Individual skill
ost-builder
Use to build or update an Opportunity Solution Tree from research data. Never from brainstorming.
plugins/mycelium/skills/ost-builder/SKILL.md
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- Network or broad shell
- Last checked
- Nov 6, 2026
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- 51
- Repository last updated
- Nov 6, 2026
- License
- MIT
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- claude-code Repository topic
- ai-agent Repository topic
- delivery Repository topic
- devops Repository topic
- discovery Repository topic
- product-development Repository topic
- product-management Repository topic
- claude-code-skills Repository topic
- dora-metrics Repository topic
- product-discovery Repository topic
- data Derived category
- research Derived category
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# OST Builder Skill
Build and maintain Opportunity Solution Trees from research evidence.
## Preflight: Read target canvas file(s) before any Write/Edit
**Hard rule.** Before issuing `Write` or `Edit` against any `.claude/canvas/*.yml`, use the **Read tool** on that file in this session. Claude Code's Read-before-Write check requires the `Read` tool specifically — `cat`/`head`/`grep` via Bash do NOT satisfy it.
**Edit vs Write — different cost profiles** (verified 2026-05-14):
- **`Edit`** (exact-string replacement): `Read` with `limit: 1` satisfies the check at ~50 tokens. State-tracking is per-file, not per-byte — subsequent `Edit` calls work anywhere in the file. Use this for partial updates against large canvas files (e.g., `purpose.yml` at 800+ lines).
- **`Write`** (full replacement): do a **full Read** first. Write obliterates the file; you should see what you're about to replace. The `limit:1` shortcut is *not* appropriate here.
**ID-bearing entries — scan the ID space before assigning** (added 2026-05-15, v0.23.19): When adding a new component, opportunity, solution, or any other ID-bearing entry to a canvas file, run a Bash grep first to confirm the next ID in your prefix sequence is actually free:
