Java SDK E2E Test with Replay Snapshot
github/copilot-sdk
Creates a Java SDK end-to-end test for the Copilot SDK that runs against a recorded YAML snapshot through a replay proxy, so CI needs no real authentication.
Add integration tests to TestGCMetrics.java for new GC collector support added to new-gc-default-jmx-metrics.yaml.
Install Add Gc Test
$ npx skills add DataDog/jmxfetch --skill add-gc-test -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install DataDog/jmxfetch add-gc-test --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/jmxfetch.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/add-gc-test .claude/skills/add-gc-test && 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 "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .claude/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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/jmxfetch/tree/master/.claude/skills/add-gc-testType 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/jmxfetch --skill add-gc-test -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install DataDog/jmxfetch add-gc-test --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/jmxfetch.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/add-gc-test .agents/skills/add-gc-test && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .agents/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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/jmxfetch --skill add-gc-test -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install DataDog/jmxfetch add-gc-test --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/jmxfetch.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/add-gc-test .cursor/skills/add-gc-test && 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 "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .cursor/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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/jmxfetch.git --path .claude/skills/add-gc-test--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/jmxfetch --skill add-gc-test -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install DataDog/jmxfetch add-gc-test --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/jmxfetch.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/add-gc-test .gemini/skills/add-gc-test && 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 "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .gemini/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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/jmxfetch add-gc-testInstalls 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/jmxfetch --skill add-gc-test -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/DataDog/jmxfetch.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/add-gc-test .github/skills/add-gc-test && 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 "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .github/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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/jmxfetch --skill add-gc-test -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/jmxfetch add-gc-test --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/DataDog/jmxfetch.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/add-gc-test .opencode/skills/add-gc-test && 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 "add-gc-test" agent skill from https://github.com/DataDog/jmxfetch/tree/master/.claude/skills/add-gc-test into .opencode/skills/add-gc-test/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-gc-test", 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
add-gc-test- GitHub stars
- 109
- Token cost
- ~1.1k tokens
- SKILL.md length
- 299 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Add integration tests to TestGCMetrics.java for new GC collector support added to new-gc-default-jmx-metrics.yaml.
- Works in 4 steps: Read… → Read… → Read… → …
- A PR adds a new garbage collector to the metrics YAML without a corresponding test
- SKILL.md covers Changes Introducing New GC…, Your Task, Patterns and Code Style Requirements, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Add Gc Test is an agent skill from DataDog/jmxfetch, published by the product's own GitHub organization. Add integration tests to TestGCMetrics.java for new GC collector support added to new-gc-default-jmx-metrics.yaml. Use when a PR adds a new garbage collector to the metrics YAML without a corresponding test.
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.
It sits in Testing & QA, covering Integration testing. It works with Java and Datadog.
When your agent uses it
- A PR adds a new garbage collector to the metrics YAML without a corresponding test
- Tasks that involve Integration testing
Example prompts
- “/add-gc-test”
Requirements
- Pre-approved tools (allowed-tools): Read, Edit, Grep, Bash(git diff *), Bash(git log *), Bash(./mvnw *)
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Read src/main/resources/org/datadog/jmxfetch/new-gc-default-jmx-metrics.yaml — identify which new collector name: entries were added and…
- Read src/test/java/org/datadog/jmxfetch/TestGCMetrics.java — understand existing test patterns and pick up on the startAndGetMetrics…
- Read src/test/java/org/datadog/jmxfetch/util/server/JDKImage.java — confirm available JDK image constants (JDK_8, JDK_11, JDK_11_OPENJ9…
- Add a new @Test method to TestGCMetrics.java following the patterns below.
What it can do on your machine
Read from SKILL.md and the folder at commit 859d091. 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:
ReadEditGrepBash(git diff *)Bash(git log *)Bash(./mvnw *)
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 java, diff and 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
Add Gc Test loads about 1.1k tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 299 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 299 words (~1,116 tokens).
“You are helping add an integration test to TestGCMetrics.java for new GC collector support.”
- name
- add-gc-test
- allowed-tools
- Read, Edit, Grep, Bash(git diff *), Bash(git log *), Bash(./mvnw *)
- argument-hint
- branch-or-commit
Files
Just SKILL.md in .claude/skills/add-gc-test of DataDog/jmxfetch.
