Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
A skill your agent uses when auditing a codebase for semantic duplication — functions that do the same thing but have different names or implementations, especially common in LLM-generated codebases
Install Finding Duplicate Functions
$ npx skills add bobmatnyc/claude-mpm --skill finding-duplicate-functions -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install bobmatnyc/claude-mpm finding-duplicate-functions --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/bobmatnyc/claude-mpm.git skills-src && mkdir -p .claude/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .claude/skills/finding-duplicate-functions && 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 "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .claude/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functionsType 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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install bobmatnyc/claude-mpm finding-duplicate-functions --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/bobmatnyc/claude-mpm.git skills-src && mkdir -p .agents/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .agents/skills/finding-duplicate-functions && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .agents/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install bobmatnyc/claude-mpm finding-duplicate-functions --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/bobmatnyc/claude-mpm.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .cursor/skills/finding-duplicate-functions && 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 "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .cursor/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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/bobmatnyc/claude-mpm.git --path src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions--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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install bobmatnyc/claude-mpm finding-duplicate-functions --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/bobmatnyc/claude-mpm.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .gemini/skills/finding-duplicate-functions && 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 "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .gemini/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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 bobmatnyc/claude-mpm finding-duplicate-functionsInstalls 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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/bobmatnyc/claude-mpm.git skills-src && mkdir -p .github/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .github/skills/finding-duplicate-functions && 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 "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .github/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install bobmatnyc/claude-mpm finding-duplicate-functions --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/bobmatnyc/claude-mpm.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions .opencode/skills/finding-duplicate-functions && 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 "finding-duplicate-functions" agent skill from https://github.com/bobmatnyc/claude-mpm/tree/main/src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions into .opencode/skills/finding-duplicate-functions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "finding-duplicate-functions", 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
finding-duplicate-functions- GitHub stars
- 155
- Token cost
- ~1.3k tokens
- SKILL.md length
- 571 words
- Files
- 1
- Skills in repo
- 51
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when auditing a codebase for semantic duplication — functions that do the same thing but have different names or implementations, especially common in LLM-generated codebases
- Works in 6 steps: Extract Function Catalog → Categorize by Domain → Split into Categories → …
- Auditing a codebase for semantic duplication — functions that do the same thing but have different names
- SKILL.md covers Overview, When to Use, Quick Reference and Process, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Finding Duplicate Functions is an agent skill from bobmatnyc/claude-mpm. Use when auditing a codebase for semantic duplication — functions that do the same thing but have different names or implementations, especially common in LLM-generated codebases
Its SKILL.md is about 1.3k 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. The repository describes itself as: Claude Multi-Agent Project Manager — multi-channel orchestration, GitHub-first SDK mode, and plugin system for Claude. The licence is MIT.
When your agent uses it
- Auditing a codebase for semantic duplication — functions that do the same thing but have different names
- Implementations
- Especially common in LLM-generated codebases
Example prompts
- “/finding-duplicate-functions”
Workflow steps
6 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 25203d3. 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
Finding Duplicate Functions loads about 1.3k tokens when it runs. Until then it costs about 52 tokens; SKILL.md has 571 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 bobmatnyc/claude-mpm at commit 25203d3, republished under its MIT licence (© bobmatnyc). 571 words, ~1,308 tokens.
Download SKILL.mdSave it as
.claude/skills/finding-duplicate-functions/SKILL.md (or your agent's skills folder).- name
- finding-duplicate-functions
- description
- Use when auditing a codebase for semantic duplication — functions that do the same thing but have different names or implementations, especially common in LLM-generated codebases
- when_to_use
- after syntactic duplicate detection (jscpd), during codebase audits, or before major refactoring to find consolidation opportunities
- version
- 1.0.0
- category
- debugging
- author
- Jesse Vincent
- license
- MIT
- source
- https://github.com/obra/superpowers-lab/tree/main/skills/finding-duplicate-functions
- tags
- debugging, refactoring, duplication, code-quality, analysis
- effort
- medium
Finding Duplicate-Intent Functions
Overview
LLM-generated codebases accumulate semantic duplicates: functions that serve the same purpose but were implemented independently. Classical copy-paste detectors (jscpd) find syntactic duplicates but miss "same intent, different implementation."
This skill uses a two-phase approach: classical extraction followed by LLM-powered intent clustering.
When to Use
- Codebase has grown organically with multiple contributors (human or LLM)
- You suspect utility functions have been reimplemented multiple times
- Before major refactoring to identify consolidation opportunities
- After jscpd has been run and syntactic duplicates are already handled
Quick Reference
| Phase | Tool | Model | Output |
|---|---|---|---|
| 1. Extract | Extract function catalog | - | catalog.json |
| 2. Categorize | Categorize by domain | haiku model | categorized.json |
| 3. Split | Split by category | - | categories/*.json |
| 4. Detect | Find duplicates per category | opus model | duplicates/*.json |
| 5. Report | Generate prioritized report | - | report.md |
Process
Phase 1: Extract Function Catalog
Extract all functions from source files. Focus on:
- Exported functions and public methods
- Files in utility/helper directories
- Excluding test files (
*.test.*,*.spec.*,__tests__/**)
For each function capture:
- Function name and signature
- File path and location
- ~15 lines of context (enough to understand intent)
Phase 2: Categorize by Domain
Dispatch a haiku subagent to categorize functions by domain.
