Access to FPF Library

First Principles
Framework.

FPF Library brings together the First Principles Framework project's own publications. Use their methods for engineering decisions, research, management and coordinated human/AI work.

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Search syntax and examples

By default, all meaningful words must match the same source passage, in its text or titles. Matching ignores letter case. Ordinary word queries skip common English function words such as the, and and or; quotes keep a phrase, and uppercase operators control matching.

Example	What it does
`controlled variation`	Requires both meaningful words; their order may differ.
`"controlled variation"`	Requires adjacent words in that order.
`SYSE.24:4`	Prioritizes the exact named section. Pattern IDs also work.
`engineering OR management`	Matches either alternative. Write OR and AND in uppercase.
`engineering AND (research OR management)`	Requires engineering together with either grouped alternative.
`engineering -management`	Excludes passages that match management.
`title:"controlled variation"` `body:"controlled variation"`	Restricts the phrase to section/publication titles, or to source text. A field prefix applies to the following term or phrase.
`"controlled variation"~1`	Allows one intervening word in the phrase.
`"controlled vari"*`	Requires adjacent words, with the last word as a prefix.
`engineering^2 OR management`	Gives engineering matches more ranking weight.

The Publication, Suite and Type filters narrow the same query. Results are source passages, not generated answers. Search does not translate, expand synonyms or automatically correct spelling. For a task expressed in another language, try English terms and read the context. Press / to focus the search field.

40 publications859 patterns & other named entries22345 sections31.9 MB searchable source text

What is in FPF Library?FPF Library is the collection of the First Principles Framework project's own publications: FPF Core, Domain Principle Frameworks (DPFs), their Suites, and accompanying References and usage materials.How to use the publicationsThis is the common working instruction for people and AI agents using FPF or its DPFs, including work that develops or reviews the frameworks themselves. Apply it whenever the work relies on their methods, not only when…

From the published README

What is FPF?

README on GitHub

AI-native declarative pattern languages for engineering work. FPF gives engineers and AI agents a shared, precise language for Systems, Methods, architecture, Work, evidence, verification, decisions, improvement, and communication.

Read the complete introduction

How to use FPF

Before selecting framework guidance, read and apply Using FPF and its DPF Suites. This instruction applies to project work, framework development, review and coordination. It explains how to find and read relevant content in the publications available to you, including when an interface cannot retrieve a large file.

AI-native, FPF-driven engineering work. An AI agent can retrieve relevant patterns, compare their declared situations and questions, explain them in plain technical language, expose missing evidence or authority, and help produce the next useful result.
Description and engineering of mixed human–AI work. People can use the same language to describe which System is being changed, which Method is proposed, which Work is actually performed, which capabilities are available, what is assigned or permitted, who has decision authority, what evidence supports a claim, and what would reopen a decision.

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In use · the wider ecosystem

Uses and community projects

Full selection

Reported use

Choosing what to fix in a legacy monolith

Ivan Zakutnii used an FPF-based Claude Code workflow to compare three responses to a legacy monolith: repair tests and CI, undertake a DDD refactor, or strengthen static analysis.

Ivan Zakutnii · Full annotation

Published integration

VibeVM

VibeVM packages FPF as an installable, versioned dependency through vibe install ai.lev/fpf.

Oleg Chirukhin and the VibeVM project · Full annotation

Published integration

FPF-agent

FPF-agent provides a task-oriented assistant for Claude Code and Codex.

Vitaly Pokrovskiy · Full annotation

Prototype

Backend Programming Principle Framework

The Backend Programming Principle Framework is a third-party DPF draft for recurring backend questions: service promises, state ownership, idempotent effects, failures and retries, and observability as evidence.

Ilyas Landikov · Full annotation

Find your starting point

Explore FPF Library

All publications

Reference

Engineering DPF Suite Reference

Find a method for your working question, and see how methods from different fields contribute to one decision.

226 sections

FPF

First Principles Framework (FPF) - Core Conceptual Specification

A standards-style pattern language for turning difficult engineering, research, management, and mixed human/AI work into explicit, reviewable, improvable reasoning.

356 patterns & other named entries · 9444 sections

Reference

Foundational Thinking DPF Suite Reference

Find the mathematical, physical, computational, modeling or notational contribution your question needs, and understand how the contributions work together.

31 sections

DPF

Checklist Principles Framework

Skilled work can fail through a small omission, a forgotten conversation or an answer that outlives its grounds. More documentation can make that worse when it hides the question, interrupts useful work or rewards…

6 patterns & other named entries · 132 sections

DPF

Community Building Principles Framework

Community Building concerns the deliberate creation, support and renewal of useful participation, relationships and shared ways of working. Its wider cultural purpose can also be served by people who learn and use a…

16 patterns & other named entries · 439 sections

DPF