Swig CI Repro
swig/swig
Reproduce a GitHub Actions Linux CI failure locally when it does not happen on your machine: a podman/docker image that mirrors the ubuntu-22.04 runner by reusing the real Tools/CI-linux-.sh install…
A skill your agent uses when writing, reviewing, or modifying RBS type signatures (sig//.rbs, vendor/rbs//.rbs, or inline : annotations) or running Steep – e.g.
Install Write Rbs
$ npx skills add DataDog/dd-trace-rb --skill write-rbs -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install DataDog/dd-trace-rb write-rbs --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/DataDog/dd-trace-rb.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/write-rbs .claude/skills/write-rbs && 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 "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .claude/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbsType 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 DataDog/dd-trace-rb --skill write-rbs -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install DataDog/dd-trace-rb write-rbs --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/dd-trace-rb.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/write-rbs .agents/skills/write-rbs && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .agents/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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 DataDog/dd-trace-rb --skill write-rbs -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install DataDog/dd-trace-rb write-rbs --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/dd-trace-rb.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/write-rbs .cursor/skills/write-rbs && 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 "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .cursor/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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/DataDog/dd-trace-rb.git --path .agents/skills/write-rbs--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 DataDog/dd-trace-rb --skill write-rbs -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install DataDog/dd-trace-rb write-rbs --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/dd-trace-rb.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/write-rbs .gemini/skills/write-rbs && 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 "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .gemini/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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 DataDog/dd-trace-rb write-rbsInstalls 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 DataDog/dd-trace-rb --skill write-rbs -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/DataDog/dd-trace-rb.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/write-rbs .github/skills/write-rbs && 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 "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .github/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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 DataDog/dd-trace-rb --skill write-rbs -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install DataDog/dd-trace-rb write-rbs --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/dd-trace-rb.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/write-rbs .opencode/skills/write-rbs && 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 "write-rbs" agent skill from https://github.com/DataDog/dd-trace-rb/tree/master/.agents/skills/write-rbs into .opencode/skills/write-rbs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "write-rbs", 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
write-rbs- GitHub stars
- 417
- Token cost
- ~805 tokens
- SKILL.md length
- 400 words
- Files
- 9 (incl. references)
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
A skill your agent uses when writing, reviewing, or modifying RBS type signatures (sig//.rbs, vendor/rbs//.rbs, or inline : annotations) or running Steep – e.g.
- Modifying RBS type signatures (sig//.rbs
- SKILL.md covers Core rules, Vendored signatures, Advanced techniques and Signature generation, plus 1 more section
- Calls bundle
- Vendor/rbs//.rbs
What it does
Write Rbs is an agent skill from DataDog/dd-trace-rb, published by the product's own GitHub organization. Use when writing, reviewing, or modifying RBS type signatures (sig//.rbs, vendor/rbs//.rbs, or inline : annotations) or running Steep – e.g. "write rbs", "add type signatures", "type this class", "run steep", "check types". Enforces dd-trace-rb RBS conventions.
Its SKILL.md is about 810 tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files, including reference files (for example `README.md`, `references/class-definitions.md` and `references/generics.md`).
It sits in DevOps & Cloud. It works with Datadog and Ruby. The repository describes itself as: Datadog's client library for Ruby.
When your agent uses it
- Modifying RBS type signatures (sig//.rbs
- Vendor/rbs//.rbs
- Inline : annotations)
- Running Steep – e.g
Example prompts
- “write rbs”
- “add type signatures”
- “type this class”
- “/write-rbs”
What it can do on your machine
Read from SKILL.md and the folder at commit 8a3b01c. 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
Shell commands in SKILL.md call:
bundle
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
Write Rbs loads about 805 tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 70 tokens; SKILL.md has 400 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 400 words (~805 tokens).
“Signatures live in sig/, mirroring lib/ one .rbs per .rb. Vendored gem stubs live in vendor/rbs/. ALWAYS check for an existing .rbs before writing a new one”
- name
- write-rbs
Files
SKILL.md and 8 other files (references) in .agents/skills/write-rbs of DataDog/dd-trace-rb.
