controllers

controllers is a cursor rule for Cursor from hatefsystems/search-engine-core. It costs 0 tokens per session (347 once invoked), scanned A, original, Apache-2.0.

Coding rules for registering web controllers and starting their services only when needed. A controller connects incoming web requests to the code that handles them.

In plain words
What is it for?
Use them when adding controllers, registering GET or POST API routes, and implementing delayed service initialization with error handling.
Why use it?
They prevent route-registration problems and startup-order errors that can occur when services are created too early.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is #include "../../include/routing/Controller.h".

Good fit Use them when adding controllers, registering GET or POST API routes, and implementing delayed service initialization with error handling.

Compare 6 cursor rules from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/hatefsystems/search-engine-core
agentmods
npx agentmods add rules/hatefsystems/search-engine-core/controllers

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 controllers

README.md
[![agentmods](https://agentmods.dev/badge/rules/hatefsystems/search-engine-core/controllers/github.svg)](https://agentmods.dev/rules/hatefsystems/search-engine-core/controllers)
Your own site
<a href="https://agentmods.dev/rules/hatefsystems/search-engine-core/controllers"><img src="https://agentmods.dev/badge/rules/hatefsystems/search-engine-core/controllers/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 controllers

Your own site · 80×15
<a href="https://agentmods.dev/rules/hatefsystems/search-engine-core/controllers"><img src="https://agentmods.dev/badge/rules/hatefsystems/search-engine-core/controllers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 347 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.00347
Opus 5.5 $0.00000 $0.00139
Sonnet 5.5 $0.00000 $0.00069
Haiku 4.5 $0.00000 $0.00035

Measured 1mo ago against content hash 0962b2cb5501, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

controllers 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 1mo 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/controllers.mdc · 57 lines

What it actually says

Controller Rules

Required Includes

#include "../../include/routing/Controller.h"
#include "../../include/routing/RouteRegistry.h"

No Namespaces

Controllers must NOT use namespaces (breaks ROUTE_CONTROLLER macro). Use global namespace.

Route Registration (in header, after class)

ROUTE_CONTROLLER(MyController) {
    using namespace routing;
    REGISTER_ROUTE(HttpMethod::GET, "/api/v2/my-endpoint", myEndpoint, MyController);
    REGISTER_ROUTE(HttpMethod::POST, "/api/v2/another-endpoint", anotherEndpoint, MyController);
}
  • No separate *_routes.cpp files. No namespaces around controller class.

Lazy Initialization

Never initialize services in the controller constructor (static initialization order fiasco).

// ✅ CORRECT - with error handling
mutable std::unique_ptr<DomainStorage> domainStorage_;
DomainStorage* getDomainStorage() const {
    if (!domainStorage_) {
        try {
            LOG_INFO("Lazy initializing DomainStorage");
            domainStorage_ = std::make_unique<DomainStorage>();
        } catch (const std::exception& e) {
            LOG_ERROR("Failed to lazy initialize DomainStorage: " + std::string(e.what()));
            throw;
        }
    }
    return domainStorage_.get();
}
  • Declare as mutable std::unique_ptr<Service>
  • Use getter methods with null check and create on first use
  • Add try-catch and logging in getters
  • Use getter methods instead of direct member access
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. 1mo ago First seen · 57 lines · 0 tokens per session scan A 0962b2cb5501

Subscribe to this mod's changes

controllers is a cursor rule published in the GitHub repository hatefsystems/search-engine-core (5 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 347 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.