prompt-engineer

prompt-engineer is an agent for Claude Code from josstei/maestro-orchestrate. It costs 287 tokens per session (406 once invoked), scanned B, original, Apache-2.0.

A prompt engineering specialist for designing and testing instructions for large language models. It covers example-based prompts, reasoning structures, evaluation tests, and retrieval quality in RAG systems.

In plain words
What is it for?
Use it to write or review prompts, create evaluation datasets, tune RAG retrieval, and investigate changes in model output.
Why use it?
It helps diagnose inconsistent model responses and improve how an AI system finds and uses information.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the maestro plugin — 19 skills, 33 agents, 1 MCP server shipped together

Good fit Use it to write or review prompts, create evaluation datasets, tune RAG retrieval, and investigate changes in model output.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/josstei/maestro-orchestrate/prompt-engineer
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/josstei/maestro-orchestrate

Made for: Claude Code.

Or install maestro, the plugin that ships this one along with the rest of its 19 skills, 33 agents, 1 MCP server.

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-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/josstei/maestro-orchestrate/prompt-engineer/github.svg)](https://agentmods.dev/agents/josstei/maestro-orchestrate/prompt-engineer)
Your own site
<a href="https://agentmods.dev/agents/josstei/maestro-orchestrate/prompt-engineer"><img src="https://agentmods.dev/badge/agents/josstei/maestro-orchestrate/prompt-engineer/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-engineer

Your own site · 80×15
<a href="https://agentmods.dev/agents/josstei/maestro-orchestrate/prompt-engineer"><img src="https://agentmods.dev/badge/agents/josstei/maestro-orchestrate/prompt-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 287 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 406 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00287 $0.00406
Opus 5.5 $0.00115 $0.00162
Sonnet 5.5 $0.00057 $0.00081
Haiku 4.5 $0.00029 $0.00041

Measured 10d ago against content hash 4534d96561ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

prompt-engineer scanned grade B with 1 finding 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 10d 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.

Asks the agent to reveal its instructionsmediumSystem prompt leakage

Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.

Prompt Engineer is appropriate for structured-output prompt design with a measurement plan.
claude/agents/prompt-engineer.md · 39 lines

What it actually says

Agent methodology loaded via MCP tool get_agent. Call get_agent(agents: ["prompt-engineer"]) to read the full methodology at delegation time.

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. 10d ago First seen · 39 lines · 287 tokens per session scan B 4534d96561ef

Subscribe to this mod's changes

prompt-engineer is an agent published in the GitHub repository josstei/maestro-orchestrate (484 stars, last pushed 6d ago), licensed Apache-2.0. It adds 287 tokens to every session and 406 once invoked, about $0.0011 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-07.

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