scaffold-cost-check SKILL.md skillA
scaffold-cost-check from haabe/mycelium is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add haabe/mycelium/scaffold-cost-check@git:20260726.151b371Pins git:20260726.151b371 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- haabe/mycelium
- Path
plugins/mycelium/skills/scaffold-cost-check/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260726.151b371, committed Jul 26, 2026
- First version recorded
- Jun 7, 2026
- Size
- 6,371 bytes
- Repository stars
- 51
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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. ## Workflow …
Read the whole file at its exact version.
How to install
mdr add haabe/mycelium/scaffold-cost-check@sha256:0ec09e89607d7e4fThe line at the top of this page pins the label git:20260726.151b371, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ema54z6srmil2byd)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 7, 2026 and Jul 26, 2026, about one every 25 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260726.151b371 latest | 2026-07-26 | 151b371 | 6,371 B | A | view · diff |
| git:20260704.7639f18 | 2026-07-04 | 7639f18 | 5,968 B | A | view · diff |
| git:20260607.73fb436 | 2026-06-07 | 73fb436 | 5,968 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6371 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
haabe/mycelium · 51 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ema54z6srmil2byd GET https://markdownregistry.com/api/v1/resolve?ref=haabe/mycelium/scaffold-cost-check GET https://markdownregistry.com/api/v1/blob/0ec09e89607d7e4fbb037cb0851cbadcb63c8d89587b572b067d253f16876a3b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.