Update V8 Version
openinterpreter/openinterpreter
Bumps the pinned v8 and rusty_v8 versions in Codex, validates the release-candidate path with the v8-canary check, and traces failures to upstream build changes.
Detects duplicated Rust code with the dev-shell similarity-rs CLI.
Custom licenceAuto-check passed
Install Reduce Similarities
$ npx skills add ccusage/ccusage --skill reduce-similarities -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ccusage/ccusage reduce-similarities --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/ccusage/ccusage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/reduce-similarities .claude/skills/reduce-similarities && 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 "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .claude/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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/ccusage/ccusage/tree/main/.agents/skills/reduce-similaritiesType 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 ccusage/ccusage --skill reduce-similarities -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ccusage/ccusage reduce-similarities --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/reduce-similarities .agents/skills/reduce-similarities && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .agents/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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 ccusage/ccusage --skill reduce-similarities -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ccusage/ccusage reduce-similarities --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/reduce-similarities .cursor/skills/reduce-similarities && 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 "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .cursor/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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/ccusage/ccusage.git --path .agents/skills/reduce-similarities--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 ccusage/ccusage --skill reduce-similarities -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ccusage/ccusage reduce-similarities --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/reduce-similarities .gemini/skills/reduce-similarities && 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 "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .gemini/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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 ccusage/ccusage reduce-similaritiesInstalls 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 ccusage/ccusage --skill reduce-similarities -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/reduce-similarities .github/skills/reduce-similarities && 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 "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .github/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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 ccusage/ccusage --skill reduce-similarities -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ccusage/ccusage reduce-similarities --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccusage/ccusage.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/reduce-similarities .opencode/skills/reduce-similarities && 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 "reduce-similarities" agent skill from https://github.com/ccusage/ccusage/tree/main/.agents/skills/reduce-similarities into .opencode/skills/reduce-similarities/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reduce-similarities", 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
reduce-similarities- GitHub stars
- 19k
- Token cost
- ~431 tokens
- SKILL.md length
- 173 words
- Files
- 1
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Detects duplicated Rust code with the dev-shell similarity-rs CLI.
- Reviewing .rs files for repeated functions
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Parallel struct and enum definitions
- Before extracting a shared helper
What it does
Reduce Similarities is an agent skill from ccusage/ccusage. Detects duplicated Rust code with the dev-shell similarity-rs CLI. Use when reviewing .rs files for repeated functions, impl methods, or parallel struct and enum definitions, or before extracting a shared helper.
Its SKILL.md is about 430 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Rust.
When your agent uses it
- Reviewing .rs files for repeated functions
- Parallel struct and enum definitions
- Before extracting a shared helper
Example prompts
- “Use the reduce-similarities skill to detect duplicated Rust code with the dev-shell similarity-rs CLI”
- “/reduce-similarities”
Requirements
- Pre-approved tools (allowed-tools): Bash(similarity-rs *), Read, Grep, Glob
What it can do on your machine
Read from SKILL.md and the folder at commit 5ca8d8e. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Bash(similarity-rs *)ReadGrepGlob
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 bash).
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
Reduce Similarities loads about 431 tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 173 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 173 words (~431 tokens).
“similarity-rs comes from the Nix dev shell (similarity in nix/dev-shell.nix); prefix it with direnv exec . from outside the shell. TypeScript duplication belongs to the typescript and ast-grep skills.”
- name
- reduce-similarities
- allowed-tools
- Bash(similarity-rs *), Read, Grep, Glob
- argument-hint
- [path] [--threshold 0.85] [--print]
- paths
- **/*.rs
Files
Just SKILL.md in .agents/skills/reduce-similarities of ccusage/ccusage.
