Robius State Management
sickn33/agentic-awesome-skills
CRITICAL: Use for Robius state management patterns. An agent skill from sickn33/agentic-awesome-skills.
Test a product, API, utility, or design by stating what it actually does in one sentence.
Custom licenceAuto-check passed
Install One Sentence Test
$ npx skills add EpicenterHQ/epicenter --skill one-sentence-test -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install EpicenterHQ/epicenter one-sentence-test --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/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/one-sentence-test .claude/skills/one-sentence-test && 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 "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .claude/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-testType 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 EpicenterHQ/epicenter --skill one-sentence-test -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install EpicenterHQ/epicenter one-sentence-test --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/one-sentence-test .agents/skills/one-sentence-test && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .agents/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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 EpicenterHQ/epicenter --skill one-sentence-test -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install EpicenterHQ/epicenter one-sentence-test --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/one-sentence-test .cursor/skills/one-sentence-test && 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 "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .cursor/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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/EpicenterHQ/epicenter.git --path .agents/skills/one-sentence-test--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 EpicenterHQ/epicenter --skill one-sentence-test -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install EpicenterHQ/epicenter one-sentence-test --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/one-sentence-test .gemini/skills/one-sentence-test && 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 "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .gemini/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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 EpicenterHQ/epicenter one-sentence-testInstalls 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 EpicenterHQ/epicenter --skill one-sentence-test -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/one-sentence-test .github/skills/one-sentence-test && 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 "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .github/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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 EpicenterHQ/epicenter --skill one-sentence-test -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install EpicenterHQ/epicenter one-sentence-test --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/one-sentence-test .opencode/skills/one-sentence-test && 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 "one-sentence-test" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/one-sentence-test into .opencode/skills/one-sentence-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "one-sentence-test", 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
one-sentence-test- GitHub stars
- 4.8k
- Token cost
- ~2.2k tokens
- SKILL.md length
- 1,087 words
- Files
- 1
- Skills in repo
- 65
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Test a product, API, utility, or design by stating what it actually does in one sentence.
- Works in 3 steps: Strip-docs reduction. Ignore the name,… → Default-config reduction. Specialize:… → Caller-need check. Does the caller's use…
- Auditing coherence
- SKILL.md covers Application A: Cohesion Audit…, Application B: Value-Add Audit…, Common Reveals and Anti-Patterns, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
One Sentence Test is an agent skill from EpicenterHQ/epicenter. Test a product, API, utility, or design by stating what it actually does in one sentence. Use when auditing coherence or looking for orphaned surfaces, duplicate verbs, or inert abstractions, not for plain code-comprehension questions.
Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Open-source, local-first apps.
When your agent uses it
- Auditing coherence
- Looking for orphaned surfaces
- Duplicate verbs
- Inert abstractions
Example prompts
- “/one-sentence-test”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Strip-docs reduction. Ignore the name, JSDoc, README. Read the body. Finish this sentence in plain language: *"This function __."* No…
- Default-config reduction. Specialize: *"Under the defaults actually in use, this function __."* Features gated behind non-default options…
- Caller-need check. Does the caller's use case actually need the default-config version? If not, you've found a mismatch: wrong tool, wrong…
What it can do on your machine
Read from SKILL.md and the folder at commit 5b4bb69. 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
One Sentence Test loads about 2.2k tokens when it runs. Until then it costs about 63 tokens; SKILL.md has 1,087 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,087 words (~2,163 tokens).
“Related skills: use post-implementation-review when the sentence is part of a post-change second read, and rethink when the sentence drives an API, ownership, lifecycle, or package boundary change.”
- name
- one-sentence-test
- metadata.author
- epicenter
- metadata.version
- 2.0
Files
Just SKILL.md in .agents/skills/one-sentence-test of EpicenterHQ/epicenter.
