refactor: Hub-only gateway architecture + agent collaboration overhaul#36
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yishuiliunian merged 1 commit intomainfrom Mar 28, 2026
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…overhaul Migrate from "every agent is a TCP server" to "Hub is the sole gateway, agents are pure stdio workers". This restructures the entire multi-agent communication, lifecycle management, and tool system. Hub Architecture: - Hub owns all agent connections (stdio for agents, TCP for external clients) - Agent processes no longer open TCP ports (tcp_accept.rs deleted) - Hub manages agent spawn, completion detection, and cascade shutdown - Explicit agent/completed protocol (not relying on EOF alone) - Agent topology table tracking parent/child relationships and lifecycle - Permission/question relay through Hub with 30s timeout Completion Chain (was completely broken, now reliable): - Non-interactive agent server auto-exits after session completes - Hub captures real agent output (from ToolResult/Stream events) - hub/wait_agent spawned as background task (doesn't block IO loop) - Race-safe: emit_agent_finished before unregister + finished_outputs cache - 10-minute timeout on wait_agent to prevent infinite hangs Agent Collaboration Tools (redesigned): - Agent tool: self-contained with action=spawn/result/status - SendMessage: simplified to point-to-point Hub routing only - Removed: Channel tool (unreliable pull model), TaskOutput/TaskStop tools - Bash tool: integrated background process management (process_id param) - Tools reorganized: collaboration/ subdirectory for multi-agent tools Deleted (legacy point-to-point): - MessageRouter, AgentRegistry, Channel/ChannelStore - tcp_accept.rs, bridge event forwarding - 5 hub/channel protocol methods, hub/broadcast - TaskOutputTool, TaskStopTool (merged into Bash) Bug Fixes: - Loop detector warning no longer breaks tool_use/tool_result pairing - normalize_messages ensures ToolResult blocks before Text blocks - Spawn failure cleanup (kills orphan processes) - Parent validation on agent registration
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Summary
Changes
Hub Architecture (loopal-agent-hub):
agent/completedprotocol (primary signal, EOF as fallback)hub/wait_agentruns as background task (no IO loop blocking)hub/agent_info,hub/topologyquery methodsAgent Tools (loopal-agent):
tools/collaboration/agent.rs: Agent tool with action=spawn/result/statustools/collaboration/send_message.rs: Point-to-point only (no broadcast/shutdown)Process Tools (tools/process):
Completion Chain Fixes:
104 files changed, +4378/-2844
Test plan
cargo clippy --workspace --tests— zero warningscargo test --workspace— 1632 tests pass