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chub: Cursor rule for Cursor

.cursorrules

cursorrules is a cursor rule for Cursor from nrl-ai/chub. It costs 468 tokens per session, scanned A, original, MIT.

A set of project rules and pinned documentation references for a Rust command-line and library project.

In plain words
What is it for?
Use it when changing the project's Rust code, especially its core logic, command-line interface, asynchronous runtime, routing, or data-serialization code.
Why use it?
It keeps changes consistent with the project's code layout, formatting, naming, testing, and compatibility requirements. Rust is a programming language; a command-line tool runs from a terminal.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

This is nrl-ai/chub's own configuration. It tells Cursor how to work on chub itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything chub configures →

not rated 11repo 7mo ago A scan 468 tokens original MIT
View source ↗ nrl-ai/chub chub.nrl.ai
Reuse

Borrowing it

Nothing to install: this file belongs to nrl-ai/chub. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nrl-ai/chub/main/.cursorrules
Clone the repo
git clone --depth 1 https://github.com/nrl-ai/chub

Made for: Cursor.

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.

agentmods badge for cursorrules

README.md
[![agentmods](https://agentmods.dev/badge/rules/nrl-ai/chub/cursorrules/github.svg)](https://agentmods.dev/rules/nrl-ai/chub/cursorrules)
Your own site
<a href="https://agentmods.dev/rules/nrl-ai/chub/cursorrules"><img src="https://agentmods.dev/badge/rules/nrl-ai/chub/cursorrules/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.

agentmods 80×15 button for cursorrules

Your own site · 80×15
<a href="https://agentmods.dev/rules/nrl-ai/chub/cursorrules"><img src="https://agentmods.dev/badge/rules/nrl-ai/chub/cursorrules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 468 This file is loaded in full into every session.
When invoked 468 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00468 $0.00468
Opus 5.5 $0.00187 $0.00187
Sonnet 5.5 $0.00094 $0.00094
Haiku 4.5 $0.00047 $0.00047

Measured 2mo ago against content hash d71666e14362, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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.

.cursorrules · 38 lines

What it actually says

Project Rules

  • This is a Rust CLI + library project (workspace with chub-core and chub-cli crates)
  • Run cargo fmt --all and cargo clippy --all -- -D warnings before committing
  • All business logic goes in chub-core; CLI/output/MCP concerns go in chub-cli
  • Maintain byte-for-byte format compatibility with the original JS Context Hub
  • Use serde(rename) attributes to keep camelCase JSON field names
  • Tests are inline #[cfg(test)] blocks, not separate test files (except integration tests)
  • Do not add Co-Authored-By trailers to commits

Pinned Documentation

Use chub get <id> to fetch these docs when working with these libraries:

  • serde/derive (rust) — Core serialization framework — used everywhere for JSON/YAML
  • clap/derive (rust) — CLI argument parsing with derive macros
  • tokio/runtime (rust) — Async runtime for MCP server and HTTP serving
  • axum/routing (rust) — HTTP framework for chub serve

Project Context

Use chub get project/<name> or ask Chub for these:

  • project/architecture — Crate layout, data flow, and key design decisions
  • project/conventions — Rust coding standards and patterns used in this project
  • project/team-features — How team features work and how to extend them

Module: cli (crates/chub-cli/**)

  • Each command in its own file under src/commands/
  • Use owo-colors for terminal output, support --json flag on all commands
  • MCP tools use schemars::JsonSchema for parameter schema generation

Module: core (crates/chub-core/**)

  • No CLI concerns (no stdout/stderr, no clap, no owo-colors)
  • All public functions return Result using crate::error::Error
  • Search pipeline: tokenizer -> BM25 -> inverted index -> lexical boost

Module: team (crates/chub-core/src/team/**)

  • Team features live in .chub/ directory (git-tracked)
  • Three-tier config: ~/.chub/ -> .chub/ -> .chub/profiles/
  • All team modules must work gracefully when .chub/ doesn't exist
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. 2mo ago First seen · 38 lines · 468 tokens per session scan A d71666e14362

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository nrl-ai/chub (11 stars, last pushed 7mo ago), licensed MIT. It adds 468 tokens to every session, about $0.0019 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.

LanguagesRustai-contextandrew-ngcontext-hubdeveloper-toolsllm-agentsrust-cli
Related

cursorrules compared with cursor rules from other repositories

cursorrules next to 6 cursor rules from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
cursorrulesnrl-ai/chubCursor rule117mo agoMITA468Cursor
rust-architectplatinoff/poolAICursor rule418d agoMITA3,367Cursor
coreSaynaAI/saynaCursor rule3175mo agoApache-2.0A1,582Cursor
table-of-contents-standardbriangmilnes/APAS-VERUSCursor rule101mo agoMITA795Cursor
arc-deref-patternbriangmilnes/APAS-VERUSCursor rule101mo agoMITA793Cursor
wrap-vs-specifybriangmilnes/APAS-VERUSCursor rule101mo agoMITA0Cursor
spec-fn-namingbriangmilnes/APAS-VERUSCursor rule101mo agoMITA431Cursor