Score a prompt's quality across 8 dimensions BEFORE sending it to an expensive model. Returns a 0-80 score, an A-F grade, the per-dimension breakdown (clarity, specificity, context, constraints, output_format, role_definition, examples, cot_structure), and the weakest dimension.

USE WHEN:

• The user is workshopping a prompt and asks "is this good?" / "will this work?" / "should I add more detail?"

• The user is about to send a long or expensive prompt to GPT-4, Claude Opus, or any frontier model, especially in a batch or automation context where rework is costly.

• The user mentions iterating on a prompt that produced poor output and wants to diagnose what's missing.

• The user pastes a prompt and asks for feedback on it.

DO NOT USE WHEN:

• The user is asking you to write a prompt for them (write it yourself first, then optionally call score_prompt to verify).

• The prompt is conversational chat (this scores task-shaped prompts).

COST: Free, no API key required. Rate-limited per IP: 5/min, 10/day, 100/month. If the user exceeds the limit, the response will include a structured upgrade path with subscribe and account URLs.

LATENCY: ~2 seconds.

Rewrite a prompt to score higher on the PQS rubric, AND show before/after output comparisons so the user can see the impact. Returns the optimized prompt, the original PQS score, the optimized PQS score, and side-by-side sample outputs from a frontier model using both versions.

USE WHEN:

• The user got a low score from score_prompt and asks how to improve.

• The user explicitly asks to "improve" / "rewrite" / "fix" / "optimize" a prompt they pasted.

• The user is dissatisfied with output quality from a previous prompt and asks how to get better results.

• score_prompt returned a suggestion to invoke this tool.

DO NOT USE WHEN:

• The user just asked for a score (use score_prompt only — don't double up).

• The user wants you to write a new prompt from scratch (write it directly).

REQUIRES: A PQS API key from a Pro subscription ($19.99/month, 1,000 calls/mo, includes batch + A/B comparison). If the user has not provided one, the tool returns a clear subscription URL — pass that response to the user verbatim. Do not invent or guess API keys. There is no free trial of this tool; the user must subscribe before the first call.

COST: Counted against your Pro subscription's monthly call quota.

LATENCY: ~6-8 seconds.