Code Review Graph Navigator
handsontable/handsontable
Queries a pre-built, Tree-sitter-based code graph of the whole monorepo instead of grepping call chains, for exploring, debugging, refactoring or reviewing code.
Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable.
Install Durable Test Collateral
$ npx skills add asgeirtj/system_prompts_leaks --skill durable-test-collateral -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install asgeirtj/system_prompts_leaks durable-test-collateral --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/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .claude/skills/durable-test-collateral && 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 "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .claude/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateralType 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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install asgeirtj/system_prompts_leaks durable-test-collateral --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .agents/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .agents/skills/durable-test-collateral && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .agents/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install asgeirtj/system_prompts_leaks durable-test-collateral --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .cursor/skills/durable-test-collateral && 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 "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .cursor/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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/asgeirtj/system_prompts_leaks.git --path Meta/muse-code/skills/durable-test-collateral--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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install asgeirtj/system_prompts_leaks durable-test-collateral --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .gemini/skills/durable-test-collateral && 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 "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .gemini/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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 asgeirtj/system_prompts_leaks durable-test-collateralInstalls 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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .github/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .github/skills/durable-test-collateral && 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 "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .github/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install asgeirtj/system_prompts_leaks durable-test-collateral --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/asgeirtj/system_prompts_leaks.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/Meta/muse-code/skills/durable-test-collateral .opencode/skills/durable-test-collateral && 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 "durable-test-collateral" agent skill from https://github.com/asgeirtj/system_prompts_leaks/tree/main/Meta/muse-code/skills/durable-test-collateral into .opencode/skills/durable-test-collateral/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "durable-test-collateral", 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
durable-test-collateral- GitHub stars
- 69k
- Token cost
- ~687 tokens
- SKILL.md length
- 341 words
- Files
- 1
- Skills in repo
- 124
- Repo updated
- First seen
- Licence
- CC0-1.0
At a glance
Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable.
- Governing specification makes reusable tests a deliverable
- SKILL.md covers Keep the check with the project and Prove the maintained check
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Debugging
What it does
Durable Test Collateral is an agent skill from asgeirtj/system_prompts_leaks. Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable. It keeps the smallest focused test with the delivered project and updates coverage when behavior changes. Do not load for greenfield work unless reusable tests are explicitly required, behavior-preserving refactors, verification-only work, plan/review/explanation/documentation/formatting/generated-output-only work, explicit no-change or no-tool work…
Its SKILL.md is about 690 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 Development, covering Debugging and Refactoring. The repository describes itself as: Documented system prompts from Anthropic - Claude Fable 5.1, Opus 5.5, Claude Design, Claude Code. OpenAI - ChatGPT GPT-6-Astra, Codex. Google - Gemini 3.8 Flash, 3.1 Pro… The licence is CC0-1.0.
When your agent uses it
- Governing specification makes reusable tests a deliverable
- Tasks that involve Debugging
- Tasks that involve Refactoring
Example prompts
- “/durable-test-collateral”
What it can do on your machine
Read from SKILL.md and the folder at commit e31ec21. 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.
Context cost
Durable Test Collateral loads about 687 tokens when it runs. Until then it costs about 144 tokens; SKILL.md has 341 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 asgeirtj/system_prompts_leaks at commit e31ec21, republished under its CC0-1.0 licence (© asgeirtj). 341 words, ~687 tokens.
Download SKILL.mdSave it as
.claude/skills/durable-test-collateral/SKILL.md (or your agent's skills folder).- name
- durable-test-collateral
- description
- Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable. It keeps the smallest focused test with the delivered project and updates coverage when behavior changes. Do not load for greenfield work unless reusable tests are explicitly required, behavior-preserving refactors, verification-only work, plan/review/explanation/documentation/formatting/generated-output-only work, explicit no-change or no-tool work, or when the user declines tests.
- user-invocable
- false
Durable Test Collateral
Verification is part of the delivered project when it can prevent the same behavior from breaking again. Use the project's existing framework and conventions.
Keep the check with the project
For a bug fix or behavior change, add or update the smallest maintained test in the repository's normal test layout that exercises the changed behavior. If a specification makes a reusable suite or test category a deliverable, implement that suite instead of treating it as private verification.
An inline interpreter command, heredoc, scratch script, temporary-directory test, demo, or manual probe may help diagnose the problem, but it does not replace the maintained test. Keep a useful self-authored test unless the user explicitly asks for a disposable probe.
Do not add a new test framework solely to satisfy this skill. If the repository has no maintained harness and the request does not require one, disclose when durable coverage would be disproportionate or infeasible and use the narrowest honest verification instead.
