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Harnessing AI Agents for Engineering Applications
Integrating HITL, Claude Code, PRP, and the Wiggum Technique
13 hours ago
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AI-driven software engineering, agent harnesses have emerged as powerful frameworks that enable large language models (LLMs) to perform complex, multi-step tasks autonomously while incorporating human oversight.

These harnesses act as structured environments where AI agents can plan, execute, and iterate on tasks, particularly in engineering applications like code generation, debugging, and system design.

A key component of effective agent harnesses is Human-in-the-Loop (HITL), which introduces strategic human intervention to ensure accuracy, compliance, and ethical alignment in AI workflows.

This article explores the integration of LLMs, agents, and harnesses in engineering contexts, with a focus on Anthropic's Claude Code as the core tool. We'll delve into scripting and prompt engineering, highlighting the Product Requirements Prompt (PRP) framework for handling research, requirements gathering, and blueprinting, before passing control to the "Wiggum" technique—an autonomous looping method that processes these prompts efficiently.

By combining these elements, developers can build robust engineering applications that balance AI autonomy with human control.

 

Understanding LLMs, Agents, and Harnesses in Engineering

At the heart of modern AI engineering is the LLM, such as Anthropic's Claude, which powers natural language understanding, code generation, and reasoning.

LLMs excel at interpreting user intents and producing outputs like code snippets, but they shine when embedded in agents—autonomous systems that use tools, memory, and planning to achieve goals. An agent might, for instance, research a problem, generate requirements, blueprint a solution, and iterate on code.

To manage these agents effectively, especially for long running or complex engineering tasks, developers use harnesses. These are runtime environments that provide structure, such as tool-calling loops, prompt caching, and HITL checkpoints.

In engineering apps, harnesses ensure agents can handle multi-context workflows, like maintaining state across sessions or pausing for human approval before critical actions (e.g., deploying code or accessing sensitive data).

HITL is crucial here: it pauses agent execution at predefined points, allowing humans to review outputs, modify plans, or approve actions. This is especially vital in engineering, where errors could lead to faulty software or security risks. For example, an agent might flag ambiguous requirements for human clarification before proceeding.

 

Claude Code: The Foundation for Agentic Engineering

Claude Code, Anthropic's terminal-based agentic coding tool, exemplifies how LLMs can be harnessed for engineering tasks.

Unlike traditional code assistants that require constant user input, Claude Code operates as an autonomous agent in your development environment. It can build features from descriptions, debug issues, navigate codebases, and even integrate with external tools like web searches or Apis.

Key features include:

  • Context Awareness: Maintains knowledge of your entire project, pulling in relevant files and documentation.
  • Tool Usage: Executes terminal commands, edits files, and commits changes.
  • Agentic Behaviour: Plans steps, reasons through problems, and iterates without constant supervision.

In scripting, Claude Code uses prompts to guide the agent. A basic prompt might look like this:

<task>

Build a Python function to calculate Fibonacci sequences up to n, with error handling for invalid inputs.

</task>

The agent would then plan, write the code, test it, and output the result. For HITL integration, you can configure interrupts, such as pausing before file modifications for human review.

 

Incorporating PRP: From Research to Blueprints

To maximize Claude Code's effectiveness in engineering apps, structured prompting is essential. Enter the Product Requirements Prompt (PRP) framework a context engineering approach that transforms vague ideas into actionable, production-ready specifications.

PRP combines a Product Requirements Document (PRD), curated codebase intelligence, and an agent runbook to ensure the AI has all necessary context.

PRP is particularly suited for the early stages of engineering workflows:

  • Research: The agent gathers information from codebases, docs, or external sources.
  • Requirements: Defines user needs, constraints, and success criteria.
  • Blueprints: Outlines architecture, data flows, and implementation steps.

A typical PRP structure might include:

  1. PRD Section: High-level goals, user stories, and non-functional requirements (e.g., performance benchmarks).
  2. Codebase Intelligence: Summaries of existing code, dependencies, and best practices.
  3. Runbook: Step-by-step instructions for the agent, including HITL checkpoints.

Example PRP Prompt for an Engineering App:

<prp>

<prd>

Goal: Develop a REST API for user authentication in a web app.

Requirements: Support JWT tokens, handle login/logout, rate limiting.

Constraints: Use Python Flask, integrate with SQLite.

Success Criteria: API endpoints tested with 100% coverage, no security vulnerabilities.

</prd>

<codebase>

Existing: auth_utils.py with basic hashing functions.

Dependencies: flask, jwt, sqlite3.

</codebase>

<runbook>

1. Research JWT best practices.

2. Blueprint endpoints: /login, /logout.

3. Implement and test.

4. Pause for HITL review before final commit.

</runbook>

</prp>

This PRP is fed into Claude Code, where the agent researches (e.g., via web tools), refines requirements, and generates blueprints before execution.

 

Passing Off to Wiggum: Autonomous Prompt Handling

Once the PRP generates refined prompts for research, requirements, and blueprints, the workflow transitions to the "Wiggum" technique named after Ralph Wiggum from The Simpsons which automates prompt processing through an infinite loop.

