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Agent skill

Rust Iterator Collections

by hashgraph-online in hashgraph-online/awesome-codex-plugins

Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior.

MITAuto-check passedDevelopment

Install Rust Iterator Collections

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill rust-iterator-collections -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins rust-iterator-collections --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/LVTD-LLC/skills/skills/rust-iterator-collections .claude/skills/rust-iterator-collections && rm -rf skills-src

Use ~/.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/

Facts

Skill name
rust-iterator-collections
GitHub stars
1.2k
Token cost
~826 tokens
SKILL.md length
348 words
Files
3 (incl. references)
Skills in repo
686
Repo updated
First seen
Licence
MIT

At a glance

Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior.

  • Works in 7 steps: Identify the input ownership mode:… → Pick the simplest iterator shape: iter,… → Replace manual loops with adapters only… → …
  • Reviewing iterators
  • SKILL.md covers Core Workflow, Iterator Rules, Collection Rules and Review Checklist
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Rust Iterator Collections is an agent skill from hashgraph-online/awesome-codex-plugins. Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior. Use when writing, refactoring, or reviewing iterators, HashMap Entry usage, collect, FromIterator, Extend, custom iterators, or allocation-heavy loops.

Its SKILL.md is about 830 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `agents/openai.yaml` and `references/iterator-collection-patterns.md`). Compatibility notes: Codex, Claude Code, and other Agent Skills-compatible clients.

It sits in Development, covering Refactoring. It works with Rust. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is MIT.

When your agent uses it

  • Reviewing iterators
  • HashMap Entry usage
  • Custom iterators
  • Allocation-heavy loops

Example prompts

  • “/rust-iterator-collections”

Requirements

  • Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients.

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Identify the input ownership mode: borrowed iteration, mutable iteration, or
  2. Pick the simplest iterator shape: iter, iter_mut, into_iter, ranges,
  3. Replace manual loops with adapters only when the resulting code is clearer.
  4. Use fallible iterator consumers such as collect::, _>>(),
  5. Use HashMap::entry or BTreeMap::entry for insert-or-update logic.
  6. Avoid unnecessary intermediate Vecs. Chain iterators or extend an existing
  7. Test empty input, single item input, duplicate keys, ordering expectations,

What it can do on your machine

Read from SKILL.md and the folder at commit 78497e5. 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.

  • Compatibility

    Codex, Claude Code, and other Agent Skills-compatible clients.

    From compatibility in the SKILL.md frontmatter.

Context cost

Rust Iterator Collections loads about 826 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 76 tokens; SKILL.md has 348 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~76
When it runs · the whole SKILL.md, loaded when a task matches
~826
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.3k

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 hashgraph-online/awesome-codex-plugins at commit 78497e5, republished under its MIT licence (© hashgraph-online). 348 words, ~826 tokens.

Download SKILL.mdSave it as .claude/skills/rust-iterator-collections/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
rust-iterator-collections
description
Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior. Use when writing, refactoring, or reviewing iterators, HashMap Entry usage, collect, FromIterator, Extend, custom iterators, or allocation-heavy loops.
compatibility
Codex, Claude Code, and other Agent Skills-compatible clients.
license
MIT
metadata.version
0.1.0
metadata.displayName
Rust Iterator Collections
metadata.category
Rust
metadata.tags
rust,iterators,collections,hashmap,performance

Rust Iterator Collections

Use this skill to turn collection code into clear, idiomatic Rust. Prefer iterator and collection APIs that express the operation directly while keeping ownership, allocation, and error behavior visible.

Core Workflow

  1. Identify the input ownership mode: borrowed iteration, mutable iteration, or consuming iteration.
  2. Pick the simplest iterator shape: iter, iter_mut, into_iter, ranges, drain, or a collection-specific method.
  3. Replace manual loops with adapters only when the resulting code is clearer. Keep explicit loops for complex branching, early mutation, or debugging.
  4. Use fallible iterator consumers such as collect::<Result<Vec<_>, _>>(), try_fold, and try_for_each when errors should short-circuit.
  5. Use HashMap::entry or BTreeMap::entry for insert-or-update logic.
  6. Avoid unnecessary intermediate Vecs. Chain iterators or extend an existing collection when possible.
  7. Test empty input, single item input, duplicate keys, ordering expectations, and error short-circuiting.

Iterator Rules

  • Accept impl IntoIterator<Item = T> when the function only needs iteration.
  • Use &[T] when slice semantics are enough; avoid &Vec<T>.
  • Use filter_map for map-then-discard-None; use flat_map when each item expands to zero or more items.
  • Use map_while or scan for stateful transformations when they make stopping behavior explicit.
  • Add type annotations at collect boundaries, not throughout the pipeline.
  • Prefer cloned or copied over map(|x| x.clone()) when cloning iterator items is intentional.

