Seedweaver Mcp

io.github.FixtureForgePublished by GitHub account FixtureForgev0.2.0Updated Oct 24, 2026

Schema-aware relational test data generator with working foreign keys, for any MCP client.

VerifiedSTDIODesktop onlyDatabasesDeveloper Tools

Overview

AI-generated overview

Generates realistic, referentially coherent test data from a SQL or JSON schema, returning INSERT statements, JSON or CSV.

What you can do
  • Analyze a schema: parse pasted SQL DDL or a JSON schema and report tables, columns, relationships and generation order.
  • Generate seed data: produce rows that respect foreign keys, unique and NOT NULL constraints, with realistic names, emails, dates and decimals.
  • Export results as SQL INSERT statements (default), JSON, or CSV on paid tiers.
When to use it
Useful when you need seed or fixture data for a relational database and want foreign keys to point at real generated primary keys, for example populating a dev or test database from an existing schema.
Requirements
Runs locally over stdio, started with npx, so Node.js is needed. No accounts, API keys or environment variables are required for the free tier; the paid tier is activated with a license key passed in the SEEDWEAVER_LICENSE environment variable.
Before you install
The free tier is limited to 2 tables and 50 rows per table and excludes CSV output, deterministic seeds, custom locales and CI use; Pro costs $19 per month and needs a license key. Generated INSERT statements are meant to be run against a database, so review them before executing.

Installation

In SourceWeft

  1. Open Seedweaver Mcp in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

SeedWeaver 🌱

Generate realistic, referentially-coherent test data from your real database schema — straight from Claude, Cursor, or any MCP client.

Paste your CREATE TABLE SQL (or a JSON schema) and SeedWeaver generates seed data where foreign keys actually resolve to real primary keys, unique constraints are respected, and values are realistic (names, emails, dates, decimals). Unlike generic mock-data tools that spit out statistically random junk, SeedWeaver understands the relationships in your schema.

Ask your AI: "Generate 50 users and 200 orders for this schema" — and get INSERTs you can run immediately, with every order.user_id pointing at a user that exists.

Why SeedWeaver

Most "fake data" tools (Faker wrappers, random generators) give you isolated rows with no awareness of your schema. The moment you have foreign keys, you're back to hand-wiring relationships. SeedWeaver:

  • Resolves foreign keys — referenced tables are generated first (topological ordering), and FK columns point at real generated keys.
  • Respects constraints — unique columns stay unique, primary keys are unique, NOT NULL is honored.
  • Reads your real schema — paste Postgres/MySQL CREATE TABLE DDL directly, no manual config.
  • Realistic values — names, emails, addresses, companies, dates, decimals, enums.
  • Outputs what you need — SQL INSERT statements, JSON, or CSV.

Install

bash
npx -y seedweaver-mcp

Add to your MCP client config (Claude Desktop / Cursor / Windsurf):

json
{  "mcpServers": {    "seedweaver": {      "command": "npx",      "args": ["-y", "seedweaver-mcp"]    }  }}

Tools

ToolWhat it does
analyze_schemaParse a schema (SQL DDL or JSON) and report tables, columns, relationships, and generation order. Run this first to confirm SeedWeaver reads your schema correctly.
generate_seed_dataGenerate coherent test data. Returns SQL INSERTs (default), JSON, or CSV.

Examples

From SQL DDL:

Generate 20 rows of test data for:
CREATE TABLE users (  id UUID PRIMARY KEY,  email VARCHAR(255) UNIQUE NOT NULL,  full_name VARCHAR(100),  created_at TIMESTAMP);CREATE TABLE orders (  id SERIAL PRIMARY KEY,  user_id UUID NOT NULL REFERENCES users(id),  total DECIMAL(10,2),  status VARCHAR(20));

Every generated orders.user_id will be a real users.id.

From a JSON schema (gives you fine control — enums, ranges, per-table row counts):

json
{  "tables": [    {      "name": "users",      "rows": 20,      "columns": [        { "name": "id", "type": "uuid", "primaryKey": true },        { "name": "email", "type": "email", "unique": true },        { "name": "name", "type": "fullName" }      ]    },    {      "name": "orders",      "rows": 80,      "columns": [        { "name": "id", "type": "serial", "primaryKey": true },        { "name": "user_id", "type": "fk", "references": "users.id" },        { "name": "total", "type": "decimal", "min": 5, "max": 500 },        { "name": "status", "type": "enum", "values": ["pending", "paid", "shipped"] }      ]    }  ]}

Supported column types: uuid, serial, int, decimal, boolean, email, fullName, firstName, lastName, username, phone, address, city, country, company, url, word, sentence, paragraph, date, datetime, enum, fk.

Free vs. Pro

The free tier is fully functional for small schemas. Pro removes the limits and adds the features you need for real projects and CI.

FreePro
Tables per schema2Unlimited
Rows per table50Unlimited
Output formatsSQL, JSON+ CSV
Deterministic seeds (reproducible data)—✓
Custom locales—✓
Use in CI / automation—✓

→ Get SeedWeaver Pro — $19/mo

Activate by setting your license key:

json
{  "mcpServers": {    "seedweaver": {      "command": "npx",      "args": ["-y", "seedweaver-mcp"],      "env": { "SEEDWEAVER_LICENSE": "your-key-here" }    }  }}

License

The SeedWeaver MCP server is MIT licensed and free to run. Pro features are unlocked with a paid license key. Built with the Model Context Protocol.

Source: README.md at commit 76246f4

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v0.2.0LatestSep 16, 2026

Score

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