Wiggum wraps Claude Code in a persistent execution cycle, allowing the agent to run autonomously until all success criteria are met, without constant human intervention.

Wiggum handles PRP outputs by:

  • Reading the current state (e.g., from files like IMPLEMENTATION_PLAN.md).
  • Executing the next task.
  • Verifying against criteria.
  • Looping if incomplete, self-correcting errors.

Scripting Wiggum involves a simple loop in a shell script or plugin:

bash

while true; do

  claude code --prompt "$(cat prp_output.md)" --check-criteria

  if [criteria_met]; then break; fi

done

This enables "night shift" coding: Start a task, let Wiggum run overnight, and wake up to completed work.

HITL can be integrated by adding pauses at loop boundaries, such as after major milestones.

 

Benefits and Best Practices for Engineering Apps

This pipeline LLM powered agents in harnesses, PRP for upfront structuring, and Wiggum for execution accelerates engineering apps by reducing debugging cycles and enabling scalable automation.

Benefits include 50-90% efficiency gains, production-ready code on first passes, and seamless HITL for oversight.

Best practices:

  • Prompt Refinement: Use XML-like tags in PRP for clarity.
  • Validation Loops: In Wiggum, include self-tests to minimize loops.
  • HITL Placement: Interrupt on high-risk actions, like deployments.
  • Scalability: Start small; scale to multi-agent setups.

As AI evolves, this approach positions engineers to build more reliably and creatively, blending machine efficiency with human insight.

Want more help intergrating AI systems into your business?

Reach out to us today!

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Atlas vs. Comet: Overview

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Feature

Atlas (OpenAI)

Comet (Perplexity)

Core Philosophy

Task automation ("Let me do that for you")

Research and understanding ("Let me help you learn")

AI Engine

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Perplexity AI, context-rich research workflows

Launch Date

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October 2, 2025

Platform

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Chromium (Windows, Mac), supports Chrome extensions

Pricing

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Free + Plus (subscription for advanced features)

Quick Links

To get started testing Perplexity Comet and claim $10 in free AI credits, simply click here New users get a complimentary month of Perplexity Pro, a fast way to experience AI powered browsing risk free.

 

Core Benefits

OpenAI Atlas

Seamlessly integrates ChatGPT into the browser sidebar, enabling real time dialogue with web content.

Agent Mode can automate multi-step tasks: from booking a trip, shopping, or conducting multi tab research, all via simple instructions.

Customizable context memory allows Atlas to remember browsing patterns, user interests, and session context, offering enhanced personalization.

Suitable for action-oriented users who want the AI to take over and execute web tasks on their behalf.

Perplexity Comet

Prioritizes deep research, synthesis, and knowledge extraction, designed for users who want to learn and understand rather than delegate.

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Every insight is actively cited, ideal for professionals and students who value transparency and need traceability in summaries.

Supports all Chrome extensions, simple one click migration from Chrome/Edge, and includes privacy controls, local data storage, and a native ad blocker.

Try Perplexity Comet today and receive $10 in free AI credits! Claim your complimentary month of Perplexity Pro, perfect for anyone eager to explore the latest AI-powered browsing experience risk-free.

 

Features Detail

Feature Category

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Not yet available for Windows or mobile platforms at launch, limiting cross-device access.

Some technical UX problems have been reported, causing inconsistent site layouts.

Comet Downsides

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Some tasks (like booking or shopping workflows) may fail or loop, and AI may struggle with ambiguous instructions.


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Get your FREE Comet Browser

In the crowded landscape of web browsers, Comet stands out as the next evolution—an AI-native browser built by Perplexity that reimagines what it means to browse the internet. Unlike conventional browsers that simply help you navigate tabs and bookmarks, Comet brings true intelligence and functionality through deeply integrated AI-powered functions, changing passive browsing into active problem solving and productivity.

1. Native AI Integration: The Heart of Comet

Comet’s core architecture is built on the Chromium framework, ensuring speed and compatibility familiar to Chrome users, while transforming every aspect of browser interaction with artificial intelligence. Instead of AI being an optional add-on, every session and workflow includes native AI capabilities: Perplexity’s advanced models (Sonar, R1) and top external language models (GPT-5, Claude 4, Gemini Pro) are woven directly into the browser’s fabric.​

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  • Contextual AI assistant: Summarizes page content, answers questions, explains difficult concepts, and keeps you focused while you browse, learn, and work.​

  • Real-time task execution: Ask Comet to research, compare, and even initiate actions (like booking flights or making purchases), while you supervise the outcome.​

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2. Automated Browser Workflows

Comet Assistant isn’t just a chatbot—it’s an embedded agent capable of automating and executing complex workflows:

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  • Summarize emails and calendar events: Stay on top of communication without reading everything manually—Comet scans your inbox and events, surfacing the most important details.​

  • Navigate and interact with websites: Complete forms, perform multi-step searches, and even shop or book travel just by telling Comet what you need—it carries out the process, saving you time and energy.​

  • Interpret direct natural language commands: Get answers to research queries, compare product and travel options, or execute workflow tasks simply by typing requests in plain English.​

