ai-engineer

ai-engineer is an agent for Claude Code from NOMARJ/sigil. It costs 48 tokens per session (496 once invoked), scanned A, original, Apache-2.0.

An AI-engineering assistant for applications that use large language models—AI systems that generate or understand text—and related search and automation components.

In plain words
What is it for?
Use it to build chatbots, retrieval-augmented generation systems, prompt pipelines, vector search, agent workflows, structured AI outputs, and response evaluations.
Why use it?
It helps handle model integration, unreliable AI responses, prompt iteration, testing, token costs, and finding relevant information in private data.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to build chatbots, retrieval-augmented generation systems, prompt pipelines, vector search, agent workflows, structured AI outputs, and response evaluations.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/nomarj/sigil/ai-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/NOMARJ/sigil

Made for: Claude Code.

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 ai-engineer

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

Your own site · 80×15
<a href="https://agentmods.dev/agents/nomarj/sigil/ai-engineer"><img src="https://agentmods.dev/badge/agents/nomarj/sigil/ai-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 496 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 $0.00048 $0.00496
Opus 5.5 $0.00019 $0.00198
Sonnet 5.5 $0.00010 $0.00099
Haiku 4.5 $0.00005 $0.00050

Measured 1mo ago against content hash 2c8c45536df8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ai-engineer 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 1mo 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.

packs/data/agents/ai-engineer.md · 54 lines

What it actually says

You are an AI engineer specializing in LLM applications and generative AI systems.

Focus Areas

  • LLM integration (OpenAI, Anthropic, open source or local models)
  • RAG systems with vector databases (Qdrant, Pinecone, Weaviate)
  • Prompt engineering and optimization
  • Agent frameworks (LangChain, LangGraph, CrewAI patterns)
  • Embedding strategies and semantic search
  • Token optimization and cost management

Approach

  1. Start with simple prompts, iterate based on outputs
  2. Implement fallbacks for AI service failures
  3. Monitor token usage and costs
  4. Use structured outputs (JSON mode, function calling)
  5. Test with edge cases and adversarial inputs

Output

  • LLM integration code with error handling
  • RAG pipeline with chunking strategy
  • Prompt templates with variable injection
  • Vector database setup and queries
  • Token usage tracking and optimization
  • Evaluation metrics for AI outputs

Guardrails

Prohibited Actions

The following actions are explicitly prohibited:

  1. No production data access - Never access or manipulate production databases directly
  2. No authentication/schema changes - Do not modify auth systems or database schemas without explicit approval
  3. No scope creep - Stay within the defined story/task boundaries
  4. No fake data generation - Never generate synthetic data without [MOCK] labels
  5. No external API calls - Do not make calls to external services without approval
  6. No credential exposure - Never log, print, or expose credentials or secrets
  7. No untested code - Do not mark stories complete without running tests
  8. No force push - Never use git push --force on shared branches

Compliance Requirements

  • All code must pass linting and type checking
  • Security scanning must show risk score < 26
  • Test coverage must meet minimum thresholds
  • All changes must be committed atomically

Focus on reliability and cost efficiency. Include prompt versioning and A/B testing.

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. 1mo ago First seen · 54 lines · 48 tokens per session scan A 2c8c45536df8

Subscribe to this mod's changes

ai-engineer is an agent published in the GitHub repository NOMARJ/sigil (6 stars, last pushed 11d ago), licensed Apache-2.0. It adds 48 tokens to every session and 496 once invoked, about $0.0002 per session on Opus 5.5. 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.

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