Agent skill

Entity Relationship Diagram

by mohitagw15856 in mohitagw15856/pm-claude-skills

Turn a data model into an entity-relationship (ER) diagram. An agent skill from mohitagw15856/pm-claude-skills.

MITAuto-check passedDevelopment

Install Entity Relationship Diagram

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/entity-relationship-diagram .claude/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .claude/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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

$skill-installer install https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram

Type 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.

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/entity-relationship-diagram .agents/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .agents/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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.

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/entity-relationship-diagram .cursor/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .cursor/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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

$ gemini skills install https://github.com/mohitagw15856/pm-claude-skills.git --path skills/entity-relationship-diagram

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/entity-relationship-diagram .gemini/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .gemini/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram

Installs 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).

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/entity-relationship-diagram .github/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .github/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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.

skills CLI

$ npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install mohitagw15856/pm-claude-skills entity-relationship-diagram --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/entity-relationship-diagram .opencode/skills/entity-relationship-diagram && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "entity-relationship-diagram" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/entity-relationship-diagram into .opencode/skills/entity-relationship-diagram/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "entity-relationship-diagram", 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: entity-relationship-diagram
GitHub stars: 1.4k
Token cost: ~824 tokens
SKILL.md length: 319 words
Files: 1
Skills in repo: 1,348
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Turn a data model into an entity-relationship (ER) diagram. An agent skill from mohitagw15856/pm-claude-skills.

Asked to design a schema
SKILL.md covers Required Inputs, Output Format, Mermaid Rules (so it renders) and Quality Checks, plus 3 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Show how tables/entities relate

What it does

Entity Relationship Diagram is an agent skill from mohitagw15856/pm-claude-skills. Turn a data model into an entity-relationship (ER) diagram. Use when asked to design a schema, model data, show how tables/entities relate, or diagram a database. Produces a ready-to-render Mermaid ER diagram (renders live, exportable as PNG/SVG) plus key attributes, cardinality, and design notes.

Its SKILL.md is about 820 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 Diagrams. It works with Mermaid. The repository describes itself as: 1255 professional Agent Skills for Claude, ChatGPT, Gemini, Cursor & Codex — PRDs, postmortems, leases, medical bills, layoffs, go-bags, new countries. Plain markdown, MIT, in… The licence is MIT.

When your agent uses it

Asked to design a schema
Show how tables/entities relate
Diagram a database

Example prompts

“/entity-relationship-diagram”

What it can do on your machine

Read from SKILL.md and the folder at commit 1cbf1f0. 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 (its code samples are mermaid).
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

Entity Relationship Diagram loads about 824 tokens when it runs. Until then it costs about 82 tokens; SKILL.md has 319 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~82
When it runs · the whole SKILL.md, loaded when a task matches: ~824

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 mohitagw15856/pm-claude-skills at commit 1cbf1f0, republished under its MIT licence (© mohitagw15856). 319 words, ~824 tokens.

Download SKILL.mdSave it as .claude/skills/entity-relationship-diagram/SKILL.md (or your agent's skills folder).

name: entity-relationship-diagram
description: Turn a data model into an entity-relationship (ER) diagram. Use when asked to design a schema, model data, show how tables/entities relate, or diagram a database. Produces a ready-to-render Mermaid ER diagram (renders live, exportable as PNG/SVG) plus key attributes, cardinality, and design notes.

Entity-Relationship Diagram Skill

Before you write a migration, it pays to see the data model: the entities, their key fields, and how they relate (one-to-many, many-to-many). This skill turns a described domain into a clean Mermaid ER diagram with proper cardinality notation and the attributes that matter.

Required Inputs

Ask for these only if they aren't already provided:

The entities — the core objects/tables (User, Order, Product…).
Relationships — how they relate, and the cardinality (a user has many orders, an order has many line items).
Key attributes — the important fields per entity (especially keys); full column lists aren't required.
The domain — what the system does, so the model is realistic.

Output Format

[Domain] — data model

One line on the scope of the model.

mermaid

erDiagram
    USER ||--o{ ORDER : places
    ORDER ||--|{ LINE_ITEM : contains
    PRODUCT ||--o{ LINE_ITEM : "appears in"
    USER {
        uuid id PK
        string email
        string name
    }
    ORDER {
        uuid id PK
        uuid user_id FK
        datetime created_at
        string status
    }
    LINE_ITEM {
        uuid id PK
        uuid order_id FK
        uuid product_id FK
        int qty
    }
    PRODUCT {
        uuid id PK
        string name
        decimal price
    }

Cardinality key — ||--o{ = one-to-many, }o--o{ = many-to-many, ||--|| = one-to-one.

Design notes — normalization choices, where a join table is needed, indexes worth adding, anything deferred.

