perform-feature-add-simulation

perform-feature-add-simulation is a cursor rule for Cursor from kunalsuri/ai-fication-kit. It costs 23 tokens per session (278 once invoked), scanned A, original, Apache-2.0.

A rehearsal of the process for adding a proposed software feature, done without changing code. It checks whether the code locations, change plan, tests, and project documentation are ready.

In plain words
What is it for?
Use it to identify affected modules, plan the files to change, check test coverage and commands, estimate context needed, and produce a go-or-no-go report.
Why use it?
It exposes missing project knowledge and likely obstacles before implementation begins, helping decide whether work should proceed.

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/kunalsuri/ai-fication-kit/perform-feature-add-simulation
Clone the repo
git clone --depth 1 https://github.com/kunalsuri/ai-fication-kit

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 perform-feature-add-simulation

README.md
[![agentmods](https://agentmods.dev/badge/rules/kunalsuri/ai-fication-kit/perform-feature-add-simulation.svg)](https://agentmods.dev/rules/kunalsuri/ai-fication-kit/perform-feature-add-simulation)
Your own site
<a href="https://agentmods.dev/rules/kunalsuri/ai-fication-kit/perform-feature-add-simulation"><img src="https://agentmods.dev/badge/rules/kunalsuri/ai-fication-kit/perform-feature-add-simulation.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 278 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 5.1 $0.00023 $0.00278
Opus 5 $0.00012 $0.00139
Sonnet 5 $0.00005 $0.00056
Haiku 4.5 $0.00002 $0.00028

Measured 5d ago against content hash d4f9932ee4bb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

perform-feature-add-simulation 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 5d 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/perform-feature-add-simulation.mdc · 24 lines

What it actually says

Simulate adding the feature the user names — WITHOUT writing a single line of code. This is a pre-flight check of both the plan and the knowledge layer.

Phases to walk (score each: smooth / friction / blocked)

  1. Locate — can MODULE_MAP + FEATURE_MAP/CATALOG identify the target modules without crawling? Name them.
  2. Plan — draft the touch list per layer; note Stability of every file you'd change. Any frozen or ? file ⇒ blocked pending human approval.
  3. Verify — which suites would prove it works; do they exist and are commands confirmed?
  4. Knowledge update — which ai/ files would need updating after the change?

Output

A friction report in chat (and, if asked, saved to ai/analysis/audit-reports/): per-phase score with the specific missing knowledge that caused friction, total estimated context cost, and a go / no-go recommendation. Knowledge gaps found here are the cheapest bugs you will ever fix — file each as an audit TODO.

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. 5d ago First seen · 24 lines · 23 tokens per session scan A d4f9932ee4bb

Subscribe to this mod's changes

perform-feature-add-simulation is a cursor rule published in the GitHub repository kunalsuri/ai-fication-kit (3 stars, last pushed 2d ago), licensed Apache-2.0. It adds 23 tokens to every session and 278 once invoked, about $0.0001 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.