- SKILL.md
- README.md
- references/class-definitions.md
- references/generics.md
- references/inline-rbs.md
- references/interfaces.md
- references/procs.md
- references/steep-annotations.md
- references/type-aliases.md
Open the folder on GitHubat commit 8a3b01c
Compare with similar skills
Write Rbs 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 |
|---|---|---|---|---|---|---|
| Write Rbs this skillDataDog/dd-trace-rb | 417 | — | ~805 | Automated safety check: Pass | Custom licence | |
| Swig CI Reproswig/swig | 6.3k | — | ~1.2k | Automated safety check: Pass | Custom licence | |
| Apm IntegrationsDataDog/dd-trace-js | 836 | — | ~3k | Automated safety check: Pass | Custom licence | |
| Dd IdpDataDog/pup | 1k | — | ~2k | Automated safety check: Pass | Apache-2.0 | |
| Datadog Data Source GeneratorDataDog/terraform-provider-datadog | 468 | — | ~2.7k | Automated safety check: Pass | MPL-2.0 | |
| Apm IntegrationsDataDog/dd-trace-java | 736 | — | ~3.7k | Automated safety check: Notes | Apache-2.0 |
Similar skills
- Official
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DataDog/dd-trace-js
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Dd Idp
DataDog/pup
Find, filter, count, and connect software, teams, engineering work and delivery, infrastructure, and operational or security records through Pup's read-only Datadog entity graph.
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Generates a Datadog Terraform provider data source from an OpenAPI operation with tfgen and opens a review-ready GitHub PR with a risk scan and testing guide.
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Write a new library instrumentation end-to-end. An agent skill from DataDog/dd-trace-java.
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Diagnoses and fixes failing GitHub Actions runs by identifying the failure, fetching only the relevant logs, finding the root cause and reproducing it locally.
More from DataDog/dd-trace-rb
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Write Changelog
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A skill your agent uses when a change in this repo needs a customer-facing changelog entry — e.g.
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A skill your agent uses whenever writing or reviewing a code comment anywhere in this repo (lib, ext, spec, sig, docs, CI config, etc.) – e.g.
Related
Categories
Questions about Write Rbs
What does Write Rbs do?
A skill your agent uses when writing, reviewing, or modifying RBS type signatures (sig//.rbs, vendor/rbs//.rbs, or inline : annotations) or running Steep – e.g. Write Rbs is an agent skill from DataDog/dd-trace-rb, published by the product's own GitHub organization.g.
When should I use Write Rbs?
Write Rbs fits situations like: modifying RBS type signatures (sig//.rbs; vendor/rbs//.rbs; inline : annotations); running Steep – e.g.
How do I install Write Rbs in Claude Code?
Run `npx skills add DataDog/dd-trace-rb --skill write-rbs -a claude-code`. Or copy the skill folder (.agents/skills/write-rbs in DataDog/dd-trace-rb) into .claude/skills/write-rbs in your project. Claude Code loads it when a task matches its description.
How do I install Write Rbs in Codex?
Run `npx skills add DataDog/dd-trace-rb --skill write-rbs -a codex`. Or copy the skill folder (.agents/skills/write-rbs in DataDog/dd-trace-rb) into .agents/skills/write-rbs in your project. Codex loads it when a task matches its description.
Can I use Write Rbs 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 DataDog/dd-trace-rb --skill write-rbs -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/write-rbs, .gemini/skills/write-rbs, .github/skills/write-rbs and .opencode/skills/write-rbs in your project.
What does Write Rbs need to run?
Going by SKILL.md and its folder, Write Rbs needs the command-line tools its instructions call (bundle).
Does Write Rbs 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 Write Rbs 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 Write Rbs use?
Write Rbs 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 Write Rbs use?
About 805 tokens (SKILL.md is roughly 3.2k 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 3.1k tokens, read only when the agent opens those files.
What are the alternatives to Write Rbs?
Skills that share tags, products or a category with Write Rbs: Swig CI Repro (swig/swig, 6.3k stars), Apm Integrations (DataDog/dd-trace-js, 836 stars), Dd Idp (DataDog/pup, 1k stars) and Datadog Data Source Generator (DataDog/terraform-provider-datadog, 468 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Write Rbs?
DataDog (a GitHub organization, an official publisher) maintains it in DataDog/dd-trace-rb, which has 417 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on October 7, 2026.
Source: DataDog/dd-trace-rb on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.