Rust Ownership Borrowing
hashgraph-online/awesome-codex-plugins
Design and review Rust ownership, borrowing, lifetimes, and interior mutability so data flow matches the domain model.
CRITICAL: Use for ownership/borrow/lifetime issues. An agent skill from fjrevoredo/mini-diarium.
MITAuto-check passed
Install M01 Ownership
$ npx skills add fjrevoredo/mini-diarium --skill m01-ownership -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install fjrevoredo/mini-diarium m01-ownership --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/fjrevoredo/mini-diarium.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/m01-ownership .claude/skills/m01-ownership && 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 "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .claude/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownershipType 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 fjrevoredo/mini-diarium --skill m01-ownership -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install fjrevoredo/mini-diarium m01-ownership --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fjrevoredo/mini-diarium.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/m01-ownership .agents/skills/m01-ownership && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .agents/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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 fjrevoredo/mini-diarium --skill m01-ownership -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install fjrevoredo/mini-diarium m01-ownership --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fjrevoredo/mini-diarium.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/m01-ownership .cursor/skills/m01-ownership && 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 "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .cursor/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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/fjrevoredo/mini-diarium.git --path .agents/skills/m01-ownership--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 fjrevoredo/mini-diarium --skill m01-ownership -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install fjrevoredo/mini-diarium m01-ownership --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fjrevoredo/mini-diarium.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/m01-ownership .gemini/skills/m01-ownership && 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 "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .gemini/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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 fjrevoredo/mini-diarium m01-ownershipInstalls 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 fjrevoredo/mini-diarium --skill m01-ownership -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/fjrevoredo/mini-diarium.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/m01-ownership .github/skills/m01-ownership && 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 "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .github/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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 fjrevoredo/mini-diarium --skill m01-ownership -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install fjrevoredo/mini-diarium m01-ownership --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/fjrevoredo/mini-diarium.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/m01-ownership .opencode/skills/m01-ownership && 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 "m01-ownership" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m01-ownership into .opencode/skills/m01-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m01-ownership", 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
m01-ownership- GitHub stars
- 309
- Used in
- 1 other repo
- Token cost
- ~1k tokens
- SKILL.md length
- 387 words
- Files
- 5
- Skills in repo
- 41
- Repo updated
- First seen
- Licence
- MIT
At a glance
CRITICAL: Use for ownership/borrow/lifetime issues. An agent skill from fjrevoredo/mini-diarium.
- Works in 3 steps: What is this data's domain role? → Is the ownership design intentional? → Fix symptom or redesign?
- Ownership/borrow/lifetime issues
- SKILL.md covers Core Question, Error → Design Question, Thinking Prompt and Trace Up ↑, plus 5 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
M01 Ownership is an agent skill from fjrevoredo/mini-diarium. CRITICAL: Use for ownership/borrow/lifetime issues. Triggers: E0382, E0597, E0506, E0507, E0515, E0716, E0106, value moved, borrowed value does not live long enough, cannot move out of, use of moved value, ownership, borrow, lifetime, 'a, 'static, move, clone, Copy, 所有权, 借用, 生命周期
Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files (for example `comparison.md`, `examples/best-practices.md` and `patterns/common-errors.md`).
The repository describes itself as: A local-only journal with serious encryption. Free, open source, and never touches the internet. The licence is MIT.
When your agent uses it
- Ownership/borrow/lifetime issues
Example prompts
- “/m01-ownership”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- What is this data's domain role?
- Is the ownership design intentional?
- Fix symptom or redesign?
What it can do on your machine
Read from SKILL.md and the folder at commit 4627248. 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
M01 Ownership loads about 1k tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 387 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 fjrevoredo/mini-diarium at commit 4627248, republished under its MIT licence (© fjrevoredo). 387 words, ~1,036 tokens.
Download SKILL.mdSave it as
.claude/skills/m01-ownership/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- m01-ownership
- description
- CRITICAL: Use for ownership/borrow/lifetime issues. Triggers: E0382, E0597, E0506, E0507, E0515, E0716, E0106, value moved, borrowed value does not live long enough, cannot move out of, use of moved value, ownership, borrow, lifetime, 'a, 'static, move, clone, Copy, 所有权, 借用, 生命周期
- user-invocable
- false
Ownership & Lifetimes
Layer 1: Language Mechanics
Core Question
Who should own this data, and for how long?
Before fixing ownership errors, understand the data's role:
- Is it shared or exclusive?
- Is it short-lived or long-lived?
- Is it transformed or just read?
Error → Design Question
| Error | Don't Just Say | Ask Instead |
|---|---|---|
| E0382 | "Clone it" | Who should own this data? |
| E0597 | "Extend lifetime" | Is the scope boundary correct? |
| E0506 | "End borrow first" | Should mutation happen elsewhere? |
| E0507 | "Clone before move" | Why are we moving from a reference? |
| E0515 | "Return owned" | Should caller own the data? |
| E0716 | "Bind to variable" | Why is this temporary? |
| E0106 | "Add 'a" | What is the actual lifetime relationship? |
Thinking Prompt
Before fixing an ownership error, ask:
What is this data's domain role?
- Entity (unique identity) → owned
- Value Object (interchangeable) → clone/copy OK
- Temporary (computation result) → maybe restructure
Is the ownership design intentional?
- By design → work within constraints
- Accidental → consider redesign
Fix symptom or redesign?
- If Strike 3 (3rd attempt) → escalate to Layer 2
Trace Up ↑
When errors persist, trace to design layer:
E0382 (moved value)
↑ Ask: What design choice led to this ownership pattern?
↑ Check: m09-domain (is this Entity or Value Object?)
