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Based on Anthropic's effective harnesses research.
New modules:
- Omni/Agent/AuditLog.hs: JSONL audit logging with SubagentId linking
- Omni/Agent/Tools/AvaLogs.hs: Tool for Ava to query her own logs
- Omni/Agent/Subagent/HARDENING.md: Design documentation
Key features:
- SubagentHandle with TVar status for async execution and polling
- spawnSubagentAsync, querySubagentStatus, waitSubagent, cancelSubagent
- User confirmation: spawn_subagent requires confirmed=true after approval
- Audit logs stored in $AVA_DATA_ROOT/logs/{ava,subagents}/
- CLI: ava logs [--last=N] [<subagent_id>]
- read_ava_logs tool for Ava self-diagnosis
Tasks: t-267, t-268, t-269, t-270, t-271
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Enables orchestrator to spawn specialized subagents for focused tasks:
- WebCrawler: web search + page reading (haiku, fast)
- CodeReviewer: code analysis tools (sonnet, thorough)
- DataExtractor: structured data extraction (haiku)
- Researcher: combined web + codebase research (sonnet)
Key features:
- spawn_subagent tool with role-based tool selection
- Per-subagent resource limits (timeout, cost, tokens)
- Structured output with citations (claim, source_url, quote)
- Separate API keys for OpenRouter vs Kagi
- Efficiency-focused system prompts
Defaults: 200k tokens, $1.00 cost cap, 600s timeout, 20 iterations
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