Fan out

Skill haabe/mycelium/plugins/mycelium/skills/fan-out

AI made building cheap. It didn't make deciding cheap. Mycelium is a Claude Code harness that makes your agent run discovery and weigh evidence before it writes code. It earns the right to start. Built for software, courses, AI tools, and services.

Install

npx -y skills add haabe/mycelium --skill fan-out

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What its author says it does

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Parallel agent orchestration for OST exploration. Fan-out multiple solution explorations, fan-in results to compare and select winners.

SKILL.md

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Fan-Out / Fan-In Orchestration

When to Use

OST has 2+ solutions for the same opportunity that need parallel exploration
Independent delivery work items that can be parallelized
Multiple research streams needed simultaneously

Workflow

1. Prepare (Lead Agent)

Read .claude/canvas/opportunities.yml
Identify solutions needing parallel work
For each: identify riskiest assumption and design test

2. Fan-Out (Spawn Workers)

For each solution:

Spawn subagent or Agent Team member
Provide: clear task, read-only canvas context, worktree isolation, time bound
Each worker runs independently

3. Fan-In (Collect Results)

Collect all worker results
Update ICE scores in canvas
Run /mycelium:bias-check on combined findings
Select winner(s) based on evidence
Log decision in .claude/harness/decision-log.md

Leaf Bakeoff Mode

When comparing competing OST leaves for the same opportunity:

Each worker returns a structured scorecard (Four Risks + ICE + assumption test result + segment fit)
Lead agent applies winner selection rules: clear winner (>20% ICE delta), close race (tiebreaker), segment split (both advance), both fail (archive and re-evaluate)
Losers are archived to .claude/canvas/archived-solutions.yml with full evidence snapshot

See ${CLAUDE_PLUGIN_ROOT}/orchestration/leaf-bakeoff.md for the complete bakeoff protocol.

Rules

Workers NEVER write to canvas (lead agent does)
Workers NEVER progress diamonds
Lead agent ALWAYS runs bias check on combined results
Minimum 2 workers for meaningful comparison
Maximum 3 leaves per bakeoff (respects L3 WIP ceiling)

See ${CLAUDE_PLUGIN_ROOT}/orchestration/agent-teams.md for full orchestration patterns.