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.
Hook
Runs before the agent uses a tool for Write, Edit, MultiEdit, Bash, mcp__filesystem__(write_file, edit_file, move_file), WebSearch, WebFetch, mcp__brave-search__.* and mcp__fetch__fetch tool calls, executing gate.sh, discovery-gate.sh, brownfield-gate.sh, scope-gate.sh, framework-guard.sh…
Hook
Runs after a tool call finishes for Write, Edit, MultiEdit and Read tool calls, executing post-write-nudge.sh, change-log.sh, diamond-state-audit.sh and read-log.sh via bash (4 commands). From haabe/mycelium.
Hook
Runs when a tool call fails for Bash tool calls, executing reflexion-gate.sh via bash. From haabe/mycelium.
Hook
Runs when the agent finishes a response, executing stop-check.sh and ci-signal.sh via bash (2 commands). From haabe/mycelium.
Hook
Runs when a session starts on startup, resume, clear and fork, executing session-start.sh and ci-signal.sh via bash with --session-start (2 commands). From haabe/mycelium.
Hook
Runs when you submit a prompt, before the agent sees it, executing preflight.sh and discovery-trigger-guard.sh via bash (2 commands). From haabe/mycelium.