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CRITICAL: Use for smart pointers and resource management. An agent skill from fjrevoredo/mini-diarium.
MITAuto-check passed
Install M02 Resource
$ npx skills add fjrevoredo/mini-diarium --skill m02-resource -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install fjrevoredo/mini-diarium m02-resource --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/m02-resource .claude/skills/m02-resource && 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 "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .claude/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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/m02-resourceType 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 m02-resource -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install fjrevoredo/mini-diarium m02-resource --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/m02-resource .agents/skills/m02-resource && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .agents/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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 m02-resource -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install fjrevoredo/mini-diarium m02-resource --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/m02-resource .cursor/skills/m02-resource && 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 "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .cursor/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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/m02-resource--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 m02-resource -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install fjrevoredo/mini-diarium m02-resource --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/m02-resource .gemini/skills/m02-resource && 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 "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .gemini/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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 m02-resourceInstalls 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 m02-resource -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/m02-resource .github/skills/m02-resource && 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 "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .github/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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 m02-resource -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 m02-resource --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/m02-resource .opencode/skills/m02-resource && 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 "m02-resource" agent skill from https://github.com/fjrevoredo/mini-diarium/tree/master/.agents/skills/m02-resource into .opencode/skills/m02-resource/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "m02-resource", 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
m02-resource- GitHub stars
- 308
- Used in
- 1 other repo
- Token cost
- ~1.1k tokens
- SKILL.md length
- 334 words
- Files
- 1
- Skills in repo
- 41
- Repo updated
- First seen
- Licence
- MIT
At a glance
CRITICAL: Use for smart pointers and resource management. An agent skill from fjrevoredo/mini-diarium.
- Works in 3 steps: What's the ownership model? → What's the thread context? → Are there cycles?
- Smart pointers and resource management
- SKILL.md covers Core Question, Error → Design Question, Thinking Prompt and Trace Up ↑, plus 6 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
M02 Resource is an agent skill from fjrevoredo/mini-diarium. CRITICAL: Use for smart pointers and resource management. Triggers: Box, Rc, Arc, Weak, RefCell, Cell, smart pointer, heap allocation, reference counting, RAII, Drop, should I use Box or Rc, when to use Arc vs Rc, 智能指针, 引用计数, 堆分配
Its SKILL.md is about 1.1k 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: A local-only journal with serious encryption. Free, open source, and never touches the internet. The licence is MIT.
When your agent uses it
- Smart pointers and resource management
Example prompts
- “/m02-resource”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- What's the ownership model?
- What's the thread context?
- Are there cycles?
What it can do on your machine
Read from SKILL.md and the folder at commit 75c1286. 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
M02 Resource loads about 1.1k tokens when it runs. Until then it costs about 61 tokens; SKILL.md has 334 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 75c1286, republished under its MIT licence (© fjrevoredo). 334 words, ~1,065 tokens.
Download SKILL.mdSave it as
.claude/skills/m02-resource/SKILL.md (or your agent's skills folder).- name
- m02-resource
- description
- CRITICAL: Use for smart pointers and resource management. Triggers: Box, Rc, Arc, Weak, RefCell, Cell, smart pointer, heap allocation, reference counting, RAII, Drop, should I use Box or Rc, when to use Arc vs Rc, 智能指针, 引用计数, 堆分配
- user-invocable
- false
Resource Management
Layer 1: Language Mechanics
Core Question
What ownership pattern does this resource need?
Before choosing a smart pointer, understand:
- Is ownership single or shared?
- Is access single-threaded or multi-threaded?
- Are there potential cycles?
Error → Design Question
| Error | Don't Just Say | Ask Instead |
|---|---|---|
| "Need heap allocation" | "Use Box" | Why can't this be on stack? |
| Rc memory leak | "Use Weak" | Is the cycle necessary in design? |
| RefCell panic | "Use try_borrow" | Is runtime check the right approach? |
| Arc overhead complaint | "Accept it" | Is multi-thread access actually needed? |
Thinking Prompt
Before choosing a smart pointer:
What's the ownership model?
- Single owner → Box or owned value
- Shared ownership → Rc/Arc
- Weak reference → Weak
What's the thread context?
- Single-thread → Rc, Cell, RefCell
- Multi-thread → Arc, Mutex, RwLock
Are there cycles?
- Yes → One direction must be Weak
- No → Regular Rc/Arc is fine
Trace Up ↑
When pointer choice is unclear, trace to design:
"Should I use Arc or Rc?"
↑ Ask: Is this data shared across threads?
