paoloap wrote companion code for a Medium article on agent harnesses, including five layers: execution boundary, sandboxing, memory persistence, verification loops, and context pipelines, each with failure and guard scripts running alongside.
Move enforcement out of system prompts to deterministic code; a rule like "never delete without human approval" becomes a pre-execution hook denying the call, not a sentence the model might forget.Every demo runs with no API key; the model is replaced by a ~40-line scripted stand-in that emits a fixed sequence of tool calls, making each failure reproducible and the CI suite able to assert behaviour rather than smoke-test it. A single dependency-free `harness.py` can be dropped into any existing agent loop to add boundary checks, path allowlists, hostname allowlists, a persistent store, read-only review, dry-run, and token-cost distillation.
- `boundary()` detects coroutine functions and awaits them, fixing a silent no-op that made the guard a no-op on the most common (async) agent loops
- `host_allowlist` compares the parsed hostname, so `api.openai.com.evil.com` and `evil.com/?x=api.openai.com` are both refused
- `Denied` subclasses `str` so it drops into the same slot a tool result occupies, keeping existing loops unchanged
- `boundary(rules, max_repeats=3)` detects identical consecutive denials and changes the message to break a deterministic deadlock at full token cost
- The repo is MIT-licensed, Python 3.8+, and has no external dependencies
Move enforcement out of system prompts to deterministic code; a rule like "never delete without human approval" becomes a pre-execution hook denying the call, not a sentence the model might forget.Every demo runs with no API key; the model is replaced by a ~40-line scripted stand-in that emits a fixed sequence of tool calls, making each failure reproducible and the CI suite able to assert behaviour rather than smoke-test it. A single dependency-free `harness.py` can be dropped into any existing agent loop to add boundary checks, path allowlists, hostname allowlists, a persistent store, read-only review, dry-run, and token-cost distillation.
- `boundary()` detects coroutine functions and awaits them, fixing a silent no-op that made the guard a no-op on the most common (async) agent loops
- `host_allowlist` compares the parsed hostname, so `api.openai.com.evil.com` and `evil.com/?x=api.openai.com` are both refused
- `Denied` subclasses `str` so it drops into the same slot a tool result occupies, keeping existing loops unchanged
- `boundary(rules, max_repeats=3)` detects identical consecutive denials and changes the message to break a deterministic deadlock at full token cost
- The repo is MIT-licensed, Python 3.8+, and has no external dependencies
Anurag Singh replaced five Python scripts (backup, organizer, renamer, cleaner, watchdog) with a local LLM agent, which made errors the scripts didn't (wrong directories, skipped steps, false success reports).Each of the original scripts followed explicit rules through a scheduler; the agent instead added a longer inference chain (inspect, interpret, choose a tool, build a command, execute, review) to tasks that fixed logic already described completely, while also holding a loaded model in memory between runs.
- AutomationBench scores for frontier models remain well under 20%: GPT-5.6 Sol 18.1%, GPT-5.5 12.9%, Claude Opus 4.8 15.5%, Gemini 3.5 Flash 14.5%
- Granting an LLM system-level access creates a prompt-injection vector: a malicious file on disk could carry instructions the agent interprets as commands
- Singh's proposed fix: let the agent classify and route ambiguous requests, then hand off to a validator + fixed script for the actual filesystem action
- The five original scripts covered photo backup, extension-based Downloads sorting, file renaming, app-cache clearing, and a disk-threshold alert
- AutomationBench scores for frontier models remain well under 20%: GPT-5.6 Sol 18.1%, GPT-5.5 12.9%, Claude Opus 4.8 15.5%, Gemini 3.5 Flash 14.5%
- Granting an LLM system-level access creates a prompt-injection vector: a malicious file on disk could carry instructions the agent interprets as commands
- Singh's proposed fix: let the agent classify and route ambiguous requests, then hand off to a validator + fixed script for the actual filesystem action
- The five original scripts covered photo backup, extension-based Downloads sorting, file renaming, app-cache clearing, and a disk-threshold alert
Abid Ali Awan writes that a Jupyter Notebook pipeline can turn a webpage into a lightweight LLM-powered QA engine by fetching HTML with requests, stripping noisy elements with BeautifulSoup, converting the cleaned DOM to Markdown with markdownify and ftfy, then asking an OpenAI model to answer a specific user query using only the compact Markdown, which reduces token use by removing navigation, scripts and repeated marketing text.
- Uses gpt-5.4-nano for cost-efficient answers
- Removes script, style, nav, header, footer, form, button tags and class/id names containing popup, cookie, navbar, modal, etc.
- Demonstrates queries on olostep.com home and pricing pages and saves output to ai_scraper_result.md
- Notes running costs and cites commercial alternatives such as Olostep, Firecrawl and Exa
- Uses gpt-5.4-nano for cost-efficient answers
- Removes script, style, nav, header, footer, form, button tags and class/id names containing popup, cookie, navbar, modal, etc.
- Demonstrates queries on olostep.com home and pricing pages and saves output to ai_scraper_result.md
- Notes running costs and cites commercial alternatives such as Olostep, Firecrawl and Exa
The NOOA framework provides a way to build LLM agents using standard Pythonic object-oriented patterns. By treating agents as objects, developers can map state to typed fields and capabilities to methods where docstrings serve as prompts; specifically, an ellipsis in a method body triggers the runtime for an LLM-driven execution loop.
