# convex

Routes Convex backend tasks to dedicated builder skills and enforces global rules for queries, mutations, and schemas. Useful as the starting point for any Convex project.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 5700 installs · ★ 405
- Author: waynesutton
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/waynesutton/builder-skills/tree/HEAD/skills/convex/SKILL.md
- Updated: 2026-09-28
- HTML: https://affpapa.org/en/nevibecode/skills/waynesutton-convex

## What it does

This skill acts as the entry point for Convex development. It maps tasks to sixteen specialized skills such as `convex-functions`, `convex-schema-validator`, or `convex-realtime`. If no specific skill matches, the baseline rules in this guide still apply.

The instructions require `args` and `returns` validators on every function, even internal ones. Reads must use `withIndex`, because running `.filter()` over a table scan causes failures as datasets grow. Mutations have to stay idempotent. For scheduling and cron jobs, the agent must target only `internal.*` functions.

Editing files inside `convex/_generated/` is strictly forbidden. The skill also blocks calling `Date.now()` inside queries and requires passing timestamps as arguments instead. For local work, run `npx convex dev`. Before guessing any API behavior, the model must read `docs.convex.dev/llms.txt`.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/convex/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/convex/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/convex/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/convex/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install waynesutton/builder-skills convex
```

2. **Manually: put the files in place**
- File: `.github/skills/convex/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/waynesutton/builder-skills --path skills/convex
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/convex/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/waynesutton/builder-skills/tree/HEAD/skills/convex/SKILL.md

## When to use it
- route Convex work to the appropriate specialized builder skill
- enforce `args` and `returns` validators across all functions
- replace unindexed table scans with `withIndex` queries
- schedule background jobs safely using `internal.*` functions

## Example prompts
- Help me set up Convex tables and indexes for the project
- Make this Convex profile mutation idempotent
- Schedule an internal cron job to run every hour in Convex

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 5e700899ab4b7715.

BEGIN THIRD-PARTY FILE 5e700899ab4b7715
```text
---
name: convex
description: Routes Convex work to the right builder skill and covers the handful of rules that apply everywhere: validators on every function, withIndex over filter, idempotent mutations, internal functions for scheduling. Use when a task mentions Convex and no more specific skill matches, or as the first stop before picking one.
---

# Convex

Start here, pick the matching skill below, and load it. If nothing matches, the rules at the bottom still apply.

## Pick a skill

| Skill | Load when |
| --- | --- |
| convex-best-practices | general patterns, project structure, "is this the Convex way" |
| convex-functions | queries, mutations, actions, internal functions, error handling |
| convex-schema-validator | tables, indexes, validators, `v.*` types, schema changes |
| convex-realtime | useQuery, optimistic updates, pagination, presence, rerender churn |
| convex-http-actions | webhooks, REST endpoints, `convex/http.ts`, Stripe or Clerk callbacks |
| convex-file-storage | uploads, upload URLs, serving files, storage cleanup |
| convex-cron-jobs | crons.ts, runAfter, runAt, batching, a cron that is not firing |
| convex-migrations | backfills, renaming fields, schema evolution with live data |
| convex-agents | AI agents, threads, tools, streaming, RAG with `@convex-dev/agent` |
| convex-component-authoring | building a reusable component package, `defineComponent` |
| convex-security-check | fast pre ship audit: auth on public functions, exposed data |
| convex-security-audit | deep review: authorization model, injection, rate limits, secrets |
| avoid-feature-creep | scope pushback, MVP cuts, "just one more feature" |
| project-workflow | multi step tasks, PRDs in prds/, task.md, plans for review |
| project-docs | syncing task.md, changelog.md, files.md with shipped code |
| git-safety | revert, undo, reset, checkout, clean, stash, force push |

Two skills often apply at once. Load the domain skill for the code and the process skill for the workflow, for example convex-functions plus project-workflow.

## Rules that hold everywhere

- Every function declares `args` and `returns` validators, including internal ones.
- Read through `withIndex`. `.filter()` on a table scan is a bug waiting for data.
- Mutations are idempotent. Check current state, return early when there is nothing to do.
- Schedule and cron only `internal.*` functions. Never `api.*`.
- Never call `Date.now()` inside a query. Pass time in as an argument.
- Use `npx convex dev` for development. Do not run `npx convex deploy` unless asked.
- Fetch https://docs.convex.dev/llms.txt before trusting memory about an API.

## Do not

- Edit anything under `convex/_generated/`.
- Use `crons.daily`, `crons.hourly`, or `crons.weekly`. Use `crons.interval` or `crons.cron`.
- Put `"use node"` in a file that also exports queries or mutations.
- Run git commands that discard work without loading git-safety first.

## Docs

- https://docs.convex.dev/llms.txt
```
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