Open the folder on GitHubat commit 859d091
Compare with similar skills
Add Gc Test 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 |
|---|---|---|---|---|---|---|
| Add Gc Test this skillDataDog/jmxfetch | 109 | — | ~1.1k | Automated safety check: Pass | Custom licence | |
| Java SDK E2E Test with Replay Snapshotgithub/copilot-sdk | 11k | — | ~1.8k | Automated safety check: Pass | MIT | |
| Update All Versionsgroovy/GMavenPlus | 306 | — | ~807 | Automated safety check: Pass | Custom licence | |
| Resolve Muzzle CIDataDog/dd-trace-java | 736 | — | ~3.2k | Automated safety check: Pass | Apache-2.0 | |
| Datadog Terraform Provider Test RunnerDataDog/terraform-provider-datadog | 468 | — | ~949 | Automated safety check: Pass | MPL-2.0 | |
| Fix Broken Datadog Provider TestsDataDog/terraform-provider-datadog | 468 | — | ~2.4k | Automated safety check: Notes | MPL-2.0 |
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- Official
Update All Versions
groovy/GMavenPlus
A skill your agent uses when refreshing GMavenPlus Groovy support, Maven dependency and plugin versions, and integration-test POM versions.
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DataDog/dd-trace-java
Diagnose and resolve dd-trace-java CI failures from a module's muzzle task or the runMuzzle aggregate.
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Runs Datadog Terraform provider acceptance tests in none, true or false record modes, then saves trimmed output and pass, fail and skip counts to a timestamped file.
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DataDog/terraform-provider-datadog
Runs an end-to-end workflow to diagnose, reproduce, fix and validate a failing integration test in the Datadog Terraform provider, ending with a draft PR.
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Prepares a jmxfetch release by bumping the version in pom.xml, README.md, and test.yml, and populating the CHANGELOG.md entry.
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Starts a new jmxfetch development cycle by bumping to the next SNAPSHOT version in pom.xml, README.md, and test.yml, and adding a new CHANGELOG.md placeholder.
Related
Categories
Questions about Add Gc Test
What does Add Gc Test do?
Add integration tests to TestGCMetrics.java for new GC collector support added to new-gc-default-jmx-metrics.yaml. Add Gc Test is an agent skill from DataDog/jmxfetch, published by the product's own GitHub organization.yaml.
When should I use Add Gc Test?
Add Gc Test fits situations like: A PR adds a new garbage collector to the metrics YAML without a corresponding test; tasks that involve Integration testing.
How do I install Add Gc Test in Claude Code?
Run `npx skills add DataDog/jmxfetch --skill add-gc-test -a claude-code`. Or copy the skill folder (.claude/skills/add-gc-test in DataDog/jmxfetch) into .claude/skills/add-gc-test in your project. Claude Code loads it when a task matches its description.
How do I install Add Gc Test in Codex?
Run `npx skills add DataDog/jmxfetch --skill add-gc-test -a codex`. Or copy the skill folder (.claude/skills/add-gc-test in DataDog/jmxfetch) into .agents/skills/add-gc-test in your project. Codex loads it when a task matches its description.
Can I use Add Gc Test 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/jmxfetch --skill add-gc-test -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/add-gc-test, .gemini/skills/add-gc-test, .github/skills/add-gc-test and .opencode/skills/add-gc-test in your project.
What does Add Gc Test need to run?
SKILL.md names no scripts, command-line tools or credentials: Add Gc Test is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Edit, Grep, Bash(git diff *), Bash(git log *), Bash(./mvnw *).
Does Add Gc Test 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 Add Gc Test 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 Add Gc Test use?
Add Gc Test 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 Add Gc Test use?
About 1.1k tokens (SKILL.md is roughly 4.5k 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 Add Gc Test?
Skills that share tags, products or a category with Add Gc Test: Java SDK E2E Test with Replay Snapshot (github/copilot-sdk, 11k stars), Update All Versions (groovy/GMavenPlus, 306 stars), Resolve Muzzle CI (DataDog/dd-trace-java, 736 stars) and Datadog Terraform Provider Test Runner (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 Add Gc Test?
DataDog (a GitHub organization, an official publisher) maintains it in DataDog/jmxfetch, which has 109 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on July 31, 2026.
Source: DataDog/jmxfetch on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.