devils-advocate SKILL.md skillA
devils-advocate 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/devils-advocate@git:20261008.fc240eaPins git:20261008.fc240ea 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/devils-advocate/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261008.fc240ea, committed Oct 8, 2026
- First version recorded
- May 25, 2026
- Size
- 13,754 bytes
- Repository stars
- 47
- License
- MIT
Systematically challenge current assumptions before major decisions. Counters confirmation bias, groupthink, and overconfidence.
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
# Devil's Advocate
Run before every major diamond transition and architecture decision. Source: Kahneman, Shotton.
## Technique 1: Pre-Mortem
Imagine it's 6 months from now and this decision FAILED spectacularly.
1. What went wrong?
2. What assumption was the weakest link?
3. What signal did we ignore?
4. Who was affected and how?
## Technique 2: Assumption Reversal
For each key assumption:
- State the assumption explicitly
- Ask: "What if the OPPOSITE is true?"
- What evidence would support the opposite?
- Is there any evidence we've dismissed? Include language read by its words: a quote that never used our term may still describe the thing, and one that used it may not (`${CLAUDE_PLUGIN_ROOT}/engine/reading-for-meaning.md`).
## Technique 3: Red Team
Attack your own position:
- What would a competitor say about this approach?
- What would a skeptical user say?
- What would a security auditor find?
- What would an accessibility advocate flag?
## 10 Challenge Questions
1. What are we most confident about? (That's where overconfidence hides)
2. What evidence have we dismissed or downweighted?
3. Are we anchored on our first idea? (Shotton - anchoring bias)
…Read the whole file at its exact version.
How to install
mdr add haabe/mycelium/devils-advocate@sha256:2b3d3031421f885dThe line at the top of this page pins the label git:20261008.fc240ea, 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_cehrsm2rhgxkflui)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between May 25, 2026 and Oct 8, 2026, about one every 23 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261008.fc240ea latest | 2026-10-08 | fc240ea | 13,754 B | A | view · diff |
| git:20260922.5c0cbc1 | 2026-09-22 | 5c0cbc1 | 13,569 B | A | view · diff |
| git:20260831.313c45a | 2026-08-31 | 313c45a | 11,703 B | A | view · diff |
| git:20260821.9048795 | 2026-08-21 | 9048795 | 10,900 B | A | view · diff |
| git:20260704.7639f18 | 2026-07-04 | 7639f18 | 6,075 B | A | view · diff |
| git:20260628.1847ca0 | 2026-06-28 | 1847ca0 | 6,075 B | A | view · diff |
| git:20260525.9fac942 | 2026-05-25 | 9fac942 | 5,797 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 (13754 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 · 47 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cehrsm2rhgxkflui GET https://markdownregistry.com/api/v1/resolve?ref=haabe/mycelium/devils-advocate GET https://markdownregistry.com/api/v1/blob/2b3d3031421f885d78e3559f5c39930c0605b09a9e87ee843a567d2b3f8883e2
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.