opus-extended-thinking SKILL.md skillA
opus-extended-thinking from frankxai/claude-skills-library is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add frankxai/claude-skills-library/opus-extended-thinking@v2.1.0Pins v2.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- frankxai/claude-skills-library
- Path
free-skills/opus-extended-thinking/SKILL.md- Versions recorded
- 3
- Latest version
- v2.1.0, committed Sep 19, 2026
- First version recorded
- May 25, 2026
- Size
- 11,786 bytes
- Repository stars
- 47
- License
- MIT
Use Claude's extended/adaptive thinking for deep reasoning, complex analysis, and multi-step synthesis — both the prompt patterns that elicit deliberation and the current thinking API (adaptive thinking + the effort parameter). Use when a problem needs thorough deliberation before answering, or when configuring thinking on a Claude request.
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
# Extended & Adaptive Thinking
This skill covers Claude's ability to reason deeply before responding — both the **prompt patterns**
that elicit genuine deliberation (model-agnostic, below) and the **current thinking API** (how to
turn it on and tune its depth). It applies to the current Claude family: **Fable 5** (most capable),
**Opus 5** (default), **Sonnet 5**, and **Haiku 4.5**.
> Model IDs and API details move fast. This skill is dated; always confirm against
> **[platform.claude.com](https://platform.claude.com/docs/en/build-with-claude/adaptive-thinking)**.
---
## How thinking works today (the API)
The modern control is **adaptive thinking** plus the **`effort`** parameter — *not* a fixed token
budget. The older `thinking: {type: "enabled", budget_tokens: N}` is **deprecated on Opus 4.6 and
removed (returns a 400) on Opus 4.7, Opus 4.8, and Fable 5** — do not use it on current models.
```python
# Current pattern (Opus 5, Sonnet 5, and the older Opus 4.8 / 4.7 / 4.6, Sonnet 4.6)
response = client.messages.create(
model="claude-opus-5",
max_tokens=16000,
thinking={"type": "adaptive", "display": "summarized"}, # default display is "omitted"
…Read the whole file at its exact version.
How to install
mdr add frankxai/claude-skills-library/opus-extended-thinking@sha256:ca4471732385bc1aThe line at the top of this page pins the label v2.1.0, 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_usppta5bcvev6qrh)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 25, 2026 and Sep 19, 2026, about one every 59 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v2.1.0 latest | 2026-09-19 | d800c14 | 11,786 B | A | view · diff |
| v2.0.0 | 2026-06-22 | 279de9d | 11,414 B | A | view · diff |
| v1.0.0 | 2026-05-25 | 468c26e | 8,733 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 (11786 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
frankxai/claude-skills-library · 47 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_usppta5bcvev6qrh GET https://markdownregistry.com/api/v1/resolve?ref=frankxai/claude-skills-library/opus-extended-thinking GET https://markdownregistry.com/api/v1/blob/ca4471732385bc1a172d99d4734c3a6c7fb9546e4597941abbe8dfe69ddf22ae
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.
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