Planetscale

PlanetScale API Skill

Quick Start

PlanetScale provides branching workflows for MySQL. Install the @planetscale/database serverless driver to interact with it seamlessly over HTTP in Edge environments.

npm install @planetscale/database

Common Workflows

Non-Blocking Schema Changes

PlanetScale prohibits direct schema modifications in production. You must branch your database, apply the DDL (e.g., via Prisma db push), test your application, and then create a Deploy Request in PlanetScale to merge the schema change without locking tables.

Production Patterns

Edge Database Access

Traditional MySQL TCP connections (mysql2) are difficult in Vercel Edge/Cloudflare Workers due to connection pooling limits. Always utilize the @planetscale/database fetch-based driver to eliminate connection overhead and utilize connectionless HTTP execution.

Error Recovery

Handle standard MySQL errors wrapped by the serverless driver. The driver natively supports fetch retries. However, schema mismatch errors (e.g., querying a column that hasn't merged to main yet) require application-level feature flagging during the deploy window.

Security Notes

PlanetScale passwords represent highly privileged access. Scope your database passwords explicitly (e.g., read-only for analytics branches).

Performance Considerations

PlanetScale caches connections at the proxy layer, meaning HTTP fetch calls are remarkably fast. However, extremely large payloads over HTTP will incur JSON parsing overhead compared to binary TCP streams. Keep query results paginated.

Testing Guidance

Integrate the PlanetScale CLI (pscale) into your CI/CD. Create a new branch dynamically for every pull request, run your E2E test suite against the branch, and delete it upon success.

Troubleshooting

If you receive 'Foreign key constraints are not supported', note that PlanetScale relies on application-level relations (e.g., via Prisma's relationMode = "prisma") rather than database-level FKs to ensure horizontal scalability across Vitess shards.

References

• PlanetScale Serverless JS

Related Skills

• Vercel
• Cloudflare
• Clerk

Why use this skill

Use this when your agent works with planetscale — structured patterns beat pasted docs and prevent common hallucinations.

AI pitfalls

• Inventing column names or schema fields
• Using deprecated driver methods or wrong connection strings
• Omitting connection pooling or transaction boundaries

Production checklist

• Migrations version-controlled and applied via CI
• Connection limits and pooling configured
• Backups and restore procedure documented

Related skills

• vercel — related to
• cloudflare — related to
• clerk — related to

Last Verified: 2026-07-02