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scaffold-cost-check

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Measure Mycelium's own scaffold token cost (CLAUDE.md + engine + harness + canvas + memory) and surface a structured estimate. One-shot audit; pair with /framework-health for trend tracking.

plugins/mycelium/skills/scaffold-cost-check/SKILL.md

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Nov 6, 2026
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# Scaffold Cost Check

Measure the token cost of Mycelium's stable scaffolding — the context surface loaded at SessionStart and on routine canvas/memory reads — so claims about "negligible overhead" are auditable. Datadog's *State of AI Engineering* (2026) reports ~69% of input tokens across production agents are system prompts; this skill makes Mycelium's analogous number visible.

## When to Use

- First-time audit on a project to compare actual scaffold cost against any "~6K negligible" claim in landscape/positioning.
- Periodic refresh via `/mycelium:framework-health` (see Wiring below).
- Before adding a new canvas file or harness doc that joins the stable load surface, to surface the marginal cost.

## 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. This skill only WRITES if explicitly asked to persist its output to `dora-metrics.yml#apex.scaffold_token_estimate`; default behavior is print-only.
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