Collection Rules

Read references/iterator-collection-patterns.md when refactoring a loop or reviewing collection mutation.

  • Use Vec for contiguous ordered data, VecDeque for queue-like push/pop at both ends, BinaryHeap for priority queues, HashMap for unordered lookup, and BTreeMap for sorted lookup or range queries.
  • Use retain, drain, splice, and split_off instead of mutating a collection while separately iterating over borrowed elements.
  • Use Entry::or_insert_with when default construction is expensive.
  • Preserve ordering deliberately. Do not swap BTreeMap for HashMap when iteration order is part of behavior.
  • Reserve capacity only when size is known or profiling shows reallocation matters.

Review Checklist

  • The pipeline communicates ownership and error behavior clearly.
  • No contains_key followed by insert where entry would be simpler.
  • No avoidable collect::<Vec<_>>() just to iterate again.
  • Indexing is used only when indices are the domain concept.
  • Tests cover duplicates, empty input, and deterministic ordering where needed.

© hashgraph-online, 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 2 other files (references) in plugins/LVTD-LLC/skills/skills/rust-iterator-collections of hashgraph-online/awesome-codex-plugins.

  • SKILL.md
  • agents/openai.yaml
  • references/iterator-collection-patterns.md

Open the folder on GitHubat commit 78497e5

Compare with similar skills

Rust Iterator Collections 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.

Rust Iterator Collections compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Rust Iterator Collections this skillhashgraph-online/awesome-codex-plugins1.2k—~826Automated safety check: PassMIT
Migrate Core Code to Submodulestinyhumansai/openhuman42k—~2.6kAutomated safety check: PassGPL-3.0
Rust Best Practicesfarm-fe/farm5.6k3 repos~1.1kAutomated safety check: PassMIT
RTK Rust Design Patternsrtk-ai/rtk83k—~1.9kAutomated safety check: PassApache-2.0
RTK Rust Code Simplifierrtk-ai/rtk83k—~1.1kAutomated safety check: PassApache-2.0
Rust Hygiene Audittsz-org/tsz577—~1.5kAutomated safety check: PassApache-2.0

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Works with

Categories

Questions about Rust Iterator Collections

What does Rust Iterator Collections do?

Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior. Rust Iterator Collections is an agent skill from hashgraph-online/awesome-codex-plugins. Design and review Rust iterator pipelines and collection code for clear ownership, allocation, ordering, and error behavior.

When should I use Rust Iterator Collections?

Rust Iterator Collections fits situations like: reviewing iterators; hashMap Entry usage; custom iterators; allocation-heavy loops.

How do I install Rust Iterator Collections in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill rust-iterator-collections -a claude-code`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/rust-iterator-collections in hashgraph-online/awesome-codex-plugins) into .claude/skills/rust-iterator-collections in your project. Claude Code loads it when a task matches its description.

How do I install Rust Iterator Collections in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill rust-iterator-collections -a codex`. Or copy the skill folder (plugins/LVTD-LLC/skills/skills/rust-iterator-collections in hashgraph-online/awesome-codex-plugins) into .agents/skills/rust-iterator-collections in your project. Codex loads it when a task matches its description.

Can I use Rust Iterator Collections 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 hashgraph-online/awesome-codex-plugins --skill rust-iterator-collections -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rust-iterator-collections, .gemini/skills/rust-iterator-collections, .github/skills/rust-iterator-collections and .opencode/skills/rust-iterator-collections in your project.

What does Rust Iterator Collections need to run?

SKILL.md names no scripts, command-line tools or credentials: Rust Iterator Collections is instructions for the agent only. Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients..

Does Rust Iterator Collections 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 Rust Iterator Collections 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 Rust Iterator Collections use?

Rust Iterator Collections is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Rust Iterator Collections use?

About 826 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 445 tokens, read only when the agent opens those files.

What are the alternatives to Rust Iterator Collections?

Skills that share tags, products or a category with Rust Iterator Collections: Migrate Core Code to Submodules (tinyhumansai/openhuman, 42k stars), Rust Best Practices (farm-fe/farm, 5.6k stars), RTK Rust Design Patterns (rtk-ai/rtk, 83k stars) and RTK Rust Code Simplifier (rtk-ai/rtk, 83k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Rust Iterator Collections?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,242 GitHub stars. The repository holds 686 skills in this directory. The repository was last updated on October 8, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.