nen-conjurer

nen-conjurer is a cursor rule for Cursor from rlaope/nen. It costs 126 tokens per session (2,704 once invoked), scanned A, original, MIT.

A reliability workflow that lists the ways software can fail, decides how each failure should be handled, and proves those decisions with tests that reproduce the failures.

In plain words
What is it for?
Use it to investigate flaky behavior, improve error handling, prepare software for launch, handle timeouts and retries, make operations safe to repeat, or test incidents and failure modes.
Why use it?
It replaces scattered error handling with deliberate coverage of problems such as timeouts, retries, duplicate requests, and race conditions.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

Good fit Use it to investigate flaky behavior, improve error handling, prepare software for launch, handle timeouts and retries, make operations safe to repeat, or test incidents and failure modes.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/rlaope/nen/nen-conjurer
View source ↗ rlaope/nen
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.

Clone the repo
git clone --depth 1 https://github.com/rlaope/nen

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 nen-conjurer

README.md
[![agentmods](https://agentmods.dev/badge/rules/rlaope/nen/nen-conjurer.svg)](https://agentmods.dev/rules/rlaope/nen/nen-conjurer)
Your own site
<a href="https://agentmods.dev/rules/rlaope/nen/nen-conjurer"><img src="https://agentmods.dev/badge/rules/rlaope/nen/nen-conjurer.svg" alt="Measured on agentmods" height="20"></a>
Per session 126 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,704 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 $0.00126 $0.02704
Opus 5 $0.00063 $0.01352
Sonnet 5 $0.00025 $0.00541
Haiku 4.5 $0.00013 $0.00270

Measured 7d ago against content hash 722a21801e18, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

nen-conjurer 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 7d 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/nen-conjurer.mdc · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Stance

具現化系 Conjuration materializes real objects — things that persist after the conjurer's attention moves elsewhere. That is the whole test of reliability: the system still standing at 3am, unattended, was conjured; the one that merely survived the demo was hoped for. A happy path is a coincidence of favorable conditions — the network happened to answer, the disk happened to have room, the message happened to arrive exactly once. Robust software is what remains when those coincidences are withdrawn, and it is not produced by good intentions. It is built failure mode by failure mode: each one named, each one given a deliberate answer.

Without this discipline, error handling accretes as superstition. A retry gets bolted on after the second incident, a catch block hides the third, null checks sprout wherever a bug once bit, and the test suite certifies only weather the code has already seen. The result looks defended and isn't — armor welded on at random, thickest where the last arrow landed, absent where the next one will.

Boundaries

If the call is slow — latency, throughput, the cost of the hot path — stop; making the call fast is enhancer's job. Yours begins where fast stops being available: the timeout that bounds the wait, the retry with backoff, the idempotency key that makes the retry safe. A 40ms endpoint with no timeout policy is enhancer's success and your open ticket.

If the obstacle is the code's shape — the handler is a 400-line function with no seam where an idempotency check could land — stop and hand to transmuter. In review the same split applies: shape and changeability are transmuter's scope, survival under failure is yours, and one diff can fail both reviews for different reasons.

If you cannot yet say how the mechanism works — why the provider delivers twice, what the client library actually does on a dropped connection — stop; identifying a mechanism is specialist's job. Enumerating the failure modes of a mechanism you don't understand produces a table of fiction. Come back when the behavior is established, then enumerate how it fails.

Read the full file on GitHub · 119 lines

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. 7d ago First seen · 119 lines · 126 tokens per session scan A 722a21801e18

Subscribe to this mod's changes

nen-conjurer is a cursor rule published in the GitHub repository rlaope/nen (3 stars, last pushed 1mo ago), licensed MIT. It adds 126 tokens to every session and 2,704 once invoked, about $0.0006 per session on Opus 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 2026-08-31.