convex

A set of conventions for using Convex as a backend with Svelte, a web-interface framework. It describes where to keep database schemas and server functions, how the frontend calls them, and how to run development and tests.

In plain words
What is it for?
Use it when adding Convex tables or functions, importing generated APIs into Svelte, running the Convex development server, or writing tests that share the development database.
Why use it?
It gives the project a consistent place for data definitions, backend logic, generated code, and frontend calls. This reduces uncertainty about how Svelte and Convex should connect.

Cursor rule for Cursor

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.

agentmods
npx agentmods add rules/fmaclen/svelte-vibe-code/convex
Clone the repo
git clone --depth 1 https://github.com/fmaclen/svelte-vibe-code

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 203 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00203
Opus 5 $0.00000 $0.00102
Sonnet 5 $0.00000 $0.00041
Haiku 4.5 $0.00000 $0.00020

Measured 2d ago against content hash 5939b40e1bb6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d 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.

.cursor/rules/convex.mdc · 13 lines

What it actually says

Convex Conventions

  • Schema: Define tables and fields in convex/schema.ts.
  • Functions: Organize domain logic in files like convex/auth.ts and convex/messages.ts.
  • Generated code: Use the generated client/api in convex/_generated/. Import via the $convex alias when used from Svelte.
  • Dev server: Keep npm run convex running during development and tests.
  • Tests: npm test sets a Convex environment var for dev/test; tests and dev can share the same database.
  • Frontend usage: Call Convex queries/mutations from Svelte components or stores, not from server-only loaders.
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.

  1. 2d ago First seen · 13 lines · 0 tokens per session scan A 5939b40e1bb6

Subscribe to this mod's changes

convex is a cursor rule published in the GitHub repository fmaclen/svelte-vibe-code (3 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 203 tokens. 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 2026-08-31.