On a later turn, update the maintained test even when the old suite remains green and the user does not repeat the test request. Cover the new behavior, not merely an unrelated cleanup in the test file.
Prove the maintained check
Observe the authentic failure before the implementation change when it is safe and runnable. Then make the smallest implementation change and run the focused maintained test after the final relevant source or test edit.
Do not weaken or delete a real failing test to obtain green. Fix the product, or explain why the test's expectation is wrong before changing that expectation. Do not repeat an unchanged check solely to collect evidence.
Run a broad or full suite only when the user, a repository gate, or proportionate risk requires it. A focused regression test comes first; broad proof does not substitute for missing focused coverage.
If the real runner is unavailable but the focused test can still be authored honestly, leave the focused test in the repository and say it was not run. Do not fabricate a passing result.
© asgeirtj, CC0-1.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in Meta/muse-code/skills/durable-test-collateral of asgeirtj/system_prompts_leaks.
Open the folder on GitHubat commit e31ec21
Compare with similar skills
Durable Test Collateral 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 |
|---|---|---|---|---|---|---|
| Durable Test Collateral this skillasgeirtj/system_prompts_leaks | 69k | — | ~687 | Automated safety check: Pass | CC0-1.0 | |
| Code Review Graph Navigatorhandsontable/handsontable | 22k | — | ~939 | Automated safety check: Pass | Custom licence | |
| Analyze Projectlllllllama/RigorPilot-Skills | 497 | 1 repos | ~519 | Automated safety check: Pass | MIT | |
| Andrej Karpathy Skillduolahypercho/andrej-karpathy-skills | 249 | — | ~793 | Automated safety check: Pass | MIT | |
| Verdaccio Change Implementationverdaccio/verdaccio | 18k | — | ~1.3k | Automated safety check: Pass | MIT | |
| RoamCranot/roam-code | 517 | — | ~2.4k | Automated safety check: Pass | Apache-2.0 |
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Categories
Questions about Durable Test Collateral
What does Durable Test Collateral do?
Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable. Durable Test Collateral is an agent skill from asgeirtj/system_prompts_leaks. Load the body before the first implementation edit for a bug fix or behavior change, or when the user or governing specification makes reusable tests a deliverable.
When should I use Durable Test Collateral?
Durable Test Collateral fits situations like: governing specification makes reusable tests a deliverable; tasks that involve Debugging; tasks that involve Refactoring.
How do I install Durable Test Collateral in Claude Code?
Run `npx skills add asgeirtj/system_prompts_leaks --skill durable-test-collateral -a claude-code`. Or copy the skill folder (Meta/muse-code/skills/durable-test-collateral in asgeirtj/system_prompts_leaks) into .claude/skills/durable-test-collateral in your project. Claude Code loads it when a task matches its description.
How do I install Durable Test Collateral in Codex?
Run `npx skills add asgeirtj/system_prompts_leaks --skill durable-test-collateral -a codex`. Or copy the skill folder (Meta/muse-code/skills/durable-test-collateral in asgeirtj/system_prompts_leaks) into .agents/skills/durable-test-collateral in your project. Codex loads it when a task matches its description.
Can I use Durable Test Collateral 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 asgeirtj/system_prompts_leaks --skill durable-test-collateral -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/durable-test-collateral, .gemini/skills/durable-test-collateral, .github/skills/durable-test-collateral and .opencode/skills/durable-test-collateral in your project.
What does Durable Test Collateral need to run?
SKILL.md names no scripts, command-line tools or credentials: Durable Test Collateral is instructions for the agent only.
Does Durable Test Collateral 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 Durable Test Collateral 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 Durable Test Collateral use?
Durable Test Collateral is published under the CC0-1.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Durable Test Collateral use?
About 687 tokens (SKILL.md is roughly 2.7k 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 Durable Test Collateral?
Skills that share tags, products or a category with Durable Test Collateral: Code Review Graph Navigator (handsontable/handsontable, 22k stars), Analyze Project (lllllllama/RigorPilot-Skills, 497 stars), Andrej Karpathy Skill (duolahypercho/andrej-karpathy-skills, 249 stars) and Verdaccio Change Implementation (verdaccio/verdaccio, 18k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Durable Test Collateral?
asgeirtj (a GitHub user) maintains it in asgeirtj/system_prompts_leaks, which has 69,211 GitHub stars. The repository holds 124 skills in this directory. The repository was last updated on October 8, 2026.
Source: asgeirtj/system_prompts_leaks on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.