Open the folder on GitHubat commit 5b4bb69
Compare with similar skills
One Sentence Test 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 |
|---|---|---|---|---|---|---|
| One Sentence Test this skillEpicenterHQ/epicenter | 4.8k | — | ~2.2k | Automated safety check: Pass | Custom licence | |
| Robius State Managementsickn33/agentic-awesome-skills | 47k | 2 repos | ~3.3k | Automated safety check: Pass | MIT | |
| State Managementcompozy/compozy | 2.8k | — | ~2.5k | Automated safety check: Pass | MIT | |
| You Might Not Need Statesimstudioai/sim | 30k | — | ~672 | Automated safety check: Pass | Apache-2.0 | |
| Sync State Invariantsopenchamber/openchamber | 11k | — | ~2.7k | Automated safety check: Pass | MIT | |
| Project State Governorsickn33/agentic-awesome-skills | 47k | 1 repos | ~4.6k | Automated safety check: Pass | Apache-2.0 |
Similar skills
State Management
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You Might Not Need State
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Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns
Sync State Invariants
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A skill your agent uses when changing session synchronization, bootstrap or reconnect state, event reducers, polling, optimistic updates, message queues, live activity, ordering/reconciliation…
Project State Governor
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Govern evidence-backed canonical project state across sessions, branches, reviews, and research cycles without inventing product intent.
Bdi Mental States
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More from EpicenterHQ/epicenter
All 65 skills in this repoAgent Instructions
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Write and maintain repository guidance across AGENTS.md, CLAUDE.md, and .agents/skills.
Consult Claude
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Assign Claude Code a read-only investigation, recommendation, or finished text draft.
Better Auth Security Best Practices
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Better Auth security hardening: rate limits, secrets, CSRF, trusted origins, cookies, sessions, OAuth tokens, and audit logging.
Cohesion Over Testability
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Collapse test-shaped production boundaries while preserving behavior and coverage.
Collapse Pass
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Remove indirection that does not earn its boundary across a diff or package.
Error Handling
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Apply Wellcrafted Result patterns to fallible operations and preserve failures at boundaries.
Questions about One Sentence Test
What does One Sentence Test do?
Test a product, API, utility, or design by stating what it actually does in one sentence. One Sentence Test is an agent skill from EpicenterHQ/epicenter. Test a product, API, utility, or design by stating what it actually does in one sentence.
When should I use One Sentence Test?
One Sentence Test fits situations like: auditing coherence; looking for orphaned surfaces; duplicate verbs; inert abstractions.
How do I install One Sentence Test in Claude Code?
Run `npx skills add EpicenterHQ/epicenter --skill one-sentence-test -a claude-code`. Or copy the skill folder (.agents/skills/one-sentence-test in EpicenterHQ/epicenter) into .claude/skills/one-sentence-test in your project. Claude Code loads it when a task matches its description.
How do I install One Sentence Test in Codex?
Run `npx skills add EpicenterHQ/epicenter --skill one-sentence-test -a codex`. Or copy the skill folder (.agents/skills/one-sentence-test in EpicenterHQ/epicenter) into .agents/skills/one-sentence-test in your project. Codex loads it when a task matches its description.
Can I use One Sentence Test 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 EpicenterHQ/epicenter --skill one-sentence-test -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/one-sentence-test, .gemini/skills/one-sentence-test, .github/skills/one-sentence-test and .opencode/skills/one-sentence-test in your project.
What does One Sentence Test need to run?
SKILL.md names no scripts, command-line tools or credentials: One Sentence Test is instructions for the agent only.
Does One Sentence Test 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 One Sentence Test 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 One Sentence Test use?
One Sentence Test has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does One Sentence Test use?
About 2.2k tokens (SKILL.md is roughly 8.7k 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 One Sentence Test?
Skills that share tags, products or a category with One Sentence Test: Robius State Management (sickn33/agentic-awesome-skills, 47k stars), State Management (compozy/compozy, 2.8k stars), You Might Not Need State (simstudioai/sim, 30k stars) and Sync State Invariants (openchamber/openchamber, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains One Sentence Test?
EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,822 GitHub stars. The repository holds 65 skills in this directory. The repository was last updated on October 8, 2026.
Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.