Retro Futurism
sickn33/agentic-awesome-skills
Web and App implementation guide for Retro Futurism. An agent skill from sickn33/agentic-awesome-skills.
Identify the pivotal obstacle between current state and desired future.
MITAuto-check passed
Install Crux Diagnosis
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install itseffi/agentic-os crux-diagnosis --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/crux-diagnosis .claude/skills/crux-diagnosis && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .claude/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosisType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install itseffi/agentic-os crux-diagnosis --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/crux-diagnosis .agents/skills/crux-diagnosis && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .agents/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install itseffi/agentic-os crux-diagnosis --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/crux-diagnosis .cursor/skills/crux-diagnosis && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .cursor/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/itseffi/agentic-os.git --path .agents/skills/crux-diagnosis--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install itseffi/agentic-os crux-diagnosis --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/crux-diagnosis .gemini/skills/crux-diagnosis && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .gemini/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install itseffi/agentic-os crux-diagnosisInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/crux-diagnosis .github/skills/crux-diagnosis && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .github/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add itseffi/agentic-os --skill crux-diagnosis -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install itseffi/agentic-os crux-diagnosis --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/itseffi/agentic-os.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/crux-diagnosis .opencode/skills/crux-diagnosis && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "crux-diagnosis" agent skill from https://github.com/itseffi/agentic-os/tree/main/.agents/skills/crux-diagnosis into .opencode/skills/crux-diagnosis/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "crux-diagnosis", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
crux-diagnosis- GitHub stars
- 114
- Token cost
- ~504 tokens
- SKILL.md length
- 251 words
- Files
- 2
- Skills in repo
- 23
- Repo updated
- First seen
- Licence
- MIT
At a glance
Identify the pivotal obstacle between current state and desired future.
- Works in 4 steps: Map Current to Future → Score Each Blocker → Identify the Crux → …
- Developing strategy
- SKILL.md covers When to Use, The Concept, Required Inputs and The Process, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Crux Diagnosis is an agent skill from itseffi/agentic-os. Identify the pivotal obstacle between current state and desired future. Use when developing strategy.
Its SKILL.md is about 500 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
The repository describes itself as: Agentic personal OS to automate high-leverage workflows with Codex, Claude Code, Pi, OpenClaw and other coding agents/ runtime platforms. The licence is MIT.
When your agent uses it
- Developing strategy
Example prompts
- “/crux-diagnosis”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit e54d0ac. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Crux Diagnosis loads about 504 tokens when it runs. Until then it costs about 29 tokens; SKILL.md has 251 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from itseffi/agentic-os at commit e54d0ac, republished under its MIT licence (© itseffi). 251 words, ~504 tokens.
Download SKILL.mdSave it as
.claude/skills/crux-diagnosis/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- crux-diagnosis
- description
- Identify the pivotal obstacle between current state and desired future. Use when developing strategy.
Strategic Crux Diagnosis
Identify the pivotal obstacle between current state and desired future.
When to Use
When developing strategy or facing complex strategic decisions.
The Concept
Crux: The smallest set of obstacles that, if solved, makes everything else tractable or unnecessary.
Required Inputs
Gather before analysis:
- Current state (baseline metrics, capabilities)
- Desired future (time-bound outcome, targets)
- Constraints (budget, headcount, tech, compliance)
- Available assets (data, channels, IP, partnerships)
- Key risks and non-negotiables
The Process
1. Map Current to Future
Create a causal graph:
- Start: Current state
- End: Desired future
- List all blockers in between
2. Score Each Blocker
Evaluate on:
- Causal centrality: How much else depends on this?
- Bottleneck severity: How much does it slow everything?
- Solvability: Can we actually fix it?
- Leverage potential: If solved, how much unlocks?
- Time to impact: How fast could we see results?
- Evidence strength: How sure are we this is the problem?
3. Identify the Crux
Find the blocker(s) where:
- Solving it unlocks the most downstream progress
- It's actually solvable given constraints
- Time to impact is acceptable
4. Generate Strategic Options
Create 4-7 options aimed at the crux:
- Include at least one non-obvious approach
- Include at least one constraint-relaxation option
- Evaluate against decision criteria
Output
- Executive summary (situation, crux, approach)
- Evidence pack (facts, assumptions, uncertainties)
- Crux definition with scoring
- Options comparison table
- Chosen strategy with rationale
- Strategic moves (3-5) with owners and timelines
When Not to Use
Do not use this skill when the request is unrelated, low-stakes, or better handled by a simpler direct response.
