Walkthrough
alexanderop/walkthrough
Generates a self-contained HTML file with an interactive, clickable Mermaid diagram (flowchart or ER diagram) that explains how a codebase feature, flow, architecture, or database schema works.
Find duplicate ownership, hidden second sources of truth, and contract drift in layered codebases.
Install Find Duplicate Ownership
$ npx skills add instructa/agent-skills --skill find-duplicate-ownership -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install instructa/agent-skills find-duplicate-ownership --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/instructa/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .claude/skills/find-duplicate-ownership && 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 "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .claude/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownershipType 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 instructa/agent-skills --skill find-duplicate-ownership -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install instructa/agent-skills find-duplicate-ownership --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/instructa/agent-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .agents/skills/find-duplicate-ownership && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .agents/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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 instructa/agent-skills --skill find-duplicate-ownership -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install instructa/agent-skills find-duplicate-ownership --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/instructa/agent-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .cursor/skills/find-duplicate-ownership && 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 "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .cursor/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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/instructa/agent-skills.git --path skills/engineering/find-duplicate-ownership--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 instructa/agent-skills --skill find-duplicate-ownership -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install instructa/agent-skills find-duplicate-ownership --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/instructa/agent-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .gemini/skills/find-duplicate-ownership && 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 "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .gemini/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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 instructa/agent-skills find-duplicate-ownershipInstalls 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 instructa/agent-skills --skill find-duplicate-ownership -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/instructa/agent-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .github/skills/find-duplicate-ownership && 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 "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .github/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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 instructa/agent-skills --skill find-duplicate-ownership -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install instructa/agent-skills find-duplicate-ownership --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/instructa/agent-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/engineering/find-duplicate-ownership .opencode/skills/find-duplicate-ownership && 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 "find-duplicate-ownership" agent skill from https://github.com/instructa/agent-skills/tree/main/skills/engineering/find-duplicate-ownership into .opencode/skills/find-duplicate-ownership/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "find-duplicate-ownership", 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
find-duplicate-ownership- GitHub stars
- 139
- Token cost
- ~1.3k tokens
- SKILL.md length
- 620 words
- Files
- 7 (incl. references)
- Skills in repo
- 17
- Repo updated
- First seen
- Licence
- None found
At a glance
Find duplicate ownership, hidden second sources of truth, and contract drift in layered codebases.
- Works in 5 steps: Define the audit target before searching. → Build a taxonomy first. → Search for ownership smells, not words. → …
- Reviewing normalization
- SKILL.md covers Overview, Workflow, Heuristics and Subagent Use, plus 3 more sections
- Calls rg
What it does
Find Duplicate Ownership is an agent skill from instructa/agent-skills. Find duplicate ownership, hidden second sources of truth, and contract drift in layered codebases. Use when reviewing normalization, validation, defaulting, canonicalization, persistence mapping, runtime-vs-durable state, duplicated helpers, query or cache ownership, or any "who owns this rule?" architecture question. Especially useful for SSOT audits across frontend, backend, shared core, and adapter layers, and when the user explicitly asks for duplicate-ownership exploration with subagents.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including reference files (for example `README.md`, `agents/openai.yaml` and `references/audit-prompts.md`).
It sits in Agent Workflows, covering Database schema design and Subagents. The repository describes itself as: A curated collection of agent-skills.
When your agent uses it
- Reviewing normalization
- Canonicalization
- Persistence mapping
- Runtime-vs-durable state
Example prompts
- “who owns this rule?”
- “/find-duplicate-ownership”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Define the audit target before searching.
- Build a taxonomy first.
- Search for ownership smells, not words.
- Separate true duplicates from valid boundaries.
- For each finding, name the winning owner.
What it can do on your machine
Read from SKILL.md and the folder at commit d49c149. 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:
rg
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
Find Duplicate Ownership loads about 1.3k tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 131 tokens; SKILL.md has 620 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 620 words (~1,269 tokens).
“Audit the codebase for multiply-owned rules instead of blindly grepping normalize. Classify each case as real SSOT drift, local dedupe cleanup, legitimate boundary work, or legitimate domain constraint.”
- name
- find-duplicate-ownership
Files
SKILL.md and 6 other files (references) in skills/engineering/find-duplicate-ownership of instructa/agent-skills.
- SKILL.md
- README.md
- agents/duplicate-ownership-explorer.toml
- agents/openai.yaml
- agents/ownership-taxonomy-mapper.toml
- agents/ssot-judge.toml
- references/audit-prompts.md
Open the folder on GitHubat commit d49c149
Compare with similar skills
Find Duplicate Ownership 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 |
|---|---|---|---|---|---|---|
| Find Duplicate Ownership this skillinstructa/agent-skills | 139 | — | ~1.3k | Automated safety check: Pass | None | |
| Walkthroughalexanderop/walkthrough | 141 | — | ~3.4k | Automated safety check: Notes | None | |
| Friction ReviewThibautBaissac/rails_ai_agents | 665 | — | ~1.7k | Automated safety check: Notes | MIT | |
| Reviewgetsentry/sentry-react-native | 1.8k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Reviewgetsentry/sentry-dart | 873 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Subagent Coordinatorflyxl/datazen | 114 | — | ~908 | Automated safety check: Pass | GPL-3.0 |
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Related
Questions about Find Duplicate Ownership
What does Find Duplicate Ownership do?
Find duplicate ownership, hidden second sources of truth, and contract drift in layered codebases. Find Duplicate Ownership is an agent skill from instructa/agent-skills. Find duplicate ownership, hidden second sources of truth, and contract drift in layered codebases.
When should I use Find Duplicate Ownership?
Find Duplicate Ownership fits situations like: reviewing normalization; canonicalization; persistence mapping; runtime-vs-durable state.
How do I install Find Duplicate Ownership in Claude Code?
Run `npx skills add instructa/agent-skills --skill find-duplicate-ownership -a claude-code`. Or copy the skill folder (skills/engineering/find-duplicate-ownership in instructa/agent-skills) into .claude/skills/find-duplicate-ownership in your project. Claude Code loads it when a task matches its description.
How do I install Find Duplicate Ownership in Codex?
Run `npx skills add instructa/agent-skills --skill find-duplicate-ownership -a codex`. Or copy the skill folder (skills/engineering/find-duplicate-ownership in instructa/agent-skills) into .agents/skills/find-duplicate-ownership in your project. Codex loads it when a task matches its description.
Can I use Find Duplicate Ownership 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 instructa/agent-skills --skill find-duplicate-ownership -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/find-duplicate-ownership, .gemini/skills/find-duplicate-ownership, .github/skills/find-duplicate-ownership and .opencode/skills/find-duplicate-ownership in your project.
What does Find Duplicate Ownership need to run?
Going by SKILL.md and its folder, Find Duplicate Ownership needs the command-line tools its instructions call (rg).
Does Find Duplicate Ownership 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 Find Duplicate Ownership 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 Find Duplicate Ownership use?
No licence was found for Find Duplicate Ownership or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Find Duplicate Ownership use?
About 1.3k tokens (SKILL.md is roughly 5.1k 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 746 tokens, read only when the agent opens those files.
What are the alternatives to Find Duplicate Ownership?
Skills that share tags, products or a category with Find Duplicate Ownership: Walkthrough (alexanderop/walkthrough, 141 stars), Friction Review (ThibautBaissac/rails_ai_agents, 665 stars), Review (getsentry/sentry-react-native, 1.8k stars) and Review (getsentry/sentry-dart, 873 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Find Duplicate Ownership?
instructa (a GitHub organization) maintains it in instructa/agent-skills, which has 139 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on September 28, 2026.
Source: instructa/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.