Finishing a Development Branch
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
A skill your agent uses when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and…
Install Go Data Structures
$ npx skills add cxuu/golang-skills --skill go-data-structures -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cxuu/golang-skills go-data-structures --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/cxuu/golang-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/go-data-structures .claude/skills/go-data-structures && 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 "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .claude/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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/cxuu/golang-skills/tree/main/skills/go-data-structuresType 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 cxuu/golang-skills --skill go-data-structures -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cxuu/golang-skills go-data-structures --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cxuu/golang-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/go-data-structures .agents/skills/go-data-structures && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .agents/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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 cxuu/golang-skills --skill go-data-structures -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cxuu/golang-skills go-data-structures --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cxuu/golang-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/go-data-structures .cursor/skills/go-data-structures && 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 "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .cursor/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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/cxuu/golang-skills.git --path skills/go-data-structures--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 cxuu/golang-skills --skill go-data-structures -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cxuu/golang-skills go-data-structures --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cxuu/golang-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/go-data-structures .gemini/skills/go-data-structures && 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 "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .gemini/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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 cxuu/golang-skills go-data-structuresInstalls 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 cxuu/golang-skills --skill go-data-structures -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cxuu/golang-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/go-data-structures .github/skills/go-data-structures && 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 "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .github/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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 cxuu/golang-skills --skill go-data-structures -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cxuu/golang-skills go-data-structures --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cxuu/golang-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/go-data-structures .opencode/skills/go-data-structures && 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 "go-data-structures" agent skill from https://github.com/cxuu/golang-skills/tree/main/skills/go-data-structures into .opencode/skills/go-data-structures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "go-data-structures", 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
go-data-structures- GitHub stars
- 170
- Token cost
- ~1.1k tokens
- SKILL.md length
- 322 words
- Files
- 2 (incl. references)
- Skills in repo
- 20
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
A skill your agent uses when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and…
- Working with Go slices
- SKILL.md covers Resource Routing, Choosing a Data Structure, Slices and Maps, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Arrays — choosing between new and make
What it does
Go Data Structures is an agent skill from cxuu/golang-skills. Use when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and copying data at boundaries. Also use when building or manipulating collections, even if the user doesn't ask about allocation idioms. Does not cover concurrent data structure safety (see go-concurrency).
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/SLICES.md`).
It sits in Development. The repository describes itself as: AI Agent Skills for idiomatic, production-ready Go code, distilled from Google, Uber, Community. The licence is Apache-2.0.
When your agent uses it
- Working with Go slices
- Arrays — choosing between new and make
- Declaring empty slices (nil vs literal for JSON)
- Implementing sets with maps
Example prompts
- “/go-data-structures”
What it can do on your machine
Read from SKILL.md and the folder at commit 91f0c2e. 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 (its code samples are go).
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
Go Data Structures loads about 1.1k tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 100 tokens; SKILL.md has 322 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 cxuu/golang-skills at commit 91f0c2e, republished under its Apache-2.0 licence (© cxuu). 322 words, ~1,094 tokens.
Download SKILL.mdSave it as
.claude/skills/go-data-structures/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- go-data-structures
- description
- Use when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and copying data at boundaries. Also use when building or manipulating collections, even if the user doesn't ask about allocation idioms. Does not cover concurrent data structure safety (see go-concurrency).
Go Data Structures
Resource Routing
references/SLICES.md- Read when deciding nil versus empty slices, copying slices, or managing slice capacity and aliasing.
Choosing a Data Structure
What do you need?
├─ Ordered collection of items
│ ├─ Fixed size known at compile time → Array [N]T
│ └─ Dynamic size → Slice []T
│ ├─ Know approximate size? → make([]T, 0, capacity)
│ └─ Unknown size or nil-safe for JSON? → var s []T (nil)
├─ Key-value lookup
│ └─ Map map[K]V
│ ├─ Know approximate size? → make(map[K]V, capacity)
│ └─ Need a set? → map[T]struct{} (zero-size values)
└─ Need to pass to a function?
└─ Copy at the boundary if the caller might mutate itWhen this skill does NOT apply: For concurrent access to data structures (mutexes, atomic operations), see go-concurrency. For defensive copying at API boundaries, see go-defensive. For pre-sizing capacity for performance, see go-performance.
Slices
The append Function
Always assign the result — the underlying array may change:
x := []int{1, 2, 3}
x = append(x, 4, 5, 6)
// Append a slice to a slice
x = append(x, y...) // Note the ...Two-Dimensional Slices
Independent inner slices (can grow/shrink independently):
picture := make([][]uint8, YSize)
for i := range picture {
picture[i] = make([]uint8, XSize)
}Single allocation (more efficient for fixed sizes):
picture := make([][]uint8, YSize)
pixels := make([]uint8, XSize*YSize)
for i := range picture {
picture[i], pixels = pixels[:XSize], pixels[XSize:]
}Declaring Empty Slices
Prefer nil slices over empty literals:
// Good: nil slice
var t []string
// Avoid: non-nil but zero-length
t := []string{}Both have len and cap of zero, but the nil slice is the preferred style.