© itseffi, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in .agents/skills/crux-diagnosis of itseffi/agentic-os.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit e54d0ac
Compare with similar skills
Crux Diagnosis next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Crux Diagnosis this skillitseffi/agentic-os | 114 | — | ~504 | Automated safety check: Pass | MIT | |
| Retro Futurismsickn33/agentic-awesome-skills | 47k | 1 repos | ~2.3k | Automated safety check: Pass | MIT | |
| Identifybrycewang-stanford/Auto-Empirical-Research-Skills | 4.6k | — | ~1.3k | Automated safety check: Pass | Custom licence | |
| Identify Assumptions Existingphuryn/pm-skills | 27k | — | ~525 | Automated safety check: Pass | MIT | |
| Identify Assumptions Newphuryn/pm-skills | 27k | — | ~807 | Automated safety check: Pass | MIT | |
| Search Fail PivotHKUDS/OpenSpace | 7.8k | — | ~1.1k | Automated safety check: Pass | MIT |
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Identify
brycewang-stanford/Auto-Empirical-Research-Skills
Design or review identification strategy for the sewage-house-prices project.
Identify Assumptions Existing
phuryn/pm-skills
Identify risky assumptions for a feature idea in an existing product across Value, Usability, Viability, and Feasibility.
Identify Assumptions New
phuryn/pm-skills
Identify risky assumptions for a new product idea across 8 risk categories including Go-to-Market, Strategy, and Team.
Search Fail Pivot
HKUDS/OpenSpace
Heuristic for detecting search tool failures and pivoting to domain knowledge for document generation
Binance Futures
alsk1992/CloddsBot
Binance Futures trading with DB tracking. An agent skill from alsk1992/CloddsBot.
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Questions about Crux Diagnosis
What does Crux Diagnosis do?
Identify the pivotal obstacle between current state and desired future. Crux Diagnosis is an agent skill from itseffi/agentic-os. Identify the pivotal obstacle between current state and desired future.
When should I use Crux Diagnosis?
Crux Diagnosis fits situations like: developing strategy.
How do I install Crux Diagnosis in Claude Code?
Run `npx skills add itseffi/agentic-os --skill crux-diagnosis -a claude-code`. Or copy the skill folder (.agents/skills/crux-diagnosis in itseffi/agentic-os) into .claude/skills/crux-diagnosis in your project. Claude Code loads it when a task matches its description.
How do I install Crux Diagnosis in Codex?
Run `npx skills add itseffi/agentic-os --skill crux-diagnosis -a codex`. Or copy the skill folder (.agents/skills/crux-diagnosis in itseffi/agentic-os) into .agents/skills/crux-diagnosis in your project. Codex loads it when a task matches its description.
Can I use Crux Diagnosis in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add itseffi/agentic-os --skill crux-diagnosis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/crux-diagnosis, .gemini/skills/crux-diagnosis, .github/skills/crux-diagnosis and .opencode/skills/crux-diagnosis in your project.
What does Crux Diagnosis need to run?
SKILL.md names no scripts, command-line tools or credentials: Crux Diagnosis is instructions for the agent only.
Does Crux Diagnosis access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Crux Diagnosis safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Crux Diagnosis use?
Crux Diagnosis is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Crux Diagnosis use?
About 504 tokens (SKILL.md is roughly 2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Crux Diagnosis?
Skills that share tags, products or a category with Crux Diagnosis: Retro Futurism (sickn33/agentic-awesome-skills, 47k stars), Identify (brycewang-stanford/Auto-Empirical-Research-Skills, 4.6k stars), Identify Assumptions Existing (phuryn/pm-skills, 27k stars) and Identify Assumptions New (phuryn/pm-skills, 27k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Crux Diagnosis?
itseffi (a GitHub user) maintains it in itseffi/agentic-os, which has 114 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.
Source: itseffi/agentic-os on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.