ost-builder skillA
ost-builder is agent-read markdown (skill) from haabe/mycelium: Use to build or update an Opportunity Solution Tree from research data. Never from brainstorming..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
How to install
mdr add haabe/mycelium/ost-builder@git:20260822.2c9fea0mdr add haabe/mycelium/ost-builder@sha256:0c6cee22e45531fdPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_xgr4s6z2slkswrms)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260822.2c9fea0 latest | 2026-08-22 | 2c9fea0 | 13,667 B | A | view · diff |
| git:20260813.418137c | 2026-08-13 | 418137c | 12,652 B | A | view · diff |
| git:20260805.d65286e | 2026-08-05 | d65286e | 12,023 B | A | view · diff |
| git:20260730.d47f9e6 | 2026-07-30 | d47f9e6 | 10,980 B | A | view · diff |
| git:20260704.7639f18 | 2026-07-04 | 7639f18 | 10,631 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 (13667 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 · 45 stars · license MIT · pushed 2026-09-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xgr4s6z2slkswrms GET https://markdownregistry.com/api/v1/resolve?ref=haabe/mycelium/ost-builder GET https://markdownregistry.com/api/v1/blob/0c6cee22e45531fde55306e2fc2a036b6df8fcb1660f8d818808680da1bf242b