

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🟡 MODERATE — WatchdogCaseAResets shared between two independent systems (4/5 models)

PolyPilot/Services/CopilotService.Events.cs

Both ScheduleToolHealthCheck's timer callback and RunProcessingWatchdogAsync Case A increment WatchdogCaseAResets independently. The watchdog also reads the counter to select between 600s and 60s escalation timeouts (caseAResets > 0). A single stale health check at t=30s sets caseAResets = 1, permanently switching the watchdog to the 10× shorter timeout for the rest of that turn — even if the connection recovers and events resume. With WatchdogMaxToolAliveResets reduced from 3 to 2, a health check fire + watchdog fire in the same cycle could kill a legitimately running tool prematurely.

Fix: Use a separate field for the health check's stale counter (e.g., ToolHealthStaleChecks) instead of sharing WatchdogCaseAResets.

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🟡 MODERATE — WorkerExecutionTimeout 10 min → 60 min regresses remote/demo mode (3/5 models)

PolyPilot/Services/CopilotService.Organization.cs line ~33

ScheduleToolHealthCheck returns early for demo and remote mode. The watchdog's Case A also skips for demo/remote. The 60-minute timeout is the only backstop for workers in these modes. A stuck remote worker now blocks orchestration for a full hour vs. the previous 10 minutes.

Fix: Keep WorkerExecutionTimeout = 60 minutes for non-remote/demo but restore a shorter backstop (e.g., 10 min) for remote/demo mode, or add a separate remote-mode health check mechanism.

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🟡 MODERATE — ScheduleToolHealthCheck timer/cancel race window (3/5 models)

PolyPilot/Services/CopilotService.Events.cs — ScheduleToolHealthCheck

The timer is constructed (and starts counting) before Interlocked.Exchange(ref state.ToolHealthCheckTimer, timer) stores it. A concurrent CancelToolHealthCheck (e.g., from ToolExecutionCompleteEvent) runs between construction and storage, finds the field null (just cleared), and becomes a no-op. The new timer is then stored and runs untracked. The activeTools <= 0 guard in the callback prevents false recovery, but the callback still runs and may reschedule recursively.

Fix: Store the timer before the delay starts, or use a CancellationTokenSource pattern instead of Interlocked on Timer?.

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🟢 MINOR — Dead code after retry loop in ExecuteWorkerAsync (3/5 models)

PolyPilot/Services/CopilotService.Organization.cs — ExecuteWorkerAsync

With maxRetries = 2, attempt = 2 always falls into the unconditional catch (Exception ex) block and returns. The return new WorkerResult(..., "Max retries exceeded", ...) after the loop is unreachable.

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Test Coverage Assessment

The PR adds BuiltInPresets_IncludeSkillValidator (validates preset structure) and updates the preset count test. Missing tests for the new runtime paths:

• TriggerToolHealthRecovery clearing all IsProcessing companion fields (especially IsResumed, ProcessingPhase, ProcessingStartedAt)
• CancelToolHealthCheck being called in AbortSessionAsync / DisposeAsync / ReconnectAsync
• ScheduleToolHealthCheck not firing in demo/remote mode
• WatchdogCaseAResets counter interaction between health check and watchdog
• MonitorAndSynthesizeAsync re-dispatch unblocking ResponseCompletion TCS

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Summary

Issue	Severity	Ship-blocker?
TriggerToolHealthRecovery incomplete cleanup (missing 7+ fields, watchdog, OnSessionComplete)	🔴 CRITICAL	Yes — stale state corrupts next turn; orchestrator loops may hang 60 min
MonitorAndSynthesizeAsync IsProcessing mutation off UI thread + missing TrySetResult	🔴 CRITICAL	Yes — race condition + synthesis deadlock
ToolHealthCheckTimer not cancelled in abort/dispose/reconnect	🔴 CRITICAL	Yes — timer fires on orphaned state after reconnect
WatchdogCaseAResets shared between health check and watchdog	🟡 MODERATE	Yes — can prematurely kill legitimately running tools
WorkerExecutionTimeout 60 min for remote/demo	🟡 MODERATE	Yes — hour-long hang regression
Timer/cancel race in ScheduleToolHealthCheck	🟡 MODERATE	No — mitigated by activeTools guard
Dead code after retry loop	🟢 MINOR	No

⚠️ Request changes — three CRITICAL issues must be addressed before merge. The TriggerToolHealthRecovery cleanup gap is particularly dangerous as it violates the well-documented IsProcessing invariant. The Skill Validator preset itself is clean and uncontroversial.

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5-model review: claude-opus-4.6 ×2, claude-sonnet-4.6, gemini-3-pro-preview, gpt-5.3-codex. Consensus filter: issues flagged by 2+ models only.

[PureWeen]

Round 1 Review

[PureWeen]

PR #302 — Round 2 Re-Review (post fix commit eedf8e59)

CI: ⚠️ No checks configured | Tests: ✅ 2422 passed, 0 failed

Previous Findings Status

#	Round 1 Finding	Status	Evidence
🔴 C1	TriggerToolHealthRecovery INV-1 violation (4 of 12+ fields)	✅ FIXED	Full companion field cleanup added: all 9 fields + CancelProcessingWatchdog + CancelTurnEndFallback + OnSessionComplete + diagnostic log tag
🔴 C2	MonitorAndSynthesizeAsync background-thread IsProcessing=false	✅ FIXED	Wrapped in InvokeOnUI() with companion field cleanup
🟡 M1	WatchdogCaseAResets shared counter double-increment	✅ FIXED	New separate counter ToolHealthStaleChecks — no longer shared with WatchdogCaseAResets
🟡 M2	ToolHealthCheckTimer not cancelled on teardown	✅ FIXED	CancelToolHealthCheck added to all 14 cleanup paths (CompleteResponse, AbortSessionAsync, CloseSessionCoreAsync, DisposeAsync, ReconnectAsync, watchdog timeouts)
🟡 M3	TCS result drops FlushedResponse content	✅ FIXED	Now uses FlushedResponse + CurrentResponse like CompleteResponse

New Issues (Round 2)

None found. All 5 Round 1 findings are resolved.

Test Coverage Gap (non-blocking)

Zero unit tests for the new ToolHealthCheckTimer code paths. Suggested additions:

1. ToolHealthCheck_CompletedTool_DoesNotTriggerRecovery
2. ToolHealthCheck_StaleEvents_TriggersRecovery
3. WatchdogMaxToolAliveResets_BoundsMaxStuckTime_WithEscalation
4. TriggerToolHealthRecovery_NotifiesOnSessionComplete

Verdict: ✅ Approve

All critical and moderate findings from Round 1 have been addressed. Tests pass (2422/2422). The missing test coverage for ToolHealthCheckTimer paths is noted but non-blocking — the existing watchdog tests cover the broader processing-state invariants.