prompt-optimizer

prompt-optimizer is a cursor rule for Cursor from mohitagw15856/pm-claude-skills. It costs 82 tokens per session (908 once invoked), scanned A, original, MIT.

A method for diagnosing and rewriting an underperforming prompt, the instructions given to an AI model. It turns vague failures such as inconsistent answers or bad formatting into specific changes that can be tested.

In plain words
What is it for?
Use it to improve prompts that produce unreliable, incorrect, poorly formatted, overly long, or refused responses.
Why use it?
A prompt may fail because the task, expected format, examples, or source information is unclear. This helps fix the underlying instruction instead of repeatedly tweaking it at random.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit Use it to improve prompts that produce unreliable, incorrect, poorly formatted, overly long, or refused responses.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/mohitagw15856/pm-claude-skills/prompt-optimizer
About the project

PM Skills is a collection of plain-Markdown instructions that teach AI assistants structured methods for handling professional, personal, and life-admin tasks. People use it with Claude, ChatGPT, Gemini, Cursor, Codex, and other supported agents for work such as writing product requirements, reviewing documents, or planning difficult situations.

mohitagw15856/pm-claude-skills · 1,352 stars · on GitHub · mohitagw15856.github.io

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/mohitagw15856/pm-claude-skills

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 prompt-optimizer

README.md
[![agentmods](https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/prompt-optimizer/github.svg)](https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/prompt-optimizer)
Your own site
<a href="https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/prompt-optimizer"><img src="https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/prompt-optimizer/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 prompt-optimizer

Your own site · 80×15
<a href="https://agentmods.dev/rules/mohitagw15856/pm-claude-skills/prompt-optimizer"><img src="https://agentmods.dev/badge/rules/mohitagw15856/pm-claude-skills/prompt-optimizer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 908 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 $0.00082 $0.00908
Opus 5 $0.00041 $0.00454
Sonnet 5 $0.00016 $0.00182
Haiku 4.5 $0.00008 $0.00091

Measured 7d ago against content hash fec45bfb4622, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

prompt-optimizer 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.

exports/cursor/pm-ai/prompt-optimizer/prompt-optimizer.mdc · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Prompt Optimizer Skill

A weak prompt fails in patterned ways — vague task, no output contract, buried instructions, no examples, or asking for judgement with nothing to ground it. This skill diagnoses which failure mode is in play and rewrites the prompt to fix it, then hands you a way to check the fix held — so "it's flaky" becomes a specific, testable change rather than another round of fiddling.

Working from a brief

You'll often get just the prompt and a vague "it's not working". Always deliver a full rewrite anyway — infer the intended task and output from the prompt's wording, state your assumptions, and rewrite. If the failing behaviour wasn't described, infer the most likely failure mode from the prompt's structure and say so. Never hand back only a critique with no rewritten prompt.

Required Inputs

Ask for these only if they aren't already provided (else infer and label):

  • The current prompt — the exact text being used.
  • What's going wrong — wrong answers, inconsistent format, refusals, too long/short, hallucinated facts.
  • The desired output — what a perfect response looks like (a sample is ideal).
  • Context — the model/runtime, whether it's one-shot or part of a chain, and any hard constraints (length, JSON, latency).

Output Format

Prompt Diagnosis & Rewrite

1. Diagnosis — the specific failure mode(s), each tied to the line that causes it:

Symptom Likely cause Fix applied
Inconsistent format no explicit output contract added a schema + example
Hallucinated details asked to answer without grounding added "use only the provided context; say what's unknown"
Ignores an instruction buried mid-paragraph moved to a numbered rule near the top

2. Rewritten prompt — the full new prompt in a fenced block, ready to paste. Apply the levers that fit: role + task in the first lines, an explicit output contract (structure/schema + a short example), grounding rules ("answer only from X; if unknown, say so"), constraints stated as rules not prose, and 1–3 few-shot examples when the task needs a demonstrated pattern.

Read the full file on GitHub · 72 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 · 72 lines · 82 tokens per session scan A fec45bfb4622

Subscribe to this mod's changes

prompt-optimizer is a cursor rule published in the GitHub repository mohitagw15856/pm-claude-skills (1,352 stars, last pushed 2d ago), licensed MIT. It adds 82 tokens to every session and 908 once invoked, about $0.0004 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 2026-09-03.