Insert the function catalog into the prompt. Save output as categorized.json with functions grouped into domains like:
- String manipulation
- Validation
- Path operations
- Error formatting
- Date/time formatting
- API response shaping
Phase 3: Split into Categories
Create one JSON file per category. Only categories with 3+ functions are worth analyzing for duplicates.
Phase 4: Find Duplicates (Per Category)
For each category file, dispatch an opus subagent to find semantic duplicates.
Opus is required here (not haiku) — subtle semantic matches require stronger reasoning. The subagent should identify:
- Functions with same intent, different implementation
- Recommended "survivor" function (the one to keep)
- Confidence level (HIGH/MEDIUM/LOW)
- Reasoning for the grouping
Save each output as ./duplicates/{category}.json.
Phase 5: Generate Report
Produce a prioritized markdown report grouped by confidence level.
For each duplicate group, report:
- All function names and file locations
- Recommended survivor
- Confidence level
- Brief reasoning
Show full SKILL.md (243 more words)Show less
Phase 6: Human Review
Review the report. For HIGH confidence duplicates:
- Verify the recommended survivor has tests covering all use cases
- Update callers to use the survivor
- Delete the duplicates
- Run tests to confirm no regressions
High-Risk Duplicate Zones
Focus extraction on these areas first — they accumulate duplicates fastest:
| Zone | Common Duplicates |
|---|---|
utils/, helpers/, lib/ | General utilities reimplemented |
| Validation code | Same checks written multiple ways |
| Error formatting | Error-to-string conversions |
| Path manipulation | Joining, resolving, normalizing paths |
| String formatting | Case conversion, truncation, escaping |
| Date formatting | Same formats implemented repeatedly |
| API response shaping | Similar transformations for different endpoints |
Common Mistakes
Extracting too much: Focus on exported functions and public methods. Internal helpers are less likely to be duplicated across files.
Skipping the categorization step: Going straight to duplicate detection on the full catalog produces noise. Categories focus the comparison.
Using haiku for duplicate detection: Haiku is cost-effective for categorization but misses subtle semantic duplicates. Use Opus for the actual duplicate analysis.
Consolidating without tests: Before deleting duplicates, ensure the survivor has tests covering all use cases of the deleted functions.
Red Flags
Never:
- Delete duplicates without verifying the survivor has adequate test coverage
- Use a cheap model for the duplicate detection phase (use opus)
- Skip categorization and try to find duplicates in the full catalog at once
Always:
- Run full test suite after consolidation
- Verify all callers have been updated before deletion
- Start with HIGH confidence duplicates before attempting MEDIUM or LOW
© bobmatnyc, MIT. 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 src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions of bobmatnyc/claude-mpm.
Open the folder on GitHubat commit 25203d3
Compare with similar skills
Finding Duplicate Functions 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 |
|---|---|---|---|---|---|---|
| Finding Duplicate Functions this skillbobmatnyc/claude-mpm | 155 | — | ~1.3k | Automated safety check: Pass | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 58 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 297k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Questions about Finding Duplicate Functions
What does Finding Duplicate Functions do?
A skill your agent uses when auditing a codebase for semantic duplication — functions that do the same thing but have different names or implementations, especially common in LLM-generated codebases. Finding Duplicate Functions is an agent skill from bobmatnyc/claude-mpm.
When should I use Finding Duplicate Functions?
Finding Duplicate Functions fits situations like: auditing a codebase for semantic duplication — functions that do the same thing but have different names; implementations; especially common in LLM-generated codebases.
How do I install Finding Duplicate Functions in Claude Code?
Run `npx skills add bobmatnyc/claude-mpm --skill finding-duplicate-functions -a claude-code`. Or copy the skill folder (src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions in bobmatnyc/claude-mpm) into .claude/skills/finding-duplicate-functions in your project. Claude Code loads it when a task matches its description.
How do I install Finding Duplicate Functions in Codex?
Run `npx skills add bobmatnyc/claude-mpm --skill finding-duplicate-functions -a codex`. Or copy the skill folder (src/claude_mpm/skills/bundled/debugging/finding-duplicate-functions in bobmatnyc/claude-mpm) into .agents/skills/finding-duplicate-functions in your project. Codex loads it when a task matches its description.
Can I use Finding Duplicate Functions 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 bobmatnyc/claude-mpm --skill finding-duplicate-functions -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/finding-duplicate-functions, .gemini/skills/finding-duplicate-functions, .github/skills/finding-duplicate-functions and .opencode/skills/finding-duplicate-functions in your project.
What does Finding Duplicate Functions need to run?
SKILL.md names no scripts, command-line tools or credentials: Finding Duplicate Functions is instructions for the agent only.
Does Finding Duplicate Functions 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 Finding Duplicate Functions 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 Finding Duplicate Functions use?
Finding Duplicate Functions is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Finding Duplicate Functions use?
About 1.3k tokens (SKILL.md is roughly 5.2k 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 Finding Duplicate Functions?
Skills that share tags, products or a category with Finding Duplicate Functions: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Finding Duplicate Functions?
bobmatnyc (a GitHub user) maintains it in bobmatnyc/claude-mpm, which has 155 GitHub stars. The repository holds 51 skills in this directory. The repository was last updated on August 31, 2026.
Source: bobmatnyc/claude-mpm on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.