↑ Check: domain-* (what constraints apply?)| Persistent Error | Trace To | Question |
|---|---|---|
| E0382 repeated | m02-resource | Should use Arc/Rc for sharing? |
| E0597 repeated | m09-domain | Is scope boundary at right place? |
| E0506/E0507 | m03-mutability | Should use interior mutability? |
Trace Down ↓
From design decisions to implementation:
"Data needs to be shared immutably"
↓ Use: Arc<T> (multi-thread) or Rc<T> (single-thread)
"Data needs exclusive ownership"
↓ Use: move semantics, take ownership
"Data is read-only view"
↓ Use: &T (immutable borrow)Show full SKILL.md (176 more words)Show less
Quick Reference
| Pattern | Ownership | Cost | Use When |
|---|---|---|---|
| Move | Transfer | Zero | Caller doesn't need data |
&T | Borrow | Zero | Read-only access |
&mut T | Exclusive borrow | Zero | Need to modify |
clone() | Duplicate | Alloc + copy | Actually need a copy |
Rc<T> | Shared (single) | Ref count | Single-thread sharing |
Arc<T> | Shared (multi) | Atomic ref count | Multi-thread sharing |
Cow<T> | Clone-on-write | Alloc if mutated | Might modify |
Error Code Reference
| Error | Cause | Quick Fix |
|---|---|---|
| E0382 | Value moved | Clone, reference, or redesign ownership |
| E0597 | Reference outlives owner | Extend owner scope or restructure |
| E0506 | Assign while borrowed | End borrow before mutation |
| E0507 | Move out of borrowed | Clone or use reference |
| E0515 | Return local reference | Return owned value |
| E0716 | Temporary dropped | Bind to variable |
| E0106 | Missing lifetime | Add 'a annotation |
Anti-Patterns
| Anti-Pattern | Why Bad | Better |
|---|---|---|
.clone() everywhere | Hides design issues | Design ownership properly |
| Fight borrow checker | Increases complexity | Work with the compiler |
'static for everything | Restricts flexibility | Use appropriate lifetimes |
Leak with Box::leak | Memory leak | Proper lifetime design |
Related Skills
| When | See |
|---|---|
| Need smart pointers | m02-resource |
| Need interior mutability | m03-mutability |
| Data is domain entity | m09-domain |
| Learning ownership concepts | m14-mental-model |
© fjrevoredo, 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 4 other files in .agents/skills/m01-ownership of fjrevoredo/mini-diarium.
- SKILL.md
- comparison.md
- examples/best-practices.md
- patterns/common-errors.md
- patterns/lifetime-patterns.md
Open the folder on GitHubat commit 4627248
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in fjrevoredo/mini-diarium, which our catalogue first saw on October 7, 2026.
Compare with similar skills
M01 Ownership 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 |
|---|---|---|---|---|---|---|
| M01 Ownership this skillfjrevoredo/mini-diarium | 309 | 1 repos | ~1k | Automated safety check: Pass | MIT | |
| Rust Ownership Borrowinghashgraph-online/awesome-codex-plugins | 1.3k | — | ~911 | Automated safety check: Pass | MIT | |
| Criticism Self CriticismHughYau/qiushi-skill | 3.8k | — | ~423 | Automated safety check: Pass | MIT | |
| Crossframe Criticalsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.3k | Automated safety check: Pass | MIT | |
| Critical Imagesthedaviddias/Front-End-Checklist | 74k | — | ~392 | Automated safety check: Pass | MIT | |
| CSS Criticalthedaviddias/Front-End-Checklist | 74k | — | ~441 | Automated safety check: Pass | MIT |
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Questions about M01 Ownership
What does M01 Ownership do?
CRITICAL: Use for ownership/borrow/lifetime issues. An agent skill from fjrevoredo/mini-diarium. M01 Ownership is an agent skill from fjrevoredo/mini-diarium. CRITICAL: Use for ownership/borrow/lifetime issues.
When should I use M01 Ownership?
M01 Ownership fits situations like: ownership/borrow/lifetime issues.
How do I install M01 Ownership in Claude Code?
Run `npx skills add fjrevoredo/mini-diarium --skill m01-ownership -a claude-code`. Or copy the skill folder (.agents/skills/m01-ownership in fjrevoredo/mini-diarium) into .claude/skills/m01-ownership in your project. Claude Code loads it when a task matches its description.
How do I install M01 Ownership in Codex?
Run `npx skills add fjrevoredo/mini-diarium --skill m01-ownership -a codex`. Or copy the skill folder (.agents/skills/m01-ownership in fjrevoredo/mini-diarium) into .agents/skills/m01-ownership in your project. Codex loads it when a task matches its description.
Can I use M01 Ownership 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 fjrevoredo/mini-diarium --skill m01-ownership -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/m01-ownership, .gemini/skills/m01-ownership, .github/skills/m01-ownership and .opencode/skills/m01-ownership in your project.
What does M01 Ownership need to run?
SKILL.md names no scripts, command-line tools or credentials: M01 Ownership is instructions for the agent only.
Does M01 Ownership 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 M01 Ownership 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 M01 Ownership use?
M01 Ownership 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 M01 Ownership use?
About 1k tokens (SKILL.md is roughly 4.1k 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 M01 Ownership?
Skills that share tags, products or a category with M01 Ownership: Rust Ownership Borrowing (hashgraph-online/awesome-codex-plugins, 1.3k stars), Criticism Self Criticism (HughYau/qiushi-skill, 3.8k stars), Crossframe Critical (sickn33/agentic-awesome-skills, 47k stars) and Critical Images (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains M01 Ownership?
fjrevoredo (a GitHub user) maintains it in fjrevoredo/mini-diarium, which has 309 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 9, 2026.
Source: fjrevoredo/mini-diarium on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.