Mermaid Rules (so it renders)

Start with erDiagram. Relationship line: A ||--o{ B : label.
Crow's-foot cardinality: || (exactly one), o{ (zero-or-many), |{ (one-or-many), o| (zero-or-one).
Attribute blocks: ENTITY { type name PK } — mark keys with PK / FK.
Entity names are usually UPPER_SNAKE; quote relationship labels that contain spaces.

Quality Checks

Every relationship has explicit, correct cardinality (not just a plain line)
Primary and foreign keys are marked (PK/FK)
Many-to-many relationships are resolved with a join entity where appropriate
Attribute types are sensible for the domain
The Mermaid block renders without edits

Anti-Patterns

Do not draw relationships without cardinality — "related" isn't a data model
Do not leave many-to-many unresolved when a join table is the right call
Do not dump every conceivable column — show the keys and the attributes that matter
Do not omit foreign keys — they're how the relationships are actually enforced
Do not break Mermaid with unquoted spaced labels

Based On

Data modeling (entity-relationship modeling, crow's-foot notation, normalization), expressed as renderable Mermaid.

Example Trigger Phrases

"Design a schema."
"Model data."
"Show how tables/entities relate."
"Diagram a database."

Files

Just SKILL.md in skills/entity-relationship-diagram of mohitagw15856/pm-claude-skills.

Open the folder on GitHubat commit 1cbf1f0

Compare with similar skills

Entity Relationship Diagram 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.

Entity Relationship Diagram compared with similar skills
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Diagram Designcathrynlavery/diagram-design	49k	1 repos	~7.6k	Automated safety check: Pass	MIT	today
Draw.io Diagram StudioAgents365-ai/drawio-skill	10k	—	~2.4k	Automated safety check: Notes	MIT	today
Pretty Mermaid Rendererimxv/Pretty-mermaid-skills	1.5k	—	~2k	Automated safety check: Pass	MIT	1 mo ago
Archify Diagram BuilderUnclecheng-li/AI_Animation	1.5k	2 repos	~4.1k	Automated safety check: Pass	MIT	6 days ago

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Works with

Mermaid

Questions about Entity Relationship Diagram

What does Entity Relationship Diagram do?

Turn a data model into an entity-relationship (ER) diagram. An agent skill from mohitagw15856/pm-claude-skills. Entity Relationship Diagram is an agent skill from mohitagw15856/pm-claude-skills. Turn a data model into an entity-relationship (ER) diagram.

When should I use Entity Relationship Diagram?

Entity Relationship Diagram fits situations like: asked to design a schema; show how tables/entities relate; diagram a database.

How do I install Entity Relationship Diagram in Claude Code?

Run `npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a claude-code`. Or copy the skill folder (skills/entity-relationship-diagram in mohitagw15856/pm-claude-skills) into .claude/skills/entity-relationship-diagram in your project. Claude Code loads it when a task matches its description.

How do I install Entity Relationship Diagram in Codex?

Run `npx skills add mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a codex`. Or copy the skill folder (skills/entity-relationship-diagram in mohitagw15856/pm-claude-skills) into .agents/skills/entity-relationship-diagram in your project. Codex loads it when a task matches its description.

Can I use Entity Relationship Diagram 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 mohitagw15856/pm-claude-skills --skill entity-relationship-diagram -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/entity-relationship-diagram, .gemini/skills/entity-relationship-diagram, .github/skills/entity-relationship-diagram and .opencode/skills/entity-relationship-diagram in your project.

What does Entity Relationship Diagram need to run?

SKILL.md names no scripts, command-line tools or credentials: Entity Relationship Diagram is instructions for the agent only.

Does Entity Relationship Diagram 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 Entity Relationship Diagram 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 Entity Relationship Diagram use?

Entity Relationship Diagram is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Entity Relationship Diagram use?

About 824 tokens (SKILL.md is roughly 3.3k 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 Entity Relationship Diagram?

Skills that share tags, products or a category with Entity Relationship Diagram: Archify Diagrams (tt-a1i/archify, 82k stars), Diagram Design (cathrynlavery/diagram-design, 49k stars), Draw.io Diagram Studio (Agents365-ai/drawio-skill, 10k stars) and Pretty Mermaid Renderer (imxv/Pretty-mermaid-skills, 1.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Entity Relationship Diagram?

mohitagw15856 (a GitHub user) maintains it in mohitagw15856/pm-claude-skills, which has 1,434 GitHub stars. The repository holds 1,348 skills in this directory. The repository was last updated on October 9, 2026.

Source: mohitagw15856/pm-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Entity Relationship Diagram

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Entity-Relationship Diagram Skill

Required Inputs

Output Format

[Domain] — data model

Mermaid Rules (so it renders)

Quality Checks

Anti-Patterns

Based On

Example Trigger Phrases

Files

Compare with similar skills

Similar skills

More from mohitagw15856/pm-claude-skills

Related

Questions about Entity Relationship Diagram