- Includes separate packages for CLI tools, memory management, and benchmarking.
- Supports various local and hosted models via LiteLLM integration.
- Offers automated tracing with an interactive web viewer for debugging.
- Necessitates OS-level isolation to safely execute LLM-generated code.
- Includes separate packages for CLI tools, memory management, and benchmarking.
- Supports various local and hosted models via LiteLLM integration.
- Offers automated tracing with an interactive web viewer for debugging.
- Necessitates OS-level isolation to safely execute LLM-generated code.
Asif Razzaq writes that NVIDIA Labs has open-sourced NOOA, a model-agnostic Python framework designed to streamline agentic development by consolidating prompt templates, tool schemas, and state into single class structures. By treating LLM-driven actions as standard methods with docstrings serving as prompts, the framework allows developers to build autonomous workflows that can be tested, traced, and version-controlled like ordinary software.
- Achieves 82.2% on SWE-bench Verified while using roughly half the tokens required by existing open harnesses.
- Employs a "pass by reference" mechanism for live Python objects via bounded previews to conserve context window space.
- Features an optional memory subsystem that utilizes SQLite and ACT-R activation ranking for record retrieval.
- Achieves 82.2% on SWE-bench Verified while using roughly half the tokens required by existing open harnesses.
- Employs a "pass by reference" mechanism for live Python objects via bounded previews to conserve context window space.
- Features an optional memory subsystem that utilizes SQLite and ACT-R activation ranking for record retrieval.
PandasAI is a Python library that allows users to query datasets using natural language. By leveraging large language models (LLMs), it assists both technical and non-technical individuals in performing data analysis, executing complex queries, and creating visualizations through simple conversation.
- Cross-dataframe query support
- Secure Docker sandbox option
- Multiple LLM provider compatibility via LiteLLm
- Cross-dataframe query support
- Secure Docker sandbox option
- Multiple LLM provider compatibility via LiteLLm
Emmimal P Alexander writes that while prompt engineering focuses on optimizing LLM inputs, managing these templates within evolving codebases often leads to production crashes when variables are renamed or removed. To solve this, she created `promptctl`, a Python tool that applies static analysis—similar to database schema migrations—to ensure prompt variable contracts match their call sites in the codebase.
- Performs PromptDiff (detects changes), Contract Validation (checks mismatches), and Impact Analysis (traces dependencies).
- Operates strictly via AST parsing, requiring zero LLM calls or API keys.
- Detects errors that unit tests often miss by mocking away the actual string formatting step.
- Performs PromptDiff (detects changes), Contract Validation (checks mismatches), and Impact Analysis (traces dependencies).
- Operates strictly via AST parsing, requiring zero LLM calls or API keys.
- Detects errors that unit tests often miss by mocking away the actual string formatting step.
This guide provides a comprehensive walkthrough on using Google's Gemma 4 model to build autonomous AI agents through tool calling. It explores how this feature enables models to move beyond simple text generation by interacting with external APIs and systems via structured function calls.
Key topics covered in the article include:
- The mechanics of the tool calling loop, from reasoning and selection to execution and final response.
- Setting up a Python development environment using Hugging Face and necessary libraries like transformers and torch.
- Defining JSON schemas for tools to ensure precise model understanding.
- Implementing a full agent workflow by parsing function call responses and executing Python functions.
- A practical end-to-end demonstration of building a weather lookup agent.
- Managing multi-turn conversations through state management and conversation history.
- Best practices for production deployment, including argument validation, execution timeouts, and logging.
Key topics covered in the article include:
- The mechanics of the tool calling loop, from reasoning and selection to execution and final response.
- Setting up a Python development environment using Hugging Face and necessary libraries like transformers and torch.
- Defining JSON schemas for tools to ensure precise model understanding.
- Implementing a full agent workflow by parsing function call responses and executing Python functions.
- A practical end-to-end demonstration of building a weather lookup agent.
- Managing multi-turn conversations through state management and conversation history.
- Best practices for production deployment, including argument validation, execution timeouts, and logging.
The article clarifies that RAG and fine-tuning are complementary rather than competing techniques for LLM development. RAG works by retrieving external information at inference time, which enables models to access new data and provide citable answers without changing the model weights. In contrast, fine-tuning adjusts a model's internal weights to improve its behavior, such as tone or adherence to specific output formats like JSON.
- RAG provides dynamic knowledge retrieval for accuracy and traceability.
- Fine-tuning improves task performance, style, and formatting consistency.
- Combining both methods allows developers to manage both what a model knows and how it communicates.
- RAG provides dynamic knowledge retrieval for accuracy and traceability.
- Fine-tuning improves task performance, style, and formatting consistency.
- Combining both methods allows developers to manage both what a model knows and how it communicates.
An examination of the hype surrounding autonomous AI agent frameworks and why they may add unnecessary complexity to software development. The author argues that for most production use cases, structured workflows using LLM function calling are more reliable than fully autonomous agents.
- Complexity vs control in agentic systems
- Limitations of current models regarding long-term autonomy
- Advantages of explicit programming over unpredictable loops
- Complexity vs control in agentic systems
- Limitations of current models regarding long-term autonomy
- Advantages of explicit programming over unpredictable loops