Open the folder on GitHubat commit 5ca8d8e
Compare with similar skills
Reduce Similarities 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 |
|---|---|---|---|---|---|---|
| Reduce Similarities this skillccusage/ccusage | 19k | — | ~431 | Automated safety check: Pass | Custom licence | |
| Update V8 Versionopeninterpreter/openinterpreter | 69k | 2 repos | ~845 | Automated safety check: Pass | Apache-2.0 | |
| Firecrawl Page Scrape Integrationfirecrawl/firecrawl | 190k | 1 repos | ~944 | Automated safety check: Pass | ISC | |
| Migrate Core Code to Submodulestinyhumansai/openhuman | 42k | — | ~2.6k | Automated safety check: Pass | GPL-3.0 | |
| Rust TDD Workflowrtk-ai/rtk | 83k | — | ~753 | Automated safety check: Notes | Apache-2.0 | |
| Rust Best Practicesfarm-fe/farm | 5.6k | 3 repos | ~1.1k | Automated safety check: Pass | MIT |
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Migrate Core Code to Submodules
tinyhumansai/openhuman
Plans and carries out moving non-host-specific code and its tests from the OpenHuman core into vendored tiny submodule libraries, then releases the submodule and re-pins the host.
Rust TDD Workflow
rtk-ai/rtk
Enforces red-green-refactor for Rust work, with idiomatic test patterns, a naming convention and a pre-commit gate of cargo fmt, clippy and test.
Rust Best Practices
farm-fe/farm
Guide for writing idiomatic Rust code based on Apollo GraphQL's best practices handbook.
OpenLogi macOS Permissions Triage
AprilNEA/OpenLogi
Decides whether an OpenLogi device problem on macOS is a privacy-permission (TCC) problem, using agent log lines, and says which identity needs which grant.
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Related
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Questions about Reduce Similarities
What does Reduce Similarities do?
Detects duplicated Rust code with the dev-shell similarity-rs CLI. Reduce Similarities is an agent skill from ccusage/ccusage. Detects duplicated Rust code with the dev-shell similarity-rs CLI.
When should I use Reduce Similarities?
Reduce Similarities fits situations like: reviewing .rs files for repeated functions; parallel struct and enum definitions; before extracting a shared helper.
How do I install Reduce Similarities in Claude Code?
Run `npx skills add ccusage/ccusage --skill reduce-similarities -a claude-code`. Or copy the skill folder (.agents/skills/reduce-similarities in ccusage/ccusage) into .claude/skills/reduce-similarities in your project. Claude Code loads it when a task matches its description.
How do I install Reduce Similarities in Codex?
Run `npx skills add ccusage/ccusage --skill reduce-similarities -a codex`. Or copy the skill folder (.agents/skills/reduce-similarities in ccusage/ccusage) into .agents/skills/reduce-similarities in your project. Codex loads it when a task matches its description.
Can I use Reduce Similarities 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 ccusage/ccusage --skill reduce-similarities -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/reduce-similarities, .gemini/skills/reduce-similarities, .github/skills/reduce-similarities and .opencode/skills/reduce-similarities in your project.
What does Reduce Similarities need to run?
SKILL.md names no scripts, command-line tools or credentials: Reduce Similarities is instructions for the agent only. Its frontmatter pre-approves these tools: Bash(similarity-rs *), Read, Grep, Glob.
Does Reduce Similarities 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 Reduce Similarities 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 Reduce Similarities use?
Reduce Similarities 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 Reduce Similarities use?
About 431 tokens (SKILL.md is roughly 1.7k 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 Reduce Similarities?
Skills that share tags, products or a category with Reduce Similarities: Update V8 Version (openinterpreter/openinterpreter, 69k stars), Firecrawl Page Scrape Integration (firecrawl/firecrawl, 190k stars), Migrate Core Code to Submodules (tinyhumansai/openhuman, 42k stars) and Rust TDD Workflow (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 Reduce Similarities?
ccusage (a GitHub organization) maintains it in ccusage/ccusage, which has 18,912 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 8, 2026.
Source: ccusage/ccusage on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.