Exception for JSON: A nil slice encodes to null, while []string{}
encodes to []. Use non-nil when you need a JSON array.
When designing interfaces, avoid distinguishing between nil and non-nil zero-length slices.
Maps
Implementing a Set
Use map[T]struct{} when the map is only a set. The empty struct takes no
storage and makes membership intent explicit:
attended := map[string]struct{}{"Ann": {}, "Joe": {}}
if _, ok := attended[person]; ok {
fmt.Println(person, "was at the meeting")
}Use boolean map values only when the value carries a separate meaning beyond presence.
Copying
Be careful when copying a struct from another package. If the type has methods
on its pointer type (*T), copying the value can cause aliasing bugs.
General rule: Do not copy a value of type T if its methods are associated
with the pointer type *T. This applies to bytes.Buffer, sync.Mutex,
sync.WaitGroup, and types containing them.
// Bad: copying a mutex
var mu sync.Mutex
mu2 := mu // almost always a bug
// Good: pass by pointer
func increment(sc *SafeCounter) {
sc.mu.Lock()
sc.count++
sc.mu.Unlock()
}Quick Reference
| Topic | Key Point |
|---|---|
| Slices | Always assign append result; nil slice preferred over []T{} |
| Sets | map[T]struct{} for membership-only sets |
| Copying | Don't copy T if methods are on *T; beware aliasing |
Related Skills
- Defensive copying: See go-defensive when copying slices or maps at API boundaries to prevent mutation
- Capacity hints: See go-performance when pre-sizing slices or maps for known workloads
- Iteration patterns: See go-control-flow when using range loops over slices, maps, or channels
- Declaration style: See go-declarations when choosing between
new,make,var, and composite literals
© cxuu, Apache-2.0. 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 (references) in skills/go-data-structures of cxuu/golang-skills.
- SKILL.md
- references/SLICES.md
Open the folder on GitHubat commit 91f0c2e
Compare with similar skills
Go Data Structures 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 |
|---|---|---|---|---|---|---|
| Go Data Structures this skillcxuu/golang-skills | 170 | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Finishing a Development Branchobra/superpowers | 296k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 24 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Greplooponyx-dot-app/onyx | 32k | 4 repos | ~3.3k | Automated safety check: Pass | MIT |
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Code Review Checklist
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Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
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Related
Categories
Questions about Go Data Structures
What does Go Data Structures do?
A skill your agent uses when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and…. Go Data Structures is an agent skill from cxuu/golang-skills. Use when working with Go slices, maps, or arrays — choosing between new and make, using append, declaring empty slices (nil vs literal for JSON), implementing sets with maps, and copying data at boundaries.
When should I use Go Data Structures?
Go Data Structures fits situations like: working with Go slices; arrays — choosing between new and make; declaring empty slices (nil vs literal for JSON); implementing sets with maps.
How do I install Go Data Structures in Claude Code?
Run `npx skills add cxuu/golang-skills --skill go-data-structures -a claude-code`. Or copy the skill folder (skills/go-data-structures in cxuu/golang-skills) into .claude/skills/go-data-structures in your project. Claude Code loads it when a task matches its description.
How do I install Go Data Structures in Codex?
Run `npx skills add cxuu/golang-skills --skill go-data-structures -a codex`. Or copy the skill folder (skills/go-data-structures in cxuu/golang-skills) into .agents/skills/go-data-structures in your project. Codex loads it when a task matches its description.
Can I use Go Data Structures 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 cxuu/golang-skills --skill go-data-structures -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/go-data-structures, .gemini/skills/go-data-structures, .github/skills/go-data-structures and .opencode/skills/go-data-structures in your project.
What does Go Data Structures need to run?
SKILL.md names no scripts, command-line tools or credentials: Go Data Structures is instructions for the agent only.
Does Go Data Structures 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 Go Data Structures 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 Go Data Structures use?
Go Data Structures is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Go Data Structures use?
About 1.1k tokens (SKILL.md is roughly 4.4k 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 832 tokens, read only when the agent opens those files.
What are the alternatives to Go Data Structures?
Skills that share tags, products or a category with Go Data Structures: Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars), PR Babysitter (openinterpreter/openinterpreter, 69k stars) and Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Go Data Structures?
cxuu (a GitHub user) maintains it in cxuu/golang-skills, which has 170 GitHub stars. The repository holds 20 skills in this directory. The repository was last updated on June 20, 2026.
Source: cxuu/golang-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.