Orchestration Blackboard

A filesystem-backed blackboard that makes real multi-round orchestration possible without Claude Code CLI changes.

The problem it solves

Parallel subagents can't see each other. In one observed 7-agent council run, Rounds 2 and 3 ("cross-critique" and "consensus synthesis") had to be faked by the orchestrator reading all 7 Round-1 outputs and synthesizing in-context. Real multi-round deliberation — where Round-2 agents read Round-1 outputs and critique — was impossible without a shared store.

The primitive

Two MCP tools exposed by the claude-code-expert MCP server:

• cc_blackboard_append({ run_id, round, role, findings }) — append-only per triple
• cc_blackboard_read({ run_id, round?, role? }) — read with optional filters