↑ Check: m07-concurrency (thread model)
↑ Check: domain-* (performance constraints)| Situation | Trace To | Question |
|---|---|---|
| Rc vs Arc confusion | m07-concurrency | What's the concurrency model? |
| RefCell panics | m03-mutability | Is interior mutability right here? |
| Memory leaks | m12-lifecycle | Where should cleanup happen? |
Trace Down ↓
From design to implementation:
"Need single-owner heap data"
↓ Use: Box<T>
"Need shared immutable data (single-thread)"
↓ Use: Rc<T>
"Need shared immutable data (multi-thread)"
↓ Use: Arc<T>
"Need to break reference cycle"
↓ Use: Weak<T>
"Need shared mutable data"
↓ Single-thread: Rc<RefCell<T>>
↓ Multi-thread: Arc<Mutex<T>> or Arc<RwLock<T>>Quick Reference
| Type | Ownership | Thread-Safe | Use When |
|---|---|---|---|
Box<T> | Single | Yes | Heap allocation, recursive types |
Rc<T> | Shared | No | Single-thread shared ownership |
Arc<T> | Shared | Yes | Multi-thread shared ownership |
Weak<T> | Weak ref | Same as Rc/Arc | Break reference cycles |
Cell<T> | Single | No | Interior mutability (Copy types) |
RefCell<T> | Single | No | Interior mutability (runtime check) |
Decision Flowchart
Need heap allocation?
├─ Yes → Single owner?
│ ├─ Yes → Box<T>
│ └─ No → Multi-thread?
│ ├─ Yes → Arc<T>
│ └─ No → Rc<T>
└─ No → Stack allocation (default)
Have reference cycles?
├─ Yes → Use Weak for one direction
└─ No → Regular Rc/Arc
Need interior mutability?
├─ Yes → Thread-safe needed?
│ ├─ Yes → Mutex<T> or RwLock<T>
│ └─ No → T: Copy? → Cell<T> : RefCell<T>
└─ No → Use &mut TCommon Errors
| Problem | Cause | Fix |
|---|---|---|
| Rc cycle leak | Mutual strong refs | Use Weak for one direction |
| RefCell panic | Borrow conflict at runtime | Use try_borrow or restructure |
| Arc overhead | Atomic ops in hot path | Consider Rc if single-threaded |
| Box unnecessary | Data fits on stack | Remove Box |
Anti-Patterns
| Anti-Pattern | Why Bad | Better |
|---|---|---|
| Arc everywhere | Unnecessary atomic overhead | Use Rc for single-thread |
| RefCell everywhere | Runtime panics | Design clear ownership |
| Box for small types | Unnecessary allocation | Stack allocation |
| Ignore Weak for cycles | Memory leaks | Design parent-child with Weak |
Related Skills
| When | See |
|---|---|
| Ownership errors | m01-ownership |
| Interior mutability details | m03-mutability |
| Multi-thread context | m07-concurrency |
| Resource lifecycle | m12-lifecycle |
© 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
Just SKILL.md in .agents/skills/m02-resource of fjrevoredo/mini-diarium.
Open the folder on GitHubat commit 75c1286
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
M02 Resource 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 |
|---|---|---|---|---|---|---|
| M02 Resource this skillfjrevoredo/mini-diarium | 308 | 1 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Boxasgeirtj/system_prompts_leaks | 69k | — | ~1.1k | Automated safety check: Pass | CC0-1.0 | |
| No Pointerremotion-dev/remotion | 62k | — | ~532 | Automated safety check: Pass | Custom licence | |
| Criticism Self CriticismHughYau/qiushi-skill | 3.8k | — | ~423 | Automated safety check: Pass | MIT | |
| Smart Contract Formal Verificationsickn33/agentic-awesome-skills | 47k | 1 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Smart Contract Upgrade Governancesickn33/agentic-awesome-skills | 47k | 1 repos | ~1.4k | Automated safety check: Pass | MIT |
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Questions about M02 Resource
What does M02 Resource do?
CRITICAL: Use for smart pointers and resource management. An agent skill from fjrevoredo/mini-diarium. M02 Resource is an agent skill from fjrevoredo/mini-diarium. CRITICAL: Use for smart pointers and resource management.
When should I use M02 Resource?
M02 Resource fits situations like: smart pointers and resource management.
How do I install M02 Resource in Claude Code?
Run `npx skills add fjrevoredo/mini-diarium --skill m02-resource -a claude-code`. Or copy the skill folder (.agents/skills/m02-resource in fjrevoredo/mini-diarium) into .claude/skills/m02-resource in your project. Claude Code loads it when a task matches its description.
How do I install M02 Resource in Codex?
Run `npx skills add fjrevoredo/mini-diarium --skill m02-resource -a codex`. Or copy the skill folder (.agents/skills/m02-resource in fjrevoredo/mini-diarium) into .agents/skills/m02-resource in your project. Codex loads it when a task matches its description.
Can I use M02 Resource 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 m02-resource -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/m02-resource, .gemini/skills/m02-resource, .github/skills/m02-resource and .opencode/skills/m02-resource in your project.
What does M02 Resource need to run?
SKILL.md names no scripts, command-line tools or credentials: M02 Resource is instructions for the agent only.
Does M02 Resource 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 M02 Resource 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 M02 Resource use?
M02 Resource 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 M02 Resource use?
About 1.1k tokens (SKILL.md is roughly 4.3k 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 M02 Resource?
Skills that share tags, products or a category with M02 Resource: Box (asgeirtj/system_prompts_leaks, 69k stars), No Pointer (remotion-dev/remotion, 62k stars), Criticism Self Criticism (HughYau/qiushi-skill, 3.8k stars) and Smart Contract Formal Verification (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains M02 Resource?
fjrevoredo (a GitHub user) maintains it in fjrevoredo/mini-diarium, which has 308 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 4, 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.