3. Use Cases: How Comet Changes the Game

Comet isn’t just about browsing smarter—it’s about elevating everything you do online. Real-world use cases include:

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  • Project & Learning Assistant: Create study plans from syllabuses, explain technical topics, or act as a context-sensitive tutor who adapts explanations to your current reading level.​

  • Email and Calendar Management: Automate replies, scheduling, and information extraction from large volumes of messages.​

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  • Developer Opportunities: Native AI API gives developers a canvas for intelligent web apps that leverage Comet’s automation for richer, smarter experiences.​

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4. Privacy, Safety & Performance

  • Privacy-focused: Comet applies strong privacy protections for query analysis and browsing patterns, keeping sensitive information secure while enabling useful AI assistance.​

  • Hybrid processing: Local page rendering for speed, with cloud AI capabilities for heavy lifting—delivering both responsiveness and scalability.​

  • Available to all: Free for basic users with advanced features for subscribers, and easy installation across platforms.​

5. Why Download and Use Comet Browser?

  • Supercharges productivity: Transforms research, learning, shopping, personal organization, and multitasking with instant, intelligent automation.

  • Reduces friction: Moves you from manual browsing to assisted cognition—every task gets easier, every result more relevant, and every session more focused.

  • Adapts to your needs: Whether you’re a developer, professional, student, or everyday user, Comet’s flexible architecture supports everything from casual browsing to heavy multitasking.

  • Personalized AI experience: The more you use Comet, the smarter and more indispensable it becomes, learning how you think and what helps you most.​

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Comet Browser is the front-runner in the next generation of AI-powered web browsers. It’s more than a tool—it’s a personal assistant, a researcher, a teacher, an organizer, and a workflow engine, all built into your browser window. If you’re ready to take your internet experience from passive navigation to active cognition and genuine productivity, Comet deserves to be your new browser of choice.

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Claude Code Now Available on the Web
with Enhanced Sandboxing That Sets a New Standard

Anthropic has taken a significant step forward with Claude Code, its once-command-line-only agentic AI coding assistant, by launching dedicated web and mobile interfaces. The update is not just about convenience—under the hood, Claude Code now introduces an advanced sandboxing environment, fundamentally enhancing both the user workflow and security posture surrounding automated, agent-driven coding.

Web and Mobile Rollout

Previously, Claude Code operated as a CLI tool favored by developers seeking AI-driven code suggestions, automation, and multi-step task execution. With the new update, developers can access Claude Code directly from a web browser, offering a familiar and visual interface. The launch also introduces a mobile app, although for now, it’s limited to iOS users and remains in an early-access stage.

A noteworthy feature is the ability to connect Claude Code to a GitHub repository. Developers can provide high-level instructions—such as “add real-time inventory tracking to the dashboard”—and Claude Code handles the rest, running tasks, providing progress updates, and even allowing for mid-process feedback or correction without having to restart the session. This capability supersedes the previous limitation, where developers often had to abort and restart tasks if mistakes or omissions were spotted mid-execution. Multiple coding sessions can run concurrently, each accessible from a left-hand navigation panel, supporting more parallel workflows and context switching.

The Power of Sandboxing

Where this release stands out is Anthropic’s novel sandboxing runtime. Traditionally, agentic coding tools like Claude Code requested permission for each significant action, seeking user approval step by step—a mechanism designed to prevent unintentional changes or malicious exploitation, including prompt injection. While secure, this approach led to workflow slowdowns and repetitive interruptions.

The new sandboxing model allows developers to specify up-front which folders and servers Claude Code can access. With these permissions set, the bot can independently execute its actions within those constraints, greatly reducing the frequency of user prompts. Anthropic’s new system also offers advanced network isolation: all outgoing Internet traffic from Claude Code is routed through a proxy outside the sandbox, restricting the agent’s online reach and requiring user consent before communicating with new domains. Developers can fully customize the rules dictating allowed connections, striking a balance between autonomy and control.

This means Claude Code can fetch dependencies—like npm packages—from trusted sources without granting it open, unsupervised Internet access. Not only does this streamline development, but it also dramatically minimizes risks from prompt injection attacks, careless code modifications, or data exfiltration.

Trade-Offs and Workflow Evolution

While the reduction in micro-approvals brings obvious convenience, it shifts some security responsibility back to the developer. The earlier approach, requiring granular approval, ensured that every code change and network access was reviewed. With sandboxing and broader permissions, it becomes even more critical for teams to conduct thorough code reviews, as subtle or flawed changes may slip through during more autonomous agent operations.

Despite these challenges, the new workflow will appeal to teams needing rapid iteration and bulk process automation, where detailed oversight of every AI-generated step would be a hindrance rather than a help.

Availability and Forward-Looking Impact

These new features are now live in beta as part of a research preview, available to subscribers on the Claude Pro or Max plans. Anthropic’s move is seen as a major stride forward—not just for their product, but for the broader adoption and responsible deployment of agentic coding tools in both enterprise and open-source environments.

With Claude Code’s web version and advanced sandboxing, the future of automated software development promises greater flexibility and productivity—but also demands new standards for safe, accountable, and auditable AI collaboration in codebases.

Anthropic’s demo video for Claude Code on the web.

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