A guide to building backends with Convex, a service for storing application data and running backend functions. It covers queries, changes, actions, HTTP endpoints, schemas, authentication, scheduled work, file storage, migrations, testing, and debugging.

Use it to create Convex functions and schemas, add authentication, schedule jobs, store files, migrate data, test backend code, and investigate slow or failing operations.

It helps keep backend data rules, validation, scheduled tasks, and performance concerns organized in one Convex project.

convex — Skill for Claude Code and Codex by bntvllnt/agent-skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add bntvllnt/agent-skills --skill convex

Clone the repo

git clone --depth 1 https://github.com/bntvllnt/agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bntvllnt/agent-skills/convex/github.svg)](https://agentmods.dev/skills/bntvllnt/agent-skills/convex)

Your own site

<a href="https://agentmods.dev/skills/bntvllnt/agent-skills/convex"><img src="https://agentmods.dev/badge/skills/bntvllnt/agent-skills/convex/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bntvllnt/agent-skills/convex"><img src="https://agentmods.dev/badge/skills/bntvllnt/agent-skills/convex.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 160 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,031 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00160	$0.03031
Opus 5.5	$0.00064	$0.01212
Sonnet 5.5	$0.00032	$0.00606
Haiku 4.5	$0.00016	$0.00303

Measured 2mo ago against content hash d6dbe94c1b12, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

convex scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

convex/SKILL.md · 230 lines

How it starts

The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Convex

Convex backend skill with a bias toward safety, observability, and index-backed queries.

Upstream Skills (Delegate When Available)

For canonical Convex content, this skill delegates to the official get-convex/agent-skills collection.

Repo: https://github.com/get-convex/agent-skills
Source of truth: each upstream skill's SKILL.md and references/

Routing precedence (use first available, in order):

Upstream skill installed locally → npx skills add get-convex/agent-skills
WebFetch the upstream SKILL.md from the raw URL below. Some upstream skills have a references/ subdirectory (e.g. convex-setup-auth, convex-create-component, convex-migration-helper, convex-performance-audit); follow internal paths the same way: https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/<skill>/references/<file>. convex-quickstart is single-file (SKILL.md only).
Fall back to the matching local reference

URLs track main. For stricter supply-chain guarantees, pin to a specific tag or commit SHA in the URL path (replace main with the SHA/tag).

Or refresh the official Convex AI files in the project itself:

npx convex ai-files install

Delegation map:

Task	Upstream skill	Fetch URL (raw `SKILL.md`)	Local fallback
New project / scaffold / add Convex	`convex-quickstart`	https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/convex-quickstart/SKILL.md	`references/quickstart.md`
Authentication setup	`convex-setup-auth`	https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/convex-setup-auth/SKILL.md	`references/auth-setup.md`
Building a reusable component	`convex-create-component`	https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/convex-create-component/SKILL.md	`references/components.md`
Plan or run a migration	`convex-migration-helper`	https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/convex-migration-helper/SKILL.md	`references/migrations.md`
Investigate performance issues	`convex-performance-audit`	https://raw.githubusercontent.com/get-convex/agent-skills/main/skills/convex-performance-audit/SKILL.md	`references/performance.md`

Read the full file on GitHub · 230 lines

Files

What ships with it

24 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 230 lines · 160 tokens per session scan A d6dbe94c1b12

Subscribe to this mod's changes

convex is a skill published in the GitHub repository bntvllnt/agent-skills (17 stars, last pushed 5mo ago), licensed MIT. It adds 160 tokens to every session and 3,031 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Backend and APIs Claude Code Databases agent-skills ai analysis opencode skills

convex next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
convexbntvllnt/agent-skills	Skill	17	5mo ago	MIT	A	160	Claude Code, Codex
go-databasemuratmirgun/gophers	Skill	9	2mo ago	MIT	A	98	Claude Code
django-expertvintasoftware/django-ai-plugins	Skill	171	3mo ago	none	A	55	Claude Code
bigquery-udfsgoogle/skills	Skill	22k	yesterday	Apache-2.0	A	132	Claude Code, Codex
supabasesupabase/agent-skills	Skill	3.0k	yesterday	MIT	A	185	Claude Code, Codex
k2cloudflare/skills	Skill	3.3k	yesterday	Apache-2.0	A	38	Claude Code
kotlin-backend-jpa-entity-mappingKotlin/kotlin-agent-skills	Skill	1.1k	7d ago	Apache-2.0	A	104	Claude Code, Codex