Convex

Setup

On first use, read setup.md for integration guidelines.

When to Use

User is building, debugging, or scaling a Convex backend and needs reliable patterns for data modeling, queries, mutations, actions, auth, and deployments.

This skill focuses on implementation quality and operational safety, not generic framework tutorials.

Architecture

Memory lives in ~/convex/. See memory-template.md for structure and status fields.

~/convex/
|- memory.md               # Durable project context and technical decisions
|- schema-notes.md         # Table design and index rationale
|- rollout-notes.md        # Deploy and incident learnings
`- auth-notes.md           # Auth model and permission edge cases

Quick Reference

Use the smallest relevant file for the current task.

Requirements

• No API keys or external credentials are required by this skill itself.
• TOKEN/KEY: Not required by this skill.
• If a project uses third-party integrations, treat those credentials as user-managed secrets and never persist raw values in memory files.

Data Storage

This skill stores reusable context only under ~/convex/:

• memory file for durable project context and decisions
• schema notes for modeling and index rationale
• rollout notes for deployment and incident lessons
• auth notes for permission and boundary edge cases

Do not store secrets, access tokens, or personal data unless the user explicitly requests it.

Core Rules

1. Model Access Patterns Before Writing Schema

Define tables and indexes from real read paths first:

• Which fields are filtered most often
• Which sort order is needed
• Which uniqueness guarantees are required

Do not rely on table scans in production paths.

2. Keep Function Boundaries Strict

Use each function type for its intended purpose:

• Query: read-only and deterministic
• Mutation: validated state changes
• Action: external side effects and network calls

Do not mix external calls inside deterministic data paths.

3. Enforce Auth and Authorization at Every Entry Point

Treat every query, mutation, action, and HTTP entrypoint as untrusted input:

• Resolve identity explicitly
• Check workspace or tenant boundaries
• Validate ownership before returning or mutating records

Never trust client-provided identifiers without server checks.

4. Design Indexes for Stability, Not Just Speed

Create indexes that match long-term product workflows:

• Primary user lookup paths
• Admin and backoffice paths
• Background processing queues

Document index intent so future changes do not break critical queries.

5. Make Writes Idempotent for Retries

For webhooks and external callbacks:

• Use stable idempotency keys
• Upsert safely when replayed
• Record processing status

A retry should not create duplicate side effects.

6. Ship with Safe Rollout Discipline

Before deploying schema or logic changes:

• Verify backward compatibility for current clients
• Prepare migration steps for renamed fields or tables
• Confirm failure mode and rollback path

Never deploy unreviewed breaking data changes.

7. Preserve Debuggability in Production

When fixing incidents:

• Capture a minimal reproduction query
• Keep structured logs around actor, function, and record ids
• Record final root cause and preventive rule in memory

Fast diagnosis compounds over time.

Common Traps

• Building schema from entities only, not query paths -> slow reads and rework.
• Putting network side effects in deterministic logic -> nondeterministic failures.
• Treating auth as a UI concern -> cross-tenant data leaks.
• Adding indexes reactively during outages -> unstable rollout under pressure.
• Shipping breaking schema changes without migration staging -> runtime failures.
• Ignoring idempotency for callbacks -> duplicate writes and billing errors.

Security & Privacy

Data that leaves your machine:

• None by default from this skill itself.

Data that stays local:

• Convex project context and decisions under ~/convex/.

This skill does NOT:

• Automatically call external services.
• Manage or store secrets outside user-approved files.
• Apply destructive schema changes without explicit confirmation.
• Modify files outside ~/convex/ for memory.

Related Skills

Install with clawhub install <slug> if user confirms:

• backend - Service architecture and operational reliability patterns.
• typescript - Type-safe design and implementation for app and backend code.
• javascript - Runtime behavior and language-level debugging workflows.

Feedback

• If useful: clawhub star convex
